maint: revert "build: update gnulib submodule to latest"
[coreutils/ericb.git] / src / basename.c
blobddddff3461d0f02993c1762f6dad7419afbfb563
1 /* basename -- strip directory and suffix from file names
2 Copyright (C) 1990-1997, 1999-2011 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Usage: basename name [suffix]
18 NAME is a file name; SUFFIX is a suffix to strip from it.
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 */
27 #include <config.h>
28 #include <getopt.h>
29 #include <stdio.h>
30 #include <sys/types.h>
32 #include "system.h"
33 #include "long-options.h"
34 #include "error.h"
35 #include "quote.h"
37 /* The official name of this program (e.g., no `g' prefix). */
38 #define PROGRAM_NAME "basename"
40 #define AUTHORS proper_name ("David MacKenzie")
42 void
43 usage (int status)
45 if (status != EXIT_SUCCESS)
46 fprintf (stderr, _("Try `%s --help' for more information.\n"),
47 program_name);
48 else
50 printf (_("\
51 Usage: %s NAME [SUFFIX]\n\
52 or: %s OPTION\n\
53 "),
54 program_name, program_name);
55 fputs (_("\
56 Print NAME with any leading directory components removed.\n\
57 If 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\
64 Examples:\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 ();
71 exit (status);
74 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
75 consists entirely of SUFFIX. */
77 static void
78 remove_suffix (char *name, const char *suffix)
80 char *np;
81 const char *sp;
83 np = name + strlen (name);
84 sp = suffix + strlen (suffix);
86 while (np > name && sp > suffix)
87 if (*--np != *--sp)
88 return;
89 if (np > name)
90 *np = '\0';
93 int
94 main (int argc, char **argv)
96 char *name;
98 initialize_main (&argc, &argv);
99 set_program_name (argv[0]);
100 setlocale (LC_ALL, "");
101 bindtextdomain (PACKAGE, LOCALEDIR);
102 textdomain (PACKAGE);
104 atexit (close_stdout);
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);
111 if (argc < optind + 1)
113 error (0, 0, _("missing operand"));
114 usage (EXIT_FAILURE);
117 if (optind + 2 < argc)
119 error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
120 usage (EXIT_FAILURE);
123 name = base_name (argv[optind]);
124 strip_trailing_slashes (name);
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]);
136 puts (name);
137 free (name);
139 exit (EXIT_SUCCESS);