129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/* 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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* TODO: have another go at merging the -t and -d stanzas
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USE_TOUCH(NEWTOY(touch, "acd:mr: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 *time;
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char *file;
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char *date;
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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 (toys.optflags & (FLAG_t|FLAG_d)) {
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char *s, *date;
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struct tm tm;
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int len = 0;
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localtime_r(&(ts->tv_sec), &tm);
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// Set time from -d?
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if (toys.optflags & FLAG_d) {
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date = TT.date;
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i = strlen(date);
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if (i) {
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// Trailing Z means UTC timezone, don't expect libc to know this.
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if (toupper(date[i-1])=='Z') {
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date[i-1] = 0;
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setenv("TZ", "UTC0", 1);
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localtime_r(&(ts->tv_sec), &tm);
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}
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s = strptime(date, "%Y-%m-%dT%T", &tm);
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ts->tv_nsec = 0;
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if (s && *s=='.' && isdigit(s[1]))
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sscanf(s, ".%lu%n", &ts->tv_nsec, &len);
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else len = 0;
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} else s = 0;
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// Set time from -t?
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} else {
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strcpy(toybuf, "%Y%m%d%H%M");
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date = TT.time;
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i = ((s = strchr(date, '.'))) ? s-date : strlen(date);
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if (i < 8 || i%2) error_exit("bad '%s'", date);
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for (i=0;i<3;i++) {
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s = strptime(date, toybuf+(i&2), &tm);
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if (s) break;
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toybuf[1]='y';
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}
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tm.tm_sec = 0;
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ts->tv_nsec = 0;
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if (s && *s=='.' && sscanf(s, ".%2u%n", &(tm.tm_sec), &len) == 1) {
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if (sscanf(s += len, "%lu%n", &ts->tv_nsec, &len) == 1) {
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s--;
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len++;
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} else len = 0;
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} else len = 0;
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}
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if (len) {
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s += len;
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if (ts->tv_nsec > 999999999) s = 0;
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else while (len++ < 10) ts->tv_nsec *= 10;
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}
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errno = 0;
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ts->tv_sec = mktime(&tm);
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if (!s || *s || ts->tv_sec == -1) perror_exit("bad '%s'", date);
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}
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ts[1]=ts[0];
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// Set time from -r?
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if (TT.file) {
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struct stat st;
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xstat(TT.file, &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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// cheat: FLAG_h is rightmost flag, so its value is 1
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if (!utimensat(AT_FDCWD, *ss, ts,
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(toys.optflags & FLAG_h)*AT_SYMLINK_NOFOLLOW)) ss++;
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else if (toys.optflags & FLAG_c) ss++;
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else if (access(*ss, F_OK) && (-1!=(fd = open(*ss, O_CREAT, 0666))))
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close(fd);
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else perror_msg("'%s'", *ss++);
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}
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}
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