| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Example of Parsing Long Options with getopt_long. |
| 2 | Copyright (C) 1991-2016 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, if not, see <http://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, argv, "abc:d:f:", |
| 50 | long_options, &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 ("option %s", long_options[option_index].name); |
| 63 | if (optarg) |
| 64 | printf (" with arg %s", optarg); |
| 65 | printf ("\n"); |
| 66 | break; |
| 67 | |
| 68 | case 'a': |
| 69 | puts ("option -a\n"); |
| 70 | break; |
| 71 | |
| 72 | case 'b': |
| 73 | puts ("option -b\n"); |
| 74 | break; |
| 75 | |
| 76 | case 'c': |
| 77 | printf ("option -c with value `%s'\n", optarg); |
| 78 | break; |
| 79 | |
| 80 | case 'd': |
| 81 | printf ("option -d with value `%s'\n", optarg); |
| 82 | break; |
| 83 | |
| 84 | case 'f': |
| 85 | printf ("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 ("verbose flag is set"); |
| 102 | |
| 103 | /* Print any remaining command line arguments (not options). */ |
| 104 | if (optind < argc) |
| 105 | { |
| 106 | printf ("non-option ARGV-elements: "); |
| 107 | while (optind < argc) |
| 108 | printf ("%s ", argv[optind++]); |
| 109 | putchar ('\n'); |
| 110 | } |
| 111 | |
| 112 | exit (0); |
| 113 | } |