src/basename.c

   1 /* basename -- strip directory and suffix from filenames
   2    Copyright (C) 1990-1997, 1999, 2000, 2001 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 #include "closeout.h"
  37
  38 /* The official name of this program (e.g., no `g' prefix).  */
  39 #define PROGRAM_NAME "basename"
  40
  41 #define AUTHORS "FIXME unknown"
  42
  43 /* The name this program was run with. */
  44 char *program_name;
  45
  46 void
  47 usage (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       fputs (_("\
  60 Print NAME with any leading directory components removed.\n\
  61 If specified, also remove a trailing SUFFIX.\n\
  62 \n\
  63 "), stdout);
  64       fputs (HELP_OPTION_DESCRIPTION, stdout);
  65       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  66       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  67     }
  68   exit (status);
  69 }
  70
  71 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
  72    consists entirely of SUFFIX. */
  73
  74 static void
  75 remove_suffix (char *name, const char *suffix)
  76 {
  77   char *np;
  78   const char *sp;
  79
  80   np = name + strlen (name);
  81   sp = suffix + strlen (suffix);
  82
  83   while (np > name && sp > suffix)
  84     if (*--np != *--sp)
  85       return;
  86   if (np > name)
  87     *np = '\0';
  88 }
  89
  90 int
  91 main (int argc, char **argv)
  92 {
  93   char *name;
  94
  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                       AUTHORS, usage);
 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 (1);
 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 (0);
 128 }