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Annotation of prex-old/usr/bin/touch/touch.c, Revision 1.1.1.1

1.1       nbrk        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:  */
                     29:
                     30: #include <sys/mount.h>
                     31: #include <sys/stat.h>
                     32: #include <sys/fcntl.h>
                     33:
                     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>
                     41:
                     42: #ifdef CMDBOX
                     43: #define main(argc, argv)       touch_main(argc, argv)
                     44: #endif
                     45:
                     46: /* Flags */
                     47: #define TF_NOCREAT     0x01    /* Do not create file */
                     48:
                     49: static void usage(void);
                     50: static int do_touch(char *, unsigned int);
                     51:
                     52: int
                     53: main(int argc, char *argv[])
                     54: {
                     55:        unsigned int flags;
                     56:        int ch;
                     57:
                     58:        flags = 0;
                     59:        while ((ch = getopt(argc, argv, "")) != -1)
                     60:                switch(ch) {
                     61:                case 'c':
                     62:                        flags |= TF_NOCREAT;
                     63:                        break;
                     64:                case '?':
                     65:                default:
                     66:                        usage();
                     67:                }
                     68:        argc -= optind;
                     69:        argv += optind;
                     70:
                     71:        if (argc == 0)
                     72:                usage();
                     73:
                     74:        do {
                     75:                if (do_touch(*argv, flags))
                     76:                        err(1, NULL);
                     77:                ++argv;
                     78:        } while (*argv);
                     79:        exit(1);
                     80: }
                     81:
                     82: static void
                     83: usage(void)
                     84: {
                     85:        fprintf(stderr, "usage: touch [-c] file...\n");
                     86:        exit(1);
                     87: }
                     88:
                     89: static int
                     90: do_touch(char *file, unsigned int flags)
                     91: {
                     92:        struct stat st;
                     93:        int fd;
                     94:
                     95:        if (stat(file, &st) < 0) {
                     96:                if (!(flags & TF_NOCREAT)) {
                     97:                        if ((fd = creat(file, 0666)) < 0)
                     98:                                return -1;
                     99:                        close(fd);
                    100:                }
                    101:                return 0;
                    102:        }
                    103:        if ((fd = open(file, 2)) < 0)
                    104:                return -1;
                    105:        /* utime(file, NULL) */
                    106:        close(fd);
                    107:        return 0;
                    108: }