1 /* touch.c : change timestamp of a file
2 *
3 * Copyright 2012 Choubey Ji <warior.linux@gmail.com>
4 *
5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html
6 *
7 * -f is ignored for BSD/macOS compatibility. busybox/coreutils also support
8 * this, but only coreutils documents it in --help output.
9
10 USE_TOUCH(NEWTOY(touch, "<1acd:fmr:t:h[!dtr]", TOYFLAG_BIN))
11
12 config TOUCH
13 bool "touch"
14 default y
15 help
16 usage: touch FILE...
17
18 Update the access and modification times of each FILE to the current time.
19
20 */
21
22 #define FOR_touch
23 #include "toys.h"
24
25 GLOBALS(
26 char *t, *r, *d;
27 )
28
touch_main(void)29 void touch_main(void)
30 {
31 struct timespec ts[2];
32 char **ss;
33 int fd, i;
34
35 // use current time if no -t or -d
36 ts[0].tv_nsec = UTIME_NOW;
37
38 if (FLAG(t) || FLAG(d)) {
39 time_t t = time(0);
40 unsigned nano;
41
42 xparsedate(TT.t ? TT.t : TT.d, &t, &nano, 0);
43 ts->tv_sec = t;
44 ts->tv_nsec = nano;
45 }
46 ts[1]=ts[0];
47
48 if (TT.r) {
49 struct stat st;
50
51 xstat(TT.r, &st);
52 ts[0] = st.st_atim;
53 ts[1] = st.st_mtim;
54 }
55
56 // Which time(s) should we actually change?
57 i = toys.optflags & (FLAG_a|FLAG_m);
58 if (i && i!=(FLAG_a|FLAG_m)) ts[i!=FLAG_m].tv_nsec = UTIME_OMIT;
59
60 // Loop through files on command line
61 for (ss = toys.optargs; *ss;) {
62 char *s = *ss++;
63
64 if (!strcmp(s, "-")) {
65 if (!futimens(1, ts)) continue;
66 } else {
67 // cheat: FLAG_h is rightmost flag, so its value is 1
68 if (!utimensat(AT_FDCWD, s, ts, FLAG(h)*AT_SYMLINK_NOFOLLOW)) continue;
69 if (FLAG(c)) continue;
70 if (access(s, F_OK) && (-1!=(fd = open(s, O_CREAT, 0666)))) {
71 close(fd);
72 if (toys.optflags) ss--;
73 continue;
74 }
75 }
76 perror_msg("'%s'", s);
77 }
78 }
79