unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob b03eb947dec61dda1670dadca7cc292ca326a7ab 173373 bytes (raw)
name: src/editfns.c 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
 
/* Lisp functions pertaining to editing.                 -*- coding: utf-8 -*-

Copyright (C) 1985-1987, 1989, 1993-2017 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */


#include <config.h>
#include <sys/types.h>
#include <stdio.h>

#ifdef HAVE_PWD_H
#include <pwd.h>
#include <grp.h>
#endif

#include <unistd.h>

#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif

#include "lisp.h"

/* systime.h includes <sys/time.h> which, on some systems, is required
   for <sys/resource.h>; thus systime.h must be included before
   <sys/resource.h> */
#include "systime.h"

#if defined HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif

#include <errno.h>
#include <float.h>
#include <limits.h>

#include <c-ctype.h>
#include <intprops.h>
#include <stdlib.h>
#include <strftime.h>
#include <verify.h>

#include "composite.h"
#include "intervals.h"
#include "character.h"
#include "buffer.h"
#include "coding.h"
#include "window.h"
#include "blockinput.h"

#define TM_YEAR_BASE 1900

#ifdef WINDOWSNT
extern Lisp_Object w32_get_internal_run_time (void);
#endif

static struct lisp_time lisp_time_struct (Lisp_Object, int *);
static Lisp_Object format_time_string (char const *, ptrdiff_t, struct timespec,
				       Lisp_Object, struct tm *);
static long int tm_gmtoff (struct tm *);
static int tm_diff (struct tm *, struct tm *);
static void update_buffer_properties (ptrdiff_t, ptrdiff_t);
static Lisp_Object styled_format (ptrdiff_t, Lisp_Object *, bool);

#ifndef HAVE_TM_GMTOFF
# define HAVE_TM_GMTOFF false
#endif

enum { tzeqlen = sizeof "TZ=" - 1 };

/* Time zones equivalent to current local time and to UTC, respectively.  */
static timezone_t local_tz;
static timezone_t const utc_tz = 0;

/* The cached value of Vsystem_name.  This is used only to compare it
   to Vsystem_name, so it need not be visible to the GC.  */
static Lisp_Object cached_system_name;

static void
init_and_cache_system_name (void)
{
  init_system_name ();
  cached_system_name = Vsystem_name;
}

static struct tm *
emacs_localtime_rz (timezone_t tz, time_t const *t, struct tm *tm)
{
  tm = localtime_rz (tz, t, tm);
  if (!tm && errno == ENOMEM)
    memory_full (SIZE_MAX);
  return tm;
}

static time_t
emacs_mktime_z (timezone_t tz, struct tm *tm)
{
  errno = 0;
  time_t t = mktime_z (tz, tm);
  if (t == (time_t) -1 && errno == ENOMEM)
    memory_full (SIZE_MAX);
  return t;
}

/* Allocate a timezone, signaling on failure.  */
static timezone_t
xtzalloc (char const *name)
{
  timezone_t tz = tzalloc (name);
  if (!tz)
    memory_full (SIZE_MAX);
  return tz;
}

/* Free a timezone, except do not free the time zone for local time.
   Freeing utc_tz is also a no-op.  */
static void
xtzfree (timezone_t tz)
{
  if (tz != local_tz)
    tzfree (tz);
}

/* Convert the Lisp time zone rule ZONE to a timezone_t object.
   The returned value either is 0, or is LOCAL_TZ, or is newly allocated.
   If SETTZ, set Emacs local time to the time zone rule; otherwise,
   the caller should eventually pass the returned value to xtzfree.  */
static timezone_t
tzlookup (Lisp_Object zone, bool settz)
{
  static char const tzbuf_format[] = "<%+.*"pI"d>%s%"pI"d:%02d:%02d";
  char const *trailing_tzbuf_format = tzbuf_format + sizeof "<%+.*"pI"d" - 1;
  char tzbuf[sizeof tzbuf_format + 2 * INT_STRLEN_BOUND (EMACS_INT)];
  char const *zone_string;
  timezone_t new_tz;

  if (NILP (zone))
    return local_tz;
  else if (EQ (zone, Qt))
    {
      zone_string = "UTC0";
      new_tz = utc_tz;
    }
  else
    {
      bool plain_integer = INTEGERP (zone);

      if (EQ (zone, Qwall))
	zone_string = 0;
      else if (STRINGP (zone))
	zone_string = SSDATA (ENCODE_SYSTEM (zone));
      else if (plain_integer || (CONSP (zone) && INTEGERP (XCAR (zone))
				 && CONSP (XCDR (zone))))
	{
	  Lisp_Object abbr;
	  if (!plain_integer)
	    {
	      abbr = XCAR (XCDR (zone));
	      zone = XCAR (zone);
	    }

	  EMACS_INT abszone = eabs (XINT (zone)), hour = abszone / (60 * 60);
	  int hour_remainder = abszone % (60 * 60);
	  int min = hour_remainder / 60, sec = hour_remainder % 60;

	  if (plain_integer)
	    {
	      int prec = 2;
	      EMACS_INT numzone = hour;
	      if (hour_remainder != 0)
		{
		  prec += 2, numzone = 100 * numzone + min;
		  if (sec != 0)
		    prec += 2, numzone = 100 * numzone + sec;
		}
	      sprintf (tzbuf, tzbuf_format, prec, numzone,
		       &"-"[XINT (zone) < 0], hour, min, sec);
	      zone_string = tzbuf;
	    }
	  else
	    {
	      AUTO_STRING (leading, "<");
	      AUTO_STRING_WITH_LEN (trailing, tzbuf,
				    sprintf (tzbuf, trailing_tzbuf_format,
					     &"-"[XINT (zone) < 0],
					     hour, min, sec));
	      zone_string = SSDATA (concat3 (leading, ENCODE_SYSTEM (abbr),
					     trailing));
	    }
	}
      else
	xsignal2 (Qerror, build_string ("Invalid time zone specification"),
		  zone);
      new_tz = xtzalloc (zone_string);
    }

  if (settz)
    {
      block_input ();
      emacs_setenv_TZ (zone_string);
      tzset ();
      timezone_t old_tz = local_tz;
      local_tz = new_tz;
      tzfree (old_tz);
      unblock_input ();
    }

  return new_tz;
}

void
init_editfns (bool dumping)
{
#if !defined CANNOT_DUMP
  /* A valid but unlikely setting for the TZ environment variable.
     It is OK (though a bit slower) if the user chooses this value.  */
  static char dump_tz_string[] = "TZ=UtC0";
#endif

  const char *user_name;
  register char *p;
  struct passwd *pw;	/* password entry for the current user */
  Lisp_Object tem;

  /* Set up system_name even when dumping.  */
  init_and_cache_system_name ();

#ifndef CANNOT_DUMP
  /* When just dumping out, set the time zone to a known unlikely value
     and skip the rest of this function.  */
  if (dumping)
    {
      xputenv (dump_tz_string);
      tzset ();
      return;
    }
#endif

  char *tz = getenv ("TZ");

#if !defined CANNOT_DUMP
  /* If the execution TZ happens to be the same as the dump TZ,
     change it to some other value and then change it back,
     to force the underlying implementation to reload the TZ info.
     This is needed on implementations that load TZ info from files,
     since the TZ file contents may differ between dump and execution.  */
  if (tz && strcmp (tz, &dump_tz_string[tzeqlen]) == 0)
    {
      ++*tz;
      tzset ();
      --*tz;
    }
#endif

  /* Set the time zone rule now, so that the call to putenv is done
     before multiple threads are active.  */
  tzlookup (tz ? build_string (tz) : Qwall, true);

  pw = getpwuid (getuid ());
#ifdef MSDOS
  /* We let the real user name default to "root" because that's quite
     accurate on MS-DOS and because it lets Emacs find the init file.
     (The DVX libraries override the Djgpp libraries here.)  */
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "root");
#else
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "unknown");
#endif

  /* Get the effective user name, by consulting environment variables,
     or the effective uid if those are unset.  */
  user_name = getenv ("LOGNAME");
  if (!user_name)
#ifdef WINDOWSNT
    user_name = getenv ("USERNAME");	/* it's USERNAME on NT */
#else  /* WINDOWSNT */
    user_name = getenv ("USER");
#endif /* WINDOWSNT */
  if (!user_name)
    {
      pw = getpwuid (geteuid ());
      user_name = pw ? pw->pw_name : "unknown";
    }
  Vuser_login_name = build_string (user_name);

  /* If the user name claimed in the environment vars differs from
     the real uid, use the claimed name to find the full name.  */
  tem = Fstring_equal (Vuser_login_name, Vuser_real_login_name);
  if (! NILP (tem))
    tem = Vuser_login_name;
  else
    {
      uid_t euid = geteuid ();
      tem = make_fixnum_or_float (euid);
    }
  Vuser_full_name = Fuser_full_name (tem);

  p = getenv ("NAME");
  if (p)
    Vuser_full_name = build_string (p);
  else if (NILP (Vuser_full_name))
    Vuser_full_name = build_string ("unknown");

#ifdef HAVE_SYS_UTSNAME_H
  {
    struct utsname uts;
    uname (&uts);
    Voperating_system_release = build_string (uts.release);
  }
#else
  Voperating_system_release = Qnil;
#endif
}
\f
DEFUN ("char-to-string", Fchar_to_string, Schar_to_string, 1, 1, 0,
       doc: /* Convert arg CHAR to a string containing that character.
usage: (char-to-string CHAR)  */)
  (Lisp_Object character)
{
  int c, len;
  unsigned char str[MAX_MULTIBYTE_LENGTH];

  CHECK_CHARACTER (character);
  c = XFASTINT (character);

  len = CHAR_STRING (c, str);
  return make_string_from_bytes ((char *) str, 1, len);
}

DEFUN ("byte-to-string", Fbyte_to_string, Sbyte_to_string, 1, 1, 0,
       doc: /* Convert arg BYTE to a unibyte string containing that byte.  */)
  (Lisp_Object byte)
{
  unsigned char b;
  CHECK_NUMBER (byte);
  if (XINT (byte) < 0 || XINT (byte) > 255)
    error ("Invalid byte");
  b = XINT (byte);
  return make_string_from_bytes ((char *) &b, 1, 1);
}

DEFUN ("string-to-char", Fstring_to_char, Sstring_to_char, 1, 1, 0,
       doc: /* Return the first character in STRING.  */)
  (register Lisp_Object string)
{
  register Lisp_Object val;
  CHECK_STRING (string);
  if (SCHARS (string))
    {
      if (STRING_MULTIBYTE (string))
	XSETFASTINT (val, STRING_CHAR (SDATA (string)));
      else
	XSETFASTINT (val, SREF (string, 0));
    }
  else
    XSETFASTINT (val, 0);
  return val;
}

DEFUN ("point", Fpoint, Spoint, 0, 0, 0,
       doc: /* Return value of point, as an integer.
Beginning of buffer is position (point-min).  */)
  (void)
{
  Lisp_Object temp;
  XSETFASTINT (temp, PT);
  return temp;
}

DEFUN ("point-marker", Fpoint_marker, Spoint_marker, 0, 0, 0,
       doc: /* Return value of point, as a marker object.  */)
  (void)
{
  return build_marker (current_buffer, PT, PT_BYTE);
}

DEFUN ("goto-char", Fgoto_char, Sgoto_char, 1, 1, "NGoto char: ",
       doc: /* Set point to POSITION, a number or marker.
Beginning of buffer is position (point-min), end is (point-max).

The return value is POSITION.  */)
  (register Lisp_Object position)
{
  if (MARKERP (position))
    set_point_from_marker (position);
  else if (INTEGERP (position))
    SET_PT (clip_to_bounds (BEGV, XINT (position), ZV));
  else
    wrong_type_argument (Qinteger_or_marker_p, position);
  return position;
}


/* Return the start or end position of the region.
   BEGINNINGP means return the start.
   If there is no region active, signal an error. */

static Lisp_Object
region_limit (bool beginningp)
{
  Lisp_Object m;

  if (!NILP (Vtransient_mark_mode)
      && NILP (Vmark_even_if_inactive)
      && NILP (BVAR (current_buffer, mark_active)))
    xsignal0 (Qmark_inactive);

  m = Fmarker_position (BVAR (current_buffer, mark));
  if (NILP (m))
    error ("The mark is not set now, so there is no region");

  /* Clip to the current narrowing (bug#11770).  */
  return make_number ((PT < XFASTINT (m)) == beginningp
		      ? PT
		      : clip_to_bounds (BEGV, XFASTINT (m), ZV));
}

DEFUN ("region-beginning", Fregion_beginning, Sregion_beginning, 0, 0, 0,
       doc: /* Return the integer value of point or mark, whichever is smaller.  */)
  (void)
{
  return region_limit (1);
}

DEFUN ("region-end", Fregion_end, Sregion_end, 0, 0, 0,
       doc: /* Return the integer value of point or mark, whichever is larger.  */)
  (void)
{
  return region_limit (0);
}

DEFUN ("mark-marker", Fmark_marker, Smark_marker, 0, 0, 0,
       doc: /* Return this buffer's mark, as a marker object.
Watch out!  Moving this marker changes the mark position.
If you set the marker not to point anywhere, the buffer will have no mark.  */)
  (void)
{
  return BVAR (current_buffer, mark);
}

\f
/* Find all the overlays in the current buffer that touch position POS.
   Return the number found, and store them in a vector in VEC
   of length LEN.  */

static ptrdiff_t
overlays_around (EMACS_INT pos, Lisp_Object *vec, ptrdiff_t len)
{
  Lisp_Object overlay, start, end;
  struct Lisp_Overlay *tail;
  ptrdiff_t startpos, endpos;
  ptrdiff_t idx = 0;

  for (tail = current_buffer->overlays_before; tail; tail = tail->next)
    {
      XSETMISC (overlay, tail);

      end = OVERLAY_END (overlay);
      endpos = OVERLAY_POSITION (end);
      if (endpos < pos)
	  break;
      start = OVERLAY_START (overlay);
      startpos = OVERLAY_POSITION (start);
      if (startpos <= pos)
	{
	  if (idx < len)
	    vec[idx] = overlay;
	  /* Keep counting overlays even if we can't return them all.  */
	  idx++;
	}
    }

  for (tail = current_buffer->overlays_after; tail; tail = tail->next)
    {
      XSETMISC (overlay, tail);

      start = OVERLAY_START (overlay);
      startpos = OVERLAY_POSITION (start);
      if (pos < startpos)
	break;
      end = OVERLAY_END (overlay);
      endpos = OVERLAY_POSITION (end);
      if (pos <= endpos)
	{
	  if (idx < len)
	    vec[idx] = overlay;
	  idx++;
	}
    }

  return idx;
}

DEFUN ("get-pos-property", Fget_pos_property, Sget_pos_property, 2, 3, 0,
       doc: /* Return the value of POSITION's property PROP, in OBJECT.
Almost identical to `get-char-property' except for the following difference:
Whereas `get-char-property' returns the property of the char at (i.e. right
after) POSITION, this pays attention to properties's stickiness and overlays's
advancement settings, in order to find the property of POSITION itself,
i.e. the property that a char would inherit if it were inserted
at POSITION.  */)
  (Lisp_Object position, register Lisp_Object prop, Lisp_Object object)
{
  CHECK_NUMBER_COERCE_MARKER (position);

  if (NILP (object))
    XSETBUFFER (object, current_buffer);
  else if (WINDOWP (object))
    object = XWINDOW (object)->contents;

  if (!BUFFERP (object))
    /* pos-property only makes sense in buffers right now, since strings
       have no overlays and no notion of insertion for which stickiness
       could be obeyed.  */
    return Fget_text_property (position, prop, object);
  else
    {
      EMACS_INT posn = XINT (position);
      ptrdiff_t noverlays;
      Lisp_Object *overlay_vec, tem;
      struct buffer *obuf = current_buffer;
      USE_SAFE_ALLOCA;

      set_buffer_temp (XBUFFER (object));

      /* First try with room for 40 overlays.  */
      Lisp_Object overlay_vecbuf[40];
      noverlays = ARRAYELTS (overlay_vecbuf);
      overlay_vec = overlay_vecbuf;
      noverlays = overlays_around (posn, overlay_vec, noverlays);

      /* If there are more than 40,
	 make enough space for all, and try again.  */
      if (ARRAYELTS (overlay_vecbuf) < noverlays)
	{
	  SAFE_ALLOCA_LISP (overlay_vec, noverlays);
	  noverlays = overlays_around (posn, overlay_vec, noverlays);
	}
      noverlays = sort_overlays (overlay_vec, noverlays, NULL);

      set_buffer_temp (obuf);

      /* Now check the overlays in order of decreasing priority.  */
      while (--noverlays >= 0)
	{
	  Lisp_Object ol = overlay_vec[noverlays];
	  tem = Foverlay_get (ol, prop);
	  if (!NILP (tem))
	    {
	      /* Check the overlay is indeed active at point.  */
	      Lisp_Object start = OVERLAY_START (ol), finish = OVERLAY_END (ol);
	      if ((OVERLAY_POSITION (start) == posn
		   && XMARKER (start)->insertion_type == 1)
		  || (OVERLAY_POSITION (finish) == posn
		      && XMARKER (finish)->insertion_type == 0))
		; /* The overlay will not cover a char inserted at point.  */
	      else
		{
		  SAFE_FREE ();
		  return tem;
		}
	    }
	}
      SAFE_FREE ();

      { /* Now check the text properties.  */
	int stickiness = text_property_stickiness (prop, position, object);
	if (stickiness > 0)
	  return Fget_text_property (position, prop, object);
	else if (stickiness < 0
		 && XINT (position) > BUF_BEGV (XBUFFER (object)))
	  return Fget_text_property (make_number (XINT (position) - 1),
				     prop, object);
	else
	  return Qnil;
      }
    }
}

/* Find the field surrounding POS in *BEG and *END.  If POS is nil,
   the value of point is used instead.  If BEG or END is null,
   means don't store the beginning or end of the field.

   BEG_LIMIT and END_LIMIT serve to limit the ranged of the returned
   results; they do not effect boundary behavior.

   If MERGE_AT_BOUNDARY is non-nil, then if POS is at the very first
   position of a field, then the beginning of the previous field is
   returned instead of the beginning of POS's field (since the end of a
   field is actually also the beginning of the next input field, this
   behavior is sometimes useful).  Additionally in the MERGE_AT_BOUNDARY
   non-nil case, if two fields are separated by a field with the special
   value `boundary', and POS lies within it, then the two separated
   fields are considered to be adjacent, and POS between them, when
   finding the beginning and ending of the "merged" field.

   Either BEG or END may be 0, in which case the corresponding value
   is not stored.  */

static void
find_field (Lisp_Object pos, Lisp_Object merge_at_boundary,
	    Lisp_Object beg_limit,
	    ptrdiff_t *beg, Lisp_Object end_limit, ptrdiff_t *end)
{
  /* Fields right before and after the point.  */
  Lisp_Object before_field, after_field;
  /* True if POS counts as the start of a field.  */
  bool at_field_start = 0;
  /* True if POS counts as the end of a field.  */
  bool at_field_end = 0;

  if (NILP (pos))
    XSETFASTINT (pos, PT);
  else
    CHECK_NUMBER_COERCE_MARKER (pos);

  after_field
    = get_char_property_and_overlay (pos, Qfield, Qnil, NULL);
  before_field
    = (XFASTINT (pos) > BEGV
       ? get_char_property_and_overlay (make_number (XINT (pos) - 1),
					Qfield, Qnil, NULL)
       /* Using nil here would be a more obvious choice, but it would
          fail when the buffer starts with a non-sticky field.  */
       : after_field);

  /* See if we need to handle the case where MERGE_AT_BOUNDARY is nil
     and POS is at beginning of a field, which can also be interpreted
     as the end of the previous field.  Note that the case where if
     MERGE_AT_BOUNDARY is non-nil (see function comment) is actually the
     more natural one; then we avoid treating the beginning of a field
     specially.  */
  if (NILP (merge_at_boundary))
    {
      Lisp_Object field = Fget_pos_property (pos, Qfield, Qnil);
      if (!EQ (field, after_field))
	at_field_end = 1;
      if (!EQ (field, before_field))
	at_field_start = 1;
      if (NILP (field) && at_field_start && at_field_end)
	/* If an inserted char would have a nil field while the surrounding
	   text is non-nil, we're probably not looking at a
	   zero-length field, but instead at a non-nil field that's
	   not intended for editing (such as comint's prompts).  */
	at_field_end = at_field_start = 0;
    }

  /* Note about special `boundary' fields:

     Consider the case where the point (`.') is between the fields `x' and `y':

	xxxx.yyyy

     In this situation, if merge_at_boundary is non-nil, consider the
     `x' and `y' fields as forming one big merged field, and so the end
     of the field is the end of `y'.

     However, if `x' and `y' are separated by a special `boundary' field
     (a field with a `field' char-property of 'boundary), then ignore
     this special field when merging adjacent fields.  Here's the same
     situation, but with a `boundary' field between the `x' and `y' fields:

	xxx.BBBByyyy

     Here, if point is at the end of `x', the beginning of `y', or
     anywhere in-between (within the `boundary' field), merge all
     three fields and consider the beginning as being the beginning of
     the `x' field, and the end as being the end of the `y' field.  */

  if (beg)
    {
      if (at_field_start)
	/* POS is at the edge of a field, and we should consider it as
	   the beginning of the following field.  */
	*beg = XFASTINT (pos);
      else
	/* Find the previous field boundary.  */
	{
	  Lisp_Object p = pos;
	  if (!NILP (merge_at_boundary) && EQ (before_field, Qboundary))
	    /* Skip a `boundary' field.  */
	    p = Fprevious_single_char_property_change (p, Qfield, Qnil,
						       beg_limit);

	  p = Fprevious_single_char_property_change (p, Qfield, Qnil,
						     beg_limit);
	  *beg = NILP (p) ? BEGV : XFASTINT (p);
	}
    }

  if (end)
    {
      if (at_field_end)
	/* POS is at the edge of a field, and we should consider it as
	   the end of the previous field.  */
	*end = XFASTINT (pos);
      else
	/* Find the next field boundary.  */
	{
	  if (!NILP (merge_at_boundary) && EQ (after_field, Qboundary))
	    /* Skip a `boundary' field.  */
	    pos = Fnext_single_char_property_change (pos, Qfield, Qnil,
						     end_limit);

	  pos = Fnext_single_char_property_change (pos, Qfield, Qnil,
						   end_limit);
	  *end = NILP (pos) ? ZV : XFASTINT (pos);
	}
    }
}

\f
DEFUN ("delete-field", Fdelete_field, Sdelete_field, 0, 1, 0,
       doc: /* Delete the field surrounding POS.
A field is a region of text with the same `field' property.
If POS is nil, the value of point is used for POS.  */)
  (Lisp_Object pos)
{
  ptrdiff_t beg, end;
  find_field (pos, Qnil, Qnil, &beg, Qnil, &end);
  if (beg != end)
    del_range (beg, end);
  return Qnil;
}

DEFUN ("field-string", Ffield_string, Sfield_string, 0, 1, 0,
       doc: /* Return the contents of the field surrounding POS as a string.
A field is a region of text with the same `field' property.
If POS is nil, the value of point is used for POS.  */)
  (Lisp_Object pos)
{
  ptrdiff_t beg, end;
  find_field (pos, Qnil, Qnil, &beg, Qnil, &end);
  return make_buffer_string (beg, end, 1);
}

DEFUN ("field-string-no-properties", Ffield_string_no_properties, Sfield_string_no_properties, 0, 1, 0,
       doc: /* Return the contents of the field around POS, without text properties.
A field is a region of text with the same `field' property.
If POS is nil, the value of point is used for POS.  */)
  (Lisp_Object pos)
{
  ptrdiff_t beg, end;
  find_field (pos, Qnil, Qnil, &beg, Qnil, &end);
  return make_buffer_string (beg, end, 0);
}

DEFUN ("field-beginning", Ffield_beginning, Sfield_beginning, 0, 3, 0,
       doc: /* Return the beginning of the field surrounding POS.
A field is a region of text with the same `field' property.
If POS is nil, the value of point is used for POS.
If ESCAPE-FROM-EDGE is non-nil and POS is at the beginning of its
field, then the beginning of the *previous* field is returned.
If LIMIT is non-nil, it is a buffer position; if the beginning of the field
is before LIMIT, then LIMIT will be returned instead.  */)
  (Lisp_Object pos, Lisp_Object escape_from_edge, Lisp_Object limit)
{
  ptrdiff_t beg;
  find_field (pos, escape_from_edge, limit, &beg, Qnil, 0);
  return make_number (beg);
}

DEFUN ("field-end", Ffield_end, Sfield_end, 0, 3, 0,
       doc: /* Return the end of the field surrounding POS.
A field is a region of text with the same `field' property.
If POS is nil, the value of point is used for POS.
If ESCAPE-FROM-EDGE is non-nil and POS is at the end of its field,
then the end of the *following* field is returned.
If LIMIT is non-nil, it is a buffer position; if the end of the field
is after LIMIT, then LIMIT will be returned instead.  */)
  (Lisp_Object pos, Lisp_Object escape_from_edge, Lisp_Object limit)
{
  ptrdiff_t end;
  find_field (pos, escape_from_edge, Qnil, 0, limit, &end);
  return make_number (end);
}

DEFUN ("constrain-to-field", Fconstrain_to_field, Sconstrain_to_field, 2, 5, 0,
       doc: /* Return the position closest to NEW-POS that is in the same field as OLD-POS.
A field is a region of text with the same `field' property.

If NEW-POS is nil, then use the current point instead, and move point
to the resulting constrained position, in addition to returning that
position.

If OLD-POS is at the boundary of two fields, then the allowable
positions for NEW-POS depends on the value of the optional argument
ESCAPE-FROM-EDGE: If ESCAPE-FROM-EDGE is nil, then NEW-POS is
constrained to the field that has the same `field' char-property
as any new characters inserted at OLD-POS, whereas if ESCAPE-FROM-EDGE
is non-nil, NEW-POS is constrained to the union of the two adjacent
fields.  Additionally, if two fields are separated by another field with
the special value `boundary', then any point within this special field is
also considered to be `on the boundary'.

If the optional argument ONLY-IN-LINE is non-nil and constraining
NEW-POS would move it to a different line, NEW-POS is returned
unconstrained.  This is useful for commands that move by line, like
\\[next-line] or \\[beginning-of-line], which should generally respect field boundaries
only in the case where they can still move to the right line.

If the optional argument INHIBIT-CAPTURE-PROPERTY is non-nil, and OLD-POS has
a non-nil property of that name, then any field boundaries are ignored.

Field boundaries are not noticed if `inhibit-field-text-motion' is non-nil.  */)
  (Lisp_Object new_pos, Lisp_Object old_pos, Lisp_Object escape_from_edge,
   Lisp_Object only_in_line, Lisp_Object inhibit_capture_property)
{
  /* If non-zero, then the original point, before re-positioning.  */
  ptrdiff_t orig_point = 0;
  bool fwd;
  Lisp_Object prev_old, prev_new;

  if (NILP (new_pos))
    /* Use the current point, and afterwards, set it.  */
    {
      orig_point = PT;
      XSETFASTINT (new_pos, PT);
    }

  CHECK_NUMBER_COERCE_MARKER (new_pos);
  CHECK_NUMBER_COERCE_MARKER (old_pos);

  fwd = (XINT (new_pos) > XINT (old_pos));

  prev_old = make_number (XINT (old_pos) - 1);
  prev_new = make_number (XINT (new_pos) - 1);

  if (NILP (Vinhibit_field_text_motion)
      && !EQ (new_pos, old_pos)
      && (!NILP (Fget_char_property (new_pos, Qfield, Qnil))
          || !NILP (Fget_char_property (old_pos, Qfield, Qnil))
          /* To recognize field boundaries, we must also look at the
             previous positions; we could use `Fget_pos_property'
             instead, but in itself that would fail inside non-sticky
             fields (like comint prompts).  */
          || (XFASTINT (new_pos) > BEGV
              && !NILP (Fget_char_property (prev_new, Qfield, Qnil)))
          || (XFASTINT (old_pos) > BEGV
              && !NILP (Fget_char_property (prev_old, Qfield, Qnil))))
      && (NILP (inhibit_capture_property)
          /* Field boundaries are again a problem; but now we must
             decide the case exactly, so we need to call
             `get_pos_property' as well.  */
          || (NILP (Fget_pos_property (old_pos, inhibit_capture_property, Qnil))
              && (XFASTINT (old_pos) <= BEGV
                  || NILP (Fget_char_property
			   (old_pos, inhibit_capture_property, Qnil))
                  || NILP (Fget_char_property
			   (prev_old, inhibit_capture_property, Qnil))))))
    /* It is possible that NEW_POS is not within the same field as
       OLD_POS; try to move NEW_POS so that it is.  */
    {
      ptrdiff_t shortage;
      Lisp_Object field_bound;

      if (fwd)
	field_bound = Ffield_end (old_pos, escape_from_edge, new_pos);
      else
	field_bound = Ffield_beginning (old_pos, escape_from_edge, new_pos);

      if (/* See if ESCAPE_FROM_EDGE caused FIELD_BOUND to jump to the
             other side of NEW_POS, which would mean that NEW_POS is
             already acceptable, and it's not necessary to constrain it
             to FIELD_BOUND.  */
	  ((XFASTINT (field_bound) < XFASTINT (new_pos)) ? fwd : !fwd)
	  /* NEW_POS should be constrained, but only if either
	     ONLY_IN_LINE is nil (in which case any constraint is OK),
	     or NEW_POS and FIELD_BOUND are on the same line (in which
	     case the constraint is OK even if ONLY_IN_LINE is non-nil).  */
	  && (NILP (only_in_line)
	      /* This is the ONLY_IN_LINE case, check that NEW_POS and
		 FIELD_BOUND are on the same line by seeing whether
		 there's an intervening newline or not.  */
	      || (find_newline (XFASTINT (new_pos), -1,
				XFASTINT (field_bound), -1,
				fwd ? -1 : 1, &shortage, NULL, 1),
		  shortage != 0)))
	/* Constrain NEW_POS to FIELD_BOUND.  */
	new_pos = field_bound;

      if (orig_point && XFASTINT (new_pos) != orig_point)
	/* The NEW_POS argument was originally nil, so automatically set PT. */
	SET_PT (XFASTINT (new_pos));
    }

  return new_pos;
}

\f
DEFUN ("line-beginning-position",
       Fline_beginning_position, Sline_beginning_position, 0, 1, 0,
       doc: /* Return the character position of the first character on the current line.
With optional argument N, scan forward N - 1 lines first.
If the scan reaches the end of the buffer, return that position.

This function ignores text display directionality; it returns the
position of the first character in logical order, i.e. the smallest
character position on the line.

This function constrains the returned position to the current field
unless that position would be on a different line than the original,
unconstrained result.  If N is nil or 1, and a front-sticky field
starts at point, the scan stops as soon as it starts.  To ignore field
boundaries, bind `inhibit-field-text-motion' to t.

This function does not move point.  */)
  (Lisp_Object n)
{
  ptrdiff_t charpos, bytepos;

  if (NILP (n))
    XSETFASTINT (n, 1);
  else
    CHECK_NUMBER (n);

  scan_newline_from_point (XINT (n) - 1, &charpos, &bytepos);

  /* Return END constrained to the current input field.  */
  return Fconstrain_to_field (make_number (charpos), make_number (PT),
			      XINT (n) != 1 ? Qt : Qnil,
			      Qt, Qnil);
}

DEFUN ("line-end-position", Fline_end_position, Sline_end_position, 0, 1, 0,
       doc: /* Return the character position of the last character on the current line.
With argument N not nil or 1, move forward N - 1 lines first.
If scan reaches end of buffer, return that position.

This function ignores text display directionality; it returns the
position of the last character in logical order, i.e. the largest
character position on the line.

This function constrains the returned position to the current field
unless that would be on a different line than the original,
unconstrained result.  If N is nil or 1, and a rear-sticky field ends
at point, the scan stops as soon as it starts.  To ignore field
boundaries bind `inhibit-field-text-motion' to t.

This function does not move point.  */)
  (Lisp_Object n)
{
  ptrdiff_t clipped_n;
  ptrdiff_t end_pos;
  ptrdiff_t orig = PT;

  if (NILP (n))
    XSETFASTINT (n, 1);
  else
    CHECK_NUMBER (n);

  clipped_n = clip_to_bounds (PTRDIFF_MIN + 1, XINT (n), PTRDIFF_MAX);
  end_pos = find_before_next_newline (orig, 0, clipped_n - (clipped_n <= 0),
				      NULL);

  /* Return END_POS constrained to the current input field.  */
  return Fconstrain_to_field (make_number (end_pos), make_number (orig),
			      Qnil, Qt, Qnil);
}

/* Save current buffer state for `save-excursion' special form.
   We (ab)use Lisp_Misc_Save_Value to allow explicit free and so
   offload some work from GC.  */

Lisp_Object
save_excursion_save (void)
{
  return make_save_obj_obj_obj_obj
    (Fpoint_marker (),
     Qnil,
     /* Selected window if current buffer is shown in it, nil otherwise.  */
     (EQ (XWINDOW (selected_window)->contents, Fcurrent_buffer ())
      ? selected_window : Qnil),
     Qnil);
}

/* Restore saved buffer before leaving `save-excursion' special form.  */

void
save_excursion_restore (Lisp_Object info)
{
  Lisp_Object tem, tem1;

  tem = Fmarker_buffer (XSAVE_OBJECT (info, 0));
  /* If we're unwinding to top level, saved buffer may be deleted.  This
     means that all of its markers are unchained and so tem is nil.  */
  if (NILP (tem))
    goto out;

  Fset_buffer (tem);

  /* Point marker.  */
  tem = XSAVE_OBJECT (info, 0);
  Fgoto_char (tem);
  unchain_marker (XMARKER (tem));

  /* If buffer was visible in a window, and a different window was
     selected, and the old selected window is still showing this
     buffer, restore point in that window.  */
  tem = XSAVE_OBJECT (info, 2);
  if (WINDOWP (tem)
      && !EQ (tem, selected_window)
      && (tem1 = XWINDOW (tem)->contents,
	  (/* Window is live...  */
	   BUFFERP (tem1)
	   /* ...and it shows the current buffer.  */
	   && XBUFFER (tem1) == current_buffer)))
    Fset_window_point (tem, make_number (PT));

 out:

  free_misc (info);
}

DEFUN ("save-excursion", Fsave_excursion, Ssave_excursion, 0, UNEVALLED, 0,
       doc: /* Save point, and current buffer; execute BODY; restore those things.
Executes BODY just like `progn'.
The values of point and the current buffer are restored
even in case of abnormal exit (throw or error).

If you only want to save the current buffer but not point,
then just use `save-current-buffer', or even `with-current-buffer'.

Before Emacs 25.1, `save-excursion' used to save the mark state.
To save the marker state as well as the point and buffer, use
`save-mark-and-excursion'.

usage: (save-excursion &rest BODY)  */)
  (Lisp_Object args)
{
  register Lisp_Object val;
  ptrdiff_t count = SPECPDL_INDEX ();

  record_unwind_protect (save_excursion_restore, save_excursion_save ());

  val = Fprogn (args);
  return unbind_to (count, val);
}

DEFUN ("save-current-buffer", Fsave_current_buffer, Ssave_current_buffer, 0, UNEVALLED, 0,
       doc: /* Record which buffer is current; execute BODY; make that buffer current.
BODY is executed just like `progn'.
usage: (save-current-buffer &rest BODY)  */)
  (Lisp_Object args)
{
  ptrdiff_t count = SPECPDL_INDEX ();

  record_unwind_current_buffer ();
  return unbind_to (count, Fprogn (args));
}
\f
DEFUN ("buffer-size", Fbuffer_size, Sbuffer_size, 0, 1, 0,
       doc: /* Return the number of characters in the current buffer.
If BUFFER is not nil, return the number of characters in that buffer
instead.

This does not take narrowing into account; to count the number of
characters in the accessible portion of the current buffer, use
`(- (point-max) (point-min))', and to count the number of characters
in some other BUFFER, use
`(with-current-buffer BUFFER (- (point-max) (point-min)))'.  */)
  (Lisp_Object buffer)
{
  if (NILP (buffer))
    return make_number (Z - BEG);
  else
    {
      CHECK_BUFFER (buffer);
      return make_number (BUF_Z (XBUFFER (buffer))
			  - BUF_BEG (XBUFFER (buffer)));
    }
}

DEFUN ("point-min", Fpoint_min, Spoint_min, 0, 0, 0,
       doc: /* Return the minimum permissible value of point in the current buffer.
This is 1, unless narrowing (a buffer restriction) is in effect.  */)
  (void)
{
  Lisp_Object temp;
  XSETFASTINT (temp, BEGV);
  return temp;
}

DEFUN ("point-min-marker", Fpoint_min_marker, Spoint_min_marker, 0, 0, 0,
       doc: /* Return a marker to the minimum permissible value of point in this buffer.
This is the beginning, unless narrowing (a buffer restriction) is in effect.  */)
  (void)
{
  return build_marker (current_buffer, BEGV, BEGV_BYTE);
}

DEFUN ("point-max", Fpoint_max, Spoint_max, 0, 0, 0,
       doc: /* Return the maximum permissible value of point in the current buffer.
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)
is in effect, in which case it is less.  */)
  (void)
{
  Lisp_Object temp;
  XSETFASTINT (temp, ZV);
  return temp;
}

DEFUN ("point-max-marker", Fpoint_max_marker, Spoint_max_marker, 0, 0, 0,
       doc: /* Return a marker to the maximum permissible value of point in this buffer.
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)
is in effect, in which case it is less.  */)
  (void)
{
  return build_marker (current_buffer, ZV, ZV_BYTE);
}

DEFUN ("gap-position", Fgap_position, Sgap_position, 0, 0, 0,
       doc: /* Return the position of the gap, in the current buffer.
See also `gap-size'.  */)
  (void)
{
  Lisp_Object temp;
  XSETFASTINT (temp, GPT);
  return temp;
}

DEFUN ("gap-size", Fgap_size, Sgap_size, 0, 0, 0,
       doc: /* Return the size of the current buffer's gap.
See also `gap-position'.  */)
  (void)
{
  Lisp_Object temp;
  XSETFASTINT (temp, GAP_SIZE);
  return temp;
}

DEFUN ("position-bytes", Fposition_bytes, Sposition_bytes, 1, 1, 0,
       doc: /* Return the byte position for character position POSITION.
If POSITION is out of range, the value is nil.  */)
  (Lisp_Object position)
{
  CHECK_NUMBER_COERCE_MARKER (position);
  if (XINT (position) < BEG || XINT (position) > Z)
    return Qnil;
  return make_number (CHAR_TO_BYTE (XINT (position)));
}

DEFUN ("byte-to-position", Fbyte_to_position, Sbyte_to_position, 1, 1, 0,
       doc: /* Return the character position for byte position BYTEPOS.
If BYTEPOS is out of range, the value is nil.  */)
  (Lisp_Object bytepos)
{
  ptrdiff_t pos_byte;

  CHECK_NUMBER (bytepos);
  pos_byte = XINT (bytepos);
  if (pos_byte < BEG_BYTE || pos_byte > Z_BYTE)
    return Qnil;
  if (Z != Z_BYTE)
    /* There are multibyte characters in the buffer.
       The argument of BYTE_TO_CHAR must be a byte position at
       a character boundary, so search for the start of the current
       character.  */
    while (!CHAR_HEAD_P (FETCH_BYTE (pos_byte)))
      pos_byte--;
  return make_number (BYTE_TO_CHAR (pos_byte));
}
\f
DEFUN ("following-char", Ffollowing_char, Sfollowing_char, 0, 0, 0,
       doc: /* Return the character following point, as a number.
At the end of the buffer or accessible region, return 0.  */)
  (void)
{
  Lisp_Object temp;
  if (PT >= ZV)
    XSETFASTINT (temp, 0);
  else
    XSETFASTINT (temp, FETCH_CHAR (PT_BYTE));
  return temp;
}

DEFUN ("preceding-char", Fprevious_char, Sprevious_char, 0, 0, 0,
       doc: /* Return the character preceding point, as a number.
At the beginning of the buffer or accessible region, return 0.  */)
  (void)
{
  Lisp_Object temp;
  if (PT <= BEGV)
    XSETFASTINT (temp, 0);
  else if (!NILP (BVAR (current_buffer, enable_multibyte_characters)))
    {
      ptrdiff_t pos = PT_BYTE;
      DEC_POS (pos);
      XSETFASTINT (temp, FETCH_CHAR (pos));
    }
  else
    XSETFASTINT (temp, FETCH_BYTE (PT_BYTE - 1));
  return temp;
}

DEFUN ("bobp", Fbobp, Sbobp, 0, 0, 0,
       doc: /* Return t if point is at the beginning of the buffer.
If the buffer is narrowed, this means the beginning of the narrowed part.  */)
  (void)
{
  if (PT == BEGV)
    return Qt;
  return Qnil;
}

DEFUN ("eobp", Feobp, Seobp, 0, 0, 0,
       doc: /* Return t if point is at the end of the buffer.
If the buffer is narrowed, this means the end of the narrowed part.  */)
  (void)
{
  if (PT == ZV)
    return Qt;
  return Qnil;
}

DEFUN ("bolp", Fbolp, Sbolp, 0, 0, 0,
       doc: /* Return t if point is at the beginning of a line.  */)
  (void)
{
  if (PT == BEGV || FETCH_BYTE (PT_BYTE - 1) == '\n')
    return Qt;
  return Qnil;
}

DEFUN ("eolp", Feolp, Seolp, 0, 0, 0,
       doc: /* Return t if point is at the end of a line.
`End of a line' includes point being at the end of the buffer.  */)
  (void)
{
  if (PT == ZV || FETCH_BYTE (PT_BYTE) == '\n')
    return Qt;
  return Qnil;
}

DEFUN ("char-after", Fchar_after, Schar_after, 0, 1, 0,
       doc: /* Return character in current buffer at position POS.
POS is an integer or a marker and defaults to point.
If POS is out of range, the value is nil.  */)
  (Lisp_Object pos)
{
  register ptrdiff_t pos_byte;

  if (NILP (pos))
    {
      pos_byte = PT_BYTE;
      XSETFASTINT (pos, PT);
    }

  if (MARKERP (pos))
    {
      pos_byte = marker_byte_position (pos);
      if (pos_byte < BEGV_BYTE || pos_byte >= ZV_BYTE)
	return Qnil;
    }
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos);
      if (XINT (pos) < BEGV || XINT (pos) >= ZV)
	return Qnil;

      pos_byte = CHAR_TO_BYTE (XINT (pos));
    }

  return make_number (FETCH_CHAR (pos_byte));
}

DEFUN ("char-before", Fchar_before, Schar_before, 0, 1, 0,
       doc: /* Return character in current buffer preceding position POS.
POS is an integer or a marker and defaults to point.
If POS is out of range, the value is nil.  */)
  (Lisp_Object pos)
{
  register Lisp_Object val;
  register ptrdiff_t pos_byte;

  if (NILP (pos))
    {
      pos_byte = PT_BYTE;
      XSETFASTINT (pos, PT);
    }

  if (MARKERP (pos))
    {
      pos_byte = marker_byte_position (pos);

      if (pos_byte <= BEGV_BYTE || pos_byte > ZV_BYTE)
	return Qnil;
    }
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos);

      if (XINT (pos) <= BEGV || XINT (pos) > ZV)
	return Qnil;

      pos_byte = CHAR_TO_BYTE (XINT (pos));
    }

  if (!NILP (BVAR (current_buffer, enable_multibyte_characters)))
    {
      DEC_POS (pos_byte);
      XSETFASTINT (val, FETCH_CHAR (pos_byte));
    }
  else
    {
      pos_byte--;
      XSETFASTINT (val, FETCH_BYTE (pos_byte));
    }
   return val;
}
\f
DEFUN ("user-login-name", Fuser_login_name, Suser_login_name, 0, 1, 0,
       doc: /* Return the name under which the user logged in, as a string.
This is based on the effective uid, not the real uid.
Also, if the environment variables LOGNAME or USER are set,
that determines the value of this function.

If optional argument UID is an integer or a float, return the login name
of the user with that uid, or nil if there is no such user.  */)
  (Lisp_Object uid)
{
  struct passwd *pw;
  uid_t id;

  /* Set up the user name info if we didn't do it before.
     (That can happen if Emacs is dumpable
     but you decide to run `temacs -l loadup' and not dump.  */
  if (NILP (Vuser_login_name))
    init_editfns (false);

  if (NILP (uid))
    return Vuser_login_name;

  CONS_TO_INTEGER (uid, uid_t, id);
  block_input ();
  pw = getpwuid (id);
  unblock_input ();
  return (pw ? build_string (pw->pw_name) : Qnil);
}

DEFUN ("user-real-login-name", Fuser_real_login_name, Suser_real_login_name,
       0, 0, 0,
       doc: /* Return the name of the user's real uid, as a string.
This ignores the environment variables LOGNAME and USER, so it differs from
`user-login-name' when running under `su'.  */)
  (void)
{
  /* Set up the user name info if we didn't do it before.
     (That can happen if Emacs is dumpable
     but you decide to run `temacs -l loadup' and not dump.  */
  if (NILP (Vuser_login_name))
    init_editfns (false);
  return Vuser_real_login_name;
}

DEFUN ("user-uid", Fuser_uid, Suser_uid, 0, 0, 0,
       doc: /* Return the effective uid of Emacs.
Value is an integer or a float, depending on the value.  */)
  (void)
{
  uid_t euid = geteuid ();
  return make_fixnum_or_float (euid);
}

DEFUN ("user-real-uid", Fuser_real_uid, Suser_real_uid, 0, 0, 0,
       doc: /* Return the real uid of Emacs.
Value is an integer or a float, depending on the value.  */)
  (void)
{
  uid_t uid = getuid ();
  return make_fixnum_or_float (uid);
}

DEFUN ("group-gid", Fgroup_gid, Sgroup_gid, 0, 0, 0,
       doc: /* Return the effective gid of Emacs.
Value is an integer or a float, depending on the value.  */)
  (void)
{
  gid_t egid = getegid ();
  return make_fixnum_or_float (egid);
}

DEFUN ("group-real-gid", Fgroup_real_gid, Sgroup_real_gid, 0, 0, 0,
       doc: /* Return the real gid of Emacs.
Value is an integer or a float, depending on the value.  */)
  (void)
{
  gid_t gid = getgid ();
  return make_fixnum_or_float (gid);
}

DEFUN ("user-full-name", Fuser_full_name, Suser_full_name, 0, 1, 0,
       doc: /* Return the full name of the user logged in, as a string.
If the full name corresponding to Emacs's userid is not known,
return "unknown".

If optional argument UID is an integer or float, return the full name
of the user with that uid, or nil if there is no such user.
If UID is a string, return the full name of the user with that login
name, or nil if there is no such user.  */)
  (Lisp_Object uid)
{
  struct passwd *pw;
  register char *p, *q;
  Lisp_Object full;

  if (NILP (uid))
    return Vuser_full_name;
  else if (NUMBERP (uid))
    {
      uid_t u;
      CONS_TO_INTEGER (uid, uid_t, u);
      block_input ();
      pw = getpwuid (u);
      unblock_input ();
    }
  else if (STRINGP (uid))
    {
      block_input ();
      pw = getpwnam (SSDATA (uid));
      unblock_input ();
    }
  else
    error ("Invalid UID specification");

  if (!pw)
    return Qnil;

  p = USER_FULL_NAME;
  /* Chop off everything after the first comma. */
  q = strchr (p, ',');
  full = make_string (p, q ? q - p : strlen (p));

#ifdef AMPERSAND_FULL_NAME
  p = SSDATA (full);
  q = strchr (p, '&');
  /* Substitute the login name for the &, upcasing the first character.  */
  if (q)
    {
      Lisp_Object login = Fuser_login_name (make_number (pw->pw_uid));
      USE_SAFE_ALLOCA;
      char *r = SAFE_ALLOCA (strlen (p) + SBYTES (login) + 1);
      memcpy (r, p, q - p);
      char *s = lispstpcpy (&r[q - p], login);
      r[q - p] = upcase ((unsigned char) r[q - p]);
      strcpy (s, q + 1);
      full = build_string (r);
      SAFE_FREE ();
    }
#endif /* AMPERSAND_FULL_NAME */

  return full;
}

DEFUN ("system-name", Fsystem_name, Ssystem_name, 0, 0, 0,
       doc: /* Return the host name of the machine you are running on, as a string.  */)
  (void)
{
  if (EQ (Vsystem_name, cached_system_name))
    init_and_cache_system_name ();
  return Vsystem_name;
}

DEFUN ("emacs-pid", Femacs_pid, Semacs_pid, 0, 0, 0,
       doc: /* Return the process ID of Emacs, as a number.  */)
  (void)
{
  pid_t pid = getpid ();
  return make_fixnum_or_float (pid);
}

\f

#ifndef TIME_T_MIN
# define TIME_T_MIN TYPE_MINIMUM (time_t)
#endif
#ifndef TIME_T_MAX
# define TIME_T_MAX TYPE_MAXIMUM (time_t)
#endif

/* Report that a time value is out of range for Emacs.  */
void
time_overflow (void)
{
  error ("Specified time is not representable");
}

static _Noreturn void
invalid_time (void)
{
  error ("Invalid time specification");
}

/* Check a return value compatible with that of decode_time_components.  */
static void
check_time_validity (int validity)
{
  if (validity <= 0)
    {
      if (validity < 0)
	time_overflow ();
      else
	invalid_time ();
    }
}

/* Return the upper part of the time T (everything but the bottom 16 bits).  */
static EMACS_INT
hi_time (time_t t)
{
  time_t hi = t >> LO_TIME_BITS;
  if (FIXNUM_OVERFLOW_P (hi))
    time_overflow ();
  return hi;
}

/* Return the bottom bits of the time T.  */
static int
lo_time (time_t t)
{
  return t & ((1 << LO_TIME_BITS) - 1);
}

DEFUN ("current-time", Fcurrent_time, Scurrent_time, 0, 0, 0,
       doc: /* Return the current time, as the number of seconds since 1970-01-01 00:00:00.
The time is returned as a list of integers (HIGH LOW USEC PSEC).
HIGH has the most significant bits of the seconds, while LOW has the
least significant 16 bits.  USEC and PSEC are the microsecond and
picosecond counts.  */)
  (void)
{
  return make_lisp_time (current_timespec ());
}

static struct lisp_time
time_add (struct lisp_time ta, struct lisp_time tb)
{
  EMACS_INT hi = ta.hi + tb.hi;
  int lo = ta.lo + tb.lo;
  int us = ta.us + tb.us;
  int ps = ta.ps + tb.ps;
  us += (1000000 <= ps);
  ps -= (1000000 <= ps) * 1000000;
  lo += (1000000 <= us);
  us -= (1000000 <= us) * 1000000;
  hi += (1 << LO_TIME_BITS <= lo);
  lo -= (1 << LO_TIME_BITS <= lo) << LO_TIME_BITS;
  return (struct lisp_time) { hi, lo, us, ps };
}

static struct lisp_time
time_subtract (struct lisp_time ta, struct lisp_time tb)
{
  EMACS_INT hi = ta.hi - tb.hi;
  int lo = ta.lo - tb.lo;
  int us = ta.us - tb.us;
  int ps = ta.ps - tb.ps;
  us -= (ps < 0);
  ps += (ps < 0) * 1000000;
  lo -= (us < 0);
  us += (us < 0) * 1000000;
  hi -= (lo < 0);
  lo += (lo < 0) << LO_TIME_BITS;
  return (struct lisp_time) { hi, lo, us, ps };
}

static Lisp_Object
time_arith (Lisp_Object a, Lisp_Object b,
	    struct lisp_time (*op) (struct lisp_time, struct lisp_time))
{
  int alen, blen;
  struct lisp_time ta = lisp_time_struct (a, &alen);
  struct lisp_time tb = lisp_time_struct (b, &blen);
  struct lisp_time t = op (ta, tb);
  if (FIXNUM_OVERFLOW_P (t.hi))
    time_overflow ();
  Lisp_Object val = Qnil;

  switch (max (alen, blen))
    {
    default:
      val = Fcons (make_number (t.ps), val);
      FALLTHROUGH;
    case 3:
      val = Fcons (make_number (t.us), val);
      FALLTHROUGH;
    case 2:
      val = Fcons (make_number (t.lo), val);
      val = Fcons (make_number (t.hi), val);
      break;
    }

  return val;
}

DEFUN ("time-add", Ftime_add, Stime_add, 2, 2, 0,
       doc: /* Return the sum of two time values A and B, as a time value.
A nil value for either argument stands for the current time.
See `current-time-string' for the various forms of a time value.  */)
  (Lisp_Object a, Lisp_Object b)
{
  return time_arith (a, b, time_add);
}

DEFUN ("time-subtract", Ftime_subtract, Stime_subtract, 2, 2, 0,
       doc: /* Return the difference between two time values A and B, as a time value.
Use `float-time' to convert the difference into elapsed seconds.
A nil value for either argument stands for the current time.
See `current-time-string' for the various forms of a time value.  */)
  (Lisp_Object a, Lisp_Object b)
{
  return time_arith (a, b, time_subtract);
}

DEFUN ("time-less-p", Ftime_less_p, Stime_less_p, 2, 2, 0,
       doc: /* Return non-nil if time value T1 is earlier than time value T2.
A nil value for either argument stands for the current time.
See `current-time-string' for the various forms of a time value.  */)
  (Lisp_Object t1, Lisp_Object t2)
{
  int t1len, t2len;
  struct lisp_time a = lisp_time_struct (t1, &t1len);
  struct lisp_time b = lisp_time_struct (t2, &t2len);
  return ((a.hi != b.hi ? a.hi < b.hi
	   : a.lo != b.lo ? a.lo < b.lo
	   : a.us != b.us ? a.us < b.us
	   : a.ps < b.ps)
	  ? Qt : Qnil);
}


DEFUN ("get-internal-run-time", Fget_internal_run_time, Sget_internal_run_time,
       0, 0, 0,
       doc: /* Return the current run time used by Emacs.
The time is returned as a list (HIGH LOW USEC PSEC), using the same
style as (current-time).

On systems that can't determine the run time, `get-internal-run-time'
does the same thing as `current-time'.  */)
  (void)
{
#ifdef HAVE_GETRUSAGE
  struct rusage usage;
  time_t secs;
  int usecs;

  if (getrusage (RUSAGE_SELF, &usage) < 0)
    /* This shouldn't happen.  What action is appropriate?  */
    xsignal0 (Qerror);

  /* Sum up user time and system time.  */
  secs = usage.ru_utime.tv_sec + usage.ru_stime.tv_sec;
  usecs = usage.ru_utime.tv_usec + usage.ru_stime.tv_usec;
  if (usecs >= 1000000)
    {
      usecs -= 1000000;
      secs++;
    }
  return make_lisp_time (make_timespec (secs, usecs * 1000));
#else /* ! HAVE_GETRUSAGE  */
#ifdef WINDOWSNT
  return w32_get_internal_run_time ();
#else /* ! WINDOWSNT  */
  return Fcurrent_time ();
#endif /* WINDOWSNT  */
#endif /* HAVE_GETRUSAGE  */
}
\f

/* Make a Lisp list that represents the Emacs time T.  T may be an
   invalid time, with a slightly negative tv_nsec value such as
   UNKNOWN_MODTIME_NSECS; in that case, the Lisp list contains a
   correspondingly negative picosecond count.  */
Lisp_Object
make_lisp_time (struct timespec t)
{
  time_t s = t.tv_sec;
  int ns = t.tv_nsec;
  return list4i (hi_time (s), lo_time (s), ns / 1000, ns % 1000 * 1000);
}

/* Decode a Lisp list SPECIFIED_TIME that represents a time.
   Set *PHIGH, *PLOW, *PUSEC, *PPSEC to its parts; do not check their values.
   Return 2, 3, or 4 to indicate the effective length of SPECIFIED_TIME
   if successful, 0 if unsuccessful.  */
static int
disassemble_lisp_time (Lisp_Object specified_time, Lisp_Object *phigh,
		       Lisp_Object *plow, Lisp_Object *pusec,
		       Lisp_Object *ppsec)
{
  Lisp_Object high = make_number (0);
  Lisp_Object low = specified_time;
  Lisp_Object usec = make_number (0);
  Lisp_Object psec = make_number (0);
  int len = 4;

  if (CONSP (specified_time))
    {
      high = XCAR (specified_time);
      low = XCDR (specified_time);
      if (CONSP (low))
	{
	  Lisp_Object low_tail = XCDR (low);
	  low = XCAR (low);
	  if (CONSP (low_tail))
	    {
	      usec = XCAR (low_tail);
	      low_tail = XCDR (low_tail);
	      if (CONSP (low_tail))
		psec = XCAR (low_tail);
	      else
		len = 3;
	    }
	  else if (!NILP (low_tail))
	    {
	      usec = low_tail;
	      len = 3;
	    }
	  else
	    len = 2;
	}
      else
	len = 2;

      /* When combining components, require LOW to be an integer,
	 as otherwise it would be a pain to add up times.  */
      if (! INTEGERP (low))
	return 0;
    }
  else if (INTEGERP (specified_time))
    len = 2;

  *phigh = high;
  *plow = low;
  *pusec = usec;
  *ppsec = psec;
  return len;
}

/* Convert T into an Emacs time *RESULT, truncating toward minus infinity.
   Return true if T is in range, false otherwise.  */
static bool
decode_float_time (double t, struct lisp_time *result)
{
  double lo_multiplier = 1 << LO_TIME_BITS;
  double emacs_time_min = MOST_NEGATIVE_FIXNUM * lo_multiplier;
  if (! (emacs_time_min <= t && t < -emacs_time_min))
    return false;

  double small_t = t / lo_multiplier;
  EMACS_INT hi = small_t;
  double t_sans_hi = t - hi * lo_multiplier;
  int lo = t_sans_hi;
  long double fracps = (t_sans_hi - lo) * 1e12L;
#ifdef INT_FAST64_MAX
  int_fast64_t ifracps = fracps;
  int us = ifracps / 1000000;
  int ps = ifracps % 1000000;
#else
  int us = fracps / 1e6L;
  int ps = fracps - us * 1e6L;
#endif
  us -= (ps < 0);
  ps += (ps < 0) * 1000000;
  lo -= (us < 0);
  us += (us < 0) * 1000000;
  hi -= (lo < 0);
  lo += (lo < 0) << LO_TIME_BITS;
  result->hi = hi;
  result->lo = lo;
  result->us = us;
  result->ps = ps;
  return true;
}

/* From the time components HIGH, LOW, USEC and PSEC taken from a Lisp
   list, generate the corresponding time value.
   If LOW is floating point, the other components should be zero.

   If RESULT is not null, store into *RESULT the converted time.
   If *DRESULT is not null, store into *DRESULT the number of
   seconds since the start of the POSIX Epoch.

   Return 1 if successful, 0 if the components are of the
   wrong type, and -1 if the time is out of range.  */
int
decode_time_components (Lisp_Object high, Lisp_Object low, Lisp_Object usec,
			Lisp_Object psec,
			struct lisp_time *result, double *dresult)
{
  EMACS_INT hi, lo, us, ps;
  if (! (INTEGERP (high)
	 && INTEGERP (usec) && INTEGERP (psec)))
    return 0;
  if (! INTEGERP (low))
    {
      if (FLOATP (low))
	{
	  double t = XFLOAT_DATA (low);
	  if (result && ! decode_float_time (t, result))
	    return -1;
	  if (dresult)
	    *dresult = t;
	  return 1;
	}
      else if (NILP (low))
	{
	  struct timespec now = current_timespec ();
	  if (result)
	    {
	      result->hi = hi_time (now.tv_sec);
	      result->lo = lo_time (now.tv_sec);
	      result->us = now.tv_nsec / 1000;
	      result->ps = now.tv_nsec % 1000 * 1000;
	    }
	  if (dresult)
	    *dresult = now.tv_sec + now.tv_nsec / 1e9;
	  return 1;
	}
      else
	return 0;
    }

  hi = XINT (high);
  lo = XINT (low);
  us = XINT (usec);
  ps = XINT (psec);

  /* Normalize out-of-range lower-order components by carrying
     each overflow into the next higher-order component.  */
  us += ps / 1000000 - (ps % 1000000 < 0);
  lo += us / 1000000 - (us % 1000000 < 0);
  hi += lo >> LO_TIME_BITS;
  ps = ps % 1000000 + 1000000 * (ps % 1000000 < 0);
  us = us % 1000000 + 1000000 * (us % 1000000 < 0);
  lo &= (1 << LO_TIME_BITS) - 1;

  if (result)
    {
      if (FIXNUM_OVERFLOW_P (hi))
	return -1;
      result->hi = hi;
      result->lo = lo;
      result->us = us;
      result->ps = ps;
    }

  if (dresult)
    {
      double dhi = hi;
      *dresult = (us * 1e6 + ps) / 1e12 + lo + dhi * (1 << LO_TIME_BITS);
    }

  return 1;
}

struct timespec
lisp_to_timespec (struct lisp_time t)
{
  if (! ((TYPE_SIGNED (time_t) ? TIME_T_MIN >> LO_TIME_BITS <= t.hi : 0 <= t.hi)
	 && t.hi <= TIME_T_MAX >> LO_TIME_BITS))
    return invalid_timespec ();
  time_t s = (t.hi << LO_TIME_BITS) + t.lo;
  int ns = t.us * 1000 + t.ps / 1000;
  return make_timespec (s, ns);
}

/* Decode a Lisp list SPECIFIED_TIME that represents a time.
   Store its effective length into *PLEN.
   If SPECIFIED_TIME is nil, use the current time.
   Signal an error if SPECIFIED_TIME does not represent a time.  */
static struct lisp_time
lisp_time_struct (Lisp_Object specified_time, int *plen)
{
  Lisp_Object high, low, usec, psec;
  struct lisp_time t;
  int len = disassemble_lisp_time (specified_time, &high, &low, &usec, &psec);
  if (!len)
    invalid_time ();
  int val = decode_time_components (high, low, usec, psec, &t, 0);
  check_time_validity (val);
  *plen = len;
  return t;
}

/* Like lisp_time_struct, except return a struct timespec.
   Discard any low-order digits.  */
struct timespec
lisp_time_argument (Lisp_Object specified_time)
{
  int len;
  struct lisp_time lt = lisp_time_struct (specified_time, &len);
  struct timespec t = lisp_to_timespec (lt);
  if (! timespec_valid_p (t))
    time_overflow ();
  return t;
}

/* Like lisp_time_argument, except decode only the seconds part,
   and do not check the subseconds part.  */
static time_t
lisp_seconds_argument (Lisp_Object specified_time)
{
  Lisp_Object high, low, usec, psec;
  struct lisp_time t;

  int val = disassemble_lisp_time (specified_time, &high, &low, &usec, &psec);
  if (val != 0)
    {
      val = decode_time_components (high, low, make_number (0),
				    make_number (0), &t, 0);
      if (0 < val
	  && ! ((TYPE_SIGNED (time_t)
		 ? TIME_T_MIN >> LO_TIME_BITS <= t.hi
		 : 0 <= t.hi)
		&& t.hi <= TIME_T_MAX >> LO_TIME_BITS))
	val = -1;
    }
  check_time_validity (val);
  return (t.hi << LO_TIME_BITS) + t.lo;
}

DEFUN ("float-time", Ffloat_time, Sfloat_time, 0, 1, 0,
       doc: /* Return the current time, as a float number of seconds since the epoch.
If SPECIFIED-TIME is given, it is the time to convert to float
instead of the current time.  The argument should have the form
\(HIGH LOW) or (HIGH LOW USEC) or (HIGH LOW USEC PSEC).  Thus,
you can use times from `current-time' and from `file-attributes'.
SPECIFIED-TIME can also have the form (HIGH . LOW), but this is
considered obsolete.

WARNING: Since the result is floating point, it may not be exact.
If precise time stamps are required, use either `current-time',
or (if you need time as a string) `format-time-string'.  */)
  (Lisp_Object specified_time)
{
  double t;
  Lisp_Object high, low, usec, psec;
  if (! (disassemble_lisp_time (specified_time, &high, &low, &usec, &psec)
	 && decode_time_components (high, low, usec, psec, 0, &t)))
    invalid_time ();
  return make_float (t);
}

/* Write information into buffer S of size MAXSIZE, according to the
   FORMAT of length FORMAT_LEN, using time information taken from *TP.
   Use the time zone specified by TZ.
   Use NS as the number of nanoseconds in the %N directive.
   Return the number of bytes written, not including the terminating
   '\0'.  If S is NULL, nothing will be written anywhere; so to
   determine how many bytes would be written, use NULL for S and
   ((size_t) -1) for MAXSIZE.

   This function behaves like nstrftime, except it allows null
   bytes in FORMAT and it does not support nanoseconds.  */
static size_t
emacs_nmemftime (char *s, size_t maxsize, const char *format,
		 size_t format_len, const struct tm *tp, timezone_t tz, int ns)
{
  size_t total = 0;

  /* Loop through all the null-terminated strings in the format
     argument.  Normally there's just one null-terminated string, but
     there can be arbitrarily many, concatenated together, if the
     format contains '\0' bytes.  nstrftime stops at the first
     '\0' byte so we must invoke it separately for each such string.  */
  for (;;)
    {
      size_t len;
      size_t result;

      if (s)
	s[0] = '\1';

      result = nstrftime (s, maxsize, format, tp, tz, ns);

      if (s)
	{
	  if (result == 0 && s[0] != '\0')
	    return 0;
	  s += result + 1;
	}

      maxsize -= result + 1;
      total += result;
      len = strlen (format);
      if (len == format_len)
	return total;
      total++;
      format += len + 1;
      format_len -= len + 1;
    }
}

DEFUN ("format-time-string", Fformat_time_string, Sformat_time_string, 1, 3, 0,
       doc: /* Use FORMAT-STRING to format the time TIME, or now if omitted or nil.
TIME is specified as (HIGH LOW USEC PSEC), as returned by
`current-time' or `file-attributes'.  It can also be a single integer
number of seconds since the epoch.  The obsolete form (HIGH . LOW) is
also still accepted.

The optional ZONE is omitted or nil for Emacs local time, t for
Universal Time, `wall' for system wall clock time, or a string as in
the TZ environment variable.  It can also be a list (as from
`current-time-zone') or an integer (as from `decode-time') applied
without consideration for daylight saving time.

The value is a copy of FORMAT-STRING, but with certain constructs replaced
by text that describes the specified date and time in TIME:

%Y is the year, %y within the century, %C the century.
%G is the year corresponding to the ISO week, %g within the century.
%m is the numeric month.
%b and %h are the locale's abbreviated month name, %B the full name.
 (%h is not supported on MS-Windows.)
%d is the day of the month, zero-padded, %e is blank-padded.
%u is the numeric day of week from 1 (Monday) to 7, %w from 0 (Sunday) to 6.
%a is the locale's abbreviated name of the day of week, %A the full name.
%U is the week number starting on Sunday, %W starting on Monday,
 %V according to ISO 8601.
%j is the day of the year.

%H is the hour on a 24-hour clock, %I is on a 12-hour clock, %k is like %H
 only blank-padded, %l is like %I blank-padded.
%p is the locale's equivalent of either AM or PM.
%q is the calendar quarter (1–4).
%M is the minute.
%S is the second.
%N is the nanosecond, %6N the microsecond, %3N the millisecond, etc.
%Z is the time zone name, %z is the numeric form.
%s is the number of seconds since 1970-01-01 00:00:00 +0000.

%c is the locale's date and time format.
%x is the locale's "preferred" date format.
%D is like "%m/%d/%y".
%F is the ISO 8601 date format (like "%Y-%m-%d").

%R is like "%H:%M", %T is like "%H:%M:%S", %r is like "%I:%M:%S %p".
%X is the locale's "preferred" time format.

Finally, %n is a newline, %t is a tab, %% is a literal %.

Certain flags and modifiers are available with some format controls.
The flags are `_', `-', `^' and `#'.  For certain characters X,
%_X is like %X, but padded with blanks; %-X is like %X,
but without padding.  %^X is like %X, but with all textual
characters up-cased; %#X is like %X, but with letter-case of
all textual characters reversed.
%NX (where N stands for an integer) is like %X,
but takes up at least N (a number) positions.
The modifiers are `E' and `O'.  For certain characters X,
%EX is a locale's alternative version of %X;
%OX is like %X, but uses the locale's number symbols.

For example, to produce full ISO 8601 format, use "%FT%T%z".

usage: (format-time-string FORMAT-STRING &optional TIME ZONE)  */)
  (Lisp_Object format_string, Lisp_Object timeval, Lisp_Object zone)
{
  struct timespec t = lisp_time_argument (timeval);
  struct tm tm;

  CHECK_STRING (format_string);
  format_string = code_convert_string_norecord (format_string,
						Vlocale_coding_system, 1);
  return format_time_string (SSDATA (format_string), SBYTES (format_string),
			     t, zone, &tm);
}

static Lisp_Object
format_time_string (char const *format, ptrdiff_t formatlen,
		    struct timespec t, Lisp_Object zone, struct tm *tmp)
{
  char buffer[4000];
  char *buf = buffer;
  ptrdiff_t size = sizeof buffer;
  size_t len;
  int ns = t.tv_nsec;
  USE_SAFE_ALLOCA;

  timezone_t tz = tzlookup (zone, false);
  /* On some systems, like 32-bit MinGW, tv_sec of struct timespec is
     a 64-bit type, but time_t is a 32-bit type.  emacs_localtime_rz
     expects a pointer to time_t value.  */
  time_t tsec = t.tv_sec;
  tmp = emacs_localtime_rz (tz, &tsec, tmp);
  if (! tmp)
    {
      xtzfree (tz);
      time_overflow ();
    }
  synchronize_system_time_locale ();

  while (true)
    {
      buf[0] = '\1';
      len = emacs_nmemftime (buf, size, format, formatlen, tmp, tz, ns);
      if ((0 < len && len < size) || (len == 0 && buf[0] == '\0'))
	break;

      /* Buffer was too small, so make it bigger and try again.  */
      len = emacs_nmemftime (NULL, SIZE_MAX, format, formatlen, tmp, tz, ns);
      if (STRING_BYTES_BOUND <= len)
	{
	  xtzfree (tz);
	  string_overflow ();
	}
      size = len + 1;
      buf = SAFE_ALLOCA (size);
    }

  xtzfree (tz);
  AUTO_STRING_WITH_LEN (bufstring, buf, len);
  Lisp_Object result = code_convert_string_norecord (bufstring,
						     Vlocale_coding_system, 0);
  SAFE_FREE ();
  return result;
}

DEFUN ("decode-time", Fdecode_time, Sdecode_time, 0, 2, 0,
       doc: /* Decode a time value as (SEC MINUTE HOUR DAY MONTH YEAR DOW DST UTCOFF).
The optional TIME should be a list of (HIGH LOW . IGNORED),
as from `current-time' and `file-attributes', or nil to use the
current time.  It can also be a single integer number of seconds since
the epoch.  The obsolete form (HIGH . LOW) is also still accepted.

The optional ZONE is omitted or nil for Emacs local time, t for
Universal Time, `wall' for system wall clock time, or a string as in
the TZ environment variable.  It can also be a list (as from
`current-time-zone') or an integer (the UTC offset in seconds) applied
without consideration for daylight saving time.

The list has the following nine members: SEC is an integer between 0
and 60; SEC is 60 for a leap second, which only some operating systems
support.  MINUTE is an integer between 0 and 59.  HOUR is an integer
between 0 and 23.  DAY is an integer between 1 and 31.  MONTH is an
integer between 1 and 12.  YEAR is an integer indicating the
four-digit year.  DOW is the day of week, an integer between 0 and 6,
where 0 is Sunday.  DST is t if daylight saving time is in effect,
otherwise nil.  UTCOFF is an integer indicating the UTC offset in
seconds, i.e., the number of seconds east of Greenwich.  (Note that
Common Lisp has different meanings for DOW and UTCOFF.)

usage: (decode-time &optional TIME ZONE)  */)
  (Lisp_Object specified_time, Lisp_Object zone)
{
  time_t time_spec = lisp_seconds_argument (specified_time);
  struct tm local_tm, gmt_tm;
  timezone_t tz = tzlookup (zone, false);
  struct tm *tm = emacs_localtime_rz (tz, &time_spec, &local_tm);
  xtzfree (tz);

  if (! (tm
	 && MOST_NEGATIVE_FIXNUM - TM_YEAR_BASE <= local_tm.tm_year
	 && local_tm.tm_year <= MOST_POSITIVE_FIXNUM - TM_YEAR_BASE))
    time_overflow ();

  /* Avoid overflow when INT_MAX < EMACS_INT_MAX.  */
  EMACS_INT tm_year_base = TM_YEAR_BASE;

  return CALLN (Flist,
		make_number (local_tm.tm_sec),
		make_number (local_tm.tm_min),
		make_number (local_tm.tm_hour),
		make_number (local_tm.tm_mday),
		make_number (local_tm.tm_mon + 1),
		make_number (local_tm.tm_year + tm_year_base),
		make_number (local_tm.tm_wday),
		local_tm.tm_isdst ? Qt : Qnil,
		(HAVE_TM_GMTOFF
		 ? make_number (tm_gmtoff (&local_tm))
		 : gmtime_r (&time_spec, &gmt_tm)
		 ? make_number (tm_diff (&local_tm, &gmt_tm))
		 : Qnil));
}

/* Return OBJ - OFFSET, checking that OBJ is a valid fixnum and that
   the result is representable as an int.  */
static int
check_tm_member (Lisp_Object obj, int offset)
{
  CHECK_NUMBER (obj);
  EMACS_INT n = XINT (obj);
  int result;
  if (INT_SUBTRACT_WRAPV (n, offset, &result))
    time_overflow ();
  return result;
}

DEFUN ("encode-time", Fencode_time, Sencode_time, 6, MANY, 0,
       doc: /* Convert SECOND, MINUTE, HOUR, DAY, MONTH, YEAR and ZONE to internal time.
This is the reverse operation of `decode-time', which see.

The optional ZONE is omitted or nil for Emacs local time, t for
Universal Time, `wall' for system wall clock time, or a string as in
the TZ environment variable.  It can also be a list (as from
`current-time-zone') or an integer (as from `decode-time') applied
without consideration for daylight saving time.

You can pass more than 7 arguments; then the first six arguments
are used as SECOND through YEAR, and the *last* argument is used as ZONE.
The intervening arguments are ignored.
This feature lets (apply \\='encode-time (decode-time ...)) work.

Out-of-range values for SECOND, MINUTE, HOUR, DAY, or MONTH are allowed;
for example, a DAY of 0 means the day preceding the given month.
Year numbers less than 100 are treated just like other year numbers.
If you want them to stand for years in this century, you must do that yourself.

Years before 1970 are not guaranteed to work.  On some systems,
year values as low as 1901 do work.

usage: (encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  time_t value;
  struct tm tm;
  Lisp_Object zone = (nargs > 6 ? args[nargs - 1] : Qnil);

  tm.tm_sec  = check_tm_member (args[0], 0);
  tm.tm_min  = check_tm_member (args[1], 0);
  tm.tm_hour = check_tm_member (args[2], 0);
  tm.tm_mday = check_tm_member (args[3], 0);
  tm.tm_mon  = check_tm_member (args[4], 1);
  tm.tm_year = check_tm_member (args[5], TM_YEAR_BASE);
  tm.tm_isdst = -1;

  timezone_t tz = tzlookup (zone, false);
  value = emacs_mktime_z (tz, &tm);
  xtzfree (tz);

  if (value == (time_t) -1)
    time_overflow ();

  return list2i (hi_time (value), lo_time (value));
}

DEFUN ("current-time-string", Fcurrent_time_string, Scurrent_time_string,
       0, 2, 0,
       doc: /* Return the current local time, as a human-readable string.
Programs can use this function to decode a time,
since the number of columns in each field is fixed
if the year is in the range 1000-9999.
The format is `Sun Sep 16 01:03:52 1973'.
However, see also the functions `decode-time' and `format-time-string'
which provide a much more powerful and general facility.

If SPECIFIED-TIME is given, it is a time to format instead of the
current time.  The argument should have the form (HIGH LOW . IGNORED).
Thus, you can use times obtained from `current-time' and from
`file-attributes'.  SPECIFIED-TIME can also be a single integer number
of seconds since the epoch.  The obsolete form (HIGH . LOW) is also
still accepted.

The optional ZONE is omitted or nil for Emacs local time, t for
Universal Time, `wall' for system wall clock time, or a string as in
the TZ environment variable.  It can also be a list (as from
`current-time-zone') or an integer (as from `decode-time') applied
without consideration for daylight saving time.  */)
  (Lisp_Object specified_time, Lisp_Object zone)
{
  time_t value = lisp_seconds_argument (specified_time);
  timezone_t tz = tzlookup (zone, false);

  /* Convert to a string in ctime format, except without the trailing
     newline, and without the 4-digit year limit.  Don't use asctime
     or ctime, as they might dump core if the year is outside the
     range -999 .. 9999.  */
  struct tm tm;
  struct tm *tmp = emacs_localtime_rz (tz, &value, &tm);
  xtzfree (tz);
  if (! tmp)
    time_overflow ();

  static char const wday_name[][4] =
    { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
  static char const mon_name[][4] =
    { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  printmax_t year_base = TM_YEAR_BASE;
  char buf[sizeof "Mon Apr 30 12:49:17 " + INT_STRLEN_BOUND (int) + 1];
  int len = sprintf (buf, "%s %s%3d %02d:%02d:%02d %"pMd,
		     wday_name[tm.tm_wday], mon_name[tm.tm_mon], tm.tm_mday,
		     tm.tm_hour, tm.tm_min, tm.tm_sec,
		     tm.tm_year + year_base);

  return make_unibyte_string (buf, len);
}

/* Yield A - B, measured in seconds.
   This function is copied from the GNU C Library.  */
static int
tm_diff (struct tm *a, struct tm *b)
{
  /* Compute intervening leap days correctly even if year is negative.
     Take care to avoid int overflow in leap day calculations,
     but it's OK to assume that A and B are close to each other.  */
  int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
  int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
  int a100 = a4 / 25 - (a4 % 25 < 0);
  int b100 = b4 / 25 - (b4 % 25 < 0);
  int a400 = a100 >> 2;
  int b400 = b100 >> 2;
  int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
  int years = a->tm_year - b->tm_year;
  int days = (365 * years + intervening_leap_days
	      + (a->tm_yday - b->tm_yday));
  return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
		+ (a->tm_min - b->tm_min))
	  + (a->tm_sec - b->tm_sec));
}

/* Yield A's UTC offset, or an unspecified value if unknown.  */
static long int
tm_gmtoff (struct tm *a)
{
#if HAVE_TM_GMTOFF
  return a->tm_gmtoff;
#else
  return 0;
#endif
}

DEFUN ("current-time-zone", Fcurrent_time_zone, Scurrent_time_zone, 0, 2, 0,
       doc: /* Return the offset and name for the local time zone.
This returns a list of the form (OFFSET NAME).
OFFSET is an integer number of seconds ahead of UTC (east of Greenwich).
    A negative value means west of Greenwich.
NAME is a string giving the name of the time zone.
If SPECIFIED-TIME is given, the time zone offset is determined from it
instead of using the current time.  The argument should have the form
\(HIGH LOW . IGNORED).  Thus, you can use times obtained from
`current-time' and from `file-attributes'.  SPECIFIED-TIME can also be
a single integer number of seconds since the epoch.  The obsolete form
(HIGH . LOW) is also still accepted.

The optional ZONE is omitted or nil for Emacs local time, t for
Universal Time, `wall' for system wall clock time, or a string as in
the TZ environment variable.  It can also be a list (as from
`current-time-zone') or an integer (as from `decode-time') applied
without consideration for daylight saving time.

Some operating systems cannot provide all this information to Emacs;
in this case, `current-time-zone' returns a list containing nil for
the data it can't find.  */)
  (Lisp_Object specified_time, Lisp_Object zone)
{
  struct timespec value;
  struct tm local_tm, gmt_tm;
  Lisp_Object zone_offset, zone_name;

  zone_offset = Qnil;
  value = make_timespec (lisp_seconds_argument (specified_time), 0);
  zone_name = format_time_string ("%Z", sizeof "%Z" - 1, value,
				  zone, &local_tm);

  /* gmtime_r expects a pointer to time_t, but tv_sec of struct
     timespec on some systems (MinGW) is a 64-bit field.  */
  time_t tsec = value.tv_sec;
  if (HAVE_TM_GMTOFF || gmtime_r (&tsec, &gmt_tm))
    {
      long int offset = (HAVE_TM_GMTOFF
			 ? tm_gmtoff (&local_tm)
			 : tm_diff (&local_tm, &gmt_tm));
      zone_offset = make_number (offset);
      if (SCHARS (zone_name) == 0)
	{
	  /* No local time zone name is available; use numeric zone instead.  */
	  long int hour = offset / 3600;
	  int min_sec = offset % 3600;
	  int amin_sec = min_sec < 0 ? - min_sec : min_sec;
	  int min = amin_sec / 60;
	  int sec = amin_sec % 60;
	  int min_prec = min_sec ? 2 : 0;
	  int sec_prec = sec ? 2 : 0;
	  char buf[sizeof "+0000" + INT_STRLEN_BOUND (long int)];
	  zone_name = make_formatted_string (buf, "%c%.2ld%.*d%.*d",
					     (offset < 0 ? '-' : '+'),
					     hour, min_prec, min, sec_prec, sec);
	}
    }

  return list2 (zone_offset, zone_name);
}

DEFUN ("set-time-zone-rule", Fset_time_zone_rule, Sset_time_zone_rule, 1, 1, 0,
       doc: /* Set the Emacs local time zone using TZ, a string specifying a time zone rule.
If TZ is nil or `wall', use system wall clock time; this differs from
the usual Emacs convention where nil means current local time.  If TZ
is t, use Universal Time.  If TZ is a list (as from
`current-time-zone') or an integer (as from `decode-time'), use the
specified time zone without consideration for daylight saving time.

Instead of calling this function, you typically want something else.
To temporarily use a different time zone rule for just one invocation
of `decode-time', `encode-time', or `format-time-string', pass the
function a ZONE argument.  To change local time consistently
throughout Emacs, call (setenv "TZ" TZ): this changes both the
environment of the Emacs process and the variable
`process-environment', whereas `set-time-zone-rule' affects only the
former.  */)
  (Lisp_Object tz)
{
  tzlookup (NILP (tz) ? Qwall : tz, true);
  return Qnil;
}

/* A buffer holding a string of the form "TZ=value", intended
   to be part of the environment.  If TZ is supposed to be unset,
   the buffer string is "tZ=".  */
 static char *tzvalbuf;

/* Get the local time zone rule.  */
char *
emacs_getenv_TZ (void)
{
  return tzvalbuf[0] == 'T' ? tzvalbuf + tzeqlen : 0;
}

/* Set the local time zone rule to TZSTRING, which can be null to
   denote wall clock time.  Do not record the setting in LOCAL_TZ.

   This function is not thread-safe, in theory because putenv is not,
   but mostly because of the static storage it updates.  Other threads
   that invoke localtime etc. may be adversely affected while this
   function is executing.  */

int
emacs_setenv_TZ (const char *tzstring)
{
  static ptrdiff_t tzvalbufsize;
  ptrdiff_t tzstringlen = tzstring ? strlen (tzstring) : 0;
  char *tzval = tzvalbuf;
  bool new_tzvalbuf = tzvalbufsize <= tzeqlen + tzstringlen;

  if (new_tzvalbuf)
    {
      /* Do not attempt to free the old tzvalbuf, since another thread
	 may be using it.  In practice, the first allocation is large
	 enough and memory does not leak.  */
      tzval = xpalloc (NULL, &tzvalbufsize,
		       tzeqlen + tzstringlen - tzvalbufsize + 1, -1, 1);
      tzvalbuf = tzval;
      tzval[1] = 'Z';
      tzval[2] = '=';
    }

  if (tzstring)
    {
      /* Modify TZVAL in place.  Although this is dicey in a
	 multithreaded environment, we know of no portable alternative.
	 Calling putenv or setenv could crash some other thread.  */
      tzval[0] = 'T';
      strcpy (tzval + tzeqlen, tzstring);
    }
  else
    {
      /* Turn 'TZ=whatever' into an empty environment variable 'tZ='.
	 Although this is also dicey, calling unsetenv here can crash Emacs.
	 See Bug#8705.  */
      tzval[0] = 't';
      tzval[tzeqlen] = 0;
    }


#ifndef WINDOWSNT
  /* Modifying *TZVAL merely requires calling tzset (which is the
     caller's responsibility).  However, modifying TZVAL requires
     calling putenv; although this is not thread-safe, in practice this
     runs only on startup when there is only one thread.  */
  bool need_putenv = new_tzvalbuf;
#else
  /* MS-Windows 'putenv' copies the argument string into a block it
     allocates, so modifying *TZVAL will not change the environment.
     However, the other threads run by Emacs on MS-Windows never call
     'xputenv' or 'putenv' or 'unsetenv', so the original cause for the
     dicey in-place modification technique doesn't exist there in the
     first place.  */
  bool need_putenv = true;
#endif
  if (need_putenv)
    xputenv (tzval);

  return 0;
}
\f
/* Insert NARGS Lisp objects in the array ARGS by calling INSERT_FUNC
   (if a type of object is Lisp_Int) or INSERT_FROM_STRING_FUNC (if a
   type of object is Lisp_String).  INHERIT is passed to
   INSERT_FROM_STRING_FUNC as the last argument.  */

static void
general_insert_function (void (*insert_func)
			      (const char *, ptrdiff_t),
			 void (*insert_from_string_func)
			      (Lisp_Object, ptrdiff_t, ptrdiff_t,
			       ptrdiff_t, ptrdiff_t, bool),
			 bool inherit, ptrdiff_t nargs, Lisp_Object *args)
{
  ptrdiff_t argnum;
  Lisp_Object val;

  for (argnum = 0; argnum < nargs; argnum++)
    {
      val = args[argnum];
      if (CHARACTERP (val))
	{
	  int c = XFASTINT (val);
	  unsigned char str[MAX_MULTIBYTE_LENGTH];
	  int len;

	  if (!NILP (BVAR (current_buffer, enable_multibyte_characters)))
	    len = CHAR_STRING (c, str);
	  else
	    {
	      str[0] = CHAR_TO_BYTE8 (c);
	      len = 1;
	    }
	  (*insert_func) ((char *) str, len);
	}
      else if (STRINGP (val))
	{
	  (*insert_from_string_func) (val, 0, 0,
				      SCHARS (val),
				      SBYTES (val),
				      inherit);
	}
      else
	wrong_type_argument (Qchar_or_string_p, val);
    }
}

void
insert1 (Lisp_Object arg)
{
  Finsert (1, &arg);
}


DEFUN ("insert", Finsert, Sinsert, 0, MANY, 0,
       doc: /* Insert the arguments, either strings or characters, at point.
Point and after-insertion markers move forward to end up
 after the inserted text.
Any other markers at the point of insertion remain before the text.

If the current buffer is multibyte, unibyte strings are converted
to multibyte for insertion (see `string-make-multibyte').
If the current buffer is unibyte, multibyte strings are converted
to unibyte for insertion (see `string-make-unibyte').

When operating on binary data, it may be necessary to preserve the
original bytes of a unibyte string when inserting it into a multibyte
buffer; to accomplish this, apply `string-as-multibyte' to the string
and insert the result.

usage: (insert &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  general_insert_function (insert, insert_from_string, 0, nargs, args);
  return Qnil;
}

DEFUN ("insert-and-inherit", Finsert_and_inherit, Sinsert_and_inherit,
   0, MANY, 0,
       doc: /* Insert the arguments at point, inheriting properties from adjoining text.
Point and after-insertion markers move forward to end up
 after the inserted text.
Any other markers at the point of insertion remain before the text.

If the current buffer is multibyte, unibyte strings are converted
to multibyte for insertion (see `unibyte-char-to-multibyte').
If the current buffer is unibyte, multibyte strings are converted
to unibyte for insertion.

usage: (insert-and-inherit &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  general_insert_function (insert_and_inherit, insert_from_string, 1,
			   nargs, args);
  return Qnil;
}

DEFUN ("insert-before-markers", Finsert_before_markers, Sinsert_before_markers, 0, MANY, 0,
       doc: /* Insert strings or characters at point, relocating markers after the text.
Point and markers move forward to end up after the inserted text.

If the current buffer is multibyte, unibyte strings are converted
to multibyte for insertion (see `unibyte-char-to-multibyte').
If the current buffer is unibyte, multibyte strings are converted
to unibyte for insertion.

If an overlay begins at the insertion point, the inserted text falls
outside the overlay; if a nonempty overlay ends at the insertion
point, the inserted text falls inside that overlay.

usage: (insert-before-markers &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  general_insert_function (insert_before_markers,
			   insert_from_string_before_markers, 0,
			   nargs, args);
  return Qnil;
}

DEFUN ("insert-before-markers-and-inherit", Finsert_and_inherit_before_markers,
  Sinsert_and_inherit_before_markers, 0, MANY, 0,
       doc: /* Insert text at point, relocating markers and inheriting properties.
Point and markers move forward to end up after the inserted text.

If the current buffer is multibyte, unibyte strings are converted
to multibyte for insertion (see `unibyte-char-to-multibyte').
If the current buffer is unibyte, multibyte strings are converted
to unibyte for insertion.

usage: (insert-before-markers-and-inherit &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  general_insert_function (insert_before_markers_and_inherit,
			   insert_from_string_before_markers, 1,
			   nargs, args);
  return Qnil;
}
\f
DEFUN ("insert-char", Finsert_char, Sinsert_char, 1, 3,
       "(list (read-char-by-name \"Insert character (Unicode name or hex): \")\
              (prefix-numeric-value current-prefix-arg)\
              t))",
       doc: /* Insert COUNT copies of CHARACTER.
Interactively, prompt for CHARACTER.  You can specify CHARACTER in one
of these ways:

 - As its Unicode character name, e.g. \"LATIN SMALL LETTER A\".
   Completion is available; if you type a substring of the name
   preceded by an asterisk `*', Emacs shows all names which include
   that substring, not necessarily at the beginning of the name.

 - As a hexadecimal code point, e.g. 263A.  Note that code points in
   Emacs are equivalent to Unicode up to 10FFFF (which is the limit of
   the Unicode code space).

 - As a code point with a radix specified with #, e.g. #o21430
   (octal), #x2318 (hex), or #10r8984 (decimal).

If called interactively, COUNT is given by the prefix argument.  If
omitted or nil, it defaults to 1.

Inserting the character(s) relocates point and before-insertion
markers in the same ways as the function `insert'.

The optional third argument INHERIT, if non-nil, says to inherit text
properties from adjoining text, if those properties are sticky.  If
called interactively, INHERIT is t.  */)
  (Lisp_Object character, Lisp_Object count, Lisp_Object inherit)
{
  int i, stringlen;
  register ptrdiff_t n;
  int c, len;
  unsigned char str[MAX_MULTIBYTE_LENGTH];
  char string[4000];

  CHECK_CHARACTER (character);
  if (NILP (count))
    XSETFASTINT (count, 1);
  CHECK_NUMBER (count);
  c = XFASTINT (character);

  if (!NILP (BVAR (current_buffer, enable_multibyte_characters)))
    len = CHAR_STRING (c, str);
  else
    str[0] = c, len = 1;
  if (XINT (count) <= 0)
    return Qnil;
  if (BUF_BYTES_MAX / len < XINT (count))
    buffer_overflow ();
  n = XINT (count) * len;
  stringlen = min (n, sizeof string - sizeof string % len);
  for (i = 0; i < stringlen; i++)
    string[i] = str[i % len];
  while (n > stringlen)
    {
      maybe_quit ();
      if (!NILP (inherit))
	insert_and_inherit (string, stringlen);
      else
	insert (string, stringlen);
      n -= stringlen;
    }
  if (!NILP (inherit))
    insert_and_inherit (string, n);
  else
    insert (string, n);
  return Qnil;
}

DEFUN ("insert-byte", Finsert_byte, Sinsert_byte, 2, 3, 0,
       doc: /* Insert COUNT (second arg) copies of BYTE (first arg).
Both arguments are required.
BYTE is a number of the range 0..255.

If BYTE is 128..255 and the current buffer is multibyte, the
corresponding eight-bit character is inserted.

Point, and before-insertion markers, are relocated as in the function `insert'.
The optional third arg INHERIT, if non-nil, says to inherit text properties
from adjoining text, if those properties are sticky.  */)
  (Lisp_Object byte, Lisp_Object count, Lisp_Object inherit)
{
  CHECK_NUMBER (byte);
  if (XINT (byte) < 0 || XINT (byte) > 255)
    args_out_of_range_3 (byte, make_number (0), make_number (255));
  if (XINT (byte) >= 128
      && ! NILP (BVAR (current_buffer, enable_multibyte_characters)))
    XSETFASTINT (byte, BYTE8_TO_CHAR (XINT (byte)));
  return Finsert_char (byte, count, inherit);
}

\f
/* Making strings from buffer contents.  */

/* Return a Lisp_String containing the text of the current buffer from
   START to END.  If text properties are in use and the current buffer
   has properties in the range specified, the resulting string will also
   have them, if PROPS is true.

   We don't want to use plain old make_string here, because it calls
   make_uninit_string, which can cause the buffer arena to be
   compacted.  make_string has no way of knowing that the data has
   been moved, and thus copies the wrong data into the string.  This
   doesn't effect most of the other users of make_string, so it should
   be left as is.  But we should use this function when conjuring
   buffer substrings.  */

Lisp_Object
make_buffer_string (ptrdiff_t start, ptrdiff_t end, bool props)
{
  ptrdiff_t start_byte = CHAR_TO_BYTE (start);
  ptrdiff_t end_byte = CHAR_TO_BYTE (end);

  return make_buffer_string_both (start, start_byte, end, end_byte, props);
}

/* Return a Lisp_String containing the text of the current buffer from
   START / START_BYTE to END / END_BYTE.

   If text properties are in use and the current buffer
   has properties in the range specified, the resulting string will also
   have them, if PROPS is true.

   We don't want to use plain old make_string here, because it calls
   make_uninit_string, which can cause the buffer arena to be
   compacted.  make_string has no way of knowing that the data has
   been moved, and thus copies the wrong data into the string.  This
   doesn't effect most of the other users of make_string, so it should
   be left as is.  But we should use this function when conjuring
   buffer substrings.  */

Lisp_Object
make_buffer_string_both (ptrdiff_t start, ptrdiff_t start_byte,
			 ptrdiff_t end, ptrdiff_t end_byte, bool props)
{
  Lisp_Object result, tem, tem1;
  ptrdiff_t beg0, end0, beg1, end1, size;

  if (start_byte < GPT_BYTE && GPT_BYTE < end_byte)
    {
      /* Two regions, before and after the gap.  */
      beg0 = start_byte;
      end0 = GPT_BYTE;
      beg1 = GPT_BYTE + GAP_SIZE - BEG_BYTE;
      end1 = end_byte + GAP_SIZE - BEG_BYTE;
    }
  else
    {
      /* The only region.  */
      beg0 = start_byte;
      end0 = end_byte;
      beg1 = -1;
      end1 = -1;
    }

  if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
    result = make_uninit_multibyte_string (end - start, end_byte - start_byte);
  else
    result = make_uninit_string (end - start);

  size = end0 - beg0;
  memcpy (SDATA (result), BYTE_POS_ADDR (beg0), size);
  if (beg1 != -1)
    memcpy (SDATA (result) + size, BEG_ADDR + beg1, end1 - beg1);

  /* If desired, update and copy the text properties.  */
  if (props)
    {
      update_buffer_properties (start, end);

      tem = Fnext_property_change (make_number (start), Qnil, make_number (end));
      tem1 = Ftext_properties_at (make_number (start), Qnil);

      if (XINT (tem) != end || !NILP (tem1))
	copy_intervals_to_string (result, current_buffer, start,
				  end - start);
    }

  return result;
}

/* Call Vbuffer_access_fontify_functions for the range START ... END
   in the current buffer, if necessary.  */

static void
update_buffer_properties (ptrdiff_t start, ptrdiff_t end)
{
  /* If this buffer has some access functions,
     call them, specifying the range of the buffer being accessed.  */
  if (!NILP (Vbuffer_access_fontify_functions))
    {
      /* But don't call them if we can tell that the work
	 has already been done.  */
      if (!NILP (Vbuffer_access_fontified_property))
	{
	  Lisp_Object tem
	    = Ftext_property_any (make_number (start), make_number (end),
				  Vbuffer_access_fontified_property,
				  Qnil, Qnil);
	  if (NILP (tem))
	    return;
	}

      CALLN (Frun_hook_with_args, Qbuffer_access_fontify_functions,
	     make_number (start), make_number (end));
    }
}

DEFUN ("buffer-substring", Fbuffer_substring, Sbuffer_substring, 2, 2, 0,
       doc: /* Return the contents of part of the current buffer as a string.
The two arguments START and END are character positions;
they can be in either order.
The string returned is multibyte if the buffer is multibyte.

This function copies the text properties of that part of the buffer
into the result string; if you don't want the text properties,
use `buffer-substring-no-properties' instead.  */)
  (Lisp_Object start, Lisp_Object end)
{
  register ptrdiff_t b, e;

  validate_region (&start, &end);
  b = XINT (start);
  e = XINT (end);

  return make_buffer_string (b, e, 1);
}

DEFUN ("buffer-substring-no-properties", Fbuffer_substring_no_properties,
       Sbuffer_substring_no_properties, 2, 2, 0,
       doc: /* Return the characters of part of the buffer, without the text properties.
The two arguments START and END are character positions;
they can be in either order.  */)
  (Lisp_Object start, Lisp_Object end)
{
  register ptrdiff_t b, e;

  validate_region (&start, &end);
  b = XINT (start);
  e = XINT (end);

  return make_buffer_string (b, e, 0);
}

DEFUN ("buffer-string", Fbuffer_string, Sbuffer_string, 0, 0, 0,
       doc: /* Return the contents of the current buffer as a string.
If narrowing is in effect, this function returns only the visible part
of the buffer.  */)
  (void)
{
  return make_buffer_string_both (BEGV, BEGV_BYTE, ZV, ZV_BYTE, 1);
}

DEFUN ("insert-buffer-substring", Finsert_buffer_substring, Sinsert_buffer_substring,
       1, 3, 0,
       doc: /* Insert before point a substring of the contents of BUFFER.
BUFFER may be a buffer or a buffer name.
Arguments START and END are character positions specifying the substring.
They default to the values of (point-min) and (point-max) in BUFFER.

Point and before-insertion markers move forward to end up after the
inserted text.
Any other markers at the point of insertion remain before the text.

If the current buffer is multibyte and BUFFER is unibyte, or vice
versa, strings are converted from unibyte to multibyte or vice versa
using `string-make-multibyte' or `string-make-unibyte', which see.  */)
  (Lisp_Object buffer, Lisp_Object start, Lisp_Object end)
{
  register EMACS_INT b, e, temp;
  register struct buffer *bp, *obuf;
  Lisp_Object buf;

  buf = Fget_buffer (buffer);
  if (NILP (buf))
    nsberror (buffer);
  bp = XBUFFER (buf);
  if (!BUFFER_LIVE_P (bp))
    error ("Selecting deleted buffer");

  if (NILP (start))
    b = BUF_BEGV (bp);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (start);
      b = XINT (start);
    }
  if (NILP (end))
    e = BUF_ZV (bp);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (end);
      e = XINT (end);
    }

  if (b > e)
    temp = b, b = e, e = temp;

  if (!(BUF_BEGV (bp) <= b && e <= BUF_ZV (bp)))
    args_out_of_range (start, end);

  obuf = current_buffer;
  set_buffer_internal_1 (bp);
  update_buffer_properties (b, e);
  set_buffer_internal_1 (obuf);

  insert_from_buffer (bp, b, e - b, 0);
  return Qnil;
}

DEFUN ("compare-buffer-substrings", Fcompare_buffer_substrings, Scompare_buffer_substrings,
       6, 6, 0,
       doc: /* Compare two substrings of two buffers; return result as number.
Return -N if first string is less after N-1 chars, +N if first string is
greater after N-1 chars, or 0 if strings match.
The first substring is in BUFFER1 from START1 to END1 and the second
is in BUFFER2 from START2 to END2.
All arguments may be nil.  If BUFFER1 or BUFFER2 is nil, the current
buffer is used.  If START1 or START2 is nil, the value of `point-min'
in the respective buffers is used.  If END1 or END2 is nil, the value
of `point-max' in the respective buffers is used.
The value of `case-fold-search' in the current buffer
determines whether case is significant or ignored.  */)
  (Lisp_Object buffer1, Lisp_Object start1, Lisp_Object end1, Lisp_Object buffer2, Lisp_Object start2, Lisp_Object end2)
{
  register EMACS_INT begp1, endp1, begp2, endp2, temp;
  register struct buffer *bp1, *bp2;
  register Lisp_Object trt
    = (!NILP (BVAR (current_buffer, case_fold_search))
       ? BVAR (current_buffer, case_canon_table) : Qnil);
  ptrdiff_t chars = 0;
  ptrdiff_t i1, i2, i1_byte, i2_byte;

  /* Find the first buffer and its substring.  */

  if (NILP (buffer1))
    bp1 = current_buffer;
  else
    {
      Lisp_Object buf1;
      buf1 = Fget_buffer (buffer1);
      if (NILP (buf1))
	nsberror (buffer1);
      bp1 = XBUFFER (buf1);
      if (!BUFFER_LIVE_P (bp1))
	error ("Selecting deleted buffer");
    }

  if (NILP (start1))
    begp1 = BUF_BEGV (bp1);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (start1);
      begp1 = XINT (start1);
    }
  if (NILP (end1))
    endp1 = BUF_ZV (bp1);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (end1);
      endp1 = XINT (end1);
    }

  if (begp1 > endp1)
    temp = begp1, begp1 = endp1, endp1 = temp;

  if (!(BUF_BEGV (bp1) <= begp1
	&& begp1 <= endp1
        && endp1 <= BUF_ZV (bp1)))
    args_out_of_range (start1, end1);

  /* Likewise for second substring.  */

  if (NILP (buffer2))
    bp2 = current_buffer;
  else
    {
      Lisp_Object buf2;
      buf2 = Fget_buffer (buffer2);
      if (NILP (buf2))
	nsberror (buffer2);
      bp2 = XBUFFER (buf2);
      if (!BUFFER_LIVE_P (bp2))
	error ("Selecting deleted buffer");
    }

  if (NILP (start2))
    begp2 = BUF_BEGV (bp2);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (start2);
      begp2 = XINT (start2);
    }
  if (NILP (end2))
    endp2 = BUF_ZV (bp2);
  else
    {
      CHECK_NUMBER_COERCE_MARKER (end2);
      endp2 = XINT (end2);
    }

  if (begp2 > endp2)
    temp = begp2, begp2 = endp2, endp2 = temp;

  if (!(BUF_BEGV (bp2) <= begp2
	&& begp2 <= endp2
        && endp2 <= BUF_ZV (bp2)))
    args_out_of_range (start2, end2);

  i1 = begp1;
  i2 = begp2;
  i1_byte = buf_charpos_to_bytepos (bp1, i1);
  i2_byte = buf_charpos_to_bytepos (bp2, i2);

  while (i1 < endp1 && i2 < endp2)
    {
      /* When we find a mismatch, we must compare the
	 characters, not just the bytes.  */
      int c1, c2;

      if (! NILP (BVAR (bp1, enable_multibyte_characters)))
	{
	  c1 = BUF_FETCH_MULTIBYTE_CHAR (bp1, i1_byte);
	  BUF_INC_POS (bp1, i1_byte);
	  i1++;
	}
      else
	{
	  c1 = BUF_FETCH_BYTE (bp1, i1);
	  MAKE_CHAR_MULTIBYTE (c1);
	  i1++;
	}

      if (! NILP (BVAR (bp2, enable_multibyte_characters)))
	{
	  c2 = BUF_FETCH_MULTIBYTE_CHAR (bp2, i2_byte);
	  BUF_INC_POS (bp2, i2_byte);
	  i2++;
	}
      else
	{
	  c2 = BUF_FETCH_BYTE (bp2, i2);
	  MAKE_CHAR_MULTIBYTE (c2);
	  i2++;
	}

      if (!NILP (trt))
	{
	  c1 = char_table_translate (trt, c1);
	  c2 = char_table_translate (trt, c2);
	}

      if (c1 != c2)
	return make_number (c1 < c2 ? -1 - chars : chars + 1);

      chars++;
      rarely_quit (chars);
    }

  /* The strings match as far as they go.
     If one is shorter, that one is less.  */
  if (chars < endp1 - begp1)
    return make_number (chars + 1);
  else if (chars < endp2 - begp2)
    return make_number (- chars - 1);

  /* Same length too => they are equal.  */
  return make_number (0);
}

\f
/* Set up necessary definitions for diffseq.h; see comments in
   diffseq.h for explanation.  */

#undef ELEMENT
#undef EQUAL

#define XVECREF_YVECREF_EQUAL(ctx, xoff, yoff)  \
  buffer_chars_equal ((ctx), (xoff), (yoff))

#define OFFSET ptrdiff_t

#define EXTRA_CONTEXT_FIELDS                    \
  /* Buffers to compare.  */                    \
  struct buffer *buffer_a;                      \
  struct buffer *buffer_b;                      \
  /* Bit vectors recording for each character whether it was deleted
     or inserted.  */                           \
  unsigned char *deletions;                     \
  unsigned char *insertions;

#define NOTE_DELETE(ctx, xoff) set_bit ((ctx)->deletions, (xoff))
#define NOTE_INSERT(ctx, yoff) set_bit ((ctx)->insertions, (yoff))

struct context;
static void set_bit (unsigned char *, OFFSET);
static bool bit_is_set (const unsigned char *, OFFSET);
static bool buffer_chars_equal (struct context *, OFFSET, OFFSET);

#include "minmax.h"
#include "diffseq.h"

DEFUN ("replace-buffer-contents", Freplace_buffer_contents,
       Sreplace_buffer_contents, 1, 1, "bSource buffer: ",
       doc: /* Replace accessible portion of current buffer with that of SOURCE.
SOURCE can be a buffer or a string that names a buffer.
Interactively, prompt for SOURCE.
As far as possible the replacement is non-destructive, i.e. existing
buffer contents, markers, properties, and overlays in the current
buffer stay intact.  */)
  (Lisp_Object source)
{
  struct buffer *a = current_buffer;
  Lisp_Object source_buffer = Fget_buffer (source);
  if (NILP (source_buffer))
    nsberror (source);
  struct buffer *b = XBUFFER (source_buffer);
  if (! BUFFER_LIVE_P (b))
    error ("Selecting deleted buffer");
  if (a == b)
    error ("Cannot replace a buffer with itself");

  ptrdiff_t min_a = BEGV;
  ptrdiff_t min_b = BUF_BEGV (b);
  ptrdiff_t size_a = ZV - min_a;
  ptrdiff_t size_b = BUF_ZV (b) - min_b;
  eassume (size_a >= 0);
  eassume (size_b >= 0);
  bool a_empty = size_a == 0;
  bool b_empty = size_b == 0;

  /* Handle trivial cases where at least one accessible portion is
     empty.  */

  if (a_empty && b_empty)
    return Qnil;

  if (a_empty)
    return Finsert_buffer_substring (source, Qnil, Qnil);

  if (b_empty)
    {
      del_range_both (BEGV, BEGV_BYTE, ZV, ZV_BYTE, true);
      return Qnil;
    }

  /* FIXME: It is not documented how to initialize the contents of the
     context structure.  This code cargo-cults from the existing
     caller in src/analyze.c of GNU Diffutils, which appears to
     work.  */

  ptrdiff_t diags = size_a + size_b + 3;
  ptrdiff_t *buffer;
  USE_SAFE_ALLOCA;
  SAFE_NALLOCA (buffer, 2, diags);
  /* Micro-optimization: Casting to size_t generates much better
     code.  */
  ptrdiff_t del_bytes = (size_t) size_a / CHAR_BIT + 1;
  ptrdiff_t ins_bytes = (size_t) size_b / CHAR_BIT + 1;
  struct context ctx = {
    .buffer_a = a,
    .buffer_b = b,
    .deletions = SAFE_ALLOCA (del_bytes),
    .insertions = SAFE_ALLOCA (ins_bytes),
    .fdiag = buffer + size_b + 1,
    .bdiag = buffer + diags + size_b + 1,
    /* FIXME: Find a good number for .too_expensive.  */
    .too_expensive = 1000000,
  };
  memclear (ctx.deletions, del_bytes);
  memclear (ctx.insertions, ins_bytes);
  /* compareseq requires indices to be zero-based.  We add BEGV back
     later.  */
  bool early_abort = compareseq (0, size_a, 0, size_b, false, &ctx);
  /* Since we didn’t define EARLY_ABORT, we should never abort
     early.  */
  eassert (! early_abort);
  SAFE_FREE ();

  Fundo_boundary ();
  ptrdiff_t count = SPECPDL_INDEX ();
  record_unwind_protect (save_excursion_restore, save_excursion_save ());

  ptrdiff_t i = size_a;
  ptrdiff_t j = size_b;
  /* Walk backwards through the lists of changes.  This was also
     cargo-culted from src/analyze.c in GNU Diffutils.  Because we
     walk backwards, we don’t have to keep the positions in sync.  */
  while (i >= 0 || j >= 0)
    {
      /* Check whether there is a change (insertion or deletion)
         before the current position.  */
      if ((i > 0 && bit_is_set (ctx.deletions, i - 1)) ||
          (j > 0 && bit_is_set (ctx.insertions, j - 1)))
	{
          ptrdiff_t end_a = min_a + i;
          ptrdiff_t end_b = min_b + j;
          /* Find the beginning of the current change run.  */
	  while (i > 0 && bit_is_set (ctx.deletions, i - 1))
            --i;
	  while (j > 0 && bit_is_set (ctx.insertions, j - 1))
            --j;
          ptrdiff_t beg_a = min_a + i;
          ptrdiff_t beg_b = min_b + j;
          eassert (beg_a >= BEGV);
          eassert (beg_b >= BUF_BEGV (b));
          eassert (beg_a <= end_a);
          eassert (beg_b <= end_b);
          eassert (end_a <= ZV);
          eassert (end_b <= BUF_ZV (b));
          eassert (beg_a < end_a || beg_b < end_b);
          if (beg_a < end_a)
            del_range (beg_a, end_a);
          if (beg_b < end_b)
            {
              SET_PT (beg_a);
              Finsert_buffer_substring (source, make_natnum (beg_b),
                                        make_natnum (end_b));
            }
	}
      --i;
      --j;
    }

  return unbind_to (count, Qnil);
}

static void
set_bit (unsigned char *a, ptrdiff_t i)
{
  eassert (i >= 0);
  /* Micro-optimization: Casting to size_t generates much better
     code.  */
  size_t j = i;
  a[j / CHAR_BIT] |= (1 << (j % CHAR_BIT));
}

static bool
bit_is_set (const unsigned char *a, ptrdiff_t i)
{
  eassert (i >= 0);
  /* Micro-optimization: Casting to size_t generates much better
     code.  */
  size_t j = i;
  return a[j / CHAR_BIT] & (1 << (j % CHAR_BIT));
}

/* Return true if the characters at position POS_A of buffer
   CTX->buffer_a and at position POS_B of buffer CTX->buffer_b are
   equal.  POS_A and POS_B are zero-based.  Text properties are
   ignored.  */

static bool
buffer_chars_equal (struct context *ctx,
                    ptrdiff_t pos_a, ptrdiff_t pos_b)
{
  eassert (pos_a >= 0);
  pos_a += BUF_BEGV (ctx->buffer_a);
  eassert (pos_a >= BUF_BEGV (ctx->buffer_a));
  eassert (pos_a < BUF_ZV (ctx->buffer_a));

  eassert (pos_b >= 0);
  pos_b += BUF_BEGV (ctx->buffer_b);
  eassert (pos_b >= BUF_BEGV (ctx->buffer_b));
  eassert (pos_b < BUF_ZV (ctx->buffer_b));

  return BUF_FETCH_CHAR_AS_MULTIBYTE (ctx->buffer_a, pos_a)
    == BUF_FETCH_CHAR_AS_MULTIBYTE (ctx->buffer_b, pos_b);
}

\f
static void
subst_char_in_region_unwind (Lisp_Object arg)
{
  bset_undo_list (current_buffer, arg);
}

static void
subst_char_in_region_unwind_1 (Lisp_Object arg)
{
  bset_filename (current_buffer, arg);
}

DEFUN ("subst-char-in-region", Fsubst_char_in_region,
       Ssubst_char_in_region, 4, 5, 0,
       doc: /* From START to END, replace FROMCHAR with TOCHAR each time it occurs.
If optional arg NOUNDO is non-nil, don't record this change for undo
and don't mark the buffer as really changed.
Both characters must have the same length of multi-byte form.  */)
  (Lisp_Object start, Lisp_Object end, Lisp_Object fromchar, Lisp_Object tochar, Lisp_Object noundo)
{
  register ptrdiff_t pos, pos_byte, stop, i, len, end_byte;
  /* Keep track of the first change in the buffer:
     if 0 we haven't found it yet.
     if < 0 we've found it and we've run the before-change-function.
     if > 0 we've actually performed it and the value is its position.  */
  ptrdiff_t changed = 0;
  unsigned char fromstr[MAX_MULTIBYTE_LENGTH], tostr[MAX_MULTIBYTE_LENGTH];
  unsigned char *p;
  ptrdiff_t count = SPECPDL_INDEX ();
#define COMBINING_NO	 0
#define COMBINING_BEFORE 1
#define COMBINING_AFTER  2
#define COMBINING_BOTH (COMBINING_BEFORE | COMBINING_AFTER)
  int maybe_byte_combining = COMBINING_NO;
  ptrdiff_t last_changed = 0;
  bool multibyte_p
    = !NILP (BVAR (current_buffer, enable_multibyte_characters));
  int fromc, toc;

 restart:

  validate_region (&start, &end);
  CHECK_CHARACTER (fromchar);
  CHECK_CHARACTER (tochar);
  fromc = XFASTINT (fromchar);
  toc = XFASTINT (tochar);

  if (multibyte_p)
    {
      len = CHAR_STRING (fromc, fromstr);
      if (CHAR_STRING (toc, tostr) != len)
	error ("Characters in `subst-char-in-region' have different byte-lengths");
      if (!ASCII_CHAR_P (*tostr))
	{
	  /* If *TOSTR is in the range 0x80..0x9F and TOCHAR is not a
	     complete multibyte character, it may be combined with the
	     after bytes.  If it is in the range 0xA0..0xFF, it may be
	     combined with the before and after bytes.  */
	  if (!CHAR_HEAD_P (*tostr))
	    maybe_byte_combining = COMBINING_BOTH;
	  else if (BYTES_BY_CHAR_HEAD (*tostr) > len)
	    maybe_byte_combining = COMBINING_AFTER;
	}
    }
  else
    {
      len = 1;
      fromstr[0] = fromc;
      tostr[0] = toc;
    }

  pos = XINT (start);
  pos_byte = CHAR_TO_BYTE (pos);
  stop = CHAR_TO_BYTE (XINT (end));
  end_byte = stop;

  /* If we don't want undo, turn off putting stuff on the list.
     That's faster than getting rid of things,
     and it prevents even the entry for a first change.
     Also inhibit locking the file.  */
  if (!changed && !NILP (noundo))
    {
      record_unwind_protect (subst_char_in_region_unwind,
			     BVAR (current_buffer, undo_list));
      bset_undo_list (current_buffer, Qt);
      /* Don't do file-locking.  */
      record_unwind_protect (subst_char_in_region_unwind_1,
			     BVAR (current_buffer, filename));
      bset_filename (current_buffer, Qnil);
    }

  if (pos_byte < GPT_BYTE)
    stop = min (stop, GPT_BYTE);
  while (1)
    {
      ptrdiff_t pos_byte_next = pos_byte;

      if (pos_byte >= stop)
	{
	  if (pos_byte >= end_byte) break;
	  stop = end_byte;
	}
      p = BYTE_POS_ADDR (pos_byte);
      if (multibyte_p)
	INC_POS (pos_byte_next);
      else
	++pos_byte_next;
      if (pos_byte_next - pos_byte == len
	  && p[0] == fromstr[0]
	  && (len == 1
	      || (p[1] == fromstr[1]
		  && (len == 2 || (p[2] == fromstr[2]
				 && (len == 3 || p[3] == fromstr[3]))))))
	{
	  if (changed < 0)
	    /* We've already seen this and run the before-change-function;
	       this time we only need to record the actual position. */
	    changed = pos;
	  else if (!changed)
	    {
	      changed = -1;
	      modify_text (pos, XINT (end));

	      if (! NILP (noundo))
		{
		  if (MODIFF - 1 == SAVE_MODIFF)
		    SAVE_MODIFF++;
		  if (MODIFF - 1 == BUF_AUTOSAVE_MODIFF (current_buffer))
		    BUF_AUTOSAVE_MODIFF (current_buffer)++;
		}

	      /* The before-change-function may have moved the gap
		 or even modified the buffer so we should start over. */
	      goto restart;
	    }

	  /* Take care of the case where the new character
	     combines with neighboring bytes.  */
	  if (maybe_byte_combining
	      && (maybe_byte_combining == COMBINING_AFTER
		  ? (pos_byte_next < Z_BYTE
		     && ! CHAR_HEAD_P (FETCH_BYTE (pos_byte_next)))
		  : ((pos_byte_next < Z_BYTE
		      && ! CHAR_HEAD_P (FETCH_BYTE (pos_byte_next)))
		     || (pos_byte > BEG_BYTE
			 && ! ASCII_CHAR_P (FETCH_BYTE (pos_byte - 1))))))
	    {
	      Lisp_Object tem, string;

	      tem = BVAR (current_buffer, undo_list);

	      /* Make a multibyte string containing this single character.  */
	      string = make_multibyte_string ((char *) tostr, 1, len);
	      /* replace_range is less efficient, because it moves the gap,
		 but it handles combining correctly.  */
	      replace_range (pos, pos + 1, string,
			     0, 0, 1, 0);
	      pos_byte_next = CHAR_TO_BYTE (pos);
	      if (pos_byte_next > pos_byte)
		/* Before combining happened.  We should not increment
		   POS.  So, to cancel the later increment of POS,
		   decrease it now.  */
		pos--;
	      else
		INC_POS (pos_byte_next);

	      if (! NILP (noundo))
		bset_undo_list (current_buffer, tem);
	    }
	  else
	    {
	      if (NILP (noundo))
		record_change (pos, 1);
	      for (i = 0; i < len; i++) *p++ = tostr[i];
	    }
	  last_changed =  pos + 1;
	}
      pos_byte = pos_byte_next;
      pos++;
    }

  if (changed > 0)
    {
      signal_after_change (changed,
			   last_changed - changed, last_changed - changed);
      update_compositions (changed, last_changed, CHECK_ALL);
    }

  unbind_to (count, Qnil);
  return Qnil;
}


static Lisp_Object check_translation (ptrdiff_t, ptrdiff_t, ptrdiff_t,
				      Lisp_Object);

/* Helper function for Ftranslate_region_internal.

   Check if a character sequence at POS (POS_BYTE) matches an element
   of VAL.  VAL is a list (([FROM-CHAR ...] . TO) ...).  If a matching
   element is found, return it.  Otherwise return Qnil.  */

static Lisp_Object
check_translation (ptrdiff_t pos, ptrdiff_t pos_byte, ptrdiff_t end,
		   Lisp_Object val)
{
  int initial_buf[16];
  int *buf = initial_buf;
  ptrdiff_t buf_size = ARRAYELTS (initial_buf);
  int *bufalloc = 0;
  ptrdiff_t buf_used = 0;
  Lisp_Object result = Qnil;

  for (; CONSP (val); val = XCDR (val))
    {
      Lisp_Object elt;
      ptrdiff_t len, i;

      elt = XCAR (val);
      if (! CONSP (elt))
	continue;
      elt = XCAR (elt);
      if (! VECTORP (elt))
	continue;
      len = ASIZE (elt);
      if (len <= end - pos)
	{
	  for (i = 0; i < len; i++)
	    {
	      if (buf_used <= i)
		{
		  unsigned char *p = BYTE_POS_ADDR (pos_byte);
		  int len1;

		  if (buf_used == buf_size)
		    {
		      bufalloc = xpalloc (bufalloc, &buf_size, 1, -1,
					  sizeof *bufalloc);
		      if (buf == initial_buf)
			memcpy (bufalloc, buf, sizeof initial_buf);
		      buf = bufalloc;
		    }
		  buf[buf_used++] = STRING_CHAR_AND_LENGTH (p, len1);
		  pos_byte += len1;
		}
	      if (XINT (AREF (elt, i)) != buf[i])
		break;
	    }
	  if (i == len)
	    {
	      result = XCAR (val);
	      break;
	    }
	}
    }

  xfree (bufalloc);
  return result;
}


DEFUN ("translate-region-internal", Ftranslate_region_internal,
       Stranslate_region_internal, 3, 3, 0,
       doc: /* Internal use only.
From START to END, translate characters according to TABLE.
TABLE is a string or a char-table; the Nth character in it is the
mapping for the character with code N.
It returns the number of characters changed.  */)
  (Lisp_Object start, Lisp_Object end, register Lisp_Object table)
{
  register unsigned char *tt;	/* Trans table. */
  register int nc;		/* New character. */
  int cnt;			/* Number of changes made. */
  ptrdiff_t size;		/* Size of translate table. */
  ptrdiff_t pos, pos_byte, end_pos;
  bool multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters));
  bool string_multibyte UNINIT;

  validate_region (&start, &end);
  if (CHAR_TABLE_P (table))
    {
      if (! EQ (XCHAR_TABLE (table)->purpose, Qtranslation_table))
	error ("Not a translation table");
      size = MAX_CHAR;
      tt = NULL;
    }
  else
    {
      CHECK_STRING (table);

      if (! multibyte && (SCHARS (table) < SBYTES (table)))
	table = string_make_unibyte (table);
      string_multibyte = SCHARS (table) < SBYTES (table);
      size = SBYTES (table);
      tt = SDATA (table);
    }

  pos = XINT (start);
  pos_byte = CHAR_TO_BYTE (pos);
  end_pos = XINT (end);
  modify_text (pos, end_pos);

  cnt = 0;
  for (; pos < end_pos; )
    {
      unsigned char *p = BYTE_POS_ADDR (pos_byte);
      unsigned char *str UNINIT;
      unsigned char buf[MAX_MULTIBYTE_LENGTH];
      int len, str_len;
      int oc;
      Lisp_Object val;

      if (multibyte)
	oc = STRING_CHAR_AND_LENGTH (p, len);
      else
	oc = *p, len = 1;
      if (oc < size)
	{
	  if (tt)
	    {
	      /* Reload as signal_after_change in last iteration may GC.  */
	      tt = SDATA (table);
	      if (string_multibyte)
		{
		  str = tt + string_char_to_byte (table, oc);
		  nc = STRING_CHAR_AND_LENGTH (str, str_len);
		}
	      else
		{
		  nc = tt[oc];
		  if (! ASCII_CHAR_P (nc) && multibyte)
		    {
		      str_len = BYTE8_STRING (nc, buf);
		      str = buf;
		    }
		  else
		    {
		      str_len = 1;
		      str = tt + oc;
		    }
		}
	    }
	  else
	    {
	      nc = oc;
	      val = CHAR_TABLE_REF (table, oc);
	      if (CHARACTERP (val))
		{
		  nc = XFASTINT (val);
		  str_len = CHAR_STRING (nc, buf);
		  str = buf;
		}
	      else if (VECTORP (val) || (CONSP (val)))
		{
		  /* VAL is [TO_CHAR ...] or (([FROM-CHAR ...] .  TO) ...)
		     where TO is TO-CHAR or [TO-CHAR ...].  */
		  nc = -1;
		}
	    }

	  if (nc != oc && nc >= 0)
	    {
	      /* Simple one char to one char translation.  */
	      if (len != str_len)
		{
		  Lisp_Object string;

		  /* This is less efficient, because it moves the gap,
		     but it should handle multibyte characters correctly.  */
		  string = make_multibyte_string ((char *) str, 1, str_len);
		  replace_range (pos, pos + 1, string, 1, 0, 1, 0);
		  len = str_len;
		}
	      else
		{
		  record_change (pos, 1);
		  while (str_len-- > 0)
		    *p++ = *str++;
		  signal_after_change (pos, 1, 1);
		  update_compositions (pos, pos + 1, CHECK_BORDER);
		}
	      ++cnt;
	    }
	  else if (nc < 0)
	    {
	      Lisp_Object string;

	      if (CONSP (val))
		{
		  val = check_translation (pos, pos_byte, end_pos, val);
		  if (NILP (val))
		    {
		      pos_byte += len;
		      pos++;
		      continue;
		    }
		  /* VAL is ([FROM-CHAR ...] . TO).  */
		  len = ASIZE (XCAR (val));
		  val = XCDR (val);
		}
	      else
		len = 1;

	      if (VECTORP (val))
		{
		  string = Fconcat (1, &val);
		}
	      else
		{
		  string = Fmake_string (make_number (1), val);
		}
	      replace_range (pos, pos + len, string, 1, 0, 1, 0);
	      pos_byte += SBYTES (string);
	      pos += SCHARS (string);
	      cnt += SCHARS (string);
	      end_pos += SCHARS (string) - len;
	      continue;
	    }
	}
      pos_byte += len;
      pos++;
    }

  return make_number (cnt);
}

DEFUN ("delete-region", Fdelete_region, Sdelete_region, 2, 2, "r",
       doc: /* Delete the text between START and END.
If called interactively, delete the region between point and mark.
This command deletes buffer text without modifying the kill ring.  */)
  (Lisp_Object start, Lisp_Object end)
{
  validate_region (&start, &end);
  del_range (XINT (start), XINT (end));
  return Qnil;
}

DEFUN ("delete-and-extract-region", Fdelete_and_extract_region,
       Sdelete_and_extract_region, 2, 2, 0,
       doc: /* Delete the text between START and END and return it.  */)
  (Lisp_Object start, Lisp_Object end)
{
  validate_region (&start, &end);
  if (XINT (start) == XINT (end))
    return empty_unibyte_string;
  return del_range_1 (XINT (start), XINT (end), 1, 1);
}
\f
DEFUN ("widen", Fwiden, Swiden, 0, 0, "",
       doc: /* Remove restrictions (narrowing) from current buffer.
This allows the buffer's full text to be seen and edited.  */)
  (void)
{
  if (BEG != BEGV || Z != ZV)
    current_buffer->clip_changed = 1;
  BEGV = BEG;
  BEGV_BYTE = BEG_BYTE;
  SET_BUF_ZV_BOTH (current_buffer, Z, Z_BYTE);
  /* Changing the buffer bounds invalidates any recorded current column.  */
  invalidate_current_column ();
  return Qnil;
}

DEFUN ("narrow-to-region", Fnarrow_to_region, Snarrow_to_region, 2, 2, "r",
       doc: /* Restrict editing in this buffer to the current region.
The rest of the text becomes temporarily invisible and untouchable
but is not deleted; if you save the buffer in a file, the invisible
text is included in the file.  \\[widen] makes all visible again.
See also `save-restriction'.

When calling from a program, pass two arguments; positions (integers
or markers) bounding the text that should remain visible.  */)
  (register Lisp_Object start, Lisp_Object end)
{
  CHECK_NUMBER_COERCE_MARKER (start);
  CHECK_NUMBER_COERCE_MARKER (end);

  if (XINT (start) > XINT (end))
    {
      Lisp_Object tem;
      tem = start; start = end; end = tem;
    }

  if (!(BEG <= XINT (start) && XINT (start) <= XINT (end) && XINT (end) <= Z))
    args_out_of_range (start, end);

  if (BEGV != XFASTINT (start) || ZV != XFASTINT (end))
    current_buffer->clip_changed = 1;

  SET_BUF_BEGV (current_buffer, XFASTINT (start));
  SET_BUF_ZV (current_buffer, XFASTINT (end));
  if (PT < XFASTINT (start))
    SET_PT (XFASTINT (start));
  if (PT > XFASTINT (end))
    SET_PT (XFASTINT (end));
  /* Changing the buffer bounds invalidates any recorded current column.  */
  invalidate_current_column ();
  return Qnil;
}

Lisp_Object
save_restriction_save (void)
{
  if (BEGV == BEG && ZV == Z)
    /* The common case that the buffer isn't narrowed.
       We return just the buffer object, which save_restriction_restore
       recognizes as meaning `no restriction'.  */
    return Fcurrent_buffer ();
  else
    /* We have to save a restriction, so return a pair of markers, one
       for the beginning and one for the end.  */
    {
      Lisp_Object beg, end;

      beg = build_marker (current_buffer, BEGV, BEGV_BYTE);
      end = build_marker (current_buffer, ZV, ZV_BYTE);

      /* END must move forward if text is inserted at its exact location.  */
      XMARKER (end)->insertion_type = 1;

      return Fcons (beg, end);
    }
}

void
save_restriction_restore (Lisp_Object data)
{
  struct buffer *cur = NULL;
  struct buffer *buf = (CONSP (data)
			? XMARKER (XCAR (data))->buffer
			: XBUFFER (data));

  if (buf && buf != current_buffer && !NILP (BVAR (buf, pt_marker)))
    { /* If `buf' uses markers to keep track of PT, BEGV, and ZV (as
	 is the case if it is or has an indirect buffer), then make
	 sure it is current before we update BEGV, so
	 set_buffer_internal takes care of managing those markers.  */
      cur = current_buffer;
      set_buffer_internal (buf);
    }

  if (CONSP (data))
    /* A pair of marks bounding a saved restriction.  */
    {
      struct Lisp_Marker *beg = XMARKER (XCAR (data));
      struct Lisp_Marker *end = XMARKER (XCDR (data));
      eassert (buf == end->buffer);

      if (buf /* Verify marker still points to a buffer.  */
	  && (beg->charpos != BUF_BEGV (buf) || end->charpos != BUF_ZV (buf)))
	/* The restriction has changed from the saved one, so restore
	   the saved restriction.  */
	{
	  ptrdiff_t pt = BUF_PT (buf);

	  SET_BUF_BEGV_BOTH (buf, beg->charpos, beg->bytepos);
	  SET_BUF_ZV_BOTH (buf, end->charpos, end->bytepos);

	  if (pt < beg->charpos || pt > end->charpos)
	    /* The point is outside the new visible range, move it inside. */
	    SET_BUF_PT_BOTH (buf,
			     clip_to_bounds (beg->charpos, pt, end->charpos),
			     clip_to_bounds (beg->bytepos, BUF_PT_BYTE (buf),
					     end->bytepos));

	  buf->clip_changed = 1; /* Remember that the narrowing changed. */
	}
      /* These aren't needed anymore, so don't wait for GC.  */
      free_marker (XCAR (data));
      free_marker (XCDR (data));
      free_cons (XCONS (data));
    }
  else
    /* A buffer, which means that there was no old restriction.  */
    {
      if (buf /* Verify marker still points to a buffer.  */
	  && (BUF_BEGV (buf) != BUF_BEG (buf) || BUF_ZV (buf) != BUF_Z (buf)))
	/* The buffer has been narrowed, get rid of the narrowing.  */
	{
	  SET_BUF_BEGV_BOTH (buf, BUF_BEG (buf), BUF_BEG_BYTE (buf));
	  SET_BUF_ZV_BOTH (buf, BUF_Z (buf), BUF_Z_BYTE (buf));

	  buf->clip_changed = 1; /* Remember that the narrowing changed. */
	}
    }

  /* Changing the buffer bounds invalidates any recorded current column.  */
  invalidate_current_column ();

  if (cur)
    set_buffer_internal (cur);
}

DEFUN ("save-restriction", Fsave_restriction, Ssave_restriction, 0, UNEVALLED, 0,
       doc: /* Execute BODY, saving and restoring current buffer's restrictions.
The buffer's restrictions make parts of the beginning and end invisible.
\(They are set up with `narrow-to-region' and eliminated with `widen'.)
This special form, `save-restriction', saves the current buffer's restrictions
when it is entered, and restores them when it is exited.
So any `narrow-to-region' within BODY lasts only until the end of the form.
The old restrictions settings are restored
even in case of abnormal exit (throw or error).

The value returned is the value of the last form in BODY.

Note: if you are using both `save-excursion' and `save-restriction',
use `save-excursion' outermost:
    (save-excursion (save-restriction ...))

usage: (save-restriction &rest BODY)  */)
  (Lisp_Object body)
{
  register Lisp_Object val;
  ptrdiff_t count = SPECPDL_INDEX ();

  record_unwind_protect (save_restriction_restore, save_restriction_save ());
  val = Fprogn (body);
  return unbind_to (count, val);
}
\f
DEFUN ("message", Fmessage, Smessage, 1, MANY, 0,
       doc: /* Display a message at the bottom of the screen.
The message also goes into the `*Messages*' buffer, if `message-log-max'
is non-nil.  (In keyboard macros, that's all it does.)
Return the message.

In batch mode, the message is printed to the standard error stream,
followed by a newline.

The first argument is a format control string, and the rest are data
to be formatted under control of the string.  Percent sign (%), grave
accent (\\=`) and apostrophe (\\=') are special in the format; see
`format-message' for details.  To display STRING without special
treatment, use (message "%s" STRING).

If the first argument is nil or the empty string, the function clears
any existing message; this lets the minibuffer contents show.  See
also `current-message'.

usage: (message FORMAT-STRING &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  if (NILP (args[0])
      || (STRINGP (args[0])
	  && SBYTES (args[0]) == 0))
    {
      message1 (0);
      return args[0];
    }
  else
    {
      Lisp_Object val = Fformat_message (nargs, args);
      message3 (val);
      return val;
    }
}

DEFUN ("message-box", Fmessage_box, Smessage_box, 1, MANY, 0,
       doc: /* Display a message, in a dialog box if possible.
If a dialog box is not available, use the echo area.
The first argument is a format control string, and the rest are data
to be formatted under control of the string.  See `format-message' for
details.

If the first argument is nil or the empty string, clear any existing
message; let the minibuffer contents show.

usage: (message-box FORMAT-STRING &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  if (NILP (args[0]))
    {
      message1 (0);
      return Qnil;
    }
  else
    {
      Lisp_Object val = Fformat_message (nargs, args);
      Lisp_Object pane, menu;

      pane = list1 (Fcons (build_string ("OK"), Qt));
      menu = Fcons (val, pane);
      Fx_popup_dialog (Qt, menu, Qt);
      return val;
    }
}

DEFUN ("message-or-box", Fmessage_or_box, Smessage_or_box, 1, MANY, 0,
       doc: /* Display a message in a dialog box or in the echo area.
If this command was invoked with the mouse, use a dialog box if
`use-dialog-box' is non-nil.
Otherwise, use the echo area.
The first argument is a format control string, and the rest are data
to be formatted under control of the string.  See `format-message' for
details.

If the first argument is nil or the empty string, clear any existing
message; let the minibuffer contents show.

usage: (message-or-box FORMAT-STRING &rest ARGS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  if ((NILP (last_nonmenu_event) || CONSP (last_nonmenu_event))
      && use_dialog_box)
    return Fmessage_box (nargs, args);
  return Fmessage (nargs, args);
}

DEFUN ("current-message", Fcurrent_message, Scurrent_message, 0, 0, 0,
       doc: /* Return the string currently displayed in the echo area, or nil if none.  */)
  (void)
{
  return current_message ();
}


DEFUN ("propertize", Fpropertize, Spropertize, 1, MANY, 0,
       doc: /* Return a copy of STRING with text properties added.
First argument is the string to copy.
Remaining arguments form a sequence of PROPERTY VALUE pairs for text
properties to add to the result.
usage: (propertize STRING &rest PROPERTIES)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  Lisp_Object properties, string;
  ptrdiff_t i;

  /* Number of args must be odd.  */
  if ((nargs & 1) == 0)
    error ("Wrong number of arguments");

  properties = string = Qnil;

  /* First argument must be a string.  */
  CHECK_STRING (args[0]);
  string = Fcopy_sequence (args[0]);

  for (i = 1; i < nargs; i += 2)
    properties = Fcons (args[i], Fcons (args[i + 1], properties));

  Fadd_text_properties (make_number (0),
			make_number (SCHARS (string)),
			properties, string);
  return string;
}

/* Convert the prefix of STR from ASCII decimal digits to a number.
   Set *STR_END to the address of the first non-digit.  Return the
   number, or PTRDIFF_MAX on overflow.  Return 0 if there is no number.
   This is like strtol for ptrdiff_t and base 10 and C locale,
   except without negative numbers or errno.  */

static ptrdiff_t
str2num (char *str, char **str_end)
{
  ptrdiff_t n = 0;
  for (; c_isdigit (*str); str++)
    if (INT_MULTIPLY_WRAPV (n, 10, &n) || INT_ADD_WRAPV (n, *str - '0', &n))
      n = PTRDIFF_MAX;
  *str_end = str;
  return n;
}

DEFUN ("format", Fformat, Sformat, 1, MANY, 0,
       doc: /* Format a string out of a format-string and arguments.
The first argument is a format control string.
The other arguments are substituted into it to make the result, a string.

The format control string may contain %-sequences meaning to substitute
the next available argument, or the argument explicitly specified:

%s means print a string argument.  Actually, prints any object, with `princ'.
%d means print as signed number in decimal.
%o means print as unsigned number in octal, %x as unsigned number in hex.
%X is like %x, but uses upper case.
%e means print a number in exponential notation.
%f means print a number in decimal-point notation.
%g means print a number in exponential notation if the exponent would be
   less than -4 or greater than or equal to the precision (default: 6);
   otherwise it prints in decimal-point notation.
%c means print a number as a single character.
%S means print any object as an s-expression (using `prin1').

The argument used for %d, %o, %x, %e, %f, %g or %c must be a number.
Use %% to put a single % into the output.

A %-sequence other than %% may contain optional field number, flag,
width, and precision specifiers, as follows:

  %<field><flags><width><precision>character

where field is [0-9]+ followed by a literal dollar "$", flags is
[+ #-0]+, width is [0-9]+, and precision is a literal period "."
followed by [0-9]+.

If a %-sequence is numbered with a field with positive value N, the
Nth argument is substituted instead of the next one.  A format can
contain either numbered or unnumbered %-sequences but not both, except
that %% can be mixed with numbered %-sequences.

The + flag character inserts a + before any positive number, while a
space inserts a space before any positive number; these flags only
affect %d, %e, %f, and %g sequences, and the + flag takes precedence.
The - and 0 flags affect the width specifier, as described below.

The # flag means to use an alternate display form for %o, %x, %X, %e,
%f, and %g sequences: for %o, it ensures that the result begins with
\"0\"; for %x and %X, it prefixes the result with \"0x\" or \"0X\";
for %e and %f, it causes a decimal point to be included even if the
the precision is zero; for %g, it causes a decimal point to be
included even if the the precision is zero, and also forces trailing
zeros after the decimal point to be left in place.

The width specifier supplies a lower limit for the length of the
printed representation.  The padding, if any, normally goes on the
left, but it goes on the right if the - flag is present.  The padding
character is normally a space, but it is 0 if the 0 flag is present.
The 0 flag is ignored if the - flag is present, or the format sequence
is something other than %d, %e, %f, and %g.

For %e and %f sequences, the number after the "." in the precision
specifier says how many decimal places to show; if zero, the decimal
point itself is omitted.  For %g, the precision specifies how many
significant digits to print; zero or omitted are treated as 1.
For %s and %S, the precision specifier truncates the string to the
given width.

Text properties, if any, are copied from the format-string to the
produced text.

usage: (format STRING &rest OBJECTS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  return styled_format (nargs, args, false);
}

DEFUN ("format-message", Fformat_message, Sformat_message, 1, MANY, 0,
       doc: /* Format a string out of a format-string and arguments.
The first argument is a format control string.
The other arguments are substituted into it to make the result, a string.

This acts like `format', except it also replaces each grave accent (\\=`)
by a left quote, and each apostrophe (\\=') by a right quote.  The left
and right quote replacement characters are specified by
`text-quoting-style'.

usage: (format-message STRING &rest OBJECTS)  */)
  (ptrdiff_t nargs, Lisp_Object *args)
{
  return styled_format (nargs, args, true);
}

/* Implement ‘format-message’ if MESSAGE is true, ‘format’ otherwise.  */

static Lisp_Object
styled_format (ptrdiff_t nargs, Lisp_Object *args, bool message)
{
  ptrdiff_t n;		/* The number of the next arg to substitute.  */
  char initial_buffer[4000];
  char *buf = initial_buffer;
  ptrdiff_t bufsize = sizeof initial_buffer;
  ptrdiff_t max_bufsize = STRING_BYTES_BOUND + 1;
  char *p;
  ptrdiff_t buf_save_value_index UNINIT;
  char *format, *end;
  ptrdiff_t nchars;
  /* When we make a multibyte string, we must pay attention to the
     byte combining problem, i.e., a byte may be combined with a
     multibyte character of the previous string.  This flag tells if we
     must consider such a situation or not.  */
  bool maybe_combine_byte;
  bool arg_intervals = false;
  USE_SAFE_ALLOCA;
  sa_avail -= sizeof initial_buffer;

  /* Information recorded for each format spec.  */
  struct info
  {
    /* The corresponding argument, converted to string if conversion
       was needed.  */
    Lisp_Object argument;

    /* The start and end bytepos in the output string.  */
    ptrdiff_t start, end;

    /* Whether the argument is a string with intervals.  */
    bool_bf intervals : 1;
  } *info;

  CHECK_STRING (args[0]);
  char *format_start = SSDATA (args[0]);
  bool multibyte_format = STRING_MULTIBYTE (args[0]);
  ptrdiff_t formatlen = SBYTES (args[0]);

  /* Upper bound on number of format specs.  Each uses at least 2 chars.  */
  ptrdiff_t nspec_bound = SCHARS (args[0]) >> 1;

  /* Allocate the info and discarded tables.  */
  ptrdiff_t alloca_size;
  if (INT_MULTIPLY_WRAPV (nspec_bound, sizeof *info, &alloca_size)
      || INT_ADD_WRAPV (formatlen, alloca_size, &alloca_size)
      || SIZE_MAX < alloca_size)
    memory_full (SIZE_MAX);
  info = SAFE_ALLOCA (alloca_size);
  /* discarded[I] is 1 if byte I of the format
     string was not copied into the output.
     It is 2 if byte I was not the first byte of its character.  */
  char *discarded = (char *) &info[nspec_bound];
  memset (discarded, 0, formatlen);

  /* Try to determine whether the result should be multibyte.
     This is not always right; sometimes the result needs to be multibyte
     because of an object that we will pass through prin1.
     or because a grave accent or apostrophe is requoted,
     and in that case, we won't know it here.  */

  /* True if the output should be a multibyte string,
     which is true if any of the inputs is one.  */
  bool multibyte = multibyte_format;
  for (ptrdiff_t i = 1; !multibyte && i < nargs; i++)
    if (STRINGP (args[i]) && STRING_MULTIBYTE (args[i]))
      multibyte = true;

  int quoting_style = message ? text_quoting_style () : -1;

  ptrdiff_t ispec;
  ptrdiff_t nspec = 0;

  /* If we start out planning a unibyte result,
     then discover it has to be multibyte, we jump back to retry.  */
 retry:

  p = buf;
  nchars = 0;

  /* N is the argument index, ISPEC is the specification index.  */
  n = 0;
  ispec = 0;

  /* Scan the format and store result in BUF.  */
  format = format_start;
  end = format + formatlen;
  maybe_combine_byte = false;

  while (format != end)
    {
      /* The values of N, ISPEC, and FORMAT when the loop body is
         entered.  */
      ptrdiff_t n0 = n;
      ptrdiff_t ispec0 = ispec;
      char *format0 = format;
      char const *convsrc = format;
      unsigned char format_char = *format++;

      /* Bytes needed to represent the output of this conversion.  */
      ptrdiff_t convbytes = 1;

      if (format_char == '%')
	{
	  /* General format specifications look like

	     '%' [field-number] [flags] [field-width] [precision] format

	     where

             field-number ::= [0-9]+ '$'
	     flags ::= [-+0# ]+
	     field-width ::= [0-9]+
	     precision ::= '.' [0-9]*

	     If present, a field-number specifies the argument number
	     to substitute.  Otherwise, the next argument is taken.

	     If a field-width is specified, it specifies to which width
	     the output should be padded with blanks, if the output
	     string is shorter than field-width.

	     If precision is specified, it specifies the number of
	     digits to print after the '.' for floats, or the max.
	     number of chars to print from a string.  */

	  ptrdiff_t num;
	  char *num_end;
	  if (c_isdigit (*format))
	    {
	      num = str2num (format, &num_end);
	      if (*num_end == '$')
		{
		  n = num - 1;
		  format = num_end + 1;
		}
	    }

	  bool minus_flag = false;
	  bool  plus_flag = false;
	  bool space_flag = false;
	  bool sharp_flag = false;
	  bool  zero_flag = false;

	  for (; ; format++)
	    {
	      switch (*format)
		{
		case '-': minus_flag = true; continue;
		case '+':  plus_flag = true; continue;
		case ' ': space_flag = true; continue;
		case '#': sharp_flag = true; continue;
		case '0':  zero_flag = true; continue;
		}
	      break;
	    }

	  /* Ignore flags when sprintf ignores them.  */
	  space_flag &= ! plus_flag;
	  zero_flag &= ! minus_flag;

	  num = str2num (format, &num_end);
	  if (max_bufsize <= num)
	    string_overflow ();
	  ptrdiff_t field_width = num;

	  bool precision_given = *num_end == '.';
	  ptrdiff_t precision = (precision_given
				 ? str2num (num_end + 1, &num_end)
				 : PTRDIFF_MAX);
	  format = num_end;

	  if (format == end)
	    error ("Format string ends in middle of format specifier");

	  char conversion = *format++;
	  memset (&discarded[format0 - format_start], 1,
		  format - format0 - (conversion == '%'));
	  if (conversion == '%')
	    goto copy_char;

	  ++n;
	  if (! (n < nargs))
	    error ("Not enough arguments for format string");

	  struct info *spec = &info[ispec++];
	  if (nspec < ispec)
	    {
	      spec->argument = args[n];
	      spec->intervals = false;
	      nspec = ispec;
	    }
	  Lisp_Object arg = spec->argument;

	  /* For 'S', prin1 the argument, and then treat like 's'.
	     For 's', princ any argument that is not a string or
	     symbol.  But don't do this conversion twice, which might
	     happen after retrying.  */
	  if ((conversion == 'S'
	       || (conversion == 's'
		   && ! STRINGP (arg) && ! SYMBOLP (arg))))
	    {
	      if (EQ (arg, args[n]))
		{
		  Lisp_Object noescape = conversion == 'S' ? Qnil : Qt;
		  spec->argument = arg = Fprin1_to_string (arg, noescape);
		  if (STRING_MULTIBYTE (arg) && ! multibyte)
		    {
		      multibyte = true;
		      goto retry;
		    }
		}
	      conversion = 's';
	    }
	  else if (conversion == 'c')
	    {
	      if (INTEGERP (arg) && ! ASCII_CHAR_P (XINT (arg)))
		{
		  if (!multibyte)
		    {
		      multibyte = true;
		      goto retry;
		    }
		  spec->argument = arg = Fchar_to_string (arg);
		}

	      if (!EQ (arg, args[n]))
		conversion = 's';
	      zero_flag = false;
	    }

	  if (SYMBOLP (arg))
	    {
	      spec->argument = arg = SYMBOL_NAME (arg);
	      if (STRING_MULTIBYTE (arg) && ! multibyte)
		{
		  multibyte = true;
		  goto retry;
		}
	    }

	  bool float_conversion
	    = conversion == 'e' || conversion == 'f' || conversion == 'g';

	  if (conversion == 's')
	    {
	      /* handle case (precision[n] >= 0) */

	      ptrdiff_t prec = -1;
	      if (precision_given)
		prec = precision;

	      /* lisp_string_width ignores a precision of 0, but GNU
		 libc functions print 0 characters when the precision
		 is 0.  Imitate libc behavior here.  Changing
		 lisp_string_width is the right thing, and will be
		 done, but meanwhile we work with it. */

	      ptrdiff_t width, nbytes;
	      ptrdiff_t nchars_string;
	      if (prec == 0)
		width = nchars_string = nbytes = 0;
	      else
		{
		  ptrdiff_t nch, nby;
		  width = lisp_string_width (arg, prec, &nch, &nby);
		  if (prec < 0)
		    {
		      nchars_string = SCHARS (arg);
		      nbytes = SBYTES (arg);
		    }
		  else
		    {
		      nchars_string = nch;
		      nbytes = nby;
		    }
		}

	      convbytes = nbytes;
	      if (convbytes && multibyte && ! STRING_MULTIBYTE (arg))
		convbytes = count_size_as_multibyte (SDATA (arg), nbytes);

	      ptrdiff_t padding
		= width < field_width ? field_width - width : 0;

	      if (max_bufsize - padding <= convbytes)
		string_overflow ();
	      convbytes += padding;
	      if (convbytes <= buf + bufsize - p)
		{
		  if (! minus_flag)
		    {
		      memset (p, ' ', padding);
		      p += padding;
		      nchars += padding;
		    }
		  spec->start = nchars;

		  if (p > buf
		      && multibyte
		      && !ASCII_CHAR_P (*((unsigned char *) p - 1))
		      && STRING_MULTIBYTE (arg)
		      && !CHAR_HEAD_P (SREF (arg, 0)))
		    maybe_combine_byte = true;

		  p += copy_text (SDATA (arg), (unsigned char *) p,
				  nbytes,
				  STRING_MULTIBYTE (arg), multibyte);

		  nchars += nchars_string;

		  if (minus_flag)
		    {
		      memset (p, ' ', padding);
		      p += padding;
		      nchars += padding;
		    }
		  spec->end = nchars;

		  /* If this argument has text properties, record where
		     in the result string it appears.  */
		  if (string_intervals (arg))
		    spec->intervals = arg_intervals = true;

		  continue;
		}
	    }
	  else if (! (conversion == 'c' || conversion == 'd'
		      || float_conversion || conversion == 'i'
		      || conversion == 'o' || conversion == 'x'
		      || conversion == 'X'))
	    error ("Invalid format operation %%%c",
		   STRING_CHAR ((unsigned char *) format - 1));
	  else if (! (INTEGERP (arg) || (FLOATP (arg) && conversion != 'c')))
	    error ("Format specifier doesn't match argument type");
	  else
	    {
	      enum
	      {
		/* Lower bound on the number of bits per
		   base-FLT_RADIX digit.  */
		DIG_BITS_LBOUND = FLT_RADIX < 16 ? 1 : 4,

		/* 1 if integers should be formatted as long doubles,
		   because they may be so large that there is a rounding
		   error when converting them to double, and long doubles
		   are wider than doubles.  */
		INT_AS_LDBL = (DIG_BITS_LBOUND * DBL_MANT_DIG < FIXNUM_BITS - 1
			       && DBL_MANT_DIG < LDBL_MANT_DIG),

		/* Maximum precision for a %f conversion such that the
		   trailing output digit might be nonzero.  Any precision
		   larger than this will not yield useful information.  */
		USEFUL_PRECISION_MAX =
		  ((1 - LDBL_MIN_EXP)
		   * (FLT_RADIX == 2 || FLT_RADIX == 10 ? 1
		      : FLT_RADIX == 16 ? 4
		      : -1)),

		/* Maximum number of bytes generated by any format, if
		   precision is no more than USEFUL_PRECISION_MAX.
		   On all practical hosts, %f is the worst case.  */
		SPRINTF_BUFSIZE =
		  sizeof "-." + (LDBL_MAX_10_EXP + 1) + USEFUL_PRECISION_MAX,

		/* Length of pM (that is, of pMd without the
		   trailing "d").  */
		pMlen = sizeof pMd - 2
	      };
	      verify (USEFUL_PRECISION_MAX > 0);

	      /* Avoid undefined behavior in underlying sprintf.  */
	      if (conversion == 'd' || conversion == 'i')
		sharp_flag = false;

	      /* Create the copy of the conversion specification, with
		 any width and precision removed, with ".*" inserted,
		 with "L" possibly inserted for floating-point formats,
		 and with pM inserted for integer formats.
		 At most two flags F can be specified at once.  */
	      char convspec[sizeof "%FF.*d" + max (INT_AS_LDBL, pMlen)];
	      {
		char *f = convspec;
		*f++ = '%';
		/* MINUS_FLAG and ZERO_FLAG are dealt with later.  */
		*f = '+'; f +=  plus_flag;
		*f = ' '; f += space_flag;
		*f = '#'; f += sharp_flag;
                *f++ = '.';
                *f++ = '*';
		if (float_conversion)
		  {
		    if (INT_AS_LDBL)
		      {
			*f = 'L';
			f += INTEGERP (arg);
		      }
		  }
		else if (conversion != 'c')
		  {
		    memcpy (f, pMd, pMlen);
		    f += pMlen;
		    zero_flag &= ! precision_given;
		  }
		*f++ = conversion;
		*f = '\0';
	      }

	      int prec = -1;
	      if (precision_given)
		prec = min (precision, USEFUL_PRECISION_MAX);

	      /* Use sprintf to format this number into sprintf_buf.  Omit
		 padding and excess precision, though, because sprintf limits
		 output length to INT_MAX.

		 There are four types of conversion: double, unsigned
		 char (passed as int), wide signed int, and wide
		 unsigned int.  Treat them separately because the
		 sprintf ABI is sensitive to which type is passed.  Be
		 careful about integer overflow, NaNs, infinities, and
		 conversions; for example, the min and max macros are
		 not suitable here.  */
	      char sprintf_buf[SPRINTF_BUFSIZE];
	      ptrdiff_t sprintf_bytes;
	      if (float_conversion)
		{
		  if (INT_AS_LDBL && INTEGERP (arg))
		    {
		      /* Although long double may have a rounding error if
			 DIG_BITS_LBOUND * LDBL_MANT_DIG < FIXNUM_BITS - 1,
			 it is more accurate than plain 'double'.  */
		      long double x = XINT (arg);
		      sprintf_bytes = sprintf (sprintf_buf, convspec, prec, x);
		    }
		  else
		    sprintf_bytes = sprintf (sprintf_buf, convspec, prec,
					     XFLOATINT (arg));
		}
	      else if (conversion == 'c')
		{
		  /* Don't use sprintf here, as it might mishandle prec.  */
		  sprintf_buf[0] = XINT (arg);
		  sprintf_bytes = prec != 0;
		}
	      else if (conversion == 'd' || conversion == 'i')
		{
		  /* For float, maybe we should use "%1.0f"
		     instead so it also works for values outside
		     the integer range.  */
		  printmax_t x;
		  if (INTEGERP (arg))
		    x = XINT (arg);
		  else
		    {
		      double d = XFLOAT_DATA (arg);
		      if (d < 0)
			{
			  x = TYPE_MINIMUM (printmax_t);
			  if (x < d)
			    x = d;
			}
		      else
			{
			  x = TYPE_MAXIMUM (printmax_t);
			  if (d < x)
			    x = d;
			}
		    }
		  sprintf_bytes = sprintf (sprintf_buf, convspec, prec, x);
		}
	      else
		{
		  /* Don't sign-extend for octal or hex printing.  */
		  uprintmax_t x;
		  if (INTEGERP (arg))
		    x = XUINT (arg);
		  else
		    {
		      double d = XFLOAT_DATA (arg);
		      if (d < 0)
			x = 0;
		      else
			{
			  x = TYPE_MAXIMUM (uprintmax_t);
			  if (d < x)
			    x = d;
			}
		    }
		  sprintf_bytes = sprintf (sprintf_buf, convspec, prec, x);
		}

	      /* Now the length of the formatted item is known, except it omits
		 padding and excess precision.  Deal with excess precision
		 first.  This happens only when the format specifies
		 ridiculously large precision.  */
	      ptrdiff_t excess_precision
		= precision_given ? precision - prec : 0;
	      ptrdiff_t leading_zeros = 0, trailing_zeros = 0;
	      if (excess_precision)
		{
		  if (float_conversion)
		    {
		      if ((conversion == 'g' && ! sharp_flag)
			  || ! ('0' <= sprintf_buf[sprintf_bytes - 1]
				&& sprintf_buf[sprintf_bytes - 1] <= '9'))
			excess_precision = 0;
		      else
			{
			  if (conversion == 'g')
			    {
			      char *dot = strchr (sprintf_buf, '.');
			      if (!dot)
				excess_precision = 0;
			    }
			}
		      trailing_zeros = excess_precision;
		    }
		  else
		    leading_zeros = excess_precision;
		}

	      /* Compute the total bytes needed for this item, including
		 excess precision and padding.  */
	      ptrdiff_t numwidth;
	      if (INT_ADD_WRAPV (sprintf_bytes, excess_precision, &numwidth))
		numwidth = PTRDIFF_MAX;
	      ptrdiff_t padding
		= numwidth < field_width ? field_width - numwidth : 0;
	      if (max_bufsize - sprintf_bytes <= excess_precision
		  || max_bufsize - padding <= numwidth)
		string_overflow ();
	      convbytes = numwidth + padding;

	      if (convbytes <= buf + bufsize - p)
		{
		  /* Copy the formatted item from sprintf_buf into buf,
		     inserting padding and excess-precision zeros.  */

                  char *src = sprintf_buf;
		  char src0 = src[0];
		  int exponent_bytes = 0;
		  bool signedp = src0 == '-' || src0 == '+' || src0 == ' ';
		  unsigned char after_sign = src[signedp];
		  if (zero_flag && 0 <= char_hexdigit (after_sign))
		    {
		      leading_zeros += padding;
		      padding = 0;
		    }

		  if (excess_precision
		      && (conversion == 'e' || conversion == 'g'))
		    {
		      char *e = strchr (src, 'e');
		      if (e)
			exponent_bytes = src + sprintf_bytes - e;
		    }

		  spec->start = nchars;
		  if (! minus_flag)
		    {
		      memset (p, ' ', padding);
		      p += padding;
		      nchars += padding;
		    }

		  *p = src0;
		  src += signedp;
		  p += signedp;
		  memset (p, '0', leading_zeros);
		  p += leading_zeros;
		  int significand_bytes
		    = sprintf_bytes - signedp - exponent_bytes;
		  memcpy (p, src, significand_bytes);
                  p += significand_bytes;
		  src += significand_bytes;
		  memset (p, '0', trailing_zeros);
		  p += trailing_zeros;
		  memcpy (p, src, exponent_bytes);
		  p += exponent_bytes;

		  nchars += leading_zeros + sprintf_bytes + trailing_zeros;

		  if (minus_flag)
		    {
		      memset (p, ' ', padding);
		      p += padding;
		      nchars += padding;
		    }
		  spec->end = nchars;

		  continue;
		}
	    }
	}
      else
	{
	  unsigned char str[MAX_MULTIBYTE_LENGTH];

	  if ((format_char == '`' || format_char == '\'')
	      && quoting_style == CURVE_QUOTING_STYLE)
	    {
	      if (! multibyte)
		{
		  multibyte = true;
		  goto retry;
		}
	      convsrc = format_char == '`' ? uLSQM : uRSQM;
	      convbytes = 3;
	    }
	  else if (format_char == '`' && quoting_style == STRAIGHT_QUOTING_STYLE)
	    convsrc = "'";
	  else
	    {
	      /* Copy a single character from format to buf.  */
	      if (multibyte_format)
		{
		  /* Copy a whole multibyte character.  */
		  if (p > buf
		      && !ASCII_CHAR_P (*((unsigned char *) p - 1))
		      && !CHAR_HEAD_P (format_char))
		    maybe_combine_byte = true;

		  while (! CHAR_HEAD_P (*format))
		    format++;

		  convbytes = format - format0;
		  memset (&discarded[format0 + 1 - format_start], 2,
			  convbytes - 1);
		}
	      else if (multibyte && !ASCII_CHAR_P (format_char))
		{
		  int c = BYTE8_TO_CHAR (format_char);
		  convbytes = CHAR_STRING (c, str);
		  convsrc = (char *) str;
		}
	    }

	copy_char:
	  if (convbytes <= buf + bufsize - p)
	    {
	      memcpy (p, convsrc, convbytes);
	      p += convbytes;
	      nchars++;
	      continue;
	    }
	}

      /* There wasn't enough room to store this conversion or single
	 character.  CONVBYTES says how much room is needed.  Allocate
	 enough room (and then some) and do it again.  */

      ptrdiff_t used = p - buf;
      if (max_bufsize - used < convbytes)
	string_overflow ();
      bufsize = used + convbytes;
      bufsize = bufsize < max_bufsize / 2 ? bufsize * 2 : max_bufsize;

      if (buf == initial_buffer)
	{
	  buf = xmalloc (bufsize);
	  sa_must_free = true;
	  buf_save_value_index = SPECPDL_INDEX ();
	  record_unwind_protect_ptr (xfree, buf);
	  memcpy (buf, initial_buffer, used);
	}
      else
	{
	  buf = xrealloc (buf, bufsize);
	  set_unwind_protect_ptr (buf_save_value_index, xfree, buf);
	}

      p = buf + used;
      format = format0;
      n = n0;
      ispec = ispec0;
    }

  if (bufsize < p - buf)
    emacs_abort ();

  if (maybe_combine_byte)
    nchars = multibyte_chars_in_text ((unsigned char *) buf, p - buf);
  Lisp_Object val = make_specified_string (buf, nchars, p - buf, multibyte);

  /* If the format string has text properties, or any of the string
     arguments has text properties, set up text properties of the
     result string.  */

  if (string_intervals (args[0]) || arg_intervals)
    {
      /* Add text properties from the format string.  */
      Lisp_Object len = make_number (SCHARS (args[0]));
      Lisp_Object props = text_property_list (args[0], make_number (0),
					      len, Qnil);
      if (CONSP (props))
	{
	  ptrdiff_t bytepos = 0, position = 0, translated = 0;
	  ptrdiff_t fieldn = 0;

	  /* Adjust the bounds of each text property
	     to the proper start and end in the output string.  */

	  /* Put the positions in PROPS in increasing order, so that
	     we can do (effectively) one scan through the position
	     space of the format string.  */
	  props = Fnreverse (props);

	  /* BYTEPOS is the byte position in the format string,
	     POSITION is the untranslated char position in it,
	     TRANSLATED is the translated char position in BUF,
	     and ARGN is the number of the next arg we will come to.  */
	  for (Lisp_Object list = props; CONSP (list); list = XCDR (list))
	    {
	      Lisp_Object item = XCAR (list);

	      /* First adjust the property start position.  */
	      ptrdiff_t pos = XINT (XCAR (item));

	      /* Advance BYTEPOS, POSITION, TRANSLATED and ARGN
		 up to this position.  */
	      for (; position < pos; bytepos++)
		{
		  if (! discarded[bytepos])
		    position++, translated++;
		  else if (discarded[bytepos] == 1)
		    {
		      position++;
		      if (translated == info[fieldn].start)
			{
			  translated += info[fieldn].end - info[fieldn].start;
			  fieldn++;
			}
		    }
		}

	      XSETCAR (item, make_number (translated));

	      /* Likewise adjust the property end position.  */
	      pos = XINT (XCAR (XCDR (item)));

	      for (; position < pos; bytepos++)
		{
		  if (! discarded[bytepos])
		    position++, translated++;
		  else if (discarded[bytepos] == 1)
		    {
		      position++;
		      if (translated == info[fieldn].start)
			{
			  translated += info[fieldn].end - info[fieldn].start;
			  fieldn++;
			}
		    }
		}

	      XSETCAR (XCDR (item), make_number (translated));
	    }

	  add_text_properties_from_list (val, props, make_number (0));
	}

      /* Add text properties from arguments.  */
      if (arg_intervals)
	for (ptrdiff_t i = 0; i < nspec; i++)
	  if (info[i].intervals)
	    {
	      len = make_number (SCHARS (info[i].argument));
	      Lisp_Object new_len = make_number (info[i].end - info[i].start);
	      props = text_property_list (info[i].argument,
                                          make_number (0), len, Qnil);
	      props = extend_property_ranges (props, len, new_len);
	      /* If successive arguments have properties, be sure that
		 the value of `composition' property be the copy.  */
	      if (1 < i && info[i - 1].end)
		make_composition_value_copy (props);
	      add_text_properties_from_list (val, props,
					     make_number (info[i].start));
	    }
    }

  /* If we allocated BUF or INFO with malloc, free it too.  */
  SAFE_FREE ();

  return val;
}
\f
DEFUN ("char-equal", Fchar_equal, Schar_equal, 2, 2, 0,
       doc: /* Return t if two characters match, optionally ignoring case.
Both arguments must be characters (i.e. integers).
Case is ignored if `case-fold-search' is non-nil in the current buffer.  */)
  (register Lisp_Object c1, Lisp_Object c2)
{
  int i1, i2;
  /* Check they're chars, not just integers, otherwise we could get array
     bounds violations in downcase.  */
  CHECK_CHARACTER (c1);
  CHECK_CHARACTER (c2);

  if (XINT (c1) == XINT (c2))
    return Qt;
  if (NILP (BVAR (current_buffer, case_fold_search)))
    return Qnil;

  i1 = XFASTINT (c1);
  i2 = XFASTINT (c2);

  /* FIXME: It is possible to compare multibyte characters even when
     the current buffer is unibyte.  Unfortunately this is ambiguous
     for characters between 128 and 255, as they could be either
     eight-bit raw bytes or Latin-1 characters.  Assume the former for
     now.  See Bug#17011, and also see casefiddle.c's casify_object,
     which has a similar problem.  */
  if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
    {
      if (SINGLE_BYTE_CHAR_P (i1))
	i1 = UNIBYTE_TO_CHAR (i1);
      if (SINGLE_BYTE_CHAR_P (i2))
	i2 = UNIBYTE_TO_CHAR (i2);
    }

  return (downcase (i1) == downcase (i2) ? Qt :  Qnil);
}
\f
/* Transpose the markers in two regions of the current buffer, and
   adjust the ones between them if necessary (i.e.: if the regions
   differ in size).

   START1, END1 are the character positions of the first region.
   START1_BYTE, END1_BYTE are the byte positions.
   START2, END2 are the character positions of the second region.
   START2_BYTE, END2_BYTE are the byte positions.

   Traverses the entire marker list of the buffer to do so, adding an
   appropriate amount to some, subtracting from some, and leaving the
   rest untouched.  Most of this is copied from adjust_markers in insdel.c.

   It's the caller's job to ensure that START1 <= END1 <= START2 <= END2.  */

static void
transpose_markers (ptrdiff_t start1, ptrdiff_t end1,
		   ptrdiff_t start2, ptrdiff_t end2,
		   ptrdiff_t start1_byte, ptrdiff_t end1_byte,
		   ptrdiff_t start2_byte, ptrdiff_t end2_byte)
{
  register ptrdiff_t amt1, amt1_byte, amt2, amt2_byte, diff, diff_byte, mpos;
  register struct Lisp_Marker *marker;

  /* Update point as if it were a marker.  */
  if (PT < start1)
    ;
  else if (PT < end1)
    TEMP_SET_PT_BOTH (PT + (end2 - end1),
		      PT_BYTE + (end2_byte - end1_byte));
  else if (PT < start2)
    TEMP_SET_PT_BOTH (PT + (end2 - start2) - (end1 - start1),
		      (PT_BYTE + (end2_byte - start2_byte)
		       - (end1_byte - start1_byte)));
  else if (PT < end2)
    TEMP_SET_PT_BOTH (PT - (start2 - start1),
		      PT_BYTE - (start2_byte - start1_byte));

  /* We used to adjust the endpoints here to account for the gap, but that
     isn't good enough.  Even if we assume the caller has tried to move the
     gap out of our way, it might still be at start1 exactly, for example;
     and that places it `inside' the interval, for our purposes.  The amount
     of adjustment is nontrivial if there's a `denormalized' marker whose
     position is between GPT and GPT + GAP_SIZE, so it's simpler to leave
     the dirty work to Fmarker_position, below.  */

  /* The difference between the region's lengths */
  diff = (end2 - start2) - (end1 - start1);
  diff_byte = (end2_byte - start2_byte) - (end1_byte - start1_byte);

  /* For shifting each marker in a region by the length of the other
     region plus the distance between the regions.  */
  amt1 = (end2 - start2) + (start2 - end1);
  amt2 = (end1 - start1) + (start2 - end1);
  amt1_byte = (end2_byte - start2_byte) + (start2_byte - end1_byte);
  amt2_byte = (end1_byte - start1_byte) + (start2_byte - end1_byte);

  for (marker = BUF_MARKERS (current_buffer); marker; marker = marker->next)
    {
      mpos = marker->bytepos;
      if (mpos >= start1_byte && mpos < end2_byte)
	{
	  if (mpos < end1_byte)
	    mpos += amt1_byte;
	  else if (mpos < start2_byte)
	    mpos += diff_byte;
	  else
	    mpos -= amt2_byte;
	  marker->bytepos = mpos;
	}
      mpos = marker->charpos;
      if (mpos >= start1 && mpos < end2)
	{
	  if (mpos < end1)
	    mpos += amt1;
	  else if (mpos < start2)
	    mpos += diff;
	  else
	    mpos -= amt2;
	}
      marker->charpos = mpos;
    }
}

DEFUN ("transpose-regions", Ftranspose_regions, Stranspose_regions, 4, 5, 0,
       doc: /* Transpose region STARTR1 to ENDR1 with STARTR2 to ENDR2.
The regions should not be overlapping, because the size of the buffer is
never changed in a transposition.

Optional fifth arg LEAVE-MARKERS, if non-nil, means don't update
any markers that happen to be located in the regions.

Transposing beyond buffer boundaries is an error.  */)
  (Lisp_Object startr1, Lisp_Object endr1, Lisp_Object startr2, Lisp_Object endr2, Lisp_Object leave_markers)
{
  register ptrdiff_t start1, end1, start2, end2;
  ptrdiff_t start1_byte, start2_byte, len1_byte, len2_byte, end2_byte;
  ptrdiff_t gap, len1, len_mid, len2;
  unsigned char *start1_addr, *start2_addr, *temp;

  INTERVAL cur_intv, tmp_interval1, tmp_interval_mid, tmp_interval2, tmp_interval3;
  Lisp_Object buf;

  XSETBUFFER (buf, current_buffer);
  cur_intv = buffer_intervals (current_buffer);

  validate_region (&startr1, &endr1);
  validate_region (&startr2, &endr2);

  start1 = XFASTINT (startr1);
  end1 = XFASTINT (endr1);
  start2 = XFASTINT (startr2);
  end2 = XFASTINT (endr2);
  gap = GPT;

  /* Swap the regions if they're reversed.  */
  if (start2 < end1)
    {
      register ptrdiff_t glumph = start1;
      start1 = start2;
      start2 = glumph;
      glumph = end1;
      end1 = end2;
      end2 = glumph;
    }

  len1 = end1 - start1;
  len2 = end2 - start2;

  if (start2 < end1)
    error ("Transposed regions overlap");
  /* Nothing to change for adjacent regions with one being empty */
  else if ((start1 == end1 || start2 == end2) && end1 == start2)
    return Qnil;

  /* The possibilities are:
     1. Adjacent (contiguous) regions, or separate but equal regions
     (no, really equal, in this case!), or
     2. Separate regions of unequal size.

     The worst case is usually No. 2.  It means that (aside from
     potential need for getting the gap out of the way), there also
     needs to be a shifting of the text between the two regions.  So
     if they are spread far apart, we are that much slower... sigh.  */

  /* It must be pointed out that the really studly thing to do would
     be not to move the gap at all, but to leave it in place and work
     around it if necessary.  This would be extremely efficient,
     especially considering that people are likely to do
     transpositions near where they are working interactively, which
     is exactly where the gap would be found.  However, such code
     would be much harder to write and to read.  So, if you are
     reading this comment and are feeling squirrely, by all means have
     a go!  I just didn't feel like doing it, so I will simply move
     the gap the minimum distance to get it out of the way, and then
     deal with an unbroken array.  */

  start1_byte = CHAR_TO_BYTE (start1);
  end2_byte = CHAR_TO_BYTE (end2);

  /* Make sure the gap won't interfere, by moving it out of the text
     we will operate on.  */
  if (start1 < gap && gap < end2)
    {
      if (gap - start1 < end2 - gap)
	move_gap_both (start1, start1_byte);
      else
	move_gap_both (end2, end2_byte);
    }

  start2_byte = CHAR_TO_BYTE (start2);
  len1_byte = CHAR_TO_BYTE (end1) - start1_byte;
  len2_byte = end2_byte - start2_byte;

#ifdef BYTE_COMBINING_DEBUG
  if (end1 == start2)
    {
      if (count_combining_before (BYTE_POS_ADDR (start2_byte),
				  len2_byte, start1, start1_byte)
	  || count_combining_before (BYTE_POS_ADDR (start1_byte),
				     len1_byte, end2, start2_byte + len2_byte)
	  || count_combining_after (BYTE_POS_ADDR (start1_byte),
				    len1_byte, end2, start2_byte + len2_byte))
	emacs_abort ();
    }
  else
    {
      if (count_combining_before (BYTE_POS_ADDR (start2_byte),
				  len2_byte, start1, start1_byte)
	  || count_combining_before (BYTE_POS_ADDR (start1_byte),
				     len1_byte, start2, start2_byte)
	  || count_combining_after (BYTE_POS_ADDR (start2_byte),
				    len2_byte, end1, start1_byte + len1_byte)
	  || count_combining_after (BYTE_POS_ADDR (start1_byte),
				    len1_byte, end2, start2_byte + len2_byte))
	emacs_abort ();
    }
#endif

  /* Hmmm... how about checking to see if the gap is large
     enough to use as the temporary storage?  That would avoid an
     allocation... interesting.  Later, don't fool with it now.  */

  /* Working without memmove, for portability (sigh), so must be
     careful of overlapping subsections of the array...  */

  if (end1 == start2)		/* adjacent regions */
    {
      modify_text (start1, end2);
      record_change (start1, len1 + len2);

      tmp_interval1 = copy_intervals (cur_intv, start1, len1);
      tmp_interval2 = copy_intervals (cur_intv, start2, len2);
      /* Don't use Fset_text_properties: that can cause GC, which can
	 clobber objects stored in the tmp_intervals.  */
      tmp_interval3 = validate_interval_range (buf, &startr1, &endr2, 0);
      if (tmp_interval3)
	set_text_properties_1 (startr1, endr2, Qnil, buf, tmp_interval3);

      USE_SAFE_ALLOCA;

      /* First region smaller than second.  */
      if (len1_byte < len2_byte)
        {
	  temp = SAFE_ALLOCA (len2_byte);

	  /* Don't precompute these addresses.  We have to compute them
	     at the last minute, because the relocating allocator might
	     have moved the buffer around during the xmalloc.  */
	  start1_addr = BYTE_POS_ADDR (start1_byte);
	  start2_addr = BYTE_POS_ADDR (start2_byte);

          memcpy (temp, start2_addr, len2_byte);
          memcpy (start1_addr + len2_byte, start1_addr, len1_byte);
          memcpy (start1_addr, temp, len2_byte);
        }
      else
	/* First region not smaller than second.  */
        {
	  temp = SAFE_ALLOCA (len1_byte);
	  start1_addr = BYTE_POS_ADDR (start1_byte);
	  start2_addr = BYTE_POS_ADDR (start2_byte);
          memcpy (temp, start1_addr, len1_byte);
          memcpy (start1_addr, start2_addr, len2_byte);
          memcpy (start1_addr + len2_byte, temp, len1_byte);
        }

      SAFE_FREE ();
      graft_intervals_into_buffer (tmp_interval1, start1 + len2,
                                   len1, current_buffer, 0);
      graft_intervals_into_buffer (tmp_interval2, start1,
                                   len2, current_buffer, 0);
      update_compositions (start1, start1 + len2, CHECK_BORDER);
      update_compositions (start1 + len2, end2, CHECK_TAIL);
    }
  /* Non-adjacent regions, because end1 != start2, bleagh...  */
  else
    {
      len_mid = start2_byte - (start1_byte + len1_byte);

      if (len1_byte == len2_byte)
	/* Regions are same size, though, how nice.  */
        {
	  USE_SAFE_ALLOCA;

          modify_text (start1, end1);
          modify_text (start2, end2);
          record_change (start1, len1);
          record_change (start2, len2);
          tmp_interval1 = copy_intervals (cur_intv, start1, len1);
          tmp_interval2 = copy_intervals (cur_intv, start2, len2);

	  tmp_interval3 = validate_interval_range (buf, &startr1, &endr1, 0);
	  if (tmp_interval3)
	    set_text_properties_1 (startr1, endr1, Qnil, buf, tmp_interval3);

	  tmp_interval3 = validate_interval_range (buf, &startr2, &endr2, 0);
	  if (tmp_interval3)
	    set_text_properties_1 (startr2, endr2, Qnil, buf, tmp_interval3);

	  temp = SAFE_ALLOCA (len1_byte);
	  start1_addr = BYTE_POS_ADDR (start1_byte);
	  start2_addr = BYTE_POS_ADDR (start2_byte);
          memcpy (temp, start1_addr, len1_byte);
          memcpy (start1_addr, start2_addr, len2_byte);
          memcpy (start2_addr, temp, len1_byte);
	  SAFE_FREE ();

          graft_intervals_into_buffer (tmp_interval1, start2,
                                       len1, current_buffer, 0);
          graft_intervals_into_buffer (tmp_interval2, start1,
                                       len2, current_buffer, 0);
        }

      else if (len1_byte < len2_byte)	/* Second region larger than first */
        /* Non-adjacent & unequal size, area between must also be shifted.  */
        {
	  USE_SAFE_ALLOCA;

          modify_text (start1, end2);
          record_change (start1, (end2 - start1));
          tmp_interval1 = copy_intervals (cur_intv, start1, len1);
          tmp_interval_mid = copy_intervals (cur_intv, end1, len_mid);
          tmp_interval2 = copy_intervals (cur_intv, start2, len2);

	  tmp_interval3 = validate_interval_range (buf, &startr1, &endr2, 0);
	  if (tmp_interval3)
	    set_text_properties_1 (startr1, endr2, Qnil, buf, tmp_interval3);

	  /* holds region 2 */
	  temp = SAFE_ALLOCA (len2_byte);
	  start1_addr = BYTE_POS_ADDR (start1_byte);
	  start2_addr = BYTE_POS_ADDR (start2_byte);
          memcpy (temp, start2_addr, len2_byte);
          memcpy (start1_addr + len_mid + len2_byte, start1_addr, len1_byte);
          memmove (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
          memcpy (start1_addr, temp, len2_byte);
	  SAFE_FREE ();

          graft_intervals_into_buffer (tmp_interval1, end2 - len1,
                                       len1, current_buffer, 0);
          graft_intervals_into_buffer (tmp_interval_mid, start1 + len2,
                                       len_mid, current_buffer, 0);
          graft_intervals_into_buffer (tmp_interval2, start1,
                                       len2, current_buffer, 0);
        }
      else
	/* Second region smaller than first.  */
        {
	  USE_SAFE_ALLOCA;

          record_change (start1, (end2 - start1));
          modify_text (start1, end2);

          tmp_interval1 = copy_intervals (cur_intv, start1, len1);
          tmp_interval_mid = copy_intervals (cur_intv, end1, len_mid);
          tmp_interval2 = copy_intervals (cur_intv, start2, len2);

	  tmp_interval3 = validate_interval_range (buf, &startr1, &endr2, 0);
	  if (tmp_interval3)
	    set_text_properties_1 (startr1, endr2, Qnil, buf, tmp_interval3);

	  /* holds region 1 */
	  temp = SAFE_ALLOCA (len1_byte);
	  start1_addr = BYTE_POS_ADDR (start1_byte);
	  start2_addr = BYTE_POS_ADDR (start2_byte);
          memcpy (temp, start1_addr, len1_byte);
          memcpy (start1_addr, start2_addr, len2_byte);
          memmove (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
          memcpy (start1_addr + len2_byte + len_mid, temp, len1_byte);
	  SAFE_FREE ();

          graft_intervals_into_buffer (tmp_interval1, end2 - len1,
                                       len1, current_buffer, 0);
          graft_intervals_into_buffer (tmp_interval_mid, start1 + len2,
                                       len_mid, current_buffer, 0);
          graft_intervals_into_buffer (tmp_interval2, start1,
                                       len2, current_buffer, 0);
        }

      update_compositions (start1, start1 + len2, CHECK_BORDER);
      update_compositions (end2 - len1, end2, CHECK_BORDER);
    }

  /* When doing multiple transpositions, it might be nice
     to optimize this.  Perhaps the markers in any one buffer
     should be organized in some sorted data tree.  */
  if (NILP (leave_markers))
    {
      transpose_markers (start1, end1, start2, end2,
			 start1_byte, start1_byte + len1_byte,
			 start2_byte, start2_byte + len2_byte);
      fix_start_end_in_overlays (start1, end2);
    }
  else
    {
      /* The character positions of the markers remain intact, but we
	 still need to update their byte positions, because the
	 transposed regions might include multibyte sequences which
	 make some original byte positions of the markers invalid.  */
      adjust_markers_bytepos (start1, start1_byte, end2, end2_byte, 0);
    }

  signal_after_change (start1, end2 - start1, end2 - start1);
  return Qnil;
}

\f
void
syms_of_editfns (void)
{
  DEFSYM (Qbuffer_access_fontify_functions, "buffer-access-fontify-functions");
  DEFSYM (Qwall, "wall");

  DEFVAR_LISP ("inhibit-field-text-motion", Vinhibit_field_text_motion,
	       doc: /* Non-nil means text motion commands don't notice fields.  */);
  Vinhibit_field_text_motion = Qnil;

  DEFVAR_LISP ("buffer-access-fontify-functions",
	       Vbuffer_access_fontify_functions,
	       doc: /* List of functions called by `buffer-substring' to fontify if necessary.
Each function is called with two arguments which specify the range
of the buffer being accessed.  */);
  Vbuffer_access_fontify_functions = Qnil;

  {
    Lisp_Object obuf;
    obuf = Fcurrent_buffer ();
    /* Do this here, because init_buffer_once is too early--it won't work.  */
    Fset_buffer (Vprin1_to_string_buffer);
    /* Make sure buffer-access-fontify-functions is nil in this buffer.  */
    Fset (Fmake_local_variable (Qbuffer_access_fontify_functions), Qnil);
    Fset_buffer (obuf);
  }

  DEFVAR_LISP ("buffer-access-fontified-property",
	       Vbuffer_access_fontified_property,
	       doc: /* Property which (if non-nil) indicates text has been fontified.
`buffer-substring' need not call the `buffer-access-fontify-functions'
functions if all the text being accessed has this property.  */);
  Vbuffer_access_fontified_property = Qnil;

  DEFVAR_LISP ("system-name", Vsystem_name,
	       doc: /* The host name of the machine Emacs is running on.  */);
  Vsystem_name = cached_system_name = Qnil;

  DEFVAR_LISP ("user-full-name", Vuser_full_name,
	       doc: /* The full name of the user logged in.  */);

  DEFVAR_LISP ("user-login-name", Vuser_login_name,
	       doc: /* The user's name, taken from environment variables if possible.  */);
  Vuser_login_name = Qnil;

  DEFVAR_LISP ("user-real-login-name", Vuser_real_login_name,
	       doc: /* The user's name, based upon the real uid only.  */);

  DEFVAR_LISP ("operating-system-release", Voperating_system_release,
	       doc: /* The release of the operating system Emacs is running on.  */);

  defsubr (&Spropertize);
  defsubr (&Schar_equal);
  defsubr (&Sgoto_char);
  defsubr (&Sstring_to_char);
  defsubr (&Schar_to_string);
  defsubr (&Sbyte_to_string);
  defsubr (&Sbuffer_substring);
  defsubr (&Sbuffer_substring_no_properties);
  defsubr (&Sbuffer_string);
  defsubr (&Sget_pos_property);

  defsubr (&Spoint_marker);
  defsubr (&Smark_marker);
  defsubr (&Spoint);
  defsubr (&Sregion_beginning);
  defsubr (&Sregion_end);

  /* Symbol for the text property used to mark fields.  */
  DEFSYM (Qfield, "field");

  /* A special value for Qfield properties.  */
  DEFSYM (Qboundary, "boundary");

  defsubr (&Sfield_beginning);
  defsubr (&Sfield_end);
  defsubr (&Sfield_string);
  defsubr (&Sfield_string_no_properties);
  defsubr (&Sdelete_field);
  defsubr (&Sconstrain_to_field);

  defsubr (&Sline_beginning_position);
  defsubr (&Sline_end_position);

  defsubr (&Ssave_excursion);
  defsubr (&Ssave_current_buffer);

  defsubr (&Sbuffer_size);
  defsubr (&Spoint_max);
  defsubr (&Spoint_min);
  defsubr (&Spoint_min_marker);
  defsubr (&Spoint_max_marker);
  defsubr (&Sgap_position);
  defsubr (&Sgap_size);
  defsubr (&Sposition_bytes);
  defsubr (&Sbyte_to_position);

  defsubr (&Sbobp);
  defsubr (&Seobp);
  defsubr (&Sbolp);
  defsubr (&Seolp);
  defsubr (&Sfollowing_char);
  defsubr (&Sprevious_char);
  defsubr (&Schar_after);
  defsubr (&Schar_before);
  defsubr (&Sinsert);
  defsubr (&Sinsert_before_markers);
  defsubr (&Sinsert_and_inherit);
  defsubr (&Sinsert_and_inherit_before_markers);
  defsubr (&Sinsert_char);
  defsubr (&Sinsert_byte);

  defsubr (&Suser_login_name);
  defsubr (&Suser_real_login_name);
  defsubr (&Suser_uid);
  defsubr (&Suser_real_uid);
  defsubr (&Sgroup_gid);
  defsubr (&Sgroup_real_gid);
  defsubr (&Suser_full_name);
  defsubr (&Semacs_pid);
  defsubr (&Scurrent_time);
  defsubr (&Stime_add);
  defsubr (&Stime_subtract);
  defsubr (&Stime_less_p);
  defsubr (&Sget_internal_run_time);
  defsubr (&Sformat_time_string);
  defsubr (&Sfloat_time);
  defsubr (&Sdecode_time);
  defsubr (&Sencode_time);
  defsubr (&Scurrent_time_string);
  defsubr (&Scurrent_time_zone);
  defsubr (&Sset_time_zone_rule);
  defsubr (&Ssystem_name);
  defsubr (&Smessage);
  defsubr (&Smessage_box);
  defsubr (&Smessage_or_box);
  defsubr (&Scurrent_message);
  defsubr (&Sformat);
  defsubr (&Sformat_message);

  defsubr (&Sinsert_buffer_substring);
  defsubr (&Scompare_buffer_substrings);
  defsubr (&Sreplace_buffer_contents);
  defsubr (&Ssubst_char_in_region);
  defsubr (&Stranslate_region_internal);
  defsubr (&Sdelete_region);
  defsubr (&Sdelete_and_extract_region);
  defsubr (&Swiden);
  defsubr (&Snarrow_to_region);
  defsubr (&Ssave_restriction);
  defsubr (&Stranspose_regions);
}

debug log:

solving b03eb94 ...
found b03eb94 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).