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| Previous: <a rel="previous" accesskey="p" href="Getopt-Long-Options.html#Getopt-Long-Options">Getopt Long Options</a>, |
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| <h4 class="subsection">25.2.4 Example of Parsing Long Options with <code>getopt_long</code></h4> |
| |
| <pre class="smallexample"> #include <stdio.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| |
| /* <span class="roman">Flag set by ‘</span><samp><span class="samp">--verbose</span></samp><span class="roman">’.</span> */ |
| static int verbose_flag; |
| |
| int |
| main (argc, argv) |
| int argc; |
| char **argv; |
| { |
| int c; |
| |
| while (1) |
| { |
| static struct option long_options[] = |
| { |
| /* <span class="roman">These options set a flag.</span> */ |
| {"verbose", no_argument, &verbose_flag, 1}, |
| {"brief", no_argument, &verbose_flag, 0}, |
| /* <span class="roman">These options don't set a flag. |
| We distinguish them by their indices.</span> */ |
| {"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</code><span class="roman"> stores the option index here.</span> */ |
| int option_index = 0; |
| |
| c = getopt_long (argc, argv, "abc:d:f:", |
| long_options, &option_index); |
| |
| /* <span class="roman">Detect the end of the options.</span> */ |
| if (c == -1) |
| break; |
| |
| switch (c) |
| { |
| case 0: |
| /* <span class="roman">If this option set a flag, do nothing else now.</span> */ |
| 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</code><span class="roman"> already printed an error message.</span> */ |
| break; |
| |
| default: |
| abort (); |
| } |
| } |
| |
| /* <span class="roman">Instead of reporting ‘</span><samp><span class="samp">--verbose</span></samp><span class="roman">’ |
| and ‘</span><samp><span class="samp">--brief</span></samp><span class="roman">’ as they are encountered, |
| we report the final status resulting from them.</span> */ |
| if (verbose_flag) |
| puts ("verbose flag is set"); |
| |
| /* <span class="roman">Print any remaining command line arguments (not options).</span> */ |
| if (optind < argc) |
| { |
| printf ("non-option ARGV-elements: "); |
| while (optind < argc) |
| printf ("%s ", argv[optind++]); |
| putchar ('\n'); |
| } |
| |
| exit (0); |
| } |
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