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/* touch.c : change timestamp of a file
*
* Copyright 2012 Choubey Ji <warior.linux@gmail.com>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html
*
* -f is ignored for BSD/macOS compatibility. busybox/coreutils also support
* this, but only coreutils documents it in --help output.
USE_TOUCH(NEWTOY(touch, "<1acd:fmr:t:h[!dtr]", TOYFLAG_BIN))
config TOUCH
bool "touch"
default y
help
usage: touch [-amch] [-d DATE] [-t TIME] [-r FILE] FILE...
Update the access and modification times of each FILE to the current time.
-a Change access time
-m Change modification time
-c Don't create file
-h Change symlink
-d Set time to DATE (in YYYY-MM-DDThh:mm:SS[.frac][tz] format)
-t Set time to TIME (in [[CC]YY]MMDDhhmm[.ss][frac] format)
-r Set time same as reference FILE
*/
#define FOR_touch
#include "toys.h"
GLOBALS(
char *t, *r, *d;
)
void touch_main(void)
{
struct timespec ts[2];
char **ss;
int fd, i;
// use current time if no -t or -d
ts[0].tv_nsec = UTIME_NOW;
if (FLAG(t) || FLAG(d)) {
time_t t = time(0);
unsigned nano;
xparsedate(TT.t ? TT.t : TT.d, &t, &nano, 0);
ts->tv_sec = t;
ts->tv_nsec = nano;
}
ts[1]=ts[0];
if (TT.r) {
struct stat st;
xstat(TT.r, &st);
ts[0] = st.st_atim;
ts[1] = st.st_mtim;
}
// Which time(s) should we actually change?
i = toys.optflags & (FLAG_a|FLAG_m);
if (i && i!=(FLAG_a|FLAG_m)) ts[i!=FLAG_m].tv_nsec = UTIME_OMIT;
// Loop through files on command line
for (ss = toys.optargs; *ss;) {
char *s = *ss++;
if (!strcmp(s, "-")) {
if (!futimens(1, ts)) continue;
} else {
// cheat: FLAG_h is rightmost flag, so its value is 1
if (!utimensat(AT_FDCWD, s, ts, FLAG(h)*AT_SYMLINK_NOFOLLOW)) continue;
if (FLAG(c)) continue;
if (access(s, F_OK) && (-1!=(fd = open(s, O_CREAT, 0666)))) {
close(fd);
if (toys.optflags) ss--;
continue;
}
}
perror_msg("'%s'", s);
}
}
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