src/basename.c

   1 /* basename -- strip directory and suffix from file names
   2    Copyright (C) 1990-1997, 1999-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 /* Usage: basename name [suffix]
  19    NAME is a file name; 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 <getopt.h>
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32
  33 #include "system.h"
  34 #include "long-options.h"
  35 #include "error.h"
  36 #include "quote.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 != EXIT_SUCCESS)
  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 (_("\
  67 \n\
  68 Examples:\n\
  69   %s /usr/bin/sort       Output \"sort\".\n\
  70   %s include/stdio.h .h  Output \"stdio\".\n\
  71 "),
  72               program_name, program_name);
  73       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  74     }
  75   exit (status);
  76 }
  77
  78 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
  79    consists entirely of SUFFIX. */
  80
  81 static void
  82 remove_suffix (char *name, const char *suffix)
  83 {
  84   char *np;
  85   const char *sp;
  86
  87   np = name + strlen (name);
  88   sp = suffix + strlen (suffix);
  89
  90   while (np > name && sp > suffix)
  91     if (*--np != *--sp)
  92       return;
  93   if (np > name)
  94     *np = '\0';
  95 }
  96
  97 int
  98 main (int argc, char **argv)
  99 {
 100   char *name;
 101
 102   initialize_main (&argc, &argv);
 103   program_name = argv[0];
 104   setlocale (LC_ALL, "");
 105   bindtextdomain (PACKAGE, LOCALEDIR);
 106   textdomain (PACKAGE);
 107
 108   atexit (close_stdout);
 109
 110   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
 111                       usage, AUTHORS, (char const *) NULL);
 112   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
 113     usage (EXIT_FAILURE);
 114
 115   if (argc < optind + 1)
 116     {
 117       error (0, 0, _("missing operand"));
 118       usage (EXIT_FAILURE);
 119     }
 120
 121   if (optind + 2 < argc)
 122     {
 123       error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
 124       usage (EXIT_FAILURE);
 125     }
 126
 127   name = base_name (argv[optind]);
 128   strip_trailing_slashes (name);
 129
 130   /* Per POSIX, `basename // /' must return `//' on platforms with
 131      distinct //.  On platforms with drive letters, this generalizes
 132      to making `basename c: :' return `c:'.  This rule is captured by
 133      skipping suffix stripping if base_name returned an absolute path
 134      or a drive letter (only possible if name is a file-system
 135      root).  */
 136   if (argc == optind + 2 && IS_RELATIVE_FILE_NAME (name)
 137       && ! FILE_SYSTEM_PREFIX_LEN (name))
 138     remove_suffix (name, argv[optind + 1]);
 139
 140   puts (name);
 141   free (name);
 142
 143   exit (EXIT_SUCCESS);
 144 }