#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>

#include "lbx.h"

static const char *progname;
#define errmsg(fmt, ...) (\
	fprintf(stderr, "%s: " fmt ": %m.\n", progname, __VA_ARGS__)\
)

enum {
	MODE_NONE,
	MODE_LIST,
	MODE_EXTRACT,
};

int main(int argc, char **argv)
{
	int mode = MODE_NONE;
	FILE *f  = stdin;
	int opt;

	struct option longopts[] = {
		{ "list",    0, NULL, 'l' },
		{ "extract", 0, NULL, 'x' },

		{ "file",    1, NULL, 'f' },

		{ 0 }
	};

	progname = argv[0];
	while ((opt = getopt_long(argc, argv, "lxf:", longopts, NULL)) != -1) {
		switch(opt) {
		case 'l':
			mode = MODE_LIST;
			break;
		case 'x':
			mode = MODE_EXTRACT;
			break;
		case 'f':
			f = fopen(optarg, "rb");
			if (!f) {
				errmsg("failed to open file", 0, 4);
				return EXIT_FAILURE;
			}
			break;
		default:
			return EXIT_FAILURE;
		}
	}

	if (mode == MODE_NONE) {
		fprintf(stderr, "%s: you must specify a mode.\n", progname);
		return EXIT_FAILURE;
	}
}