usr.bin/basename/basename.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  * $FreeBSD: src/usr.bin/basename/basename.c,v 1.15 2004/07/15 06:15:10 tjr Exp $
  34  * $DragonFly: src/usr.bin/basename/basename.c,v 1.10 2005/09/28 00:35:51 corecode Exp $
  35  *
  36  * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  37  * @(#)basename.c       8.4 (Berkeley) 5/4/95
  38  */
  39
  40 #include <err.h>
  41 #include <libgen.h>
  42 #include <limits.h>
  43 #include <locale.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48 #include <wchar.h>
  49
  50 void stripsuffix(char *, const char *, size_t);
  51 void usage(void);
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         char *p, *suffix;
  57         size_t suffixlen;
  58         int ch;
  59
  60         setlocale(LC_ALL, "");
  61
  62         suffix = NULL;
  63         suffixlen = 0;
  64
  65         while ((ch = getopt(argc, argv, "")) != -1) {
  66                 switch(ch) {
  67                 case '?':
  68                 default:
  69                         usage();
  70                 }
  71         }
  72         argc -= optind;
  73         argv += optind;
  74
  75         if (argc != 1 && argc != 2)
  76                 usage();
  77
  78         if (!*argv[0]) {
  79                 printf("\n");
  80                 exit(0);
  81         }
  82         if ((p = basename(argv[0])) == NULL)
  83                 err(1, "%s", argv[0]);
  84         if (argc == 2) {
  85                 suffix = argv[1];
  86                 suffixlen = strlen(argv[1]);
  87         }
  88         stripsuffix(p, suffix, suffixlen);
  89         printf("%s\n", p);
  90         return (0);
  91 }
  92
  93 void
  94 stripsuffix(char *p, const char *suffix, size_t suffixlen)
  95 {
  96         char *q;
  97 #ifndef NO_WCHAR
  98         char *r;
  99         mbstate_t mbs;
 100         size_t n;
 101 #endif
 102
 103         if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
 104             strcmp(suffix, q) == 0) {
 105 #ifndef NO_WCHAR
 106                 /* Ensure that the match occurred on a character boundary. */
 107                 memset(&mbs, 0, sizeof(mbs));
 108                 for (r = p; r < q; r += n) {
 109                         n = mbrlen(r, MB_LEN_MAX, &mbs);
 110                         if (n == (size_t)-1 || n == (size_t)-2) {
 111                                 memset(&mbs, 0, sizeof(mbs));
 112                                 n = 1;
 113                         }
 114                 }
 115                 /* Chop off the suffix. */
 116                 if (q == r)
 117 #endif
 118                         *q = '\0';
 119         }
 120 }
 121
 122 void
 123 usage(void)
 124 {
 125
 126         fprintf(stderr, "usage: basename string [suffix]\n");
 127         exit(1);
 128 }