unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 78820cb3a7c58cf5a09f0d422b7b1b7fdb70d29f 105309 bytes (raw)
name: src/xselect.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
 
/* X Selection processing for Emacs.
   Copyright (C) 1993-1997, 2000-2022 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/>.  */


/* Rewritten by jwz */

#include <config.h>
#include <limits.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include <unistd.h>

#include "lisp.h"
#include "xterm.h"	/* for all of the X includes */
#include "frame.h"	/* Need this to get the X window of selected_frame */
#include "blockinput.h"
#include "sysstdio.h"	/* TRACE_SELECTION needs this.  */
#include "termhooks.h"
#include "keyboard.h"
#include "pdumper.h"
#include "atimer.h"

#include <X11/Xproto.h>

struct prop_location;
struct selection_data;

static void x_decline_selection_request (struct selection_input_event *);
static bool x_convert_selection (Lisp_Object, Lisp_Object, Atom, bool,
				 struct x_display_info *, bool);
static bool waiting_for_other_props_on_window (Display *, Window);
static struct prop_location *expect_property_change (Display *, Window,
                                                     Atom, int);
static void unexpect_property_change (struct prop_location *);
static void wait_for_property_change (struct prop_location *);
static Lisp_Object x_get_window_property_as_lisp_data (struct x_display_info *,
                                                       Window, Atom,
                                                       Lisp_Object, Atom, bool);
static Lisp_Object selection_data_to_lisp_data (struct x_display_info *,
						const unsigned char *,
						ptrdiff_t, Atom, int);
static void lisp_data_to_selection_data (struct x_display_info *, Lisp_Object,
					 struct selection_data *);
static void x_send_client_event (Lisp_Object, Lisp_Object, Lisp_Object,
				 Atom, Lisp_Object, Lisp_Object);

/* Printing traces to stderr.  */

#ifdef TRACE_SELECTION
#define TRACE0(fmt) \
  fprintf (stderr, "%"PRIdMAX": " fmt "\n", (intmax_t) getpid ())
#define TRACE1(fmt, a0) \
  fprintf (stderr, "%"PRIdMAX": " fmt "\n", (intmax_t) getpid (), a0)
#define TRACE2(fmt, a0, a1) \
  fprintf (stderr, "%"PRIdMAX": " fmt "\n", (intmax_t) getpid (), a0, a1)
#define TRACE3(fmt, a0, a1, a2) \
  fprintf (stderr, "%"PRIdMAX": " fmt "\n", (intmax_t) getpid (), a0, a1, a2)
#else
#define TRACE0(fmt)		(void) 0
#define TRACE1(fmt, a0)		(void) 0
#define TRACE2(fmt, a0, a1)	(void) 0
#define TRACE3(fmt, a0, a1, a2) (void) 0
#endif

/* Bytes needed to represent 'long' data.  This is as per libX11; it
   is not necessarily sizeof (long).  */
#define X_LONG_SIZE 4

/* If this is a smaller number than the max-request-size of the
   display, Emacs will use INCR selection transfer when the selection
   is larger than this.  The max-request-size is usually around 64k,
   so if you want emacs to use incremental selection transfers when
   the selection is smaller than that, set this.  I added this mostly
   for debugging the incremental transfer stuff, but it might improve
   server performance.

   This value cannot exceed INT_MAX / max (X_LONG_SIZE, sizeof (long))
   because it is multiplied by X_LONG_SIZE and by sizeof (long) in
   subscript calculations.  Similarly for PTRDIFF_MAX - 1 or SIZE_MAX
   - 1 in place of INT_MAX.  */
#define MAX_SELECTION_QUANTUM						\
  ((int) min (0xFFFFFF, (min (INT_MAX, min (PTRDIFF_MAX, SIZE_MAX) - 1)	\
			 / max (X_LONG_SIZE, sizeof (long)))))

static int
selection_quantum (Display *display)
{
  long mrs;

  mrs = XExtendedMaxRequestSize (display);

  if (!mrs)
    mrs = XMaxRequestSize (display);

  return (mrs < MAX_SELECTION_QUANTUM / X_LONG_SIZE + 25
	  ? (mrs - 25) * X_LONG_SIZE
	  : MAX_SELECTION_QUANTUM);
}

#define LOCAL_SELECTION(selection_symbol, dpyinfo)			\
  assq_no_quit (selection_symbol, dpyinfo->terminal->Vselection_alist)

\f

/* This converts a Lisp symbol to a server Atom, avoiding a server
   roundtrip whenever possible.  */

Atom
symbol_to_x_atom (struct x_display_info *dpyinfo, Lisp_Object sym)
{
  Atom val;
  if (NILP (sym))
    return 0;
  if (EQ (sym, QPRIMARY))
    return XA_PRIMARY;
  if (EQ (sym, QSECONDARY))
    return XA_SECONDARY;
  if (EQ (sym, QSTRING))
    return XA_STRING;
  if (EQ (sym, QINTEGER))
    return XA_INTEGER;
  if (EQ (sym, QATOM))
    return XA_ATOM;
  if (EQ (sym, QCLIPBOARD))
    return dpyinfo->Xatom_CLIPBOARD;
  if (EQ (sym, QTIMESTAMP))
    return dpyinfo->Xatom_TIMESTAMP;
  if (EQ (sym, QTEXT))
    return dpyinfo->Xatom_TEXT;
  if (EQ (sym, QCOMPOUND_TEXT))
    return dpyinfo->Xatom_COMPOUND_TEXT;
  if (EQ (sym, QUTF8_STRING))
    return dpyinfo->Xatom_UTF8_STRING;
  if (EQ (sym, QDELETE))
    return dpyinfo->Xatom_DELETE;
  if (EQ (sym, QMULTIPLE))
    return dpyinfo->Xatom_MULTIPLE;
  if (EQ (sym, QINCR))
    return dpyinfo->Xatom_INCR;
  if (EQ (sym, Q_EMACS_TMP_))
    return dpyinfo->Xatom_EMACS_TMP;
  if (EQ (sym, QTARGETS))
    return dpyinfo->Xatom_TARGETS;
  if (EQ (sym, QNULL))
    return dpyinfo->Xatom_NULL;
  if (EQ (sym, QXdndSelection))
    return dpyinfo->Xatom_XdndSelection;
  if (EQ (sym, QXmTRANSFER_SUCCESS))
    return dpyinfo->Xatom_XmTRANSFER_SUCCESS;
  if (EQ (sym, QXmTRANSFER_FAILURE))
    return dpyinfo->Xatom_XmTRANSFER_FAILURE;
  if (EQ (sym, QXdndDirectSave0))
    return dpyinfo->Xatom_XdndDirectSave0;
  if (EQ (sym, Qtext_plain))
    return dpyinfo->Xatom_text_plain;
  if (EQ (sym, QXdndActionDirectSave))
    return dpyinfo->Xatom_XdndActionDirectSave;

  if (!SYMBOLP (sym))
    emacs_abort ();

  TRACE1 (" XInternAtom %s", SSDATA (SYMBOL_NAME (sym)));
  block_input ();
  val = x_intern_cached_atom (dpyinfo, SSDATA (SYMBOL_NAME (sym)), false);
  unblock_input ();
  return val;
}


/* This converts a server Atom to a Lisp symbol, avoiding server roundtrips
   and calls to intern whenever possible.  */

Lisp_Object
x_atom_to_symbol (struct x_display_info *dpyinfo, Atom atom)
{
  char *str;
  Lisp_Object val;

  if (! atom)
    return Qnil;

  switch (atom)
    {
    case XA_PRIMARY:
      return QPRIMARY;
    case XA_SECONDARY:
      return QSECONDARY;
    case XA_STRING:
      return QSTRING;
    case XA_INTEGER:
      return QINTEGER;
    case XA_ATOM:
      return QATOM;
    }

  if (dpyinfo == NULL)
    return Qnil;
  if (atom == dpyinfo->Xatom_CLIPBOARD)
    return QCLIPBOARD;
  if (atom == dpyinfo->Xatom_TIMESTAMP)
    return QTIMESTAMP;
  if (atom == dpyinfo->Xatom_TEXT)
    return QTEXT;
  if (atom == dpyinfo->Xatom_COMPOUND_TEXT)
    return QCOMPOUND_TEXT;
  if (atom == dpyinfo->Xatom_UTF8_STRING)
    return QUTF8_STRING;
  if (atom == dpyinfo->Xatom_DELETE)
    return QDELETE;
  if (atom == dpyinfo->Xatom_MULTIPLE)
    return QMULTIPLE;
  if (atom == dpyinfo->Xatom_INCR)
    return QINCR;
  if (atom == dpyinfo->Xatom_EMACS_TMP)
    return Q_EMACS_TMP_;
  if (atom == dpyinfo->Xatom_TARGETS)
    return QTARGETS;
  if (atom == dpyinfo->Xatom_NULL)
    return QNULL;
  if (atom == dpyinfo->Xatom_XdndSelection)
    return QXdndSelection;
  if (atom == dpyinfo->Xatom_XmTRANSFER_SUCCESS)
    return QXmTRANSFER_SUCCESS;
  if (atom == dpyinfo->Xatom_XmTRANSFER_FAILURE)
    return QXmTRANSFER_FAILURE;
  if (atom == dpyinfo->Xatom_XdndDirectSave0)
    return QXdndDirectSave0;
  if (atom == dpyinfo->Xatom_text_plain)
    return Qtext_plain;
  if (atom == dpyinfo->Xatom_XdndActionDirectSave)
    return QXdndActionDirectSave;

  x_catch_errors (dpyinfo->display);
  str = x_get_atom_name (dpyinfo, atom, NULL);
  x_uncatch_errors ();

  TRACE0 ("XGetAtomName --> NULL");
  if (!str)
    return Qnil;
  TRACE1 ("XGetAtomName --> %s", str);

  val = intern (str);
  xfree (str);
  return val;
}
\f
/* Do protocol to assert ourself as a selection owner.
   FRAME shall be the owner; it must be a valid X frame.
   TIMESTAMP should be the timestamp where selection ownership will be
   assumed.
   DND_DATA is the local value that will be used for selection requests
   with `dpyinfo->pending_dnd_time'.
   Update the Vselection_alist so that we can reply to later requests for
   our selection.  */

void
x_own_selection (Lisp_Object selection_name, Lisp_Object selection_value,
		 Lisp_Object frame, Lisp_Object dnd_data, Time timestamp)
{
  struct frame *f = XFRAME (frame);
  Window selecting_window = FRAME_X_WINDOW (f);
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
  Display *display = dpyinfo->display;
  Atom selection_atom = symbol_to_x_atom (dpyinfo, selection_name);

  if (!timestamp)
    timestamp = dpyinfo->last_user_time;

  block_input ();
  XSetSelectionOwner (display, selection_atom, selecting_window,
		      timestamp);
  unblock_input ();

  /* Now update the local cache */
  {
    Lisp_Object selection_data;
    Lisp_Object prev_value;

    selection_data = list5 (selection_name, selection_value,
			    INT_TO_INTEGER (timestamp), frame,
			    dnd_data);
    prev_value = LOCAL_SELECTION (selection_name, dpyinfo);

    tset_selection_alist
      (dpyinfo->terminal,
       Fcons (selection_data, dpyinfo->terminal->Vselection_alist));

    /* If we already owned the selection, remove the old selection
       data.  Don't use Fdelq as that may quit.  */
    if (!NILP (prev_value))
      {
	/* We know it's not the CAR, so it's easy.  */
	Lisp_Object rest = dpyinfo->terminal->Vselection_alist;
	for (; CONSP (rest); rest = XCDR (rest))
	  if (EQ (prev_value, CAR (XCDR (rest))))
	    {
	      XSETCDR (rest, XCDR (XCDR (rest)));
	      break;
	    }
      }
  }
}
\f
/* Given a selection-name and desired type, look up our local copy of
   the selection value and convert it to the type.
   Return nil, a string, a vector, a symbol, an integer, or a cons
   that CONS_TO_INTEGER could plausibly handle.
   This function is used both for remote requests (LOCAL_REQUEST is zero)
   and for local x-get-selection-internal (LOCAL_REQUEST is nonzero).

   If LOCAL_VALUE is non-nil, use it as the local copy.  Also allow
   quitting in that case, and let DPYINFO be NULL.

   If NEED_ALTERNATE is true, use the drag-and-drop local value
   instead.

   This calls random Lisp code, and may signal or gc.  */

static Lisp_Object
x_get_local_selection (Lisp_Object selection_symbol, Lisp_Object target_type,
		       bool local_request, struct x_display_info *dpyinfo,
		       Lisp_Object local_value, bool need_alternate)
{
  Lisp_Object tem;
  Lisp_Object handler_fn, value, check;
  bool may_quit;
  specpdl_ref count;

  may_quit = false;

  if (NILP (local_value))
    local_value = LOCAL_SELECTION (selection_symbol, dpyinfo);
  else
    may_quit = true;

  if (NILP (local_value))
    return Qnil;

  /* TIMESTAMP is a special case.  */
  if (EQ (target_type, QTIMESTAMP))
    {
      handler_fn = Qnil;
      value = XCAR (XCDR (XCDR (local_value)));
    }
  else
    {
      /* Don't allow a quit within the converter.
	 When the user types C-g, he would be surprised
	 if by luck it came during a converter.  */
      count = SPECPDL_INDEX ();

      if (!may_quit)
	specbind (Qinhibit_quit, Qt);

      CHECK_SYMBOL (target_type);
      handler_fn = CDR (Fassq (target_type, Vselection_converter_alist));

      if (CONSP (handler_fn))
	handler_fn = XCDR (handler_fn);

      if (!need_alternate)
	tem = XCAR (XCDR (local_value));
      else
	tem = XCAR (XCDR (XCDR (XCDR (XCDR (local_value)))));

      if (STRINGP (tem))
	{
	  local_value = Fget_text_property (make_fixnum (0),
					    target_type, tem);

	  if (!NILP (local_value))
	    tem = local_value;
	}

      if (!NILP (handler_fn))
	value = call3 (handler_fn, selection_symbol,
		       ((local_request
			 && NILP (Vx_treat_local_requests_remotely))
			? Qnil
			: target_type),
		       tem);
      else
	value = Qnil;
      value = unbind_to (count, value);
    }

  /* Make sure this value is of a type that we could transmit
     to another X client.  */

  check = value;
  if (CONSP (value)
      && SYMBOLP (XCAR (value)))
    check = XCDR (value);

  if (STRINGP (check)
      || VECTORP (check)
      || SYMBOLP (check)
      || INTEGERP (check)
      || NILP (value))
    return value;
  /* Check for a value that CONS_TO_INTEGER could handle.  */
  else if (CONSP (check)
	   && INTEGERP (XCAR (check))
	   && (INTEGERP (XCDR (check))
	       ||
	       (CONSP (XCDR (check))
		&& INTEGERP (XCAR (XCDR (check)))
		&& NILP (XCDR (XCDR (check))))))
    return value;

  signal_error ("Invalid data returned by selection-conversion function",
		list2 (handler_fn, value));
}
\f
/* Subroutines of x_reply_selection_request.  */

/* Send a SelectionNotify event to the requestor with property=None,
   meaning we were unable to do what they wanted.  */

static void
x_decline_selection_request (struct selection_input_event *event)
{
  XEvent reply_base;
  XSelectionEvent *reply;
  Display *dpy;
  struct x_display_info *dpyinfo;

  reply = &(reply_base.xselection);
  dpy = SELECTION_EVENT_DISPLAY (event);
  dpyinfo = x_display_info_for_display (dpy);

  if (!dpyinfo)
    return;

  reply->type = SelectionNotify;
  reply->display = dpy;
  reply->requestor = SELECTION_EVENT_REQUESTOR (event);
  reply->selection = SELECTION_EVENT_SELECTION (event);
  reply->time = SELECTION_EVENT_TIME (event);
  reply->target = SELECTION_EVENT_TARGET (event);
  reply->property = None;

  /* The reason for the error may be that the receiver has
     died in the meantime.  Handle that case.  */
  block_input ();
  x_ignore_errors_for_next_request (dpyinfo);
  XSendEvent (dpyinfo->display, reply->requestor,
	      False, 0, &reply_base);
  x_stop_ignoring_errors (dpyinfo);

  XFlush (dpyinfo->display);
  unblock_input ();
}

/* Raw selection data, for sending to a requestor window.  */

struct selection_data
{
  /* Pointer to the selection data.  */
  unsigned char *data;

  /* A Lisp_Object containing the selection data.  This is either
     Qnil, or `data' is NULL.  If non-nil, then this must be a string
     whose contents will be written out verbatim.  */
  Lisp_Object string;

  /* The size, in number of items, of the selection data.
     The value is meaningless if string is non-nil.  */
  ptrdiff_t size;

  /* The format of the selection data.  */
  int format;

  /* The type of the selection data.  */
  Atom type;

  /* The property describing the selection data.  */
  Atom property;

  /* The next piece of selection data in the current selection request
     stack frame.  This can be NULL.  */
  struct selection_data *next;
};

/* Structure representing a single outstanding selection request (or
   subrequest if MULTIPLE is being used.)  */

struct transfer
{
  /* The requestor of this transfer.  */
  Window requestor;

  /* The current offset in items into the selection data, and the
     number of items to send with each ChangeProperty request.  */
  size_t offset, items_per_request;

  /* The display info associated with the transfer.  */
  struct x_display_info *dpyinfo;

  /* The converted selection data.  */
  struct selection_data data;

  /* The next and last selection transfers on this list.  */
  struct transfer *next, *last;

  /* The atimer for the timeout.  */
  struct atimer *timeout;

  /* Flags.  */
  int flags;
};

#define SELECTED_EVENTS 1

struct x_selection_request
{
  /* The last element in this stack.  */
  struct x_selection_request *last;

  /* Its display info.  */
  struct x_display_info *dpyinfo;

  /* Its selection input event.  */
  struct selection_input_event *request;

  /* Linked list of the above (in support of MULTIPLE targets).  */
  struct selection_data *converted_selections;

  /* "Data" to send a requestor for a failed MULTIPLE subtarget.  */
  Atom conversion_fail_tag;

  /* Whether or not conversion was successful.  */
  bool converted;
};

/* Stack of selections currently being processed.
   NULL if all requests have been fully processed.  */

struct x_selection_request *selection_request_stack;

/* List of all outstanding selection transfers which are currently
   being processed.  */

struct transfer outstanding_transfers;

\f

struct prop_location
{
  int identifier;
  Display *display;
  Window window;
  Atom property;
  int desired_state;
  bool arrived;
  struct prop_location *next;
};

static int prop_location_identifier;

static Lisp_Object property_change_reply;

static struct prop_location *property_change_reply_object;

static struct prop_location *property_change_wait_list;

static void
set_property_change_object (struct prop_location *location)
{
  /* Input must be blocked so we don't get the event before we set
     these.  */
  if (! input_blocked_p ())
    emacs_abort ();

  XSETCAR (property_change_reply, Qnil);
  property_change_reply_object = location;
}

\f

static void
x_push_current_selection_request (struct selection_input_event *se,
				  struct x_display_info *dpyinfo)
{
  struct x_selection_request *frame;

  frame = xmalloc (sizeof *frame);
  frame->converted = false;
  frame->last = selection_request_stack;
  frame->request = se;
  frame->dpyinfo = dpyinfo;
  frame->converted_selections = NULL;
  frame->conversion_fail_tag = None;

  selection_request_stack = frame;
}

static void
x_pop_current_selection_request (void)
{
  struct x_selection_request *tem;

  tem = selection_request_stack;
  selection_request_stack = selection_request_stack->last;

  xfree (tem);
}

static bool
x_selection_for_multiple (struct selection_data *data)
{
  return (Atom *) data->data
    == &selection_request_stack->conversion_fail_tag;
}

/* Used as an unwind-protect clause so that, if a selection-converter signals
   an error, we tell the requestor that we were unable to do what they wanted
   before we throw to top-level or go into the debugger or whatever.  */

static void
x_selection_request_lisp_error (void)
{
  struct selection_data *cs, *next;
  struct x_selection_request *frame;

  frame = selection_request_stack;

  for (cs = frame->converted_selections; cs; cs = next)
    {
      next = cs->next;
      if (cs->data && ! x_selection_for_multiple (cs))
	xfree (cs->data);
      xfree (cs);
    }
  frame->converted_selections = NULL;

  if (!frame->converted && frame->dpyinfo->display)
    x_decline_selection_request (frame->request);
}

\f

static size_t
c_size_for_format (int format)
{
  switch (format)
    {
    case 8:
      return sizeof (char);

    case 16:
      return sizeof (short);

    case 32:
      return sizeof (long);
    }

  emacs_abort ();
}

static size_t
x_size_for_format (int format)
{
  switch (format)
    {
    case 8:
      return 1;

    case 16:
      return 2;

    case 32:
      return 4;
    }

  emacs_abort ();
}

/* Return a pointer to the remaining part of the selection data, given
   a pointer to a struct selection_data and an offset in items.  Place
   the number of items remaining in REMAINING.  Garbage collection
   must not happen, or the returned pointer becomes invalid.  */

static unsigned char *
selection_data_for_offset (struct selection_data *data,
			   long offset, size_t *remaining)
{
  unsigned char *base;
  size_t size;

  if (!NILP (data->string))
    {
      base = SDATA (data->string);
      size = SBYTES (data->string);
    }
  else
    {
      base = data->data;
      size = data->size;
    }

  if (offset >= size)
    {
      *remaining = 0;
      return NULL;
    }

  base += (offset * c_size_for_format (data->format));
  *remaining = size - offset;
  return base;
}

/* Return the size, in bytes transferred to the X server, of
   data->size items of selection data in data->format-bit
   quantities.  */

static size_t
selection_data_size (struct selection_data *data)
{
  size_t scratch;

  if (!NILP (data->string))
    return SBYTES (data->string);

  switch (data->format)
    {
    case 8:
      return (size_t) data->size;

    case 16:
      if (INT_MULTIPLY_WRAPV (data->size, 2, &scratch))
	return SIZE_MAX;

      return scratch;

    case 32:
      if (INT_MULTIPLY_WRAPV (data->size, 4, &scratch))
	return SIZE_MAX;

      return scratch;
    }

  /* The specified format is invalid.  */
  emacs_abort ();
}

/* Return whether or not another outstanding selection transfer is
   still selecting for events on the specified requestor window.  */

static bool
transfer_selecting_event (struct x_display_info *dpyinfo,
			  Window requestor)
{
  struct transfer *next;

  next = outstanding_transfers.next;
  for (; next != &outstanding_transfers; next = next->next)
    {
      if (next->requestor == requestor
	  && next->dpyinfo == dpyinfo)
	return true;
    }

  return false;
}

/* Cancel the specified selection transfer.  When called by
   `start_transfer', the transfer may be partially formed.  */

static void
x_cancel_selection_transfer (struct transfer *transfer)
{
  xfree (transfer->data.data);

  if (transfer->next)
    {
      transfer->next->last = transfer->last;
      transfer->last->next = transfer->next;
    }

  if (transfer->flags & SELECTED_EVENTS
      && !transfer_selecting_event (transfer->dpyinfo,
				    transfer->requestor)
      /* This can be called from x_delete_display.  */
      && transfer->dpyinfo->display)
    {
      /* Ignore errors generated by the change window request in case
	 the window has gone away.  */
      block_input ();
      x_ignore_errors_for_next_request (transfer->dpyinfo);
      XSelectInput (transfer->dpyinfo->display,
		    transfer->requestor, NoEventMask);
      x_stop_ignoring_errors (transfer->dpyinfo);
      unblock_input ();
    }

  cancel_atimer (transfer->timeout);
  xfree (transfer);
}

static void
x_selection_transfer_timeout (struct atimer *atimer)
{
  struct transfer *transfer;

  transfer = atimer->client_data;
  x_cancel_selection_transfer (transfer);
}

/* Start a selection transfer to write the specified selection data to
   its requestor.  If the data is small enough, write it to the
   requestor window and return.  Otherwise, start INCR transfer and
   begin listening for PropertyNotify events on the requestor.  */

static void
x_start_selection_transfer (struct x_display_info *dpyinfo, Window requestor,
			    struct selection_data *data)
{
  struct transfer *transfer;
  intmax_t timeout;
  intmax_t secs;
  int nsecs;
  size_t remaining, max_size;
  unsigned char *xdata;
  unsigned long data_size;

  timeout = max (0, x_selection_timeout);
  secs = timeout / 1000;
  nsecs = (timeout % 1000) * 1000000;

  if (x_selection_for_multiple (data))
    return;

  transfer = xzalloc (sizeof *transfer);
  transfer->requestor = requestor;
  transfer->dpyinfo = dpyinfo;

  transfer->timeout = start_atimer (ATIMER_RELATIVE,
				    make_timespec (secs, nsecs),
				    x_selection_transfer_timeout,
				    transfer);

  /* Note that DATA is copied into transfer.  DATA->data is then set
     to NULL, giving the struct transfer ownership over the selection
     data.  */

  transfer->data = *data;
  data->data = NULL;

  /* Finally, transfer now holds a reference to data->string, if it is
     present.  GC cannot be allowed to happen until this function
     returns.  */
  data->string = Qnil;

  /* Now, try to write the selection data.  If it is bigger than
     selection_quantum (dpyinfo->display), start incremental transfer
     and link the transfer onto the list of pending selections.
     Otherwise, write the transfer at once.  */

  max_size = selection_quantum (dpyinfo->display);

  TRACE3 (" x_start_selection_transfer: transferring to 0x%lx.  "
	  "transfer consists of %zu bytes, quantum being %zu",
	  requestor, selection_data_size (&transfer->data),
	  max_size);

  if (selection_data_size (&transfer->data) > max_size)
    {
      /* Begin incremental selection transfer.  First, calculate how
	 many elements it is ok to write for every ChangeProperty
	 request.  */
      transfer->items_per_request
	= (max_size / x_size_for_format (transfer->data.format));
      TRACE1 (" x_start_selection_transfer: starting incremental"
	      " selection transfer, with %zu items per request",
	      transfer->items_per_request);

      /* Next, link the transfer onto the list of pending selection
	 transfers.  */
      transfer->next = outstanding_transfers.next;
      transfer->last = &outstanding_transfers;
      transfer->next->last = transfer;
      transfer->last->next = transfer;

      /* Now, write the INCR property to begin incremental selection
	 transfer.  offset is currently 0.  */

      data_size = selection_data_size (&transfer->data);

      x_ignore_errors_for_next_request (dpyinfo);
      XChangeProperty (dpyinfo->display, requestor,
		       transfer->data.property,
		       dpyinfo->Xatom_INCR, 32, PropModeReplace,
		       (unsigned char *) &data_size, 1);

      /* This assumes that Emacs is not selecting for any other events
	 from the requestor!

         If the holder of some manager selections (i.e. the settings
         manager) asks Emacs for selection data, things will subtly go
         wrong.  */
      XSelectInput (dpyinfo->display, requestor, PropertyChangeMask);
      transfer->flags |= SELECTED_EVENTS;
      x_stop_ignoring_errors (dpyinfo);
    }
  else
    {
      /* Write the property data now.  */
      xdata = selection_data_for_offset (&transfer->data,
					 0, &remaining);
      eassert (remaining <= INT_MAX);

      TRACE1 (" x_start_selection_transfer:  writing"
	      " %zu elements directly to requestor window",
	      remaining);

      x_ignore_errors_for_next_request (dpyinfo);
      XChangeProperty (dpyinfo->display, requestor,
		       transfer->data.property,
		       transfer->data.type,
		       transfer->data.format,
		       PropModeReplace, xdata, remaining);
      x_stop_ignoring_errors (dpyinfo);

      /* Next, get rid of the transfer.  */
      x_cancel_selection_transfer (transfer);
    }
}

/* Write out the next piece of data that is part of the specified
   selection transfer.  If no more data remains to be written, write
   the EOF property and complete the transfer.  */

static void
x_continue_selection_transfer (struct transfer *transfer)
{
  size_t remaining;
  unsigned char *xdata;

  xdata = selection_data_for_offset (&transfer->data,
				     transfer->offset,
				     &remaining);
  remaining = min (remaining, transfer->items_per_request);

  if (!remaining)
    {
      /* The transfer is finished.  Write zero-length property data to
	 signal EOF and remove the transfer.  */
      TRACE0 (" x_continue_selection_transfer: writing 0 items to"
	      " indicate EOF");
      x_ignore_errors_for_next_request (transfer->dpyinfo);
      XChangeProperty (transfer->dpyinfo->display,
		       transfer->requestor,
		       transfer->data.property,
		       transfer->data.type,
		       transfer->data.format,
		       PropModeReplace,
		       NULL, 0);
      x_stop_ignoring_errors (transfer->dpyinfo);
      TRACE0 (" x_continue_selection_transfer: done sending incrementally");

      x_cancel_selection_transfer (transfer);
    }
  else
    {
      TRACE2 (" x_continue_selection_transfer: writing %zu items"
	      "; current offset is %zu", remaining, transfer->offset);
      eassert (remaining <= INT_MAX);

      x_ignore_errors_for_next_request (transfer->dpyinfo);
      XChangeProperty (transfer->dpyinfo->display,
		       transfer->requestor,
		       transfer->data.property,
		       transfer->data.type,
		       transfer->data.format,
		       PropModeReplace, xdata,
		       remaining);
      x_stop_ignoring_errors (transfer->dpyinfo);
      transfer->offset += remaining;
    }
}

void
x_remove_selection_transfers (struct x_display_info *dpyinfo)
{
  struct transfer *next, *last;

  next = outstanding_transfers.next;
  while (next != &outstanding_transfers)
    {
      last = next;
      next = next->next;

      if (last->dpyinfo == dpyinfo)
	x_cancel_selection_transfer (last);
    }
}

/* Send the reply to a selection request event EVENT.  */

static void
x_reply_selection_request (struct selection_input_event *event,
                           struct x_display_info *dpyinfo)
{
  XEvent message;
  struct selection_data *cs;
  struct x_selection_request *frame;

  block_input ();
  frame = selection_request_stack;

  message.xselection.type = SelectionNotify;
  message.xselection.display = dpyinfo->display;
  message.xselection.requestor = SELECTION_EVENT_REQUESTOR (event);
  message.xselection.selection = SELECTION_EVENT_SELECTION (event);
  message.xselection.time = SELECTION_EVENT_TIME (event);
  message.xselection.target = SELECTION_EVENT_TARGET (event);
  message.xselection.property = SELECTION_EVENT_PROPERTY (event);

  if (message.xselection.property == None)
    message.xselection.property = message.xselection.target;

  /* For each of the converted selections, start a write transfer from
     Emacs to the requestor.  */
  for (cs = frame->converted_selections; cs; cs = cs->next)
    x_start_selection_transfer (dpyinfo,
				SELECTION_EVENT_REQUESTOR (event),
				cs);


  /* Send the SelectionNotify event to the requestor, telling it that
     the property data has arrived.  */
  x_ignore_errors_for_next_request (dpyinfo);
  XSendEvent (dpyinfo->display, SELECTION_EVENT_REQUESTOR (event),
	      False, NoEventMask, &message);
  x_stop_ignoring_errors (dpyinfo);
  unblock_input ();
}

/* Handle a SelectionRequest event EVENT.  This is called from
   keyboard.c when such an event is found in the queue.  */

static void
x_handle_selection_request (struct selection_input_event *event)
{
  Time local_selection_time;
  struct x_display_info *dpyinfo = SELECTION_EVENT_DPYINFO (event);
  Atom selection = SELECTION_EVENT_SELECTION (event);
  Lisp_Object selection_symbol = x_atom_to_symbol (dpyinfo, selection);
  Atom target = SELECTION_EVENT_TARGET (event);
  Lisp_Object target_symbol = x_atom_to_symbol (dpyinfo, target);
  Atom property = SELECTION_EVENT_PROPERTY (event);
  Lisp_Object local_selection_data;
  bool success = false;
  specpdl_ref count = SPECPDL_INDEX ();
  bool pushed, use_alternate;
  Lisp_Object alias, tem;

  alias = Vx_selection_alias_alist;

  FOR_EACH_TAIL_SAFE (alias)
    {
      tem = Qnil;

      if (CONSP (alias))
	tem = XCAR (alias);

      if (CONSP (tem)
	  && EQ (XCAR (tem), selection_symbol)
	  && SYMBOLP (XCDR (tem)))
	{
	  selection_symbol = XCDR (tem);
	  break;
	}
    }

  pushed = false;

  if (!dpyinfo)
    goto REALLY_DONE;

  local_selection_data = LOCAL_SELECTION (selection_symbol, dpyinfo);

  /* Decline if we don't own any selections.  */
  if (NILP (local_selection_data)) goto DONE;

  /* Decline requests issued prior to our acquiring the selection.  */
  CONS_TO_INTEGER (XCAR (XCDR (XCDR (local_selection_data))),
		   Time, local_selection_time);
  if (SELECTION_EVENT_TIME (event) != CurrentTime
      && local_selection_time > SELECTION_EVENT_TIME (event))
    goto DONE;

  use_alternate = false;

  /* This is how the XDND protocol recommends dropping text onto a
     target that doesn't support XDND.  */
  if (dpyinfo->pending_dnd_time
      && ((SELECTION_EVENT_TIME (event)
	   == dpyinfo->pending_dnd_time + 1)
	  || (SELECTION_EVENT_TIME (event)
	      == dpyinfo->pending_dnd_time + 2)))
    use_alternate = true;

  block_input ();
  pushed = true;
  x_push_current_selection_request (event, dpyinfo);
  record_unwind_protect_void (x_pop_current_selection_request);
  record_unwind_protect_void (x_selection_request_lisp_error);
  unblock_input ();

  TRACE2 ("x_handle_selection_request: selection=%s, target=%s",
	  SDATA (SYMBOL_NAME (selection_symbol)),
	  SDATA (SYMBOL_NAME (target_symbol)));

  if (EQ (target_symbol, QMULTIPLE))
    {
      /* For MULTIPLE targets, the event property names a list of atom
	 pairs; the first atom names a target and the second names a
	 non-None property.  */
      Window requestor = SELECTION_EVENT_REQUESTOR (event);
      Lisp_Object multprop;
      ptrdiff_t j, nselections;
      struct selection_data cs;

      if (property == None) goto DONE;
      multprop
	= x_get_window_property_as_lisp_data (dpyinfo, requestor, property,
					      QMULTIPLE, selection, true);

      if (!VECTORP (multprop) || ASIZE (multprop) % 2)
	goto DONE;

      nselections = ASIZE (multprop) / 2;
      /* Perform conversions.  This can signal.  */
      for (j = 0; j < nselections; j++)
	{
	  Lisp_Object subtarget = AREF (multprop, 2*j);
	  Atom subproperty = symbol_to_x_atom (dpyinfo,
					       AREF (multprop, 2*j+1));
	  bool subsuccess = false;

	  if (subproperty != None)
	    subsuccess = x_convert_selection (selection_symbol, subtarget,
					      subproperty, true, dpyinfo,
					      use_alternate);
	  if (!subsuccess)
	    ASET (multprop, 2*j+1, Qnil);
	}

      /* Save conversion results */
      lisp_data_to_selection_data (dpyinfo, multprop, &cs);

      /* If cs.type is ATOM, change it to ATOM_PAIR.  This is
	 because the parameters to a MULTIPLE are ATOM_PAIRs.  */

      if (cs.type == XA_ATOM)
	cs.type = dpyinfo->Xatom_ATOM_PAIR;

      XChangeProperty (dpyinfo->display, requestor, property,
		       cs.type, cs.format, PropModeReplace,
		       cs.data, cs.size);
      success = true;

      xfree (cs.data);
    }
  else
    {
      if (property == None)
	property = SELECTION_EVENT_TARGET (event);

      success = x_convert_selection (selection_symbol,
				     target_symbol, property,
				     false, dpyinfo,
				     use_alternate);
    }

 DONE:

  if (success)
    x_reply_selection_request (event, dpyinfo);
  else
    x_decline_selection_request (event);

  if (pushed)
    selection_request_stack->converted = true;

  /* Run the `x-sent-selection-functions' abnormal hook.  */
  if (!NILP (Vx_sent_selection_functions)
      && !BASE_EQ (Vx_sent_selection_functions, Qunbound))
    CALLN (Frun_hook_with_args, Qx_sent_selection_functions,
	   selection_symbol, target_symbol, success ? Qt : Qnil);

  /* Used to punt when dpyinfo is NULL.  */
 REALLY_DONE:

  unbind_to (count, Qnil);
  return;
}

/* Perform the requested selection conversion, and write the data to
   the converted_selections linked list, where it can be accessed by
   x_reply_selection_request.  If FOR_MULTIPLE, write out
   the data even if conversion fails, using conversion_fail_tag.

   Return true if successful.  */

static bool
x_convert_selection (Lisp_Object selection_symbol,
		     Lisp_Object target_symbol, Atom property,
		     bool for_multiple, struct x_display_info *dpyinfo,
		     bool use_alternate)
{
  Lisp_Object lisp_selection;
  struct selection_data *cs;
  struct x_selection_request *frame;

  lisp_selection
    = x_get_local_selection (selection_symbol, target_symbol,
			     false, dpyinfo, Qnil, use_alternate);

  frame = selection_request_stack;

  /* A nil return value means we can't perform the conversion.  */
  if (NILP (lisp_selection)
      || (CONSP (lisp_selection) && NILP (XCDR (lisp_selection))))
    {
      if (for_multiple)
	{
	  cs = xmalloc (sizeof *cs);
	  cs->data = ((unsigned char *)
		      &selection_request_stack->conversion_fail_tag);
	  cs->size = 1;
	  cs->string = Qnil;
	  cs->format = 32;
	  cs->type = XA_ATOM;
	  cs->property = property;
	  cs->next = frame->converted_selections;
	  frame->converted_selections = cs;
	}

      return false;
    }

  /* Otherwise, record the converted selection to binary.  */
  cs = xmalloc (sizeof *cs);
  cs->data = NULL;
  cs->string = Qnil;
  cs->property = property;
  cs->next = frame->converted_selections;
  frame->converted_selections = cs;

  lisp_data_to_selection_data (dpyinfo, lisp_selection, cs);
  return true;
}
\f
/* Handle a SelectionClear event EVENT, which indicates that some
   client cleared out our previously asserted selection.
   This is called from keyboard.c when such an event is found in the queue.  */

static void
x_handle_selection_clear (struct selection_input_event *event)
{
  Atom selection = SELECTION_EVENT_SELECTION (event);
  Time changed_owner_time = SELECTION_EVENT_TIME (event);

  Lisp_Object selection_symbol, local_selection_data;
  Time local_selection_time;
  struct x_display_info *dpyinfo = SELECTION_EVENT_DPYINFO (event);
  Lisp_Object Vselection_alist;

  TRACE0 ("x_handle_selection_clear");

  if (!dpyinfo) return;

  selection_symbol = x_atom_to_symbol (dpyinfo, selection);
  local_selection_data = LOCAL_SELECTION (selection_symbol, dpyinfo);

  /* Well, we already believe that we don't own it, so that's just fine.  */
  if (NILP (local_selection_data)) return;

  CONS_TO_INTEGER (XCAR (XCDR (XCDR (local_selection_data))),
		   Time, local_selection_time);

  /* We have reasserted the selection since this SelectionClear was
     generated, so we can disregard it.  */
  if (changed_owner_time != CurrentTime
      && local_selection_time > changed_owner_time)
    return;

  /* Otherwise, really clear.  Don't use Fdelq as that may quit.  */
  Vselection_alist = dpyinfo->terminal->Vselection_alist;
  if (EQ (local_selection_data, CAR (Vselection_alist)))
    Vselection_alist = XCDR (Vselection_alist);
  else
    {
      Lisp_Object rest;
      for (rest = Vselection_alist; CONSP (rest); rest = XCDR (rest))
	if (EQ (local_selection_data, CAR (XCDR (rest))))
	  {
	    XSETCDR (rest, XCDR (XCDR (rest)));
	    break;
	  }
    }
  tset_selection_alist (dpyinfo->terminal, Vselection_alist);

  /* Run the `x-lost-selection-functions' abnormal hook.  */
  CALLN (Frun_hook_with_args, Qx_lost_selection_functions, selection_symbol);

  /* If Emacs lost ownership of XdndSelection during drag-and-drop,
     there is no point in continuing the drag-and-drop session.  */
  if (x_dnd_in_progress
      && EQ (selection_symbol, QXdndSelection))
    error ("Lost ownership of XdndSelection");

  redisplay_preserve_echo_area (20);
}

void
x_handle_selection_event (struct selection_input_event *event)
{
  TRACE0 ("x_handle_selection_event");
  if (event->kind != SELECTION_REQUEST_EVENT)
    x_handle_selection_clear (event);
  else
    x_handle_selection_request (event);
}

static bool
x_should_preserve_selection (Lisp_Object selection)
{
  Lisp_Object tem;

  tem = Vx_auto_preserve_selections;

  if (CONSP (Vx_auto_preserve_selections))
    {
      FOR_EACH_TAIL_SAFE (tem)
	{
	  if (EQ (XCAR (tem), selection))
	    return true;
	}

      return false;
    }

  return !NILP (tem);
}

/* Clear all selections that were made from frame F.
   We do this when about to delete a frame.  */

void
x_clear_frame_selections (struct frame *f)
{
  Lisp_Object frame, rest, lost, selection;
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
  struct terminal *t = dpyinfo->terminal;

  XSETFRAME (frame, f);
  lost = Qnil;

  /* Delete elements from the beginning of Vselection_alist.  */
  while (CONSP (t->Vselection_alist)
	 && EQ (frame, XCAR (XCDR (XCDR (XCDR (XCAR (t->Vselection_alist)))))))
    {
      selection = CAR (CAR (t->Vselection_alist));

      if (!x_should_preserve_selection (selection))
	/* Run the `x-lost-selection-functions' abnormal hook.  */
	CALLN (Frun_hook_with_args, Qx_lost_selection_functions,
	       selection);
      else
	lost = Fcons (CAR (t->Vselection_alist), lost);

      tset_selection_alist (t, XCDR (t->Vselection_alist));
    }

  /* Delete elements after the beginning of Vselection_alist.  */
  for (rest = t->Vselection_alist; CONSP (rest); rest = XCDR (rest))
    if (CONSP (XCDR (rest))
	&& EQ (frame, XCAR (XCDR (XCDR (XCDR (XCAR (XCDR (rest))))))))
      {
	selection = XCAR (XCAR (XCDR (rest)));

	if (!x_should_preserve_selection (selection))
	  CALLN (Frun_hook_with_args, Qx_lost_selection_functions,
		 selection);
	else
	  lost = Fcons (XCAR (XCDR (rest)), lost);

	XSETCDR (rest, XCDR (XCDR (rest)));
	break;
      }

  if (!NILP (lost))
    x_preserve_selections (dpyinfo, lost, frame);
}
\f
/* True if any properties for DISPLAY and WINDOW
   are on the list of what we are waiting for.  */

static bool
waiting_for_other_props_on_window (Display *display, Window window)
{
  for (struct prop_location *p = property_change_wait_list; p; p = p->next)
    if (p->display == display && p->window == window)
      return true;
  return false;
}

/* Add an entry to the list of property changes we are waiting for.
   DISPLAY, WINDOW, PROPERTY, STATE describe what we will wait for.
   The return value is a number that uniquely identifies
   this awaited property change.  */

static struct prop_location *
expect_property_change (Display *display, Window window,
                        Atom property, int state)
{
  struct prop_location *pl = xmalloc (sizeof *pl);
  pl->identifier = ++prop_location_identifier;
  pl->display = display;
  pl->window = window;
  pl->property = property;
  pl->desired_state = state;
  pl->next = property_change_wait_list;
  pl->arrived = false;
  property_change_wait_list = pl;
  return pl;
}

/* Delete an entry from the list of property changes we are waiting for.
   IDENTIFIER is the number that uniquely identifies the entry.  */

static void
unexpect_property_change (struct prop_location *location)
{
  struct prop_location *prop, **pprev = &property_change_wait_list;

  for (prop = property_change_wait_list; prop; prop = *pprev)
    {
      if (prop == location)
	{
	  *pprev = prop->next;
	  xfree (prop);
	  break;
	}
      else
	pprev = &prop->next;
    }
}

/* Remove the property change expectation element for IDENTIFIER.  */

static void
wait_for_property_change_unwind (void *loc)
{
  struct prop_location *location = loc;

  unexpect_property_change (location);
  if (location == property_change_reply_object)
    property_change_reply_object = 0;
}

/* Actually wait for a property change.
   IDENTIFIER should be the value that expect_property_change returned.  */

static void
wait_for_property_change (struct prop_location *location)
{
  specpdl_ref count = SPECPDL_INDEX ();

  /* Make sure to do unexpect_property_change if we quit or err.  */
  record_unwind_protect_ptr (wait_for_property_change_unwind, location);

  /* See comment in x_reply_selection_request about setting
     property_change_reply.  Do not do it here.  */

  /* If the event we are waiting for arrives beyond here, it will set
     property_change_reply, because property_change_reply_object says so.  */
  if (! location->arrived)
    {
      intmax_t timeout = max (0, x_selection_timeout);
      intmax_t secs = timeout / 1000;
      int nsecs = (timeout % 1000) * 1000000;
      TRACE2 ("  Waiting %"PRIdMAX" secs, %d nsecs", secs, nsecs);

      if (!input_blocked_p ())
	wait_reading_process_output (secs, nsecs, 0, false,
				     property_change_reply, NULL, 0);
      else
	x_wait_for_cell_change (property_change_reply,
				make_timespec (secs, nsecs));

      if (NILP (XCAR (property_change_reply)))
	{
	  TRACE0 ("  Timed out");
	  error ("Timed out waiting for property-notify event");
	}
    }

  unbind_to (count, Qnil);
}

/* Called from XTread_socket in response to a PropertyNotify event.  */

void
x_handle_property_notify (const XPropertyEvent *event)
{
  struct prop_location *rest;
  struct transfer *next;
#ifdef TRACE_SELECTION
  char *name;
#endif

  for (rest = property_change_wait_list; rest; rest = rest->next)
    {
      if (!rest->arrived
	  && rest->property == event->atom
	  && rest->window == event->window
	  && rest->display == event->display
	  && rest->desired_state == event->state)
	{
#ifdef TRACE_SELECTION
	  name = XGetAtomName (event->display, event->atom);

	  TRACE2 ("Expected %s of property %s",
		  (event->state == PropertyDelete ? "deletion" : "change"),
		  name ? name : "unknown");

	  if (name)
	    XFree (name);
#endif

	  rest->arrived = true;

	  /* If this is the one wait_for_property_change is waiting for,
	     tell it to wake up.  */
	  if (rest == property_change_reply_object)
	    XSETCAR (property_change_reply, Qt);

	  return;
	}
    }

  /* Look for a property change for an outstanding selection
     transfer.  */
  next = outstanding_transfers.next;
  while (next != &outstanding_transfers)
    {
      if (next->dpyinfo->display == event->display
	  && next->requestor == event->window
	  && next->data.property == event->atom
	  && event->state == PropertyDelete)
	{
	  TRACE1 ("Expected PropertyDelete event arrived from the"
		  " requestor window %lx", next->requestor);

	  x_continue_selection_transfer (next);
	  return;
	}

      next = next->next;
    }
}

static void
x_display_selection_waiting_message (struct atimer *timer)
{
  Lisp_Object val;

  val = build_string ("Waiting for reply from selection owner...");
  message3_nolog (val);
}

static void
x_cancel_atimer (void *atimer)
{
  cancel_atimer (atimer);
}

\f
/* Variables for communication with x_handle_selection_notify.  */
static Atom reading_which_selection;
static Lisp_Object reading_selection_reply;
static Window reading_selection_window;

/* Do protocol to read selection-data from the server.
   Converts this to Lisp data and returns it.
   FRAME is the frame whose X window shall request the selection.  */

static Lisp_Object
x_get_foreign_selection (Lisp_Object selection_symbol, Lisp_Object target_type,
			 Lisp_Object time_stamp, Lisp_Object frame)
{
  struct frame *f = XFRAME (frame);
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
  Display *display = dpyinfo->display;
  Window requestor_window = FRAME_X_WINDOW (f);
  Time requestor_time = dpyinfo->last_user_time;
  Atom target_property = dpyinfo->Xatom_EMACS_TMP;
  Atom selection_atom = symbol_to_x_atom (dpyinfo, selection_symbol);
  Atom type_atom = (CONSP (target_type)
		    ? symbol_to_x_atom (dpyinfo, XCAR (target_type))
		    : symbol_to_x_atom (dpyinfo, target_type));
  struct atimer *delayed_message;
  struct timespec message_interval;
  specpdl_ref count;

  count = SPECPDL_INDEX ();

  if (!FRAME_LIVE_P (f))
    return unbind_to (count, Qnil);

  if (! NILP (time_stamp))
    CONS_TO_INTEGER (time_stamp, Time, requestor_time);

  block_input ();
  TRACE2 ("Get selection %s, type %s",
	  XGetAtomName (display, type_atom),
	  XGetAtomName (display, target_property));

  x_catch_errors (display);
  XConvertSelection (display, selection_atom, type_atom, target_property,
		     requestor_window, requestor_time);
  x_check_errors (display, "Can't convert selection: %s");
  x_uncatch_errors_after_check ();

  /* Prepare to block until the reply has been read.  */
  reading_selection_window = requestor_window;
  reading_which_selection = selection_atom;
  XSETCAR (reading_selection_reply, Qnil);

  /* It should not be necessary to stop handling selection requests
     during this time.  In fact, the SAVE_TARGETS mechanism requires
     us to handle a clipboard manager's requests before it returns
     SelectionNotify. */
#if false
  x_start_queuing_selection_requests ();
  record_unwind_protect_void (x_stop_queuing_selection_requests);
#endif

  unblock_input ();

  message_interval = make_timespec (1, 0);
  delayed_message = start_atimer (ATIMER_RELATIVE, message_interval,
				  x_display_selection_waiting_message,
				  NULL);
  record_unwind_protect_ptr (x_cancel_atimer, delayed_message);

  /* This allows quits.  Also, don't wait forever.  */
  intmax_t timeout = max (0, x_selection_timeout);
  intmax_t secs = timeout / 1000;
  int nsecs = (timeout % 1000) * 1000000;
  TRACE1 ("  Start waiting %"PRIdMAX" secs for SelectionNotify.", secs);

  if (input_blocked_p ())
    TRACE0 ("    Input is blocked.");
  else
    TRACE1 ("    Waiting for %d nsecs in addition.", nsecs);

  /* This function can be called with input blocked inside Xt or GTK
     timeouts run inside popup menus, so use a function that works
     when input is blocked.  Prefer wait_reading_process_output
     otherwise, or the toolkit might not get some events.
     (bug#22214) */
  if (!input_blocked_p ())
    wait_reading_process_output (secs, nsecs, 0, false,
				 reading_selection_reply, NULL, 0);
  else
    x_wait_for_cell_change (reading_selection_reply,
			    make_timespec (secs, nsecs));
  TRACE1 ("  Got event = %s", (!NILP (XCAR (reading_selection_reply))
			       ? (SYMBOLP (XCAR (reading_selection_reply))
				  ? SSDATA (SYMBOL_NAME (XCAR (reading_selection_reply)))
				  : "YES")
			       : "NO"));

  if (NILP (XCAR (reading_selection_reply)))
    error ("Timed out waiting for reply from selection owner");
  if (EQ (XCAR (reading_selection_reply), Qlambda))
    return unbind_to (count, Qnil);

  /* Otherwise, the selection is waiting for us on the requested property.  */
  return unbind_to (count,
		    x_get_window_property_as_lisp_data (dpyinfo,
							requestor_window,
							target_property,
							target_type,
							selection_atom,
							false));
}
\f
/* Subroutines of x_get_window_property_as_lisp_data */

/* Use xfree, not XFree, to free the data obtained with this function.  */

static void
x_get_window_property (Display *display, Window window, Atom property,
		       unsigned char **data_ret, ptrdiff_t *bytes_ret,
		       Atom *actual_type_ret, int *actual_format_ret,
		       unsigned long *actual_size_ret)
{
  ptrdiff_t total_size;
  unsigned long bytes_remaining;
  ptrdiff_t offset = 0;
  unsigned char *data = 0;
  unsigned char *tmp_data = 0;
  int result;
  int buffer_size = selection_quantum (display);

  /* Wide enough to avoid overflow in expressions using it.  */
  ptrdiff_t x_long_size = X_LONG_SIZE;

  /* Maximum value for TOTAL_SIZE.  It cannot exceed PTRDIFF_MAX - 1
     and SIZE_MAX - 1, for an extra byte at the end.  And it cannot
     exceed LONG_MAX * X_LONG_SIZE, for XGetWindowProperty.  */
  ptrdiff_t total_size_max
    = ((min (PTRDIFF_MAX, SIZE_MAX) - 1) / x_long_size < LONG_MAX
       ? min (PTRDIFF_MAX, SIZE_MAX) - 1
       : LONG_MAX * x_long_size);

  block_input ();

  /* First probe the thing to find out how big it is.  */
  result = XGetWindowProperty (display, window, property,
			       0, 0, False, AnyPropertyType,
			       actual_type_ret, actual_format_ret,
			       actual_size_ret,
			       &bytes_remaining, &tmp_data);
  if (result != Success)
    goto done;

  /* This was allocated by Xlib, so use XFree.  */
  XFree (tmp_data);

  if (*actual_type_ret == None || *actual_format_ret == 0)
    goto done;

  if (total_size_max < bytes_remaining)
    goto size_overflow;
  total_size = bytes_remaining;
  data = xmalloc (total_size + 1);

  /* Now read, until we've gotten it all.  */
  while (bytes_remaining)
    {
      ptrdiff_t bytes_gotten;
      int bytes_per_item;
      result
	= XGetWindowProperty (display, window, property,
			      offset / X_LONG_SIZE,
			      buffer_size / X_LONG_SIZE,
			      False,
			      AnyPropertyType,
			      actual_type_ret, actual_format_ret,
			      actual_size_ret, &bytes_remaining, &tmp_data);

      /* If this doesn't return Success at this point, it means that
	 some clod deleted the selection while we were in the midst of
	 reading it.  Deal with that, I guess.... */
      if (result != Success)
	break;

      bytes_per_item = *actual_format_ret >> 3;
      eassert (*actual_size_ret <= buffer_size / bytes_per_item);

      /* The man page for XGetWindowProperty says:
         "If the returned format is 32, the returned data is represented
          as a long array and should be cast to that type to obtain the
          elements."
         This applies even if long is more than 32 bits, the X library
         converts from 32 bit elements received from the X server to long
         and passes the long array to us.  Thus, for that case memcpy can not
         be used.  We convert to a 32 bit type here, because so much code
         assume on that.

         The bytes and offsets passed to XGetWindowProperty refers to the
         property and those are indeed in 32 bit quantities if format is 32.  */

      bytes_gotten = *actual_size_ret;
      bytes_gotten *= bytes_per_item;

      TRACE2 ("Read %"pD"d bytes from property %s",
	      bytes_gotten, XGetAtomName (display, property));

      if (total_size - offset < bytes_gotten)
	{
	  unsigned char *data1;
	  ptrdiff_t remaining_lim = total_size_max - offset - bytes_gotten;
	  if (remaining_lim < 0 || remaining_lim < bytes_remaining)
	    goto size_overflow;
	  total_size = offset + bytes_gotten + bytes_remaining;
	  data1 = xrealloc (data, total_size + 1);
	  data = data1;
	}

      if (LONG_WIDTH > 32 && *actual_format_ret == 32)
        {
          unsigned long i;
	  int  *idata = (int *) (data + offset);
          long *ldata = (long *) tmp_data;

          for (i = 0; i < *actual_size_ret; ++i)
	    idata[i] = ldata[i];
        }
      else
	memcpy (data + offset, tmp_data, bytes_gotten);

      offset += bytes_gotten;

      /* This was allocated by Xlib, so use XFree.  */
      XFree (tmp_data);
    }

  XFlush (display);
  data[offset] = '\0';

 done:
  unblock_input ();
  *data_ret = data;
  *bytes_ret = offset;
  return;

 size_overflow:
  if (data)
    xfree (data);
  unblock_input ();
  memory_full (SIZE_MAX);
}
\f
/* Use xfree, not XFree, to free the data obtained with this function.  */

static void
receive_incremental_selection (struct x_display_info *dpyinfo,
			       Window window, Atom property,
			       Lisp_Object target_type,
			       unsigned int min_size_bytes,
			       unsigned char **data_ret,
			       ptrdiff_t *size_bytes_ret,
			       Atom *type_ret, int *format_ret,
			       unsigned long *size_ret,
			       ptrdiff_t *real_bytes_ret)
{
  ptrdiff_t offset = 0;
  struct prop_location *wait_object;
  Display *display = dpyinfo->display;

  if (min (PTRDIFF_MAX, SIZE_MAX) < min_size_bytes)
    memory_full (SIZE_MAX);
  *data_ret = xmalloc (min_size_bytes);
  *size_bytes_ret = min_size_bytes;

  TRACE1 ("Read %u bytes incrementally", min_size_bytes);

  /* At this point, we have read an INCR property.
     Delete the property to ack it.
     (But first, prepare to receive the next event in this handshake.)

     Now, we must loop, waiting for the sending window to put a value on
     that property, then reading the property, then deleting it to ack.
     We are done when the sender places a property of length 0.
   */
  block_input ();
  XSelectInput (display, window, STANDARD_EVENT_SET | PropertyChangeMask);
  TRACE1 ("  Delete property %s",
	  SDATA (SYMBOL_NAME (x_atom_to_symbol (dpyinfo, property))));
  XDeleteProperty (display, window, property);
  TRACE1 ("  Expect new value of property %s",
	  SDATA (SYMBOL_NAME (x_atom_to_symbol (dpyinfo, property))));
  wait_object = expect_property_change (display, window, property,
					PropertyNewValue);
  XFlush (display);
  /* See comment in x_reply_selection_request about property_change_reply.  */
  set_property_change_object (wait_object);
  unblock_input ();

  while (true)
    {
      unsigned char *tmp_data;
      ptrdiff_t tmp_size_bytes;

      TRACE0 ("  Wait for property change");
      wait_for_property_change (wait_object);

      /* expect it again immediately, because x_get_window_property may
	 .. no it won't, I don't get it.
	 .. Ok, I get it now, the Xt code that implements INCR is broken. */
      TRACE0 ("  Get property value");
      x_get_window_property (display, window, property,
			     &tmp_data, &tmp_size_bytes,
			     type_ret, format_ret, size_ret);

      TRACE1 ("  Read increment of %"pD"d bytes", tmp_size_bytes);

      if (tmp_size_bytes == 0) /* we're done */
	{
	  TRACE1 ("Done reading incrementally; total bytes: %"pD"d",
		  *size_bytes_ret);

	  if (! waiting_for_other_props_on_window (display, window))
	    XSelectInput (display, window, STANDARD_EVENT_SET);
	  /* Use xfree, not XFree, because x_get_window_property
	     calls xmalloc itself.  */
	  xfree (tmp_data);
	  break;
	}

      block_input ();
      TRACE1 ("  ACK by deleting property %s",
	      XGetAtomName (display, property));
      XDeleteProperty (display, window, property);
      wait_object = expect_property_change (display, window, property,
					    PropertyNewValue);
      /* See comment in x_reply_selection_request about
	 property_change_reply.  */
      set_property_change_object (wait_object);
      XFlush (display);
      unblock_input ();

      if (*size_bytes_ret - offset < tmp_size_bytes)
	*data_ret = xpalloc (*data_ret, size_bytes_ret,
			     tmp_size_bytes - (*size_bytes_ret - offset),
			     -1, 1);

      memcpy ((*data_ret) + offset, tmp_data, tmp_size_bytes);
      offset += tmp_size_bytes;

      /* *size_bytes_ret is not really the size of the data inside the
	 buffer; it is the size of the buffer allocated by xpalloc.

	 This matters when the cardinal specified in the INCR property
	 (a _lower bound_ on the size of the selection data) is
	 smaller than the actual selection contents, which can happen
	 when programs are streaming selection data from a file
	 descriptor.  In that case, we used to return junk if xpalloc
	 decided to grow the buffer by more than the provided
	 increment; to avoid that, store the actual size of the
	 selection data in *real_bytes_ret.  */
      *real_bytes_ret += tmp_size_bytes;

      /* Use xfree, not XFree, because x_get_window_property
	 calls xmalloc itself.  */
      xfree (tmp_data);
    }
}

\f
/* Fetch a value from property PROPERTY of X window WINDOW on display
   DISPLAY.  TARGET_TYPE and SELECTION_ATOM are used in error message
   if this fails.  */

static Lisp_Object
x_get_window_property_as_lisp_data (struct x_display_info *dpyinfo,
				    Window window, Atom property,
				    Lisp_Object target_type,
				    Atom selection_atom,
				    bool for_multiple)
{
  Atom actual_type;
  int actual_format;
  unsigned long actual_size;
  unsigned char *data = 0;
  ptrdiff_t bytes = 0, array_bytes;
  Lisp_Object val;
  Display *display = dpyinfo->display;

  /* array_bytes is only used as an argument to xpalloc.  The actual
     size of the data inside the buffer is inside bytes.  */
  array_bytes = 0;

  TRACE0 ("Reading selection data");

  x_get_window_property (display, window, property, &data, &bytes,
			 &actual_type, &actual_format, &actual_size);
  if (! data)
    {
      if (for_multiple)
	return Qnil;
      block_input ();
      bool there_is_a_selection_owner
	= XGetSelectionOwner (display, selection_atom) != 0;
      unblock_input ();
      if (there_is_a_selection_owner)
	{
	  AUTO_STRING (format, "Selection owner couldn't convert: %s");
	  CALLN (Fmessage, format,
		 actual_type
		 ? list2 (target_type,
			  x_atom_to_symbol (dpyinfo, actual_type))
		 : target_type);
	  return Qnil;
	}
      else
	{
	  AUTO_STRING (format, "No selection: %s");
	  CALLN (Fmessage, format, x_atom_to_symbol (dpyinfo, selection_atom));
	  return Qnil;
	}
    }

  if (!for_multiple && actual_type == dpyinfo->Xatom_INCR)
    {
      /* That wasn't really the data, just the beginning.  */

      unsigned int min_size_bytes = * ((unsigned int *) data);
      block_input ();
      /* Use xfree, not XFree, because x_get_window_property
	 calls xmalloc itself.  */
      xfree (data);
      unblock_input ();

      /* Clear bytes again.  Previously, receive_incremental_selection
	 would set this to min_size_bytes, but that is now done to
	 array_bytes instead.  */
      bytes = 0;
      receive_incremental_selection (dpyinfo, window, property, target_type,
				     min_size_bytes, &data, &array_bytes,
				     &actual_type, &actual_format,
				     &actual_size, &bytes);
    }

  if (!for_multiple)
    {
      block_input ();
      TRACE1 ("  Delete property %s", XGetAtomName (display, property));
      XDeleteProperty (display, window, property);
      XFlush (display);
      unblock_input ();
    }

  /* It's been read.  Now convert it to a lisp object in some semi-rational
     manner.  */
  val = selection_data_to_lisp_data (dpyinfo, data, bytes,
				     actual_type, actual_format);

  /* Use xfree, not XFree, because x_get_window_property
     calls xmalloc itself.  */
  xfree (data);
  return val;
}
\f
/* These functions convert from the selection data read from the server into
   something that we can use from Lisp, and vice versa.

	Type:	Format:	Size:		Lisp Type:
	-----	-------	-----		-----------
	*	8	*		String
	ATOM	32	1		Symbol
	ATOM	32	> 1		Vector of Symbols
	*	16	1		Integer
	*	16	> 1		Vector of Integers
	*	32	1		Integer
	*	32	> 1		Vector of the above

   When converting an object to C, it may be of the form (SYMBOL . <data>)
   where SYMBOL is what we should claim that the type is.  Format and
   representation are as above.

   Important: When format is 32, data should contain an array of int,
   not an array of long as the X library returns.  This makes a difference
   when sizeof(long) != sizeof(int).  */



static Lisp_Object
selection_data_to_lisp_data (struct x_display_info *dpyinfo,
			     const unsigned char *data,
			     ptrdiff_t size, Atom type, int format)
{
  if (type == dpyinfo->Xatom_NULL)
    return QNULL;

  /* Convert any 8-bit data to a string, for compactness.  */
  else if (format == 8)
    {
      Lisp_Object str, lispy_type;

      str = make_unibyte_string ((char *) data, size);
      /* Indicate that this string is from foreign selection by a text
	 property `foreign-selection' so that the caller of
	 x-get-selection-internal (usually x-get-selection) can know
	 that the string must be decode.  */
      if (type == dpyinfo->Xatom_COMPOUND_TEXT)
	lispy_type = QCOMPOUND_TEXT;
      else if (type == dpyinfo->Xatom_UTF8_STRING)
	lispy_type = QUTF8_STRING;
      else
	lispy_type = QSTRING;
      Fput_text_property (make_fixnum (0), make_fixnum (size),
			  Qforeign_selection, lispy_type, str);
      return str;
    }
  /* Convert a single atom to a Lisp_Symbol.  Convert a set of atoms to
     a vector of symbols.  */
  else if (type == XA_ATOM
	   /* Treat ATOM_PAIR type similar to list of atoms.  */
	   || type == dpyinfo->Xatom_ATOM_PAIR)
    {
      ptrdiff_t i;
      /* On a 64 bit machine sizeof(Atom) == sizeof(long) == 8.
         But the callers of these function has made sure the data for
         format == 32 is an array of int.  Thus, use int instead
         of Atom.  */
      int *idata = (int *) data;

      if (size == sizeof (int))
	return x_atom_to_symbol (dpyinfo, (Atom) idata[0]);
      else
	{
	  Lisp_Object v = make_nil_vector (size / sizeof (int));

	  for (i = 0; i < size / sizeof (int); i++)
	    ASET (v, i, x_atom_to_symbol (dpyinfo, (Atom) idata[i]));
	  return v;
	}
    }

  /* Convert a single 16-bit number or a small 32-bit number to a Lisp_Int.
     If the number is 32 bits and won't fit in a Lisp_Int, convert it
     to a bignum.

     INTEGER is a signed type, CARDINAL is unsigned.
     Assume any other types are unsigned as well.
   */
  else if (format == 32 && size == sizeof (int))
    {
      if (type == XA_INTEGER)
        return INT_TO_INTEGER (((int *) data) [0]);
      else
        return INT_TO_INTEGER (((unsigned int *) data) [0]);
    }
  else if (format == 16 && size == sizeof (short))
    {
      if (type == XA_INTEGER)
        return make_fixnum (((short *) data) [0]);
      else
        return make_fixnum (((unsigned short *) data) [0]);
    }

  /* Convert any other kind of data to a vector of numbers, represented
     as above (as an integer, or a cons of two 16 bit integers.)
   */
  else if (format == 16)
    {
      ptrdiff_t i;
      Lisp_Object v = make_uninit_vector (size / 2);

      if (type == XA_INTEGER)
        {
          for (i = 0; i < size / 2; i++)
            {
              short j = ((short *) data) [i];
              ASET (v, i, make_fixnum (j));
            }
        }
      else
        {
          for (i = 0; i < size / 2; i++)
            {
              unsigned short j = ((unsigned short *) data) [i];
              ASET (v, i, make_fixnum (j));
            }
        }
      return v;
    }
  else
    {
      ptrdiff_t i;
      Lisp_Object v = make_nil_vector (size / X_LONG_SIZE);

      if (type == XA_INTEGER)
        {
          for (i = 0; i < size / X_LONG_SIZE; i++)
            {
              int j = ((int *) data) [i];
              ASET (v, i, INT_TO_INTEGER (j));
            }
        }
      else
        {
          for (i = 0; i < size / X_LONG_SIZE; i++)
            {
              unsigned int j = ((unsigned int *) data) [i];
              ASET (v, i, INT_TO_INTEGER (j));
            }
        }
      return v;
    }
}

/* Convert OBJ to an X long value, and return it as unsigned long.
   OBJ should be an integer or a cons representing an integer.
   Treat values in the range X_LONG_MAX + 1 .. X_ULONG_MAX as X
   unsigned long values: in theory these values are supposed to be
   signed but in practice unsigned 32-bit data are communicated via X
   selections and we need to support that.  */
static unsigned long
cons_to_x_long (Lisp_Object obj)
{
  if (X_ULONG_MAX <= INTMAX_MAX
      || NILP (Fnatnump (CONSP (obj) ? XCAR (obj) : obj)))
    return cons_to_signed (obj, X_LONG_MIN, min (X_ULONG_MAX, INTMAX_MAX));
  else
    return cons_to_unsigned (obj, X_ULONG_MAX);
}

/* Use xfree, not XFree, to free the data obtained with this function.  */

static void
lisp_data_to_selection_data (struct x_display_info *dpyinfo,
			     Lisp_Object obj, struct selection_data *cs)
{
  Lisp_Object type;
  char **name_buffer;

  USE_SAFE_ALLOCA;

  type = Qnil;

  eassert (cs != NULL);

  if (CONSP (obj) && SYMBOLP (XCAR (obj)))
    {
      type = XCAR (obj);
      obj = XCDR (obj);
      if (CONSP (obj) && NILP (XCDR (obj)))
	obj = XCAR (obj);
    }

  /* This is not the same as declining.  */

  if (EQ (obj, QNULL) || (EQ (type, QNULL)))
    {
      cs->format = 32;
      cs->size = 0;
      cs->data = NULL;
      type = QNULL;
    }
  else if (STRINGP (obj))
    {
      if (SCHARS (obj) < SBYTES (obj))
	/* OBJ is a multibyte string containing a non-ASCII char.  */
	signal_error ("Non-ASCII string must be encoded in advance", obj);

      if (NILP (type))
	type = QSTRING;

      cs->format = 8;
      cs->size = -1;
      cs->data = NULL;
      cs->string = obj;
    }
  else if (SYMBOLP (obj))
    {
      void *data = xmalloc (sizeof (Atom) + 1);
      Atom *x_atom_ptr = data;
      cs->data = data;
      cs->format = 32;
      cs->size = 1;
      cs->data[sizeof (Atom)] = 0;
      *x_atom_ptr = symbol_to_x_atom (dpyinfo, obj);
      if (NILP (type)) type = QATOM;
    }
  else if (RANGED_FIXNUMP (X_SHRT_MIN, obj, X_SHRT_MAX))
    {
      void *data = xmalloc (sizeof (short) + 1);
      short *short_ptr = data;
      cs->data = data;
      cs->format = 16;
      cs->size = 1;
      cs->data[sizeof (short)] = 0;
      *short_ptr = XFIXNUM (obj);
      if (NILP (type)) type = QINTEGER;
    }
  else if (INTEGERP (obj)
	   || (CONSP (obj) && INTEGERP (XCAR (obj))
	       && (FIXNUMP (XCDR (obj))
		   || (CONSP (XCDR (obj))
		       && FIXNUMP (XCAR (XCDR (obj)))))))
    {
      void *data = xmalloc (sizeof (unsigned long) + 1);
      unsigned long *x_long_ptr = data;
      cs->data = data;
      cs->format = 32;
      cs->size = 1;
      cs->data[sizeof (unsigned long)] = 0;
      *x_long_ptr = cons_to_x_long (obj);
      if (NILP (type)) type = QINTEGER;
    }
  else if (VECTORP (obj))
    {
      /* Lisp_Vectors may represent a set of ATOMs;
	 a set of 16 or 32 bit INTEGERs;
	 or a set of ATOM_PAIRs (represented as [[A1 A2] [A3 A4] ...]
       */
      ptrdiff_t i;
      ptrdiff_t size = ASIZE (obj);

      if (!size)
	{
	  /* This vector is empty and of unknown type.  Assume that it
	     is a vector of integers.  */

	  cs->data = NULL;
	  cs->format = 32;
	  cs->size = 0;
	  type = QINTEGER;
	}
      else if (SYMBOLP (AREF (obj, 0)))
	/* This vector is an ATOM set */
	{
	  void *data;
	  Atom *x_atoms;
	  if (NILP (type)) type = QATOM;
	  for (i = 0; i < size; i++)
	    if (!SYMBOLP (AREF (obj, i)))
	      signal_error ("All elements of selection vector must have same type", obj);

	  cs->data = data = xnmalloc (size, sizeof *x_atoms);
	  x_atoms = data;
	  cs->format = 32;
	  cs->size = size;

	  if (size == 1)
	    x_atoms[0] = symbol_to_x_atom (dpyinfo, AREF (obj, i));
	  else
	    {
	      SAFE_NALLOCA (name_buffer, sizeof *x_atoms, size);

	      for (i = 0; i < size; i++)
		name_buffer[i] = SSDATA (SYMBOL_NAME (AREF (obj, i)));

	      x_intern_atoms (dpyinfo, name_buffer, size,
			      x_atoms);
	    }
	}
      else
	/* This vector is an INTEGER set, or something like it */
	{
	  int format = 16;
	  int data_size = sizeof (short);
	  void *data;
	  unsigned long *x_atoms;
	  short *shorts;
	  if (NILP (type)) type = QINTEGER;
	  for (i = 0; i < size; i++)
	    {
	      if (! RANGED_FIXNUMP (X_SHRT_MIN, AREF (obj, i),
				     X_SHRT_MAX))
		{
		  /* Use sizeof (long) even if it is more than 32 bits.
		     See comment in x_get_window_property and
		     x_fill_property_data.  */
		  data_size = sizeof (long);
		  format = 32;
		  break;
		}
	    }
	  cs->data = data = xnmalloc (size, data_size);
	  x_atoms = data;
	  shorts = data;
	  cs->format = format;
	  cs->size = size;
	  for (i = 0; i < size; i++)
	    {
	      if (format == 32)
		x_atoms[i] = cons_to_x_long (AREF (obj, i));
	      else
		shorts[i] = XFIXNUM (AREF (obj, i));
	    }
	}
    }
  else
    signal_error (/* Qselection_error */ "Unrecognized selection data", obj);

  cs->type = symbol_to_x_atom (dpyinfo, type);

  SAFE_FREE ();
}

static Lisp_Object
clean_local_selection_data (Lisp_Object obj)
{
  if (CONSP (obj)
      && INTEGERP (XCAR (obj))
      && CONSP (XCDR (obj))
      && FIXNUMP (XCAR (XCDR (obj)))
      && NILP (XCDR (XCDR (obj))))
    obj = Fcons (XCAR (obj), XCDR (obj));

  if (CONSP (obj)
      && INTEGERP (XCAR (obj))
      && FIXNUMP (XCDR (obj)))
    {
      if (BASE_EQ (XCAR (obj), make_fixnum (0)))
	return XCDR (obj);
      if (BASE_EQ (XCAR (obj), make_fixnum (-1)))
	return make_fixnum (- XFIXNUM (XCDR (obj)));
    }
  if (VECTORP (obj))
    {
      ptrdiff_t i;
      ptrdiff_t size = ASIZE (obj);
      Lisp_Object copy;
      if (size == 1)
	return clean_local_selection_data (AREF (obj, 0));
      copy = make_nil_vector (size);
      for (i = 0; i < size; i++)
	ASET (copy, i, clean_local_selection_data (AREF (obj, i)));
      return copy;
    }
  return obj;
}
\f
/* Called from XTread_socket to handle SelectionNotify events.
   If it's the selection we are waiting for, stop waiting
   by setting the car of reading_selection_reply to non-nil.
   We store t there if the reply is successful, lambda if not.  */

void
x_handle_selection_notify (const XSelectionEvent *event)
{
  if (event->requestor != reading_selection_window)
    return;
  if (event->selection != reading_which_selection)
    return;

  TRACE1 ("Received SelectionNotify: %d", (int) event->property);
  XSETCAR (reading_selection_reply,
	   (event->property != 0 ? Qt : Qlambda));
}

\f
/* From a Lisp_Object, return a suitable frame for selection
   operations.  OBJECT may be a frame, a terminal object, or nil
   (which stands for the selected frame--or, if that is not an X
   frame, the first X display on the list).  If no suitable frame can
   be found, return NULL.  */

static struct frame *
frame_for_x_selection (Lisp_Object object)
{
  Lisp_Object tail, frame;
  struct frame *f;

  if (NILP (object))
    {
      f = XFRAME (selected_frame);
      if (FRAME_X_P (f) && FRAME_LIVE_P (f))
	return f;

      FOR_EACH_FRAME (tail, frame)
	{
	  f = XFRAME (frame);
	  if (FRAME_X_P (f) && FRAME_LIVE_P (f))
	    return f;
	}
    }
  else if (TERMINALP (object))
    {
      struct terminal *t = decode_live_terminal (object);

      if (t->type == output_x_window)
	FOR_EACH_FRAME (tail, frame)
	  {
	    f = XFRAME (frame);
	    if (FRAME_LIVE_P (f) && f->terminal == t)
	      return f;
	  }
    }
  else if (FRAMEP (object))
    {
      f = XFRAME (object);
      if (FRAME_X_P (f) && FRAME_LIVE_P (f))
	return f;
    }

  return NULL;
}


DEFUN ("x-own-selection-internal", Fx_own_selection_internal,
       Sx_own_selection_internal, 2, 3, 0,
       doc: /* Assert an X selection of type SELECTION and value VALUE.
SELECTION is a symbol, typically `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
VALUE is typically a string, or a cons of two markers, but may be
anything that the functions on `selection-converter-alist' know about.

FRAME should be a frame that should own the selection.  If omitted or
nil, it defaults to the selected frame.

On Nextstep, FRAME is unused.  */)
  (Lisp_Object selection, Lisp_Object value, Lisp_Object frame)
{
  if (NILP (frame)) frame = selected_frame;
  if (!FRAME_LIVE_P (XFRAME (frame)) || !FRAME_X_P (XFRAME (frame)))
    error ("X selection unavailable for this frame");

  CHECK_SYMBOL (selection);
  if (NILP (value)) error ("VALUE may not be nil");
  x_own_selection (selection, value, frame, Qnil, 0);
  return value;
}


/* Request the selection value from the owner.  If we are the owner,
   simply return our selection value.  If we are not the owner, this
   will block until all of the data has arrived.  */

DEFUN ("x-get-selection-internal", Fx_get_selection_internal,
       Sx_get_selection_internal, 2, 4, 0,
       doc: /* Return text selected from some X window.
SELECTION-SYMBOL is typically `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
TARGET-TYPE is the type of data desired, typically `STRING'.

TIME-STAMP is the time to use in the XConvertSelection call for foreign
selections.  If omitted, defaults to the time for the last event.

TERMINAL should be a terminal object or a frame specifying the X
server to query.  If omitted or nil, that stands for the selected
frame's display, or the first available X display.

On Nextstep, TIME-STAMP and TERMINAL are unused.  */)
  (Lisp_Object selection_symbol, Lisp_Object target_type,
   Lisp_Object time_stamp, Lisp_Object terminal)
{
  Lisp_Object val = Qnil;
  Lisp_Object maybe_alias;
  struct frame *f = frame_for_x_selection (terminal);

  CHECK_SYMBOL (selection_symbol);
  CHECK_SYMBOL (target_type);

  if (EQ (target_type, QMULTIPLE))
    error ("Retrieving MULTIPLE selections is currently unimplemented");
  if (!f)
    error ("X selection unavailable for this frame");

  /* Quitting inside this function is okay, so we don't have to use
     FOR_EACH_TAIL_SAFE.  */
  maybe_alias = Fassq (selection_symbol, Vx_selection_alias_alist);

  if (!NILP (maybe_alias))
    {
      selection_symbol = XCDR (maybe_alias);
      CHECK_SYMBOL (selection_symbol);
    }

  val = x_get_local_selection (selection_symbol, target_type, true,
			       FRAME_DISPLAY_INFO (f), Qnil, false);

  if (NILP (val) && FRAME_LIVE_P (f))
    {
      Lisp_Object frame;
      XSETFRAME (frame, f);
      return x_get_foreign_selection (selection_symbol, target_type,
				      time_stamp, frame);
    }

  if (CONSP (val) && SYMBOLP (XCAR (val)))
    {
      val = XCDR (val);
      if (CONSP (val) && NILP (XCDR (val)))
	val = XCAR (val);
    }
  return clean_local_selection_data (val);
}

DEFUN ("x-disown-selection-internal", Fx_disown_selection_internal,
       Sx_disown_selection_internal, 1, 3, 0,
       doc: /* If we own the selection SELECTION, disown it.
Disowning it means there is no such selection.

Sets the last-change time for the selection to TIME-OBJECT (by default
the time of the last event).

TERMINAL should be a terminal object or a frame specifying the X
server to query.  If omitted or nil, that stands for the selected
frame's display, or the first available X display.

On Nextstep, the TIME-OBJECT and TERMINAL arguments are unused.
On MS-DOS, all this does is return non-nil if we own the selection.  */)
  (Lisp_Object selection, Lisp_Object time_object, Lisp_Object terminal)
{
  Time timestamp;
  Atom selection_atom;
  struct selection_input_event event;
  struct frame *f = frame_for_x_selection (terminal);
  struct x_display_info *dpyinfo;

  if (!f)
    return Qnil;

  dpyinfo = FRAME_DISPLAY_INFO (f);
  CHECK_SYMBOL (selection);

  /* Don't disown the selection when we're not the owner.  */
  if (NILP (LOCAL_SELECTION (selection, dpyinfo)))
    return Qnil;

  selection_atom = symbol_to_x_atom (dpyinfo, selection);

  block_input ();
  if (NILP (time_object))
    timestamp = dpyinfo->last_user_time;
  else
    CONS_TO_INTEGER (time_object, Time, timestamp);
  XSetSelectionOwner (dpyinfo->display, selection_atom, None, timestamp);
  unblock_input ();

  /* It doesn't seem to be guaranteed that a SelectionClear event will be
     generated for a window which owns the selection when that window sets
     the selection owner to None.  The NCD server does, the MIT Sun4 server
     doesn't.  So we synthesize one; this means we might get two, but
     that's ok, because the second one won't have any effect.  */
  SELECTION_EVENT_DPYINFO (&event) = dpyinfo;
  SELECTION_EVENT_SELECTION (&event) = selection_atom;
  SELECTION_EVENT_TIME (&event) = timestamp;
  x_handle_selection_clear (&event);

  return Qt;
}

DEFUN ("x-selection-owner-p", Fx_selection_owner_p, Sx_selection_owner_p,
       0, 2, 0,
       doc: /* Whether the current Emacs process owns the given X Selection.
The arg should be the name of the selection in question, typically one of
the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
For convenience, the symbol nil is the same as `PRIMARY',
and t is the same as `SECONDARY'.

TERMINAL should be a terminal object or a frame specifying the X
server to query.  If omitted or nil, that stands for the selected
frame's display, or the first available X display.

On Nextstep, TERMINAL is unused.  */)
  (Lisp_Object selection, Lisp_Object terminal)
{
  struct frame *f = frame_for_x_selection (terminal);

  CHECK_SYMBOL (selection);
  if (NILP (selection)) selection = QPRIMARY;
  if (EQ (selection, Qt)) selection = QSECONDARY;

  if (f && !NILP (LOCAL_SELECTION (selection, FRAME_DISPLAY_INFO (f))))
    return Qt;
  else
    return Qnil;
}

DEFUN ("x-selection-exists-p", Fx_selection_exists_p, Sx_selection_exists_p,
       0, 2, 0,
       doc: /* Whether there is an owner for the given X selection.
SELECTION should be the name of the selection in question, typically
one of the symbols `PRIMARY', `SECONDARY', `CLIPBOARD', or
`CLIPBOARD_MANAGER' (X expects these literal upper-case names.)  The
symbol nil is the same as `PRIMARY', and t is the same as `SECONDARY'.

TERMINAL should be a terminal object or a frame specifying the X
server to query.  If omitted or nil, that stands for the selected
frame's display, or the first available X display.

On Nextstep, TERMINAL is unused.  */)
  (Lisp_Object selection, Lisp_Object terminal)
{
  Window owner;
  Atom atom;
#ifdef HAVE_XFIXES
  Window temp_owner;
#endif
  struct frame *f = frame_for_x_selection (terminal);
  struct x_display_info *dpyinfo;

  CHECK_SYMBOL (selection);

  if (NILP (selection))
    selection = QPRIMARY;

  if (EQ (selection, Qt))
    selection = QSECONDARY;

  if (!f)
    return Qnil;

  dpyinfo = FRAME_DISPLAY_INFO (f);

  if (!NILP (LOCAL_SELECTION (selection, dpyinfo)))
    return Qt;

  atom = symbol_to_x_atom (dpyinfo, selection);

  if (!atom)
    return Qnil;

#ifdef HAVE_XFIXES
  /* See if this information can be obtained without a roundtrip.  */
  temp_owner = x_find_selection_owner (dpyinfo, atom);

  if (temp_owner != X_INVALID_WINDOW)
    return (temp_owner != None ? Qt : Qnil);
#endif

  block_input ();
  owner = XGetSelectionOwner (dpyinfo->display, atom);
  unblock_input ();

  return (owner ? Qt : Qnil);
}

DEFUN ("x-get-local-selection", Fx_get_local_selection, Sx_get_local_selection,
       0, 2, 0,
       doc: /* Run selection converters for VALUE, and return the result.
TARGET is the selection target that is used to find a suitable
converter.  VALUE is a list of 4 values NAME, SELECTION-VALUE,
TIMESTAMP and FRAME.  NAME is the name of the selection that will be
passed to selection converters, SELECTION-VALUE is the value of the
selection used by the converter, TIMESTAMP is not meaningful (but must
be a number that fits in an X timestamp), and FRAME is the frame
describing the terminal for which the selection converter will be
run.  */)
  (Lisp_Object value, Lisp_Object target)
{
  Time time;
  Lisp_Object name, timestamp, frame, result;

  CHECK_SYMBOL (target);

  /* Check that VALUE has 4 elements, for x_get_local_selection.  */
  Lisp_Object v = value; CHECK_CONS (v);
  name = XCAR (v); v = XCDR (v); CHECK_CONS (v);
  v = XCDR (v); CHECK_CONS (v);
  timestamp = XCAR (v); v = XCDR (v); CHECK_CONS (v);
  frame = XCAR (v);

  CHECK_SYMBOL (name);
  CONS_TO_INTEGER (timestamp, Time, time);
  check_window_system (decode_live_frame (frame));

  result = x_get_local_selection (name, target, true,
				  NULL, value, false);

  if (CONSP (result) && SYMBOLP (XCAR (result)))
    {
      result = XCDR (result);

      if (CONSP (result) && NILP (XCDR (result)))
	result = XCAR (result);
    }

  return clean_local_selection_data (result);
}

\f
/* Send clipboard manager a SAVE_TARGETS request with a UTF8_STRING
   property (https://www.freedesktop.org/wiki/ClipboardManager/).  */

static Lisp_Object
x_clipboard_manager_save (Lisp_Object frame)
{
  struct frame *f = XFRAME (frame);
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
  Atom data = dpyinfo->Xatom_UTF8_STRING;

  XChangeProperty (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
		   dpyinfo->Xatom_EMACS_TMP,
		   dpyinfo->Xatom_ATOM, 32, PropModeReplace,
		   (unsigned char *) &data, 1);
  x_get_foreign_selection (QCLIPBOARD_MANAGER, QSAVE_TARGETS,
			   Qnil, frame);
  return Qt;
}

/* Error handler for x_clipboard_manager_save_frame.  */

static Lisp_Object
x_clipboard_manager_error_1 (Lisp_Object err)
{
  AUTO_STRING (format, "X clipboard manager error: %s\n\
If the problem persists, set `%s' to nil.");
  AUTO_STRING (varname, "x-select-enable-clipboard-manager");
  CALLN (Fmessage, format, CAR (CDR (err)), varname);
  return Qnil;
}

/* Error handler for x_clipboard_manager_save_all.  */

static Lisp_Object
x_clipboard_manager_error_2 (Lisp_Object err)
{
  fputs (("Error saving to X clipboard manager.\n"
	  "If the problem persists,"
	  " set 'x-select-enable-clipboard-manager' to nil.\n"),
	 stderr);
  return Qnil;
}

/* Called from delete_frame: save any clipboard owned by FRAME to the
   clipboard manager.  Do nothing if FRAME does not own the clipboard,
   or if no clipboard manager is present.  */

void
x_clipboard_manager_save_frame (Lisp_Object frame)
{
  struct frame *f;

  if (!NILP (Vx_select_enable_clipboard_manager)
      && FRAMEP (frame)
      && (f = XFRAME (frame), FRAME_X_P (f))
      && FRAME_LIVE_P (f))
    {
      struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
      Lisp_Object local_selection
	= LOCAL_SELECTION (QCLIPBOARD, dpyinfo);

      if (!NILP (local_selection)
	  && EQ (frame, XCAR (XCDR (XCDR (XCDR (local_selection)))))
	  && XGetSelectionOwner (dpyinfo->display,
				 dpyinfo->Xatom_CLIPBOARD_MANAGER))
	internal_condition_case_1 (x_clipboard_manager_save, frame, Qt,
				   x_clipboard_manager_error_1);
    }
}

/* Called from Fkill_emacs: save any clipboard owned by FRAME to the
   clipboard manager.  Do nothing if FRAME does not own the clipboard,
   or if no clipboard manager is present.  */

void
x_clipboard_manager_save_all (void)
{
  /* Loop through all X displays, saving owned clipboards.  */
  struct x_display_info *dpyinfo;
  Lisp_Object local_selection, local_frame;

  if (NILP (Vx_select_enable_clipboard_manager))
    return;

  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    {
      local_selection = LOCAL_SELECTION (QCLIPBOARD, dpyinfo);
      if (NILP (local_selection)
	  || !XGetSelectionOwner (dpyinfo->display,
				  dpyinfo->Xatom_CLIPBOARD_MANAGER))
	continue;

      local_frame = XCAR (XCDR (XCDR (XCDR (local_selection))));
      if (FRAME_LIVE_P (XFRAME (local_frame)))
	{
	  message ("Saving clipboard to X clipboard manager...");
	  internal_condition_case_1 (x_clipboard_manager_save, local_frame,
				     Qt, x_clipboard_manager_error_2);
	}
    }
}

\f
/***********************************************************************
                      Drag and drop support
***********************************************************************/
/* Check that lisp values are of correct type for x_fill_property_data.
   That is, number, string or a cons with two numbers (low and high 16
   bit parts of a 32 bit number).  Return the number of items in DATA,
   or -1 if there is an error.  */

int
x_check_property_data (Lisp_Object data)
{
  Lisp_Object iter;
  int size = 0;

  for (iter = data; CONSP (iter); iter = XCDR (iter))
    {
      Lisp_Object o = XCAR (iter);

      if (! NUMBERP (o) && ! STRINGP (o) && ! CONSP (o))
        return -1;
      else if (CONSP (o) &&
               (! NUMBERP (XCAR (o)) || ! NUMBERP (XCDR (o))))
        return -1;
      if (size == INT_MAX)
	return -1;
      size++;
    }

  return size;
}

/* Convert lisp values to a C array.  Values may be a number, a string
   which is taken as an X atom name and converted to the atom value, or
   a cons containing the two 16 bit parts of a 32 bit number.

   DPY is the display use to look up X atoms.
   DATA is a Lisp list of values to be converted.
   RET is the C array that contains the converted values.
   NELEMENTS_MAX is the number of values that will fit in RET.
   Any excess values in DATA are ignored.
   FORMAT is 8, 16 or 32 and denotes char/short/long for each C value to
   be stored in RET.  Note that long is used for 32 even if long is more
   than 32 bits (see man pages for XChangeProperty, XGetWindowProperty and
   XClientMessageEvent).  */

void
x_fill_property_data (struct x_display_info *dpyinfo, Lisp_Object data,
		      void *ret, int nelements_max, int format)
{
  unsigned long val;
  unsigned long  *d32 = (unsigned long  *) ret;
  unsigned short *d16 = (unsigned short *) ret;
  unsigned char  *d08 = (unsigned char  *) ret;
  int nelements;
  Lisp_Object iter;

  for (iter = data, nelements = 0;
       CONSP (iter) && nelements < nelements_max;
       iter = XCDR (iter), nelements++)
    {
      Lisp_Object o = XCAR (iter);

      if (NUMBERP (o) || CONSP (o))
        {
          if (CONSP (o)
	      && RANGED_FIXNUMP (X_LONG_MIN >> 16, XCAR (o), X_LONG_MAX >> 16)
	      && RANGED_FIXNUMP (- (1 << 15), XCDR (o), -1))
            {
	      /* cons_to_x_long does not handle negative values for v2.
                 For XDnd, v2 might be y of a window, and can be negative.
                 The XDnd spec. is not explicit about negative values,
                 but let's assume negative v2 is sent modulo 2**16.  */
	      unsigned long v1 = XFIXNUM (XCAR (o)) & 0xffff;
	      unsigned long v2 = XFIXNUM (XCDR (o)) & 0xffff;
	      val = (v1 << 16) | v2;
            }
          else
            val = cons_to_x_long (o);
        }
      else if (STRINGP (o))
        {
          block_input ();
          val = x_intern_cached_atom (dpyinfo, SSDATA (o), false);
          unblock_input ();
        }
      else
        error ("Wrong type, must be string, number or cons");

      if (format == 8)
	{
	  if ((1 << 8) < val && val <= X_ULONG_MAX - (1 << 7))
	    error ("Out of `char' range");
	  *d08++ = val;
	}
      else if (format == 16)
	{
	  if ((1 << 16) < val && val <= X_ULONG_MAX - (1 << 15))
	    error ("Out of `short' range");
	  *d16++ = val;
	}
      else
        *d32++ = val;
    }
}

/* Convert an array of C values to a Lisp list.
   F is the frame to be used to look up X atoms if the TYPE is XA_ATOM.
   DATA is a C array of values to be converted.
   TYPE is the type of the data.  Only XA_ATOM is special, it converts
   each number in DATA to its corresponding X atom as a symbol.
   FORMAT is 8, 16 or 32 and gives the size in bits for each C value to
   be stored in RET.
   SIZE is the number of elements in DATA.

   Important: When format is 32, data should contain an array of int,
   not an array of long as the X library returns.  This makes a difference
   when sizeof(long) != sizeof(int).

   Also see comment for selection_data_to_lisp_data above.  */

Lisp_Object
x_property_data_to_lisp (struct frame *f, const unsigned char *data,
			 Atom type, int format, unsigned long size)
{
  ptrdiff_t format_bytes = format >> 3;
  ptrdiff_t data_bytes;
  if (INT_MULTIPLY_WRAPV (size, format_bytes, &data_bytes))
    memory_full (SIZE_MAX);
  return selection_data_to_lisp_data (FRAME_DISPLAY_INFO (f), data,
				      data_bytes, type, format);
}

DEFUN ("x-get-atom-name", Fx_get_atom_name,
       Sx_get_atom_name, 1, 2, 0,
       doc: /* Return the X atom name for VALUE as a string.
VALUE may be a number or a cons where the car is the upper 16 bits and
the cdr is the lower 16 bits of a 32 bit value.
Use the display for FRAME or the current frame if FRAME is not given or nil.

If the value is 0 or the atom is not known, return the empty string.  */)
  (Lisp_Object value, Lisp_Object frame)
{
  struct frame *f = decode_window_system_frame (frame);
  Display *dpy = FRAME_X_DISPLAY (f);
  struct x_display_info *dpyinfo;
  Atom atom;
  bool had_errors_p, need_sync;
  char *name;
  Lisp_Object ret;

  dpyinfo = FRAME_DISPLAY_INFO (f);
  CONS_TO_INTEGER (value, Atom, atom);

  x_catch_errors (dpy);
  name = x_get_atom_name (dpyinfo, atom, &need_sync);
  had_errors_p = need_sync && x_had_errors_p (dpy);
  x_uncatch_errors_after_check ();

  ret = empty_unibyte_string;

  if (name)
    {
      if (!had_errors_p)
	ret = build_string (name);
      xfree (name);
    }

  return ret;
}

DEFUN ("x-register-dnd-atom", Fx_register_dnd_atom,
       Sx_register_dnd_atom, 1, 2, 0,
       doc: /* Request that dnd events are made for ClientMessages with ATOM.
ATOM can be a symbol or a string.  The ATOM is interned on the display that
FRAME is on.  If FRAME is nil, the selected frame is used.  */)
  (Lisp_Object atom, Lisp_Object frame)
{
  Atom x_atom;
  struct frame *f = decode_window_system_frame (frame);
  ptrdiff_t i;
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);

  if (SYMBOLP (atom))
    x_atom = symbol_to_x_atom (dpyinfo, atom);
  else if (STRINGP (atom))
    {
      block_input ();
      x_atom = x_intern_cached_atom (dpyinfo, SSDATA (atom),
				     false);
      unblock_input ();
    }
  else
    error ("ATOM must be a symbol or a string");

  for (i = 0; i < dpyinfo->x_dnd_atoms_length; ++i)
    if (dpyinfo->x_dnd_atoms[i] == x_atom)
      return Qnil;

  if (dpyinfo->x_dnd_atoms_length == dpyinfo->x_dnd_atoms_size)
    dpyinfo->x_dnd_atoms =
      xpalloc (dpyinfo->x_dnd_atoms, &dpyinfo->x_dnd_atoms_size,
	       1, -1, sizeof *dpyinfo->x_dnd_atoms);

  dpyinfo->x_dnd_atoms[dpyinfo->x_dnd_atoms_length++] = x_atom;
  return Qnil;
}

/* Convert an XClientMessageEvent to a Lisp event of type DRAG_N_DROP_EVENT.  */

bool
x_handle_dnd_message (struct frame *f, const XClientMessageEvent *event,
                      struct x_display_info *dpyinfo, struct input_event *bufp,
		      bool root_window_coords, int root_x, int root_y)
{
  Lisp_Object vec;
  Lisp_Object frame;
  /* format 32 => size 5, format 16 => size 10, format 8 => size 20 */
  unsigned long size = 160/event->format;
  int x, y;
  unsigned char *data = (unsigned char *) event->data.b;
  int idata[5];
  ptrdiff_t i;

  for (i = 0; i < dpyinfo->x_dnd_atoms_length; ++i)
    if (dpyinfo->x_dnd_atoms[i] == event->message_type) break;

  if (i == dpyinfo->x_dnd_atoms_length) return false;

  XSETFRAME (frame, f);

  /* On a 64 bit machine, the event->data.l array members are 64 bits (long),
     but the x_property_data_to_lisp (or rather selection_data_to_lisp_data)
     function expects them to be of size int (i.e. 32).  So to be able to
     use that function, put the data in the form it expects if format is 32. */

  if (LONG_WIDTH > 32 && event->format == 32)
    {
      for (i = 0; i < 5; ++i) /* There are only 5 longs in a ClientMessage. */
	idata[i] = event->data.l[i];
      data = (unsigned char *) idata;
    }

  vec = make_nil_vector (4);
  ASET (vec, 0, SYMBOL_NAME (x_atom_to_symbol (FRAME_DISPLAY_INFO (f),
					       event->message_type)));
  ASET (vec, 1, frame);
  ASET (vec, 2, make_fixnum (event->format));
  ASET (vec, 3, x_property_data_to_lisp (f,
					 data,
					 event->message_type,
					 event->format,
					 size));

  if (!root_window_coords)
    x_relative_mouse_position (f, &x, &y);
  else
    x_translate_coordinates (f, root_x, root_y, &x, &y);

  bufp->kind = DRAG_N_DROP_EVENT;
  bufp->frame_or_window = frame;
  bufp->timestamp = CurrentTime;
  bufp->x = make_fixnum (x);
  bufp->y = make_fixnum (y);
  bufp->arg = vec;
  bufp->modifiers = 0;

  return true;
}

DEFUN ("x-send-client-message", Fx_send_client_message,
       Sx_send_client_message, 6, 6, 0,
       doc: /* Send a client message of MESSAGE-TYPE to window DEST on DISPLAY.

For DISPLAY, specify either a frame or a display name (a string).
If DISPLAY is nil, that stands for the selected frame's display.
DEST may be a number, in which case it is a Window id.  The value 0 may
be used to send to the root window of the DISPLAY.
If DEST is a cons, it is converted to a 32 bit number
with the high 16 bits from the car and the lower 16 bit from the cdr.  That
number is then used as a window id.
If DEST is a frame the event is sent to the outer window of that frame.
A value of nil means the currently selected frame.
If DEST is the string "PointerWindow" the event is sent to the window that
contains the pointer.  If DEST is the string "InputFocus" the event is
sent to the window that has the input focus.
FROM is the frame sending the event.  Use nil for currently selected frame.
MESSAGE-TYPE is the name of an Atom as a string.
FORMAT must be one of 8, 16 or 32 and determines the size of the values in
bits.  VALUES is a list of numbers, cons and/or strings containing the values
to send.  If a value is a string, it is converted to an Atom and the value of
the Atom is sent.  If a value is a cons, it is converted to a 32 bit number
with the high 16 bits from the car and the lower 16 bit from the cdr.
If more values than fits into the event is given, the excessive values
are ignored.

Wait for the event to be sent and signal any error, unless
`x-fast-protocol-requests' is non-nil, in which case errors will be
silently ignored.  */)
  (Lisp_Object display, Lisp_Object dest, Lisp_Object from,
   Lisp_Object message_type, Lisp_Object format, Lisp_Object values)
{
  struct x_display_info *dpyinfo = check_x_display_info (display);

  CHECK_STRING (message_type);
  x_send_client_event (display, dest, from,
                       XInternAtom (dpyinfo->display,
                                    SSDATA (message_type),
                                    False),
                       format, values);

  return Qnil;
}

static void
x_send_client_event (Lisp_Object display, Lisp_Object dest, Lisp_Object from,
                     Atom message_type, Lisp_Object format, Lisp_Object values)
{
  struct x_display_info *dpyinfo = check_x_display_info (display);
  Window wdest;
  XEvent event;
  struct frame *f = decode_window_system_frame (from);
  bool to_root;

  CHECK_FIXNUM (format);
  CHECK_CONS (values);

  if (x_check_property_data (values) == -1)
    error ("Bad data in VALUES, must be number, cons or string");

  if (XFIXNUM (format) != 8 && XFIXNUM (format) != 16 && XFIXNUM (format) != 32)
    error ("FORMAT must be one of 8, 16 or 32");

  event.xclient.type = ClientMessage;
  event.xclient.format = XFIXNUM (format);

  if (FRAMEP (dest) || NILP (dest))
    {
      struct frame *fdest = decode_window_system_frame (dest);
      wdest = FRAME_OUTER_WINDOW (fdest);
    }
  else if (STRINGP (dest))
    {
      if (strcmp (SSDATA (dest), "PointerWindow") == 0)
        wdest = PointerWindow;
      else if (strcmp (SSDATA (dest), "InputFocus") == 0)
        wdest = InputFocus;
      else
        error ("DEST as a string must be one of PointerWindow or InputFocus");
    }
  else if (NUMBERP (dest) || CONSP (dest))
    CONS_TO_INTEGER (dest, Window, wdest);
  else
    error ("DEST must be a frame, nil, string, number or cons");

  if (wdest == 0) wdest = dpyinfo->root_window;
  to_root = wdest == dpyinfo->root_window;

  block_input ();

  event.xclient.send_event = True;
  event.xclient.serial = 0;
  event.xclient.message_type = message_type;
  event.xclient.display = dpyinfo->display;

  /* Some clients (metacity for example) expects sending window to be here
     when sending to the root window.  */
  event.xclient.window = to_root ? FRAME_OUTER_WINDOW (f) : wdest;

  memset (event.xclient.data.l, 0, sizeof (event.xclient.data.l));
  /* event.xclient.data can hold 20 chars, 10 shorts, or 5 longs.  */
  x_fill_property_data (dpyinfo, values, event.xclient.data.b,
                        5 * 32 / event.xclient.format,
                        event.xclient.format);

  /* If event mask is 0 the event is sent to the client that created
     the destination window.  But if we are sending to the root window,
     there is no such client.  Then we set the event mask to 0xffffff.  The
     event then goes to clients selecting for events on the root window.  */
  x_catch_errors_for_lisp (dpyinfo);
  {
    bool propagate = !to_root;
    long mask = to_root ? 0xffffff : 0;

    XSendEvent (dpyinfo->display, wdest, propagate, mask, &event);
    XFlush (dpyinfo->display);
  }
  x_check_errors_for_lisp (dpyinfo, "Failed to send client event: %s");
  x_uncatch_errors_for_lisp (dpyinfo);
  unblock_input ();
}

\f

/* Return the timestamp where ownership of SELECTION was asserted, or
   nil if no local selection is present.  */

Lisp_Object
x_timestamp_for_selection (struct x_display_info *dpyinfo,
			   Lisp_Object selection)
{
  Lisp_Object value, local_value;

  local_value = LOCAL_SELECTION (selection, dpyinfo);

  if (NILP (local_value))
    return Qnil;

  value = XCAR (XCDR (XCDR (local_value)));

  return value;
}

static void syms_of_xselect_for_pdumper (void);

void
syms_of_xselect (void)
{
  defsubr (&Sx_get_selection_internal);
  defsubr (&Sx_own_selection_internal);
  defsubr (&Sx_disown_selection_internal);
  defsubr (&Sx_selection_owner_p);
  defsubr (&Sx_selection_exists_p);

  defsubr (&Sx_get_atom_name);
  defsubr (&Sx_send_client_message);
  defsubr (&Sx_register_dnd_atom);
  defsubr (&Sx_get_local_selection);

  reading_selection_reply = Fcons (Qnil, Qnil);
  staticpro (&reading_selection_reply);
  staticpro (&property_change_reply);

  outstanding_transfers.next = &outstanding_transfers;
  outstanding_transfers.last = &outstanding_transfers;

  DEFVAR_LISP ("selection-converter-alist", Vselection_converter_alist,
	       doc: /* An alist associating X Windows selection-types with functions.
These functions are called to convert the selection, with three args:
the name of the selection (typically `PRIMARY', `SECONDARY', or
`CLIPBOARD'); a desired type to which the selection should be
converted; and the local selection value (whatever was given to
`x-own-selection-internal').

On X Windows, the function can also be a cons of (PREDICATE
. FUNCTION), where PREDICATE determines whether or not the selection
type will appear in the list of selection types available to other
programs, and FUNCTION is the function which is actually called.
PREDICATE is called with the same arguments as FUNCTION, and should
return a non-nil value if the data type is to appear in that list.

The function should return the value to send to the X server
\(typically a string).  A return value of nil
means that the conversion could not be done.
A return value which is the symbol `NULL'
means that a side-effect was executed,
and there is no meaningful selection value.  */);
  Vselection_converter_alist = Qnil;

  DEFVAR_LISP ("x-lost-selection-functions", Vx_lost_selection_functions,
	       doc: /* A list of functions to be called when Emacs loses an X selection.
\(This happens when some other X client makes its own selection
or when a Lisp program explicitly clears the selection.)
The functions are called with one argument, the selection type
\(a symbol, typically `PRIMARY', `SECONDARY', or `CLIPBOARD').  */);
  Vx_lost_selection_functions = Qnil;

  DEFVAR_LISP ("x-sent-selection-functions", Vx_sent_selection_functions,
	       doc: /* A list of functions to be called when Emacs answers a selection request.
The functions are called with three arguments:
  - the selection name (typically `PRIMARY', `SECONDARY', or `CLIPBOARD');
  - the selection-type which Emacs was asked to convert the
    selection into before sending (for example, `STRING' or `LENGTH');
  - a flag indicating success or failure for responding to the request.
We might have failed (and declined the request) for any number of reasons,
including being asked for a selection that we no longer own, or being asked
to convert into a type that we don't know about or that is inappropriate.
This hook doesn't let you change the behavior of Emacs's selection replies,
it merely informs you that they have happened.  */);
  Vx_sent_selection_functions = Qnil;

  DEFVAR_LISP ("x-select-enable-clipboard-manager",
	       Vx_select_enable_clipboard_manager,
	       doc: /* Whether to enable X clipboard manager support.
If non-nil, then whenever Emacs is killed or an Emacs frame is deleted
while owning the X clipboard, the clipboard contents are saved to the
clipboard manager if one is present.  */);
  Vx_select_enable_clipboard_manager = Qt;

  DEFVAR_INT ("x-selection-timeout", x_selection_timeout,
	      doc: /* Number of milliseconds to wait for a selection reply.
If the selection owner doesn't reply in this time, we give up.
A value of 0 means wait as long as necessary.  This is initialized from the
\"*selectionTimeout\" resource.  */);
  x_selection_timeout = 0;

  DEFVAR_LISP ("x-treat-local-requests-remotely", Vx_treat_local_requests_remotely,
    doc: /* Whether to treat local selection requests as remote ones.

If non-nil, selection converters for string types (`STRING',
`UTF8_STRING', `COMPOUND_TEXT', etc) will encode the strings, even
when Emacs itself is converting the selection.  */);
  Vx_treat_local_requests_remotely = Qnil;

  DEFVAR_LISP ("x-selection-alias-alist", Vx_selection_alias_alist,
    doc: /* List of selections to alias to another.
It should be an alist of a selection name to another.  When a
selection request arrives for the first selection, Emacs will respond
as if the request was meant for the other.

Note that this does not affect setting or owning selections.  */);
  Vx_selection_alias_alist = Qnil;

  /* QPRIMARY is defined in keyboard.c.  */
  DEFSYM (QSECONDARY, "SECONDARY");
  DEFSYM (QSTRING, "STRING");
  DEFSYM (QINTEGER, "INTEGER");
  DEFSYM (QCLIPBOARD, "CLIPBOARD");
  DEFSYM (QTIMESTAMP, "TIMESTAMP");
  DEFSYM (QTEXT, "TEXT");

  /* These are types of selection.  */
  DEFSYM (QCOMPOUND_TEXT, "COMPOUND_TEXT");
  DEFSYM (QUTF8_STRING, "UTF8_STRING");

  DEFSYM (QDELETE, "DELETE");
  DEFSYM (QMULTIPLE, "MULTIPLE");
  DEFSYM (QINCR, "INCR");
  DEFSYM (Q_EMACS_TMP_, "_EMACS_TMP_");
  DEFSYM (QTARGETS, "TARGETS");
  DEFSYM (QATOM, "ATOM");
  DEFSYM (QCLIPBOARD_MANAGER, "CLIPBOARD_MANAGER");
  DEFSYM (QSAVE_TARGETS, "SAVE_TARGETS");
  DEFSYM (QNULL, "NULL");
  DEFSYM (QXdndDirectSave0, "XdndDirectSave0");
  DEFSYM (QXdndActionDirectSave, "XdndActionDirectSave");
  DEFSYM (Qtext_plain, "text/plain");
  DEFSYM (Qforeign_selection, "foreign-selection");
  DEFSYM (Qx_lost_selection_functions, "x-lost-selection-functions");
  DEFSYM (Qx_sent_selection_functions, "x-sent-selection-functions");

  DEFSYM (QXmTRANSFER_SUCCESS, "XmTRANSFER_SUCCESS");
  DEFSYM (QXmTRANSFER_FAILURE, "XmTRANSFER_FAILURE");

  pdumper_do_now_and_after_load (syms_of_xselect_for_pdumper);
}

static void
syms_of_xselect_for_pdumper (void)
{
  outstanding_transfers.next = &outstanding_transfers;
  outstanding_transfers.last = &outstanding_transfers;

  reading_selection_window = 0;
  reading_which_selection = 0;
  property_change_wait_list = 0;
  prop_location_identifier = 0;
  property_change_reply = Fcons (Qnil, Qnil);
}

void
mark_xselect (void)
{
  struct transfer *next;
  struct x_selection_request *frame;
  struct selection_data *cs;

  /* Mark all the strings being used as selection data.  A string that
     is still reachable is always reachable via either the selection
     request stack or the list of outstanding transfers.  */

  next = outstanding_transfers.next;

  if (!next)
    /* syms_of_xselect has not yet been called.  */
    return;

  while (next != &outstanding_transfers)
    {
      mark_object (next->data.string);
      next = next->next;
    }

  frame = selection_request_stack;
  for (; frame; frame = frame->last)
    {
      for (cs = frame->converted_selections; cs; cs = cs->next)
	mark_object (cs->string);
    }
}

debug log:

solving 78820cb3a7c ...
found 78820cb3a7c in https://yhetil.org/emacs-bugs/877cz3yf5q.fsf@dick/
found 121b17df1b0 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 121b17df1b053da13fbb3a2657883b337f10a8c4	src/xselect.c

applying [1/1] https://yhetil.org/emacs-bugs/877cz3yf5q.fsf@dick/
diff --git a/src/xselect.c b/src/xselect.c
index 121b17df1b0..78820cb3a7c 100644

Checking patch src/xselect.c...
Applied patch src/xselect.c cleanly.

index at:
100644 78820cb3a7c58cf5a09f0d422b7b1b7fdb70d29f	src/xselect.c

(*) 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).