ccan/ccan/jmap/_info

#include "config.h"
#include <stdio.h>
#include <string.h>

/**
 * jmap - map from indices to values (based on libJudy)
 *
 * This provides a convenient wrapper for using JudyL arrays; using
 * integers or pointers as an index, Judy arrays provide an efficient
 * map to integers or pointers.
 *
 * You define a struct for your particular index and value types using
 * the JMAP_MEMBERS macro, then use the jmap routines to manipulate
 * the mapping.
 *
 * Note: if you use an integer type for the index or value types and
 * your compiler doesn't support "typeof", you will get warnings about
 * mixing pointers and integers.
 *
 * Example:
 * // Silly example of associating data with arguments by pointer and int.
 * #include <string.h>
 * #include <stdio.h>
 * #include <ccan/jmap/jmap.h>
 * 
 * struct opt_detail {
 * 	bool is_long;
 * 	size_t length; // == 1 if !is_long.
 * };
 * 
 * // Define map type for int -> argv.
 * struct arg_map {
 *	JMAP_MEMBERS(int, char *);
 * };
 * // Define map type for argv -> struct opt_detail *.
 * struct opt_map {
 *	JMAP_MEMBERS(char *, struct opt_detail *);
 * };
 * 
 * int main(int argc, char *argv[])
 * {
 * 	int i;
 * 	// This map is equivalent to the argv[] array.  Silly example.
 * 	struct arg_map *arg = jmap_new(struct arg_map);
 * 	struct opt_map *opt = jmap_new(struct opt_map);
 * 	struct opt_detail *d;
 * 
 * 	// Note: this is not correct for real parsing!
 * 	for (i = 1; i < argc; i++) {
 * 		jmap_add(arg, i, argv[i]);
 * 		if (argv[i][0] != '-')
 * 			continue;
 * 		d = malloc(sizeof(*d));
 * 		if (argv[i][1] == '-') {
 * 			// --<stuff>
 * 			d->is_long = true;
 * 			d->length = strlen(argv[i]+2);
 * 		} else {
 * 			// -<opt1>
 * 			d->is_long = false;
 * 			d->length = 1;
 * 		}
 * 		jmap_add(opt, argv[i], d);
 * 	}
 * 
 * 	printf("Found %lu options:\n", jmap_count(opt));
 * 	for (i = jmap_first(arg); i; i = jmap_next(arg,i)) {
 * 		char *a = jmap_get(arg, i);
 * 		d = jmap_get(opt, a);
 * 		printf("  Arg %i ('%s') is a %s of %zu chars\n",
 * 		       i, a,
 * 		       d == NULL ? "normal arg"
 * 		       : d->is_long ? "long opt"
 * 		       : "short opt",
 * 		       d == NULL ? strlen(a) : d->length);
 * 		// We no longer need it, so free it here.
 * 		free(d);
 * 	}
 * 	jmap_free(opt);
 * 	jmap_free(arg);
 * 	return 0;
 * }
 * // Given "--help" output contains "Arg 1 ('--help') is a long opt of 4 chars"
 * // Given "-h" output contains "Arg 1 ('-h') is a short opt of 1 chars"
 * // Given "foo" output contains "Arg 1 ('foo') is a normal arg of 3 chars"
 *
 * License: LGPL (v2.1 or any later version)
 * Author: Rusty Russell <rusty@rustcorp.com.au>
 */
int main(int argc, char *argv[])
{
	if (argc != 2)
		return 1;

	if (strcmp(argv[1], "depends") == 0) {
		printf("ccan/build_assert\n");
		printf("ccan/compiler\n");
		printf("ccan/tcon\n");
		printf("Judy\n");
		return 0;
	}

	if (strcmp(argv[1], "libs") == 0) {
		printf("Judy\n");
		return 0;
	}

	return 1;
}