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/*
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 * Copyright (c) 2005-2007, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <unistd.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <stdio.h>
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#ifdef CMDBOX
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#define main(argc, argv)        touch_main(argc, argv)
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#endif
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/* Flags */
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#define TF_NOCREAT        0x01        /* Do not create file */
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static void usage(void);
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static int do_touch(char *, unsigned int);
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int
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main(int argc, char *argv[])
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{
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        unsigned int flags;
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        int ch;
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        flags = 0;
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        while ((ch = getopt(argc, argv, "")) != -1)
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                switch(ch) {
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                case 'c':
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                        flags |= TF_NOCREAT;
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                        break;
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                case '?':
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                default:
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                        usage();
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                }
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        argc -= optind;
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        argv += optind;
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        if (argc == 0)
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                usage();
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        do {
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                if (do_touch(*argv, flags))
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                        err(1, NULL);
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                ++argv;
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        } while (*argv);
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        exit(1);
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}
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static void
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usage(void)
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{
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        fprintf(stderr, "usage: touch [-c] file...\n");
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        exit(1);
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}
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static int
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do_touch(char *file, unsigned int flags)
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{
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        struct stat st;
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        int fd;
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        if (stat(file, &st) < 0) {
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                if (!(flags & TF_NOCREAT)) {
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                        if ((fd = creat(file, 0666)) < 0)
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                                return -1;
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                        close(fd);
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                }
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                return 0;
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        }
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        if ((fd = open(file, 2)) < 0)
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                return -1;
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        /* utime(file, NULL) */
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        close(fd);
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        return 0;
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}