sbase/touch.c
2014-11-19 20:09:29 +00:00

72 lines
1.1 KiB
C

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