1 /* dirname -- strip suffix from file name
2
3 Copyright (C) 1990-2023 Free Software Foundation, Inc.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 /* Written by David MacKenzie and Jim Meyering. */
19
20 #include <config.h>
21 #include <getopt.h>
22 #include <stdio.h>
23 #include <sys/types.h>
24
25 #include "system.h"
26
27 /* The official name of this program (e.g., no 'g' prefix). */
28 #define PROGRAM_NAME "dirname"
29
30 #define AUTHORS \
31 proper_name ("David MacKenzie"), \
32 proper_name ("Jim Meyering")
33
34 static struct option const longopts[] =
35 {
36 {"zero", no_argument, nullptr, 'z'},
37 {GETOPT_HELP_OPTION_DECL},
38 {GETOPT_VERSION_OPTION_DECL},
39 {nullptr, 0, nullptr, 0}
40 };
41
42 void
usage(int status)43 usage (int status)
44 {
45 if (status != EXIT_SUCCESS)
46 emit_try_help ();
47 else
48 {
49 printf (_("\
50 Usage: %s [OPTION] NAME...\n\
51 "),
52 program_name);
53 fputs (_("\
54 Output each NAME with its last non-slash component and trailing slashes\n\
55 removed; if NAME contains no /'s, output '.' (meaning the current directory).\n\
56 \n\
57 "), stdout);
58 fputs (_("\
59 -z, --zero end each output line with NUL, not newline\n\
60 "), stdout);
61 fputs (HELP_OPTION_DESCRIPTION, stdout);
62 fputs (VERSION_OPTION_DESCRIPTION, stdout);
63 printf (_("\
64 \n\
65 Examples:\n\
66 %s /usr/bin/ -> \"/usr\"\n\
67 %s dir1/str dir2/str -> \"dir1\" followed by \"dir2\"\n\
68 %s stdio.h -> \".\"\n\
69 "),
70 program_name, program_name, program_name);
71 emit_ancillary_info (PROGRAM_NAME);
72 }
73 exit (status);
74 }
75
76 int
main(int argc,char ** argv)77 main (int argc, char **argv)
78 {
79 static char const dot = '.';
80 bool use_nuls = false;
81 char const *result;
82 size_t len;
83
84 initialize_main (&argc, &argv);
85 set_program_name (argv[0]);
86 setlocale (LC_ALL, "");
87 bindtextdomain (PACKAGE, LOCALEDIR);
88 textdomain (PACKAGE);
89
90 atexit (close_stdout);
91
92 while (true)
93 {
94 int c = getopt_long (argc, argv, "z", longopts, nullptr);
95
96 if (c == -1)
97 break;
98
99 switch (c)
100 {
101 case 'z':
102 use_nuls = true;
103 break;
104
105 case_GETOPT_HELP_CHAR;
106 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
107
108 default:
109 usage (EXIT_FAILURE);
110 }
111 }
112
113 if (argc < optind + 1)
114 {
115 error (0, 0, _("missing operand"));
116 usage (EXIT_FAILURE);
117 }
118
119 for (; optind < argc; optind++)
120 {
121 result = argv[optind];
122 len = dir_len (result);
123
124 if (! len)
125 {
126 result = ˙
127 len = 1;
128 }
129
130 fwrite (result, 1, len, stdout);
131 putchar (use_nuls ? '\0' :'\n');
132 }
133
134 return EXIT_SUCCESS;
135 }
136