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