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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>
*/
#define _XOPEN_SOURCE 600
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <utime.h>
#include <time.h>
#include "toys.h"
#define MTIME 0x01
#define NO_CREATE 0x02
#define ATIME 0x04
#define REFERENCE 0x08
#define TIME 0x10
#define LENGTH 0x20
int touch_main(void)
{
char *arg;
int i, set_a, set_m, create;
time_t curr_a, curr_m;
off_t length;
set_a = !!(toys.optflags & ATIME);
set_m = !!(toys.optflags & MTIME);
create = !(toys.optflags & NO_CREATE);
if (toys.optflags & LENGTH)
length = toy.touch.length;
else
length = -1;
if (toys.optflags & REFERENCE) {
struct stat sb;
if (toys.optflags & TIME)
error_exit("Cannot specify times from more than one source");
xstat(toy.touch.ref_file, &sb);
curr_m = sb.st_mtime;
curr_a = sb.st_atime;
} else if (toys.optflags & TIME) {
struct tm t;
time_t curr;
char *c;
curr = time(NULL);
if (!localtime_r(&curr, &t))
goto time_error;
c = strptime(toy.touch.time, "%m%d%H%M", &t);
if (!c || *c)
goto time_error;
curr_a = curr_m = mktime(&t);
if (curr_a == -1)
time_error:
error_exit("Error converting time %s to internal format",
toy.touch.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) == -1) {
if (create && errno == ENOENT) {
if (creat(arg, 0644))
goto error;
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 (length != -1)
if (truncate(arg, length))
goto error;
if (utime(arg, &buf))
error:
perror_exit(arg);
}
return 0;
}
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