114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
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/* Example of Parsing Long Options with getopt_long.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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/* Flag set by @samp{--verbose}. */
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static int verbose_flag;
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int
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main (int argc, char **argv)
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{
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int c;
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while (1)
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{
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static struct option long_options[] =
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{
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/* These options set a flag. */
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{"verbose", no_argument, &verbose_flag, 1},
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{"brief", no_argument, &verbose_flag, 0},
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/* These options don't set a flag.
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We distinguish them by their indices. */
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{"add", no_argument, 0, 'a'},
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{"append", no_argument, 0, 'b'},
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{"delete", required_argument, 0, 'd'},
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{"create", required_argument, 0, 'c'},
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{"file", required_argument, 0, 'f'},
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{0, 0, 0, 0}
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};
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/* @code{getopt_long} stores the option index here. */
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int option_index = 0;
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c = getopt_long (argc, argv, "abc:d:f:",
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long_options, &option_index);
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/* Detect the end of the options. */
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if (c == -1)
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break;
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switch (c)
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{
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case 0:
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/* If this option set a flag, do nothing else now. */
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if (long_options[option_index].flag != 0)
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break;
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printf ("option %s", long_options[option_index].name);
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if (optarg)
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printf (" with arg %s", optarg);
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printf ("\n");
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break;
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case 'a':
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puts ("option -a\n");
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break;
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case 'b':
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puts ("option -b\n");
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break;
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case 'c':
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printf ("option -c with value `%s'\n", optarg);
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break;
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case 'd':
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printf ("option -d with value `%s'\n", optarg);
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break;
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case 'f':
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printf ("option -f with value `%s'\n", optarg);
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break;
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case '?':
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/* @code{getopt_long} already printed an error message. */
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break;
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default:
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abort ();
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}
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}
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/* Instead of reporting @samp{--verbose}
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and @samp{--brief} as they are encountered,
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we report the final status resulting from them. */
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if (verbose_flag)
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puts ("verbose flag is set");
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/* Print any remaining command line arguments (not options). */
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if (optind < argc)
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{
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printf ("non-option ARGV-elements: ");
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while (optind < argc)
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printf ("%s ", argv[optind++]);
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putchar ('\n');
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}
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exit (0);
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}
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