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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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