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/* ****************************************************************************
 * iconv.c -- Main conversion function.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'all/iconv' module,
 * in libcarrot, an experimental modular libc project.
 *
 * This file 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 of the License, or (at your option)
 * any later version.
 *
 * This file 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 Lesser Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include "iconv.h"

/**
 *	iconv:
 *	Main conversion function.
 *
 *	@arg	cd			the conversion descriptor.
 *	@arg	inbuf		the input buffer pointer reference.
 *	@arg	inleft		the input buffer left bytes counter reference.
 *	@arg	outbuf		the output buffer pointer reference.
 *	@arg	outleft		the output buffer left bytes counter reference.
 *	@return				the number of characters converted in a nonreversible
 *	                    way during this call.
 */

size_t iconv(iconv_t cd, char **inbuf, size_t *inleft,
	char **outbuf, size_t *outleft)
{
	const struct iconv_route *r = (const void*)cd;
	struct __iconv_step step;
	size_t ret = 0; int err;

	/* Check the route. */
	if (!r || r->magic != I_MAGIC) {
		__set_errno(I_EBADF);
		return ((size_t)-1);
	}

	/* Prepare the step. */
	step.next = NULL;
	step.next_func = NULL;
	step.in = *inbuf;
	step.out = *outbuf;
	while (*inleft) {
		int in0, out0;
		int indiff, outdiff;

		/* Set the I/O. */
		in0  = (int)( *inleft > 0x7FFF ? 0x7FFF : *inleft);
		out0 = (int)(*outleft > 0x7FFF ? 0x7FFF : *outleft);
		step.in = *inbuf;
		step.inleft  = in0;
		step.out = *outbuf;
		step.outleft = out0;

		/* Decode the sequence. */
		err = (*r->func)(&step);
		if (err) {
			__set_errno(err);
			return ((size_t)-1);
		}

		/* Check the difference. */
		indiff  =  in0 - step.inleft;
		outdiff = out0 - step.outleft;
		if (indiff == outdiff && !memcmp(*inbuf, *outbuf, indiff))
			ret++;

		/* Update the positions. */
		*inbuf   += indiff;
		*inleft  -= indiff;
		*outbuf  += outdiff;
		*outleft -= outdiff;
	}

	/* Everything seem to have gone well. */
	return (ret);
}