1 | /* Example of Parsing Long Options with getopt_long. |
2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
3 | |
4 | This program is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU General Public License |
6 | as published by the Free Software Foundation; either version 2 |
7 | of the License, or (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 <https://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include <stdio.h> |
19 | #include <stdlib.h> |
20 | #include <getopt.h> |
21 | |
22 | /* Flag set by @samp{--verbose}. */ |
23 | static int verbose_flag; |
24 | |
25 | int |
26 | main (int argc, char **argv) |
27 | { |
28 | int c; |
29 | |
30 | while (1) |
31 | { |
32 | static struct option long_options[] = |
33 | { |
34 | /* These options set a flag. */ |
35 | {"verbose" , no_argument, &verbose_flag, 1}, |
36 | {"brief" , no_argument, &verbose_flag, 0}, |
37 | /* These options don't set a flag. |
38 | We distinguish them by their indices. */ |
39 | {"add" , no_argument, 0, 'a'}, |
40 | {"append" , no_argument, 0, 'b'}, |
41 | {"delete" , required_argument, 0, 'd'}, |
42 | {"create" , required_argument, 0, 'c'}, |
43 | {"file" , required_argument, 0, 'f'}, |
44 | {0, 0, 0, 0} |
45 | }; |
46 | /* @code{getopt_long} stores the option index here. */ |
47 | int option_index = 0; |
48 | |
49 | c = getopt_long (argc: argc, argv: argv, shortopts: "abc:d:f:" , |
50 | longopts: long_options, longind: &option_index); |
51 | |
52 | /* Detect the end of the options. */ |
53 | if (c == -1) |
54 | break; |
55 | |
56 | switch (c) |
57 | { |
58 | case 0: |
59 | /* If this option set a flag, do nothing else now. */ |
60 | if (long_options[option_index].flag != 0) |
61 | break; |
62 | printf (format: "option %s" , long_options[option_index].name); |
63 | if (optarg) |
64 | printf (format: " with arg %s" , optarg); |
65 | printf (format: "\n" ); |
66 | break; |
67 | |
68 | case 'a': |
69 | puts (s: "option -a\n" ); |
70 | break; |
71 | |
72 | case 'b': |
73 | puts (s: "option -b\n" ); |
74 | break; |
75 | |
76 | case 'c': |
77 | printf (format: "option -c with value `%s'\n" , optarg); |
78 | break; |
79 | |
80 | case 'd': |
81 | printf (format: "option -d with value `%s'\n" , optarg); |
82 | break; |
83 | |
84 | case 'f': |
85 | printf (format: "option -f with value `%s'\n" , optarg); |
86 | break; |
87 | |
88 | case '?': |
89 | /* @code{getopt_long} already printed an error message. */ |
90 | break; |
91 | |
92 | default: |
93 | abort (); |
94 | } |
95 | } |
96 | |
97 | /* Instead of reporting @samp{--verbose} |
98 | and @samp{--brief} as they are encountered, |
99 | we report the final status resulting from them. */ |
100 | if (verbose_flag) |
101 | puts (s: "verbose flag is set" ); |
102 | |
103 | /* Print any remaining command line arguments (not options). */ |
104 | if (optind < argc) |
105 | { |
106 | printf (format: "non-option ARGV-elements: " ); |
107 | while (optind < argc) |
108 | printf (format: "%s " , argv[optind++]); |
109 | putchar (c: '\n'); |
110 | } |
111 | |
112 | exit (0); |
113 | } |
114 | |