usr.bin/basename/basename.c

   1 /*      $NetBSD: basename.c,v 1.13 2005/04/04 16:47:54 peter Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)basename.c  8.4 (Berkeley) 5/4/95";
  41 #endif
  42 __RCSID("$NetBSD: basename.c,v 1.13 2005/04/04 16:47:54 peter Exp $");
  43 #endif /* not lint */
  44
  45 #include <err.h>
  46 #include <libgen.h>
  47 #include <locale.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 static void usage(void);
  54
  55 int
  56 main(int argc, char **argv)
  57 {
  58         char *p;
  59         int ch;
  60
  61         setlocale(LC_ALL, "");
  62
  63         while ((ch = getopt(argc, argv, "")) != -1)
  64                 switch (ch) {
  65                 case '?':
  66                 default:
  67                         usage();
  68                 }
  69         argc -= optind;
  70         argv += optind;
  71
  72         if (argc != 1 && argc != 2)
  73                 usage();
  74
  75         if (**argv == '\0') {
  76                 (void)printf("\n");
  77                 exit(0);
  78         }
  79         if ((p = basename(*argv)) == NULL)
  80                 err(1, "%s", *argv);
  81         if (*++argv != '\0') {
  82                 int suffixlen, stringlen, off;
  83
  84                 suffixlen = strlen(*argv);
  85                 stringlen = strlen(p);
  86
  87                 if (suffixlen < stringlen) {
  88                         off = stringlen - suffixlen;
  89                         if (strcmp(p + off, *argv) == 0)
  90                                 p[off] = '\0';
  91                 }
  92         }
  93         (void)printf("%s\n", p);
  94         exit(0);
  95 }
  96
  97 static void
  98 usage(void)
  99 {
 100
 101         (void)fprintf(stderr, "usage: basename string [suffix]\n");
 102         exit(1);
 103 }