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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
USE_TOUCH(NEWTOY(touch, "acd:mr: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 *time;
char *file;
char *date;
)
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 (toys.optflags & (FLAG_t|FLAG_d)) {
char *s, *date, **format;
struct tm tm;
int len = 0;
// Initialize default values for time fields
ts->tv_sec = time(0);
ts->tv_nsec = 0;
// List of search types
if (toys.optflags & FLAG_d) {
format = (char *[]){"%Y-%m-%dT%T", "%Y-%m-%d %T", 0};
date = TT.date;
} else {
format = (char *[]){"%m%d%H%M", "%y%m%d%H%M", "%C%y%m%d%H%M", 0};
date = TT.time;
}
// Trailing Z means UTC timezone, don't expect libc to know this.
i = strlen(s = date);
if (i && toupper(date[i-1])=='Z') {
date[i-1] = 0;
setenv("TZ", "UTC0", 1);
}
while (*format) {
if (toys.optflags&FLAG_t) {
s = strchr(date, '.');
if ((s ? s-date : strlen(date)) != strlen(*format)) {
format++;
continue;
}
}
localtime_r(&(ts->tv_sec), &tm);
// Adjusting for daylight savings time gives the wrong answer.
tm.tm_isdst = 0;
tm.tm_sec = 0;
s = strptime(date, *format++, &tm);
// parse nanoseconds
if (s && *s=='.' && isdigit(s[1])) {
s++;
if (toys.optflags&FLAG_t)
if (1 == sscanf(s, "%2u%n", &(tm.tm_sec), &len)) s += len;
if (1 == sscanf(s, "%lu%n", &ts->tv_nsec, &len)) {
s += len;
if (ts->tv_nsec > 999999999) s = 0;
else while (len++ < 9) ts->tv_nsec *= 10;
}
}
if (s && !*s) break;
}
errno = 0;
ts->tv_sec = mktime(&tm);
if (!s || *s || ts->tv_sec == -1) perror_exit("bad '%s'", date);
}
ts[1]=ts[0];
// Set time from -r?
if (TT.file) {
struct stat st;
xstat(TT.file, &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;) {
// cheat: FLAG_h is rightmost flag, so its value is 1
if (!utimensat(AT_FDCWD, *ss, ts,
(toys.optflags & FLAG_h)*AT_SYMLINK_NOFOLLOW)) ss++;
else if (toys.optflags & FLAG_c) ss++;
else if (access(*ss, F_OK) && (-1!=(fd = open(*ss, O_CREAT, 0666))))
close(fd);
else perror_msg("'%s'", *ss++);
}
}
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