/* $FreeBSD$ */
/*	$NetBSD: citrus_stdenc.c,v 1.4 2011/11/19 18:39:58 tnozaki Exp $	*/

/*-
 * Copyright (c)2003 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_none.h"
#include "citrus_stdenc.h"

struct _citrus_stdenc _citrus_stdenc_default = {
	&_citrus_NONE_stdenc_ops,	/* ce_ops */
	NULL,				/* ce_closure */
	NULL,				/* ce_module */
	&_citrus_NONE_stdenc_traits,	/* ce_traits */
};

int
_citrus_stdenc_open(struct _citrus_stdenc * __restrict * __restrict rce,
    char const * __restrict encname, const void * __restrict variable,
    size_t lenvar)
{
	struct _citrus_stdenc *ce;
	_citrus_module_t handle;
	_citrus_stdenc_getops_t getops;
	int ret;

	if (!strcmp(encname, _CITRUS_DEFAULT_STDENC_NAME)) {
		*rce = &_citrus_stdenc_default;
		return (0);
	}
	ce = malloc(sizeof(*ce));
	if (ce == NULL) {
		ret = errno;
		goto bad;
	}
	ce->ce_ops = NULL;
	ce->ce_closure = NULL;
	ce->ce_module = NULL;
	ce->ce_traits = NULL;

	ret = _citrus_load_module(&handle, encname);
	if (ret)
		goto bad;

	ce->ce_module = handle;

	getops = (_citrus_stdenc_getops_t)_citrus_find_getops(ce->ce_module,
	    encname, "stdenc");
	if (getops == NULL) {
		ret = EINVAL;
		goto bad;
	}

	ce->ce_ops = (struct _citrus_stdenc_ops *)malloc(sizeof(*ce->ce_ops));
	if (ce->ce_ops == NULL) {
		ret = errno;
		goto bad;
	}

	ret = (*getops)(ce->ce_ops, sizeof(*ce->ce_ops));
	if (ret)
		goto bad;

	/* validation check */
	if (ce->ce_ops->eo_init == NULL ||
	    ce->ce_ops->eo_uninit == NULL ||
	    ce->ce_ops->eo_init_state == NULL ||
	    ce->ce_ops->eo_mbtocs == NULL ||
	    ce->ce_ops->eo_cstomb == NULL ||
	    ce->ce_ops->eo_mbtowc == NULL ||
	    ce->ce_ops->eo_wctomb == NULL ||
	    ce->ce_ops->eo_get_state_desc == NULL) {
		ret = EINVAL;
		goto bad;
	}

	/* allocate traits */
	ce->ce_traits = malloc(sizeof(*ce->ce_traits));
	if (ce->ce_traits == NULL) {
		ret = errno;
		goto bad;
	}
	/* init and get closure */
	ret = (*ce->ce_ops->eo_init)(ce, variable, lenvar, ce->ce_traits);
	if (ret)
		goto bad;

	*rce = ce;

	return (0);

bad:
	_citrus_stdenc_close(ce);
	return (ret);
}

void
_citrus_stdenc_close(struct _citrus_stdenc *ce)
{

	if (ce == &_citrus_stdenc_default)
		return;

	if (ce->ce_module) {
		if (ce->ce_ops) {
			if (ce->ce_closure && ce->ce_ops->eo_uninit)
				(*ce->ce_ops->eo_uninit)(ce);
			free(ce->ce_ops);
		}
		free(ce->ce_traits);
		_citrus_unload_module(ce->ce_module);
	}
	free(ce);
}