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root/usr/bin/touch/touch.c

DEFINITIONS

1. main
2. usage
3. do_touch

   1 /*
   2  * Copyright (c) 2005-2007, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <sys/mount.h>
  31 #include <sys/stat.h>
  32 #include <sys/fcntl.h>
  34 #include <unistd.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <string.h>
  38 #include <stdlib.h>
  39 #include <limits.h>
  40 #include <stdio.h>
  42 #ifdef CMDBOX
  43 #define main(argc, argv)        touch_main(argc, argv)
  44 #endif
  46 /* Flags */
  47 #define TF_NOCREAT      0x01    /* Do not create file */
  49 static void usage(void);
  50 static int do_touch(char *, unsigned int);
  52 int
main(int argc, char *argv[])
  54 {
  55         unsigned int flags;
  56         int ch;
flags = 0;
  59         while ((ch = getopt(argc, argv, "")) != -1)
  60                 switch(ch) {
  61                 case 'c':
flags |= TF_NOCREAT;
  63                         break;
  64                 case '?':
  65                 default:
usage();
  67                 }
argc -= optind;
argv += optind;
  71         if (argc == 0)
usage();
  74         do {
  75                 if (do_touch(*argv, flags))
err(1, NULL);
  77                 ++argv;
  78         } while (*argv);
exit(1);
  80 }
  82 static void
usage(void)
  84 {
fprintf(stderr, "usage: touch [-c] file...\n");
exit(1);
  87 }
  89 static int
do_touch(char *file, unsigned int flags)
  91 {
  92         struct stat st;
  93         int fd;
  95         if (stat(file, &st) < 0) {
  96                 if (!(flags & TF_NOCREAT)) {
  97                         if ((fd = creat(file, 0666)) < 0)
  98                                 return -1;
close(fd);
 100                 }
 101                 return 0;
 102         }
 103         if ((fd = open(file, 2)) < 0)
 104                 return -1;
 105         /* utime(file, NULL) */
close(fd);
 107         return 0;
 108 }