diff options
Diffstat (limited to 'REORG.TODO/manual/examples/longopt.c')
-rw-r--r-- | REORG.TODO/manual/examples/longopt.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/REORG.TODO/manual/examples/longopt.c b/REORG.TODO/manual/examples/longopt.c new file mode 100644 index 0000000000..40967174aa --- /dev/null +++ b/REORG.TODO/manual/examples/longopt.c @@ -0,0 +1,113 @@ +/* Example of Parsing Long Options with getopt_long. + Copyright (C) 1991-2017 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, if not, see <http://www.gnu.org/licenses/>. +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <getopt.h> + +/* Flag set by @samp{--verbose}. */ +static int verbose_flag; + +int +main (int argc, char **argv) +{ + int c; + + while (1) + { + static struct option long_options[] = + { + /* These options set a flag. */ + {"verbose", no_argument, &verbose_flag, 1}, + {"brief", no_argument, &verbose_flag, 0}, + /* These options don't set a flag. + We distinguish them by their indices. */ + {"add", no_argument, 0, 'a'}, + {"append", no_argument, 0, 'b'}, + {"delete", required_argument, 0, 'd'}, + {"create", required_argument, 0, 'c'}, + {"file", required_argument, 0, 'f'}, + {0, 0, 0, 0} + }; + /* @code{getopt_long} stores the option index here. */ + int option_index = 0; + + c = getopt_long (argc, argv, "abc:d:f:", + long_options, &option_index); + + /* Detect the end of the options. */ + if (c == -1) + break; + + switch (c) + { + case 0: + /* If this option set a flag, do nothing else now. */ + if (long_options[option_index].flag != 0) + break; + printf ("option %s", long_options[option_index].name); + if (optarg) + printf (" with arg %s", optarg); + printf ("\n"); + break; + + case 'a': + puts ("option -a\n"); + break; + + case 'b': + puts ("option -b\n"); + break; + + case 'c': + printf ("option -c with value `%s'\n", optarg); + break; + + case 'd': + printf ("option -d with value `%s'\n", optarg); + break; + + case 'f': + printf ("option -f with value `%s'\n", optarg); + break; + + case '?': + /* @code{getopt_long} already printed an error message. */ + break; + + default: + abort (); + } + } + + /* Instead of reporting @samp{--verbose} + and @samp{--brief} as they are encountered, + we report the final status resulting from them. */ + if (verbose_flag) + puts ("verbose flag is set"); + + /* Print any remaining command line arguments (not options). */ + if (optind < argc) + { + printf ("non-option ARGV-elements: "); + while (optind < argc) + printf ("%s ", argv[optind++]); + putchar ('\n'); + } + + exit (0); +} |