/*      $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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_stdenc.c,v 1.4 2011/11/19 18:39:58 tnozaki Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.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_stdenc.h"
#include "citrus_none.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 */
};

#ifdef _I18N_DYNAMIC

static int
/*ARGSUSED*/
get_state_desc_default(struct _citrus_stdenc * __restrict ce,
                      void * __restrict ps,
                      int id,
                      struct _citrus_stdenc_state_desc * __restrict d)
{
       return EOPNOTSUPP;
}

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

       _DIAGASSERT(encname != NULL);
       _DIAGASSERT(!lenvar || variable!=NULL);
       _DIAGASSERT(rce != NULL);

       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),
                       _CITRUS_STDENC_ABI_VERSION);
       if (ret)
               goto bad;

       /* If return ABI version is not expected, should fixup it */
       if (ce->ce_ops->eo_abi_version < 0x00000002) {
               ce->ce_ops->eo_get_state_desc = &get_state_desc_default;
       }

       /* 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)
{

       _DIAGASSERT(ce != NULL);

       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);
}

#else
/* !_I18N_DYNAMIC */

int
/*ARGSUSED*/
_citrus_stdenc_open(struct _citrus_stdenc * __restrict * __restrict rce,
                   char const * __restrict encname,
                   const void * __restrict variable, size_t lenvar)
{
       if (!strcmp(encname, _CITRUS_DEFAULT_STDENC_NAME)) {
               *rce = &_citrus_stdenc_default;
               return (0);
       }
       return (EINVAL);
}

void
/*ARGSUSED*/
_citrus_stdenc_close(struct _citrus_stdenc *ce)
{
}

#endif

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