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-rw-r--r--manual/examples/longopt.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/manual/examples/longopt.c b/manual/examples/longopt.c
new file mode 100644
index 0000000000..d5c841f24a
--- /dev/null
+++ b/manual/examples/longopt.c
@@ -0,0 +1,92 @@
+#include <stdio.h>
+
+/* Flag set by @samp{--verbose}. */
+static int verbose_flag;
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+
+ while (1)
+ {
+ static struct option long_options[] =
+ {
+ /* These options set a flag. */
+ {"verbose", 0, &verbose_flag, 1},
+ {"brief", 0, &verbose_flag, 0},
+ /* These options don't set a flag.
+ We distinguish them by their indices. */
+ {"add", 1, 0, 0},
+ {"append", 0, 0, 0},
+ {"delete", 1, 0, 0},
+ {"create", 0, 0, 0},
+ {"file", 1, 0, 0},
+ {0, 0, 0, 0}
+ };
+ /* @code{getopt_long} stores the option index here. */
+ int option_index = 0;
+
+ c = getopt_long (argc, argv, "abc:d:",
+ 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 '?':
+ /* @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);
+}