sbase/touch.c

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