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 1.11 2007/08/28 15:36:44 pavalos 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 aflag, ch;
  59
  60         setlocale(LC_ALL, "");
  61
  62         aflag = 0;
  63         suffix = NULL;
  64         suffixlen = 0;
  65
  66         while ((ch = getopt(argc, argv, "as:")) != -1) {
  67                 switch(ch) {
  68                 case 'a':
  69                         aflag = 1;
  70                         break;
  71                 case 's':
  72                         suffix = optarg;
  73                         break;
  74                 case '?':
  75                 default:
  76                         usage();
  77                 }
  78         }
  79         argc -= optind;
  80         argv += optind;
  81
  82         if (argc < 1)
  83                 usage();
  84
  85         if (!*argv[0]) {
  86                 printf("\n");
  87                 exit(0);
  88         }
  89         if ((p = basename(argv[0])) == NULL)
  90                 err(1, "%s", argv[0]);
  91         if ((suffix == NULL && !aflag) && argc == 2) {
  92                 suffix = argv[1];
  93                 argc--;
  94         }
  95         if (suffix != NULL)
  96                 suffixlen = strlen(suffix);
  97         while (argc--) {
  98                 if ((p = basename(*argv)) == NULL)
  99                         err(1, "%s", argv[0]);
 100                 stripsuffix(p, suffix, suffixlen);
 101                 argv++;
 102                 printf("%s\n", p);
 103         }
 104         exit(0);
 105 }
 106
 107 void
 108 stripsuffix(char *p, const char *suffix, size_t suffixlen)
 109 {
 110         char *q;
 111 #ifndef NO_WCHAR
 112         char *r;
 113         mbstate_t mbs;
 114         size_t n;
 115 #endif
 116
 117         if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
 118             strcmp(suffix, q) == 0) {
 119 #ifndef NO_WCHAR
 120                 /* Ensure that the match occurred on a character boundary. */
 121                 memset(&mbs, 0, sizeof(mbs));
 122                 for (r = p; r < q; r += n) {
 123                         n = mbrlen(r, MB_LEN_MAX, &mbs);
 124                         if (n == (size_t)-1 || n == (size_t)-2) {
 125                                 memset(&mbs, 0, sizeof(mbs));
 126                                 n = 1;
 127                         }
 128                 }
 129                 /* Chop off the suffix. */
 130                 if (q == r)
 131 #endif
 132                         *q = '\0';
 133         }
 134 }
 135
 136 void
 137 usage(void)
 138 {
 139
 140         fprintf(stderr,
 141 "usage: basename string [suffix]\n"
 142 "       basename [-a] [-s suffix] string [...]\n");
 143         exit(1);
 144 }