shell_cmds/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 __RCSID("$FreeBSD: src/usr.bin/basename/basename.c,v 1.14 2002/09/04 23:28:52 dwmalone Exp $");
  48
  49 #include <err.h>
  50 #include <libgen.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 void usage(void);
  57
  58 int
  59 main(int argc, char **argv)
  60 {
  61         char *p, *q, *suffix;
  62         size_t suffixlen;
  63         int aflag, ch;
  64
  65         aflag = 0;
  66         suffix = NULL;
  67         suffixlen = 0;
  68
  69         while ((ch = getopt(argc, argv, "as:")) != -1)
  70                 switch(ch) {
  71                 case 'a':
  72                         aflag = 1;
  73                         break;
  74                 case 's':
  75                         suffix = optarg;
  76                         break;
  77                 case '?':
  78                 default:
  79                         usage();
  80                 }
  81         argc -= optind;
  82         argv += optind;
  83
  84         if (argc < 1)
  85                 usage();
  86
  87         if (!*argv[0]) {
  88                 printf("\n");
  89                 exit(0);
  90         }
  91         if ((p = basename(argv[0])) == NULL)
  92                 err(1, "%s", argv[0]);
  93         if ((suffix == NULL && !aflag) && argc == 2) {
  94                 suffix = argv[1];
  95                 argc--;
  96         }
  97         if (suffix != NULL)
  98                 suffixlen = strlen(suffix);
  99         while (argc--) {
 100                 if ((p = basename(*argv)) == NULL)
 101                         err(1, "%s", argv[0]);
 102                 if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
 103                     strcmp(suffix, q) == 0)
 104                         *q = '\0';
 105                 argv++;
 106                 (void)printf("%s\n", p);
 107         }
 108         exit(0);
 109 }
 110
 111 void
 112 usage(void)
 113 {
 114
 115         (void)fprintf(stderr,
 116 "usage: basename string [suffix]\n"
 117 "       basename [-a] [-s suffix] string [...]\n");
 118         exit(1);
 119 }