/* *****************************************************************************
 * utils/version.c -- decode and encode a version.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libg1m.
 * libg1m is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3.0 of the License,
 * or (at your option) any later version.
 *
 * libg1m 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libg1m; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************** */
#include <libg1m/internals.h>
#include <ctype.h>

/**
 *	g1m_check_version:
 *	Check if a version string is well formatted.
 *
 *	@arg	raw		the string to check.
 *	@return			if there was an error.
 */

int g1m_check_version(const char *raw)
{
	/* check length */
	if (memchr(raw, 0, 10)) return (g1m_error_op);

	/* check characters */
	if (!isdigit(raw[0]) || !isdigit(raw[1]) || raw[2] != '.'
	 || !isdigit(raw[3]) || !isdigit(raw[4]) || raw[5] != '.'
	 || !isdigit(raw[6]) || !isdigit(raw[7])
	 || !isdigit(raw[8]) || !isdigit(raw[9]))
		return (g1m_error_op);

	/* no error! */
	return (0);
}

/**
 *	g1m_decode_version:
 *	Decode a version from a 'MM.mm.ffff' formatted version string.
 *
 *	@arg	raw		the string to decode from.
 *	@arg	version	the structure where to store the information.
 *	@return			the error code (if any).
 */

int g1m_decode_version(const char *raw, g1m_version_t *version)
{
	/* helper values */
	const int two = '0' + '0' * 10;

	/* get the basic version data */
	*version = (g1m_version_t){
		.g1m_version_major = raw[0] * 10 + raw[1] - two,
		.g1m_version_minor = raw[3] * 10 + raw[4] - two};

	/* get normal values */
	version->g1m_version_zone = raw[6] - '0';
	version->g1m_version_math = raw[7] - '0';

	/* get build flags */
	version->g1m_version_flags = 0;
	if (raw[8] != '0')
		version->g1m_version_flags |= g1m_versionflag_indev;
	if (raw[9] != '0')
		version->g1m_version_flags |= g1m_versionflag_spe;

	/* no error */
	return (0);
}

/**
 *	g1m_encode_version:
 *	Encode a version into an 'MM.mm.ffff' formatted version string.
 *
 *	@arg	version	the version to encode.
 *	@arg	the string to encode into.
 *	@return			the error code (if any).
 */

int g1m_encode_version(const g1m_version_t *version, char *raw)
{
	/* make buffer */
	char buf[11]; sprintf(buf, "%02u.%02u.%c%c%c%c",
		version->g1m_version_major,
		version->g1m_version_minor,
		version->g1m_version_zone + '0',
		version->g1m_version_math + '0',
		version->g1m_version_flags & g1m_versionflag_indev ? '1' : '0',
		version->g1m_version_flags & g1m_versionflag_spe   ? '1' : '0');

	/* copy final */
	memcpy(raw, buf, 10);
	return (0);
}