src/basename.c

   1 /* basename -- strip directory and suffix from filenames
   2    Copyright (C) 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Usage: basename name [suffix]
  19    NAME is a pathname; SUFFIX is a suffix to strip from it.
  20
  21    basename /usr/foo/lossage/functions.l
  22    => functions.l
  23    basename /usr/foo/lossage/functions.l .l
  24    => functions
  25    basename functions.lisp p
  26    => functions.lis */
  27
  28 #include <config.h>
  29 #include <stdio.h>
  30 #include <sys/types.h>
  31
  32 #include "system.h"
  33 #include "version.h"
  34 #include "long-options.h"
  35 #include "error.h"
  36
  37 char *basename ();
  38 void strip_trailing_slashes ();
  39
  40 static void remove_suffix ();
  41
  42 /* The name this program was run with. */
  43 char *program_name;
  44
  45 static void
  46 usage (status)
  47      int status;
  48 {
  49   if (status != 0)
  50     fprintf (stderr, "Try `%s --help' for more information.\n",
  51              program_name);
  52   else
  53     {
  54       printf ("\
  55 Usage: %s NAME [SUFFIX]\n\
  56   or:  %s OPTION\n\
  57 ",
  58               program_name, program_name);
  59       printf ("\
  60 Print NAME with any leading directory components removed.\n\
  61 If specified, also remove a trailing SUFFIX.\n\
  62 \n\
  63   --help      display this help and exit\n\
  64   --version   output version information and exit\n\
  65 ");
  66     }
  67   exit (status);
  68 }
  69
  70 void
  71 main (argc, argv)
  72      int argc;
  73      char **argv;
  74 {
  75   char *name;
  76
  77   program_name = argv[0];
  78
  79   parse_long_options (argc, argv, "basename", version_string, usage);
  80
  81   if (argc == 1 || argc > 3)
  82     {
  83       error (0, 0, "too %s arguments", argc == 1 ? "few" : "many");
  84       usage (1);
  85     }
  86
  87   strip_trailing_slashes (argv[1]);
  88
  89   name = basename (argv[1]);
  90
  91   if (argc == 3)
  92     remove_suffix (name, argv[2]);
  93
  94   puts (name);
  95
  96   exit (0);
  97 }
  98
  99 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
 100    consists entirely of SUFFIX. */
 101
 102 static void
 103 remove_suffix (name, suffix)
 104      register char *name, *suffix;
 105 {
 106   register char *np, *sp;
 107
 108   np = name + strlen (name);
 109   sp = suffix + strlen (suffix);
 110
 111   while (np > name && sp > suffix)
 112     if (*--np != *--sp)
 113       return;
 114   if (np > name)
 115     *np = '\0';
 116 }