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/* vi: set sw=4 ts=4:
*
* 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
* acmrtd
USE_TOUCH(NEWTOY(touch, "acd:mr:t:[!dtr]", TOYFLAG_BIN))
config TOUCH
bool "touch"
default y
help
usage: touch [OPTION]... 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 DATE use YYYY-MM-DDThh:mm:SS[.frac][tz] as time
-t TIME use [[CC]YY]MMDDhhmm[.ss][frac] as time
-r FILE use reference file's time
*/
#define FOR_touch
#include "toys.h"
GLOBALS(
char *time;
char *file;
char *date;
)
int fetch(char *file, struct timeval *tv, unsigned flags)
{
struct stat st;
if (stat(TT.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];
struct tm tm;
char **ss;
int flag;
gettimeofday(tv, NULL);
localtime_r(&(tv->tv_sec), &tm);
if (toys.optflags & (FLAG_t|FLAG_d)) {
char *date, *s;
int i, len;
if (toys.optflags & FLAG_d) {
date = TT.date;
i = strlen(date)-1;
if (*date && toupper(date[i])=='Z') {
putenv("TZ=UTC");
strncpy(toybuf, date, sizeof(toybuf)-1);
date = toybuf;
date[i]=0;
gmtime_r(&(tv->tv_sec), &tm);
}
s = strptime(date, "%Y-%m-%dT%T", &tm);
if (s && *s=='.') {
sscanf(s, ".%d%n", &i, &len);
s += len;
tv->tv_usec = i;
}
} else {
strcpy(toybuf, "%Y%m%d%H%M");
date = TT.time;
for (i=0;i<3;i++) {
s = strptime(date, toybuf+(i&2), &tm);
if (s) break;
toybuf[1]='y';
}
if (s && *s=='.') {
int count = sscanf(s, ".%2d%u%n", &(tm.tm_sec), &i, &len);
if (count==2) tv->tv_usec = i;
s += len;
}
}
errno = 0;
tv->tv_sec = mktime(&tm);
if (!s || *s || errno == EOVERFLOW) {
// Warn Indiana Jones the monkey died.
perror_exit("bad '%s'", date);
}
}
tv[1]=tv[0];
if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m))
perror_exit("-r '%s'", TT.file);
flag = (~toys.optflags) & (FLAG_m|FLAG_a);
if (flag == (FLAG_m|FLAG_a)) flag = 0;
for (ss=toys.optargs; *ss;) {
int fd;
if ((!flag || !fetch(*ss, tv, flag)) && !utimes(*ss, tv)) ss++;
else if (toys.optflags & FLAG_c) ss++;
else if (-1 != (fd = open(*ss, O_CREAT, 0666))) close(fd);
else perror_msg("'%s'", *ss++);
}
}
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