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#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
static void usage(void)
{
fprintf(stderr, "touch: usage: touch [-alm] [-t YYYYMMDD[.hhmmss]] <file>\n");
exit(1);
}
static time_t parse_time(char *s)
{
struct tm tm;
int day = atoi(s);
int hour = 0;
while (*s && *s != '.') {
s++;
}
if (*s) {
s++;
hour = atoi(s);
}
tm.tm_year = day / 10000 - 1900;
tm.tm_mon = (day % 10000) / 100 - 1;
tm.tm_mday = day % 100;
tm.tm_hour = hour / 10000;
tm.tm_min = (hour % 10000) / 100;
tm.tm_sec = hour % 100;
tm.tm_isdst = -1;
return mktime(&tm);
}
int main(int argc, char *argv[])
{
int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
struct timespec specified_time, times[2];
char *file = 0;
specified_time.tv_nsec = UTIME_NOW;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
/* an option */
const char *arg = argv[i]+1;
while (arg[0]) {
switch (arg[0]) {
case 'a': aflag = 1; break;
case 'm': mflag = 1; break;
case 't':
if ((i+1) >= argc)
usage();
specified_time.tv_sec = parse_time(argv[++i]);
if (specified_time.tv_sec == -1) {
fprintf(stderr, "touch: invalid timestamp specified\n");
exit(1);
}
specified_time.tv_nsec = 0;
break;
case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
case 'd': debug = 1; break;
default:
usage();
}
arg++;
}
} else {
/* not an option, and only accept one filename */
if (i+1 != argc)
usage();
file = argv[i];
}
}
if (! file) {
fprintf(stderr, "touch: no file specified\n");
exit(1);
}
if (access(file, F_OK))
if ((fd=creat(file, 0666)) != -1)
close(fd);
if ((mflag == 0) && (aflag == 0))
aflag = mflag = 1;
if (aflag)
times[0] = specified_time;
else
times[0].tv_nsec = UTIME_OMIT;
if (mflag)
times[1] = specified_time;
else
times[1].tv_nsec = UTIME_OMIT;
if (debug) {
fprintf(stderr, "file = %s\n", file);
fprintf(stderr, "times[0].tv_sec = %lld, times[0].tv_nsec = %ld\n", (long long)times[0].tv_sec, (long)times[0].tv_nsec);
fprintf(stderr, "times[1].tv_sec = %lld, times[1].tv_nsec = %ld\n", (long long)times[1].tv_sec, (long)times[1].tv_nsec);
fprintf(stderr, "flags = 0x%8.8x\n", flags);
}
return utimensat(AT_FDCWD, file, times, flags);
}
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