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| | /*
* parse time string - user friendly date and time parser
* Copyright © 2012 Jani Nikula
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Jani Nikula <jani@nikula.org>
*/
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "parse-time-string.h"
/*
* concat argv[start]...argv[end - 1], separating them by a single
* space, to a malloced string
*/
static char *
concat_args (int start, int end, char *argv[])
{
int i;
size_t len = 1;
char *p;
for (i = start; i < end; i++)
len += strlen (argv[i]) + 1;
p = malloc (len);
if (!p)
return NULL;
*p = 0;
for (i = start; i < end; i++) {
if (i != start)
strcat (p, " ");
strcat (p, argv[i]);
}
return p;
}
#define DEFAULT_FORMAT "%a %b %d %T %z %Y"
static void
usage (const char *name)
{
printf ("Usage: %s [options ...] <date/time>\n\n", name);
printf (
"Parse <date/time> and display it in given format.\n\n"
" -f, --format=FMT output format, FMT according to strftime(3)\n"
" (default: \"%s\")\n"
" -n, --now=N use N seconds since epoch as now (default: now)\n"
" -u, --up round result up (default: no rounding)\n"
" -d, --down round result down (default: no rounding)\n"
" -h, --help print this help\n",
DEFAULT_FORMAT);
}
int
main (int argc, char *argv[])
{
int r;
struct tm tm;
time_t result;
time_t now;
time_t *nowp = NULL;
char *argstr;
int round = PARSE_TIME_NO_ROUND;
char buf[1024];
const char *format = DEFAULT_FORMAT;
struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "up", no_argument, NULL, 'u' },
{ "down", no_argument, NULL, 'd' },
{ "format", required_argument, NULL, 'f' },
{ "now", required_argument, NULL, 'n' },
{ NULL, 0, NULL, 0 },
};
for (;;) {
int c;
c = getopt_long (argc, argv, "hudf:n:", options, NULL);
if (c == -1)
break;
switch (c) {
case 'f':
/* output format */
format = optarg;
break;
case 'u':
round = PARSE_TIME_ROUND_UP;
break;
case 'd':
round = PARSE_TIME_ROUND_DOWN;
break;
case 'n':
/* specify now in seconds since epoch */
now = (time_t) strtol (optarg, NULL, 10);
if (now >= (time_t) 0)
nowp = &now;
break;
case 'h':
case '?':
default:
usage (argv[0]);
return 1;
}
}
argstr = concat_args (optind, argc, argv);
if (!argstr)
return 1;
r = parse_time_string (argstr, &result, nowp, round);
free (argstr);
if (r)
return 1;
if (!localtime_r (&result, &tm))
return 1;
strftime (buf, sizeof (buf), format, &tm);
printf ("%s\n", buf);
return 0;
}
|