/* $FreeBSD: head/lib/libc/iconv/citrus_stdenc.c 263986 2014-04-01 10:36:11Z tijl $ */
/*      $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);
}