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/* vi: set sw=4 ts=4:
*
* touch.c - Modify a file's timestamps.
*
* Copyright (C) 2007 Charlie Shepherd <masterdriverz@gentoo.org>
*
* See http://www.opengroup.org/onlinepubs/009695399/utilities/touch.html
config TOUCH
bool "touch"
default y
help
usage: touch [-acm] [-r FILE] [-t MMDDhhmm] [-l bytes] FILE...
Change file timestamps, ensure file existance and change file length.
-a Only change the access time.
-c Do not create the file if it doesn't exist.
-l Length to truncate (or sparsely extend) file to.
-m Only change the modification time.
-r Reference file to take timestamps from.
-t Time to change {a,m}time to.
*/
#include "toys.h"
#define OPT_MTIME 0x01
#define OPT_NOCREATE 0x02
#define OPT_ATIME 0x04
#define OPT_REFERENCE 0x08
#define OPT_TIME 0x10
#define OPT_LENGTH 0x20
void touch_main(void)
{
char *arg;
int i, set_a, set_m;
time_t curr_a, curr_m;
set_a = !!(toys.optflags & OPT_ATIME);
set_m = !!(toys.optflags & OPT_MTIME);
// Use timestamp on a file
if (toys.optflags & OPT_REFERENCE) {
struct stat sb;
if (toys.optflags & OPT_TIME)
error_exit("Redundant time source");
xstat(toy.touch.ref_file, &sb);
curr_m = sb.st_mtime;
curr_a = sb.st_atime;
// Use time specified on command line.
} else if (toys.optflags & OPT_TIME) {
struct tm t;
time_t curr;
char *c;
curr = time(NULL);
if (localtime_r(&curr, &t)
|| !(c = strptime(toy.touch.time, "%m%d%H%M", &t))
|| *c || -1==(curr_a = curr_m = mktime(&t)))
{
error_exit("Unknown time %s", toy.touch.time);
}
// use current time
} else curr_m = curr_a = time(NULL);
for (i = 0; (arg = toys.optargs[i]); i++) {
struct utimbuf buf;
struct stat sb;
buf.modtime = curr_m;
buf.actime = curr_a;
if (stat(arg, &sb)) {
if (!(toys.optflags & OPT_NOCREATE)) {
int temp = umask(0);
xcreate(arg, O_CREAT, 0644);
if (CFG_TOYBOX_FREE) umask(temp);
if (stat(arg, &sb))
goto error;
}
}
if ((set_a+set_m) == 1) {
/* We've been asked to only change one */
if (set_a) buf.modtime = sb.st_mtime;
else if (set_m) buf.actime = sb.st_atime;
}
if (toys.optflags & OPT_LENGTH)
if (truncate(arg, toy.touch.length))
goto error;
if (utime(arg, &buf))
error:
perror_exit(arg);
}
}
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