sbase/touch.c

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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
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#include <stdlib.h>
#include <sys/stat.h>
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#include <time.h>
#include <unistd.h>
#include <utime.h>
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#include "util.h"
static int aflag;
static int cflag;
static int mflag;
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static time_t t;
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static void
touch(const char *file)
{
int fd;
struct stat st;
struct utimbuf ut;
int r;
if ((r = stat(file, &st)) < 0) {
if (errno != ENOENT)
eprintf("stat %s:", file);
if (cflag)
return;
} else if (r == 0) {
ut.actime = aflag ? t : st.st_atime;
ut.modtime = mflag ? t : st.st_mtime;
if (utime(file, &ut) < 0)
eprintf("utime %s:", file);
return;
}
if ((fd = open(file, O_CREAT | O_EXCL, 0644)) < 0)
eprintf("open %s:", file);
close(fd);
touch(file);
}
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static void
usage(void)
{
eprintf("usage: %s [-acm] [-t stamp] file ...\n", argv0);
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}
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int
main(int argc, char *argv[])
{
t = time(NULL);
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ARGBEGIN {
case 'a':
aflag = 1;
break;
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case 'c':
cflag = 1;
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break;
case 'm':
mflag = 1;
break;
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case 't':
t = estrtonum(EARGF(usage()), 0, LLONG_MAX);
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break;
default:
usage();
} ARGEND;
if (argc < 1)
usage();
for (; argc > 0; argc--, argv++)
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touch(argv[0]);
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return 0;
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}