sbase/touch.c

90 lines
1.4 KiB
C

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