/*
 *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <stdio.h> /* printf */
#include <string.h>
#include <ctype.h>

#include "package.h"

#define BASENAME "highestver"

static void usage(void)
{
	fprintf(stderr, "usage: %s <ver1> <ver2> ... <verN>\n", BASENAME);
	fprintf(stderr, "prints the highest version.\n");
}

int main(int argc, char *argv[])
{
	int i;
	int ret;
	char *saved = NULL;

	if(argc == 1) {
		usage();
		return 2;
	}

	// only one argument given, that is the highest one
	if(argc == 2) {
		saved = strdup(argv[1]);
	}

	// fasten things up
	if(argc == 3) {
		ret = alpm_pkg_vercmp(argv[1], argv[2]);
		if(ret < 0) {
			saved = strdup(argv[2]);
		}
		if(ret == 0) {
			saved = strdup(argv[1]);
		}
		if(ret > 0) {
			saved = strdup(argv[1]);
		}
	}

	if(argc > 3) {
		for(i=1; i < argc; i++) {
			if (i == 1) {
				saved = strdup(argv[i]);
			}
			ret = alpm_pkg_vercmp(saved, argv[i+1]);
			// retval >0 or 0 means saved i the higher on, no need to strcmp
			if(ret < 0) {
				saved = strdup(argv[i+1]);
			}
		}
	}

	if(strlen(saved) > 0) {
		printf("%s\n", saved);
	}

	free(saved);
	return EXIT_SUCCESS;
}