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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:[!dtr]", TOYFLAG_BIN))
config TOUCH
bool "touch"
default y
help
usage: touch [-amc] [-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
-d set time to DATE (in YYYY-MM-DDThh:mm:SS[.frac][tz] format)
-t set time to TIME (in [[CC]YY]MMDDhhmm[.ss] format)
-r set time same as reference FILE
*/
#define FOR_touch
#include "toys.h"
GLOBALS(
char *time;
char *file;
char *date;
)
// Fetch access and/or modification time of a file
int fetch(char *file, struct timeval *tv, unsigned flags)
{
struct stat st;
if (stat(file, &st)) return 1;
if (flags & FLAG_a) {
tv[0].tv_sec = st.st_atime;
tv[0].tv_usec = st.st_atim.tv_nsec/1000;
}
if (flags & FLAG_m) {
tv[1].tv_sec = st.st_mtime;
tv[1].tv_usec = st.st_mtim.tv_nsec/1000;
}
return 0;
}
void touch_main(void)
{
struct timeval tv[2];
char **ss;
int flag, fd, i;
// Set time from clock?
gettimeofday(tv, NULL);
if (toys.optflags & (FLAG_t|FLAG_d)) {
char *s, *date;
struct tm tm;
int len;
localtime_r(&(tv->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(&(tv->tv_sec), &tm);
}
s = strptime(date, "%Y-%m-%dT%T", &tm);
if (s && *s=='.' && isdigit(s[1])) {
sscanf(s, ".%d%n", &i, &len);
s += len;
tv->tv_usec = i;
while (len++ < 7) tv->tv_usec *= 10;
}
} 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)
s += len;
}
errno = 0;
tv->tv_sec = mktime(&tm);
if (!s || *s || errno == EOVERFLOW) perror_exit("bad '%s'", date);
}
tv[1]=tv[0];
// Set time from -r?
if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m))
perror_exit("-r '%s'", TT.file);
// Ok, we've got a time. Flip -am flags so now it's the ones we _keep_.
flag = (~toys.optflags) & (FLAG_m|FLAG_a);
// Loop through files on command line
for (ss=toys.optargs; *ss;) {
if ((flag == (FLAG_m|FLAG_a) || !fetch(*ss, tv, flag)) && !utimes(*ss, tv))
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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