sbase/date.c

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C
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/* See LICENSE file for copyright and license details. */
#include <limits.h>
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
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#include <unistd.h>
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#include "util.h"
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static void
usage(void)
{
eprintf("usage: %s [-u] [-d format] [+FORMAT]\n", argv0);
}
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int
main(int argc, char *argv[])
{
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char buf[BUFSIZ];
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char *fmt = "%c";
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struct tm *now = NULL;
struct tm *(*tztime)(const time_t *) = localtime;
const char *tz = "local";
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time_t t;
t = time(NULL);
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ARGBEGIN {
case 'd':
t = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, (time_t)-1));
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break;
case 'u':
tztime = gmtime;
tz = "gm";
break;
default:
usage();
} ARGEND;
if (argc > 0 && argv[0][0] == '+')
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fmt = &argv[0][1];
if (!(now = tztime(&t)))
eprintf("%stime failed\n", tz);
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strftime(buf, sizeof(buf), fmt, now);
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puts(buf);
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return 0;
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}