/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Paul Borman at Krystal Technologies.
 *
 * Copyright (c) 2011 The FreeBSD Foundation
 *
 * Portions of this software were developed by David Chisnall
 * under sponsorship from the FreeBSD Foundation.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#define __RUNETYPE_INTERNAL 1

#include <runetype.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>
#include "ldpart.h"
#include "mblocal.h"
#include "setlocale.h"

#undef _CurrentRuneLocale
extern _RuneLocale const *_CurrentRuneLocale;
/*
 * A cached version of the runes for this thread.  Used by ctype.h
 */
_Thread_local const _RuneLocale *_ThreadRuneLocale;

extern int __mb_sb_limit;

extern _RuneLocale      *_Read_RuneMagi(const char *);

static int              __setrunelocale(struct xlocale_ctype *l, const char *);

static void
destruct_ctype(void *v)
{
        struct xlocale_ctype *l = v;

        if (&_DefaultRuneLocale != l->runes)
                free(l->runes);
        free(l);
}

const _RuneLocale *
__getCurrentRuneLocale(void)
{

        return (XLOCALE_CTYPE(__get_locale())->runes);
}

static void
free_runes(_RuneLocale *rl)
{
        if ((rl != &_DefaultRuneLocale) && (rl)) {
                free(rl);
        }
}

static int
__setrunelocale(struct xlocale_ctype *l, const char *encoding)
{
        _RuneLocale *rl;
        int ret;
        char *path;
        struct xlocale_ctype saved = *l;

        /*
         * The "C" and "POSIX" locale are always here.
         */
        if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
                free_runes(saved.runes);
                (void) _none_init(l, (_RuneLocale*)&_DefaultRuneLocale);
                return (0);
        }

        /* Range checking not needed, encoding length already checked before */
        if (asprintf(&path, "%s/%s/LC_CTYPE", _PathLocale, encoding) == -1)
                return (errno);

        if ((rl = _Read_RuneMagi(path)) == NULL) {
                free(path);
                errno = EINVAL;
                return (errno);
        }
        free(path);

        l->__mbrtowc = NULL;
        l->__mbsinit = NULL;
        l->__mbsnrtowcs = NULL;
        l->__wcrtomb = NULL;
        l->__wcsnrtombs = NULL;

        rl->__sputrune = NULL;
        rl->__sgetrune = NULL;
        if (strcmp(rl->__encoding, "NONE:US-ASCII") == 0)
                ret = _ascii_init(l, rl);
        else if (strncmp(rl->__encoding, "NONE", 4) == 0)
                ret = _none_init(l, rl);
        else if (strcmp(rl->__encoding, "UTF-8") == 0)
                ret = _UTF8_init(l, rl);
        else if (strcmp(rl->__encoding, "EUC-CN") == 0)
                ret = _EUC_CN_init(l, rl);
        else if (strcmp(rl->__encoding, "EUC-JP") == 0)
                ret = _EUC_JP_init(l, rl);
        else if (strcmp(rl->__encoding, "EUC-KR") == 0)
                ret = _EUC_KR_init(l, rl);
        else if (strcmp(rl->__encoding, "EUC-TW") == 0)
                ret = _EUC_TW_init(l, rl);
        else if (strcmp(rl->__encoding, "GB18030") == 0)
                ret = _GB18030_init(l, rl);
        else if (strcmp(rl->__encoding, "GB2312") == 0)
                ret = _GB2312_init(l, rl);
        else if (strcmp(rl->__encoding, "GBK") == 0)
                ret = _GBK_init(l, rl);
        else if (strcmp(rl->__encoding, "BIG5") == 0)
                ret = _BIG5_init(l, rl);
        else if (strcmp(rl->__encoding, "MSKanji") == 0)
                ret = _MSKanji_init(l, rl);
        else
                ret = EFTYPE;

        if (ret == 0) {
                /* Free the old runes if it exists. */
                free_runes(saved.runes);
                /* Reset the mbstates */
                memset(&l->c16rtomb, 0, sizeof(l->c16rtomb));
                memset(&l->c32rtomb, 0, sizeof(l->c32rtomb));
                memset(&l->mblen, 0, sizeof(l->mblen));
                memset(&l->mbrlen, 0, sizeof(l->mbrlen));
                memset(&l->mbrtoc16, 0, sizeof(l->mbrtoc16));
                memset(&l->mbrtoc32, 0, sizeof(l->mbrtoc32));
                memset(&l->mbrtowc, 0, sizeof(l->mbrtowc));
                memset(&l->mbsnrtowcs, 0, sizeof(l->mbsnrtowcs));
                memset(&l->mbsrtowcs, 0, sizeof(l->mbsrtowcs));
                memset(&l->mbtowc, 0, sizeof(l->mbtowc));
                memset(&l->wcrtomb, 0, sizeof(l->wcrtomb));
                memset(&l->wcsnrtombs, 0, sizeof(l->wcsnrtombs));
                memset(&l->wcsrtombs, 0, sizeof(l->wcsrtombs));
                memset(&l->wctomb, 0, sizeof(l->wctomb));
        } else {
                /* Restore the saved version if this failed. */
                memcpy(l, &saved, sizeof(struct xlocale_ctype));
                free(rl);
        }

        return (ret);
}

int
__wrap_setrunelocale(const char *locale)
{
        int ret = __setrunelocale(&__xlocale_global_ctype, locale);

        if (ret != 0) {
                errno = ret;
                return (_LDP_ERROR);
        }
        __mb_cur_max = __xlocale_global_ctype.__mb_cur_max;
        __mb_sb_limit = __xlocale_global_ctype.__mb_sb_limit;
        _CurrentRuneLocale = __xlocale_global_ctype.runes;
        return (_LDP_LOADED);
}

void
__set_thread_rune_locale(locale_t loc)
{

        if (loc == NULL) {
                _ThreadRuneLocale = &_DefaultRuneLocale;
        } else if (loc == LC_GLOBAL_LOCALE) {
                _ThreadRuneLocale = 0;
        } else {
                _ThreadRuneLocale = XLOCALE_CTYPE(loc)->runes;
        }
}

void *
__ctype_load(const char *locale, locale_t unused __unused)
{
        struct xlocale_ctype *l = calloc(sizeof(struct xlocale_ctype), 1);
        if (l == NULL)
                return (NULL);

        l->header.header.destructor = destruct_ctype;
        if (__setrunelocale(l, locale)) {
                free(l);
                return (NULL);
        }
        return (l);
}