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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/usr.bin/basename/basename.c,v 1.15 2004/07/15 06:15:10 tjr Exp $
  30  *
  31  * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  32  * @(#)basename.c       8.4 (Berkeley) 5/4/95
  33  */
  34
  35 #include <err.h>
  36 #include <libgen.h>
  37 #include <limits.h>
  38 #include <locale.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <wchar.h>
  44
  45 static void stripsuffix(char *, const char *, size_t);
  46 static void usage(void) __dead2;
  47
  48 int
  49 main(int argc, char **argv)
  50 {
  51         char *p, *suffix;
  52         size_t suffixlen;
  53         int aflag, ch;
  54
  55         setlocale(LC_ALL, "");
  56
  57         aflag = 0;
  58         suffix = NULL;
  59         suffixlen = 0;
  60
  61         while ((ch = getopt(argc, argv, "as:")) != -1) {
  62                 switch(ch) {
  63                 case 'a':
  64                         aflag = 1;
  65                         break;
  66                 case 's':
  67                         suffix = optarg;
  68                         break;
  69                 case '?':
  70                 default:
  71                         usage();
  72                 }
  73         }
  74         argc -= optind;
  75         argv += optind;
  76
  77         if (argc < 1)
  78                 usage();
  79
  80         if (!*argv[0]) {
  81                 printf("\n");
  82                 exit(0);
  83         }
  84         if ((p = basename(argv[0])) == NULL)
  85                 err(1, "%s", argv[0]);
  86         if ((suffix == NULL && !aflag) && argc == 2) {
  87                 suffix = argv[1];
  88                 argc--;
  89         }
  90         if (suffix != NULL)
  91                 suffixlen = strlen(suffix);
  92         while (argc--) {
  93                 if ((p = basename(*argv)) == NULL)
  94                         err(1, "%s", argv[0]);
  95                 stripsuffix(p, suffix, suffixlen);
  96                 argv++;
  97                 printf("%s\n", p);
  98         }
  99         exit(0);
 100 }
 101
 102 static void
 103 stripsuffix(char *p, const char *suffix, size_t suffixlen)
 104 {
 105         char *q;
 106         char *r;
 107         mbstate_t mbs;
 108         size_t n;
 109
 110         if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
 111             strcmp(suffix, q) == 0) {
 112                 /* Ensure that the match occurred on a character boundary. */
 113                 memset(&mbs, 0, sizeof(mbs));
 114                 for (r = p; r < q; r += n) {
 115                         n = mbrlen(r, MB_LEN_MAX, &mbs);
 116                         if (n == (size_t)-1 || n == (size_t)-2) {
 117                                 memset(&mbs, 0, sizeof(mbs));
 118                                 n = 1;
 119                         }
 120                 }
 121                 /* Chop off the suffix. */
 122                 if (q == r)
 123                         *q = '\0';
 124         }
 125 }
 126
 127 static void
 128 usage(void)
 129 {
 130
 131         fprintf(stderr,
 132 "usage: basename string [suffix]\n"
 133 "       basename [-a] [-s suffix] string [...]\n");
 134         exit(1);
 135 }