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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;
struct tm tm;
int len = 0;
localtime_r(&(ts->tv_sec), &tm);
// Set time from -d?
if (toys.optflags & FLAG_d) {
date = TT.date;
i = strlen(date);
if (i) {
// Trailing Z means UTC timezone, don't expect libc to know this.
if (toupper(date[i-1])=='Z') {
date[i-1] = 0;
setenv("TZ", "UTC0", 1);
localtime_r(&(ts->tv_sec), &tm);
}
s = strptime(date, "%Y-%m-%dT%T", &tm);
if (s && *s=='.' && isdigit(s[1]))
sscanf(s, ".%lu%n", &ts->tv_nsec, &len);
else len = 0;
} else s = 0;
// Set time from -t?
} else {
strcpy(toybuf, "%Y%m%d%H%M");
date = TT.time;
i = ((s = strchr(date, '.'))) ? s-date : strlen(date);
if (i < 8 || i%2) error_exit("bad '%s'", date);
for (i=0;i<3;i++) {
s = strptime(date, toybuf+(i&2), &tm);
if (s) break;
toybuf[1]='y';
}
if (s && *s=='.' && sscanf(s, ".%2u%n", &(tm.tm_sec), &len) == 1) {
sscanf(s += len, "%lu%n", &ts->tv_nsec, &len);
len++;
} else len = 0;
}
if (len) {
s += len;
if (ts->tv_nsec > 999999999) s = 0;
else while (len++ < 10) ts->tv_nsec *= 10;
}
errno = 0;
ts->tv_sec = mktime(&tm);
if (!s || *s || errno == EOVERFLOW) 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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