| /* 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); |
| } |
| } |