src/basename.c

   1 /* basename -- strip directory and suffix from filenames
   2    Copyright (C) 1990-1997, 1999-2004 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 Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "long-options.h"
  34 #include "dirname.h"
  35 #include "error.h"
  36
  37 /* The official name of this program (e.g., no `g' prefix).  */
  38 #define PROGRAM_NAME "basename"
  39
  40 #define AUTHORS "FIXME unknown"
  41
  42 /* The name this program was run with. */
  43 char *program_name;
  44
  45 void
  46 usage (int status)
  47 {
  48   if (status != EXIT_SUCCESS)
  49     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  50              program_name);
  51   else
  52     {
  53       printf (_("\
  54 Usage: %s NAME [SUFFIX]\n\
  55   or:  %s OPTION\n\
  56 "),
  57               program_name, program_name);
  58       fputs (_("\
  59 Print NAME with any leading directory components removed.\n\
  60 If specified, also remove a trailing SUFFIX.\n\
  61 \n\
  62 "), stdout);
  63       fputs (HELP_OPTION_DESCRIPTION, stdout);
  64       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  65       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  66     }
  67   exit (status);
  68 }
  69
  70 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
  71    consists entirely of SUFFIX. */
  72
  73 static void
  74 remove_suffix (char *name, const char *suffix)
  75 {
  76   char *np;
  77   const char *sp;
  78
  79   np = name + strlen (name);
  80   sp = suffix + strlen (suffix);
  81
  82   while (np > name && sp > suffix)
  83     if (*--np != *--sp)
  84       return;
  85   if (np > name)
  86     *np = '\0';
  87 }
  88
  89 int
  90 main (int argc, char **argv)
  91 {
  92   char *name;
  93
  94   initialize_main (&argc, &argv);
  95   program_name = argv[0];
  96   setlocale (LC_ALL, "");
  97   bindtextdomain (PACKAGE, LOCALEDIR);
  98   textdomain (PACKAGE);
  99
 100   atexit (close_stdout);
 101
 102   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
 103                       usage, AUTHORS, (char const *) NULL);
 104   /* The above handles --help and --version.
 105      Since there is no other invocation of getopt, handle `--' here.  */
 106   if (argc > 1 && STREQ (argv[1], "--"))
 107     {
 108       --argc;
 109       ++argv;
 110     }
 111
 112   if (argc <= 1 || argc > 3)
 113     {
 114       error (0, 0, (argc <= 1 ? _("too few arguments")
 115                     : _("too many arguments")));
 116       usage (EXIT_FAILURE);
 117     }
 118
 119   name = base_name (argv[1]);
 120   name[base_len (name)] = '\0';
 121
 122   if (argc == 3)
 123     remove_suffix (name, argv[2]);
 124
 125   puts (name);
 126
 127   exit (EXIT_SUCCESS);
 128 }