sbase/touch.c

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C
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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#include <sys/stat.h>
#include "util.h"
static void touch(const char *);
static bool cflag = false;
static time_t t;
int
main(int argc, char *argv[])
{
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char *end, c;
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t = time(NULL);
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while((c = getopt(argc, argv, "ct:")) != -1)
switch(c) {
case 'c':
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cflag = true;
break;
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case 't':
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t = strtol(optarg, &end, 0);
if(*end != '\0')
eprintf("%s: not a number\n", optarg);
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break;
default:
exit(EXIT_FAILURE);
}
for(; optind < argc; optind++)
touch(argv[optind]);
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return EXIT_SUCCESS;
}
void
touch(const char *str)
{
int fd;
struct stat st;
struct utimbuf ut;
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if(stat(str, &st) != 0) {
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if(errno != ENOENT)
eprintf("stat %s:", str);
if(cflag)
return;
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if((fd = creat(str, O_EXCL|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
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eprintf("creat %s:", str);
close(fd);
}
ut.actime = st.st_atime;
ut.modtime = t;
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if(utime(str, &ut) != 0)
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eprintf("utime %s:", str);
}