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+/* Argp example #3 -- a program with options and arguments using argp */
+
+#include <argp.h>
+
+const char *argp_program_version =
+ "argp-ex3 1.0";
+const char *argp_program_bug_address =
+ "<bug-gnu-utils@@prep.ai.mit.edu>";
+
+/* Program documentation. */
+static char doc[] =
+ "Argp example #3 -- a program with options and arguments using argp";
+
+/* A description of the arguments we accept. */
+static char args_doc[] = "ARG1 ARG2";
+
+/* The options we understand. */
+static struct argp_option options[] = {
+ {"verbose", 'v', 0, 0, "Produce verbose output" },
+ {"quiet", 'q', 0, 0, "Don't produce any output" },
+ {"silent", 's', 0, OPTION_ALIAS },
+ {"output", 'o', "FILE", 0,
+ "Output to FILE instead of standard output" },
+ { 0 }
+};
+
+/* Used by @code{main} to communicate with @code{parse_opt}. */
+struct arguments
+{
+ char *args[2]; /* @var{arg1} & @var{arg2} */
+ int silent, verbose;
+ char *output_file;
+};
+
+/* Parse a single option. */
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+ /* Get the @var{input} argument from @code{argp_parse}, which we
+ know is a pointer to our arguments structure. */
+ struct arguments *arguments = state->input;
+
+ switch (key)
+ {
+ case 'q': case 's':
+ arguments->silent = 1;
+ break;
+ case 'v':
+ arguments->verbose = 1;
+ break;
+ case 'o':
+ arguments->output_file = arg;
+ break;
+
+ case ARGP_KEY_ARG:
+ if (state->arg_num >= 2)
+ /* Too many arguments. */
+ argp_usage (state);
+
+ arguments->args[state->arg_num] = arg;
+
+ break;
+
+ case ARGP_KEY_END:
+ if (state->arg_num < 2)
+ /* Not enough arguments. */
+ argp_usage (state);
+ break;
+
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+ return 0;
+}
+
+/* Our argp parser. */
+static struct argp argp = { options, parse_opt, args_doc, doc };
+
+int main (int argc, char **argv)
+{
+ struct arguments arguments;
+
+ /* Default values. */
+ arguments.silent = 0;
+ arguments.verbose = 0;
+ arguments.output_file = "-";
+
+ /* Parse our arguments; every option seen by @code{parse_opt} will
+ be reflected in @code{arguments}. */
+ argp_parse (&argp, argc, argv, 0, 0, &arguments);
+
+ printf ("ARG1 = %s\nARG2 = %s\nOUTPUT_FILE = %s\n"
+ "VERBOSE = %s\nSILENT = %s\n",
+ arguments.args[0], arguments.args[1],
+ arguments.output_file,
+ arguments.verbose ? "yes" : "no",
+ arguments.silent ? "yes" : "no");
+
+ exit (0);
+}