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
  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
  39
  40 #if 0
  41 #ifndef lint
  42 static char sccsid[] = "@(#)basename.c  8.4 (Berkeley) 5/4/95";
  43 #endif /* not lint */
  44 #endif
  45
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <err.h>
  50 #include <libgen.h>
  51 #include <limits.h>
  52 #include <locale.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57 #include <wchar.h>
  58
  59 void stripsuffix(char *, const char *, size_t);
  60 void usage(void);
  61
  62 int
  63 main(int argc, char **argv)
  64 {
  65         char *p, *suffix;
  66         size_t suffixlen;
  67         int aflag, ch;
  68
  69         setlocale(LC_ALL, "");
  70
  71         aflag = 0;
  72         suffix = NULL;
  73         suffixlen = 0;
  74
  75         while ((ch = getopt(argc, argv, "as:")) != -1)
  76                 switch(ch) {
  77                 case 'a':
  78                         aflag = 1;
  79                         break;
  80                 case 's':
  81                         suffix = optarg;
  82                         break;
  83                 case '?':
  84                 default:
  85                         usage();
  86                 }
  87         argc -= optind;
  88         argv += optind;
  89
  90         if (argc < 1)
  91                 usage();
  92
  93         if (!*argv[0]) {
  94                 printf("\n");
  95                 exit(0);
  96         }
  97         if ((p = basename(argv[0])) == NULL)
  98                 err(1, "%s", argv[0]);
  99         if ((suffix == NULL && !aflag) && argc == 2) {
 100                 suffix = argv[1];
 101                 argc--;
 102         }
 103         if (suffix != NULL)
 104                 suffixlen = strlen(suffix);
 105         while (argc--) {
 106                 if ((p = basename(*argv)) == NULL)
 107                         err(1, "%s", argv[0]);
 108                 stripsuffix(p, suffix, suffixlen);
 109                 argv++;
 110                 (void)printf("%s\n", p);
 111         }
 112         exit(0);
 113 }
 114
 115 void
 116 stripsuffix(char *p, const char *suffix, size_t suffixlen)
 117 {
 118         char *q, *r;
 119         mbstate_t mbs;
 120         size_t n;
 121
 122         if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
 123             strcmp(suffix, q) == 0) {
 124                 /* Ensure that the match occurred on a character boundary. */
 125                 memset(&mbs, 0, sizeof(mbs));
 126                 for (r = p; r < q; r += n) {
 127                         n = mbrlen(r, MB_LEN_MAX, &mbs);
 128                         if (n == (size_t)-1 || n == (size_t)-2) {
 129                                 memset(&mbs, 0, sizeof(mbs));
 130                                 n = 1;
 131                         }
 132                 }
 133                 /* Chop off the suffix. */
 134                 if (q == r)
 135                         *q = '\0';
 136         }
 137 }
 138
 139 void
 140 usage(void)
 141 {
 142
 143         (void)fprintf(stderr,
 144 "usage: basename string [suffix]\n"
 145 "       basename [-a] [-s suffix] string [...]\n");
 146         exit(1);
 147 }