/*      $NetBSD: citrus_mapper_serial.c,v 1.2 2003/07/12 15:39:20 tshiozak Exp $        */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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 <sys/queue.h>

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

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_hash.h"
#include "citrus_mapper.h"
#include "citrus_mapper_serial.h"

/* ---------------------------------------------------------------------- */

_CITRUS_MAPPER_DECLS(mapper_serial);
_CITRUS_MAPPER_DEF_OPS(mapper_serial);

#define _citrus_mapper_parallel_mapper_init             \
        _citrus_mapper_serial_mapper_init
#define _citrus_mapper_parallel_mapper_uninit           \
        _citrus_mapper_serial_mapper_uninit
#define _citrus_mapper_parallel_mapper_init_state       \
        _citrus_mapper_serial_mapper_init_state
static int      _citrus_mapper_parallel_mapper_convert(
                    struct _citrus_mapper * __restrict, _index_t * __restrict,
                    _index_t, void * __restrict);
_CITRUS_MAPPER_DEF_OPS(mapper_parallel);
#undef _citrus_mapper_parallel_mapper_init
#undef _citrus_mapper_parallel_mapper_uninit
#undef _citrus_mapper_parallel_mapper_init_state


/* ---------------------------------------------------------------------- */

struct maplink {
        STAILQ_ENTRY(maplink)    ml_entry;
        struct _mapper          *ml_mapper;
};
STAILQ_HEAD(maplist, maplink);

struct _citrus_mapper_serial {
        struct maplist           sr_mappers;
};

int
_citrus_mapper_serial_mapper_getops(struct _citrus_mapper_ops *ops)
{

        memcpy(ops, &_citrus_mapper_serial_mapper_ops,
            sizeof(_citrus_mapper_serial_mapper_ops));

        return (0);
}

int
_citrus_mapper_parallel_mapper_getops(struct _citrus_mapper_ops *ops)
{

        memcpy(ops, &_citrus_mapper_parallel_mapper_ops,
            sizeof(_citrus_mapper_parallel_mapper_ops));

        return (0);
}

static void
uninit(struct _citrus_mapper_serial *sr)
{
        struct maplink *ml;

        while ((ml = STAILQ_FIRST(&sr->sr_mappers)) != NULL) {
                STAILQ_REMOVE_HEAD(&sr->sr_mappers, ml_entry);
                _mapper_close(ml->ml_mapper);
                free(ml);
        }
}

static int
parse_var(struct _citrus_mapper_area *__restrict ma,
    struct _citrus_mapper_serial *sr, struct _memstream *ms)
{
        struct _region r;
        struct maplink *ml;
        char mapname[PATH_MAX];
        int ret;

        STAILQ_INIT(&sr->sr_mappers);
        while (1) {
                /* remove beginning white spaces */
                _memstream_skip_ws(ms);
                if (_memstream_iseof(ms))
                        break;
                /* cut down a mapper name */
                _memstream_chr(ms, &r, ',');
                snprintf(mapname, sizeof(mapname), "%.*s",
                    (int)_region_size(&r), (char *)_region_head(&r));
                /* remove trailing white spaces */
                mapname[_bcs_skip_nonws(mapname)-mapname] = '\0';
                /* create a new mapper record */
                ml = malloc(sizeof(*ml));
                if (ml == NULL)
                        return (errno);
                ret = _mapper_open(ma, &ml->ml_mapper, mapname);
                if (ret) {
                        free(ml);
                        return (ret);
                }
                /* support only 1:1 and stateless converter */
                if (_mapper_get_src_max(ml->ml_mapper) != 1 ||
                    _mapper_get_dst_max(ml->ml_mapper) != 1 ||
                    _mapper_get_state_size(ml->ml_mapper) != 0) {
                        free(ml);
                        return (EINVAL);
                }
                STAILQ_INSERT_TAIL(&sr->sr_mappers, ml, ml_entry);
        }
        return (0);
}

static int
/*ARGSUSED*/
_citrus_mapper_serial_mapper_init(struct _citrus_mapper_area *__restrict ma __unused,
    struct _citrus_mapper * __restrict cm, const char * __restrict dir __unused,
    const void * __restrict var, size_t lenvar,
    struct _citrus_mapper_traits * __restrict mt, size_t lenmt)
{
        struct _citrus_mapper_serial *sr;
        struct _memstream ms;
        struct _region r;

        if (lenmt < sizeof(*mt))
                return (EINVAL);

        sr = malloc(sizeof(*sr));
        if (sr == NULL)
                return (errno);

        _region_init(&r, __DECONST(void *, var), lenvar);
        _memstream_bind(&ms, &r);
        if (parse_var(ma, sr, &ms)) {
                uninit(sr);
                free(sr);
                return (EINVAL);
        }
        cm->cm_closure = sr;
        mt->mt_src_max = mt->mt_dst_max = 1;    /* 1:1 converter */
        mt->mt_state_size = 0;                  /* stateless */

        return (0);
}

static void
/*ARGSUSED*/
_citrus_mapper_serial_mapper_uninit(struct _citrus_mapper *cm)
{

        if (cm && cm->cm_closure) {
                uninit(cm->cm_closure);
                free(cm->cm_closure);
        }
}

static int
/*ARGSUSED*/
_citrus_mapper_serial_mapper_convert(struct _citrus_mapper * __restrict cm,
    _index_t * __restrict dst, _index_t src, void * __restrict ps __unused)
{
        struct _citrus_mapper_serial *sr;
        struct maplink *ml;
        int ret;

        sr = cm->cm_closure;
        STAILQ_FOREACH(ml, &sr->sr_mappers, ml_entry) {
                ret = _mapper_convert(ml->ml_mapper, &src, src, NULL);
                if (ret != _MAPPER_CONVERT_SUCCESS)
                        return (ret);
        }
        *dst = src;
        return (_MAPPER_CONVERT_SUCCESS);
}

static int
/*ARGSUSED*/
_citrus_mapper_parallel_mapper_convert(struct _citrus_mapper * __restrict cm,
    _index_t * __restrict dst, _index_t src, void * __restrict ps __unused)
{
        struct _citrus_mapper_serial *sr;
        struct maplink *ml;
        _index_t tmp;
        int ret;

        sr = cm->cm_closure;
        STAILQ_FOREACH(ml, &sr->sr_mappers, ml_entry) {
                ret = _mapper_convert(ml->ml_mapper, &tmp, src, NULL);
                if (ret == _MAPPER_CONVERT_SUCCESS) {
                        *dst = tmp;
                        return (_MAPPER_CONVERT_SUCCESS);
                } else if (ret == _MAPPER_CONVERT_ILSEQ)
                        return (_MAPPER_CONVERT_ILSEQ);
        }
        return (_MAPPER_CONVERT_NONIDENTICAL);
}

static void
/*ARGSUSED*/
_citrus_mapper_serial_mapper_init_state(void)
{

}