shell_cmds/dirname/dirname.c

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1991, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 static const char sccsid[] = "@(#)dirname.c     8.4 (Berkeley) 5/4/95";
  42 #endif /* not lint */
  43 #include <sys/cdefs.h>
  44 __RCSID("$FreeBSD: src/usr.bin/dirname/dirname.c,v 1.11 2002/07/28 15:43:56 dwmalone Exp $");
  45
  46 #include <err.h>
  47 #include <libgen.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <unistd.h>
  51
  52 void usage(void);
  53
  54 int
  55 main(int argc, char **argv)
  56 {
  57         char *p;
  58         int ch;
  59
  60         while ((ch = getopt(argc, argv, "")) != -1)
  61                 switch(ch) {
  62                 case '?':
  63                 default:
  64                         usage();
  65                 }
  66         argc -= optind;
  67         argv += optind;
  68
  69         if (argc != 1)
  70                 usage();
  71
  72         if ((p = dirname(*argv)) == NULL)
  73                 err(1, "%s", *argv);
  74         (void)printf("%s\n", p);
  75         exit(0);
  76 }
  77
  78 void
  79 usage(void)
  80 {
  81
  82         (void)fprintf(stderr, "usage: dirname path\n");
  83         exit(1);
  84 }