1/* basename -- strip directory and suffix from file names
2   Copyright (C) 1990-1997, 1999-2010 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 3 of the License, or
7   (at your option) 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, see <http://www.gnu.org/licenses/>.  */
16
17/* Usage: basename name [suffix]
18   NAME is a file name; SUFFIX is a suffix to strip from it.
19
20   basename /usr/foo/lossage/functions.l
21   => functions.l
22   basename /usr/foo/lossage/functions.l .l
23   => functions
24   basename functions.lisp p
25   => functions.lis */
26
27#include <config.h>
28#include <getopt.h>
29#include <stdio.h>
30#include <sys/types.h>
31
32#include "system.h"
33#include "long-options.h"
34#include "error.h"
35#include "quote.h"
36
37/* The official name of this program (e.g., no `g' prefix).  */
38#define PROGRAM_NAME "basename"
39
40#define AUTHORS proper_name ("David MacKenzie")
41
42void
43usage (int status)
44{
45  if (status != EXIT_SUCCESS)
46    fprintf (stderr, _("Try `%s --help' for more information.\n"),
47             program_name);
48  else
49    {
50      printf (_("\
51Usage: %s NAME [SUFFIX]\n\
52  or:  %s OPTION\n\
53"),
54              program_name, program_name);
55      fputs (_("\
56Print NAME with any leading directory components removed.\n\
57If specified, also remove a trailing SUFFIX.\n\
58\n\
59"), stdout);
60      fputs (HELP_OPTION_DESCRIPTION, stdout);
61      fputs (VERSION_OPTION_DESCRIPTION, stdout);
62      printf (_("\
63\n\
64Examples:\n\
65  %s /usr/bin/sort       Output \"sort\".\n\
66  %s include/stdio.h .h  Output \"stdio\".\n\
67"),
68              program_name, program_name);
69      emit_ancillary_info ();
70    }
71  exit (status);
72}
73
74/* Remove SUFFIX from the end of NAME if it is there, unless NAME
75   consists entirely of SUFFIX. */
76
77static void
78remove_suffix (char *name, const char *suffix)
79{
80  char *np;
81  const char *sp;
82
83  np = name + strlen (name);
84  sp = suffix + strlen (suffix);
85
86  while (np > name && sp > suffix)
87    if (*--np != *--sp)
88      return;
89  if (np > name)
90    *np = '\0';
91}
92
93int
94main (int argc, char **argv)
95{
96  char *name;
97
98  initialize_main (&argc, &argv);
99  set_program_name (argv[0]);
100  setlocale (LC_ALL, "");
101  bindtextdomain (PACKAGE, LOCALEDIR);
102  textdomain (PACKAGE);
103
104  atexit (close_stdout);
105
106  parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
107                      usage, AUTHORS, (char const *) NULL);
108  if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
109    usage (EXIT_FAILURE);
110
111  if (argc < optind + 1)
112    {
113      error (0, 0, _("missing operand"));
114      usage (EXIT_FAILURE);
115    }
116
117  if (optind + 2 < argc)
118    {
119      error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
120      usage (EXIT_FAILURE);
121    }
122
123  name = base_name (argv[optind]);
124  strip_trailing_slashes (name);
125
126  /* Per POSIX, `basename // /' must return `//' on platforms with
127     distinct //.  On platforms with drive letters, this generalizes
128     to making `basename c: :' return `c:'.  This rule is captured by
129     skipping suffix stripping if base_name returned an absolute path
130     or a drive letter (only possible if name is a file-system
131     root).  */
132  if (argc == optind + 2 && IS_RELATIVE_FILE_NAME (name)
133      && ! FILE_SYSTEM_PREFIX_LEN (name))
134    remove_suffix (name, argv[optind + 1]);
135
136  puts (name);
137  free (name);
138
139  exit (EXIT_SUCCESS);
140}
141