/*-
 * 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
 * All rights reserved.
 * 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.
 * 4. 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#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"

extern int __mb_sb_limit;

extern _RuneLocale	*_Read_RuneMagi(FILE *);

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

#define __collate_load_error (table->__collate_load_error)
#define __collate_substitute_nontrivial (table->__collate_substitute_nontrivial)
#define __collate_substitute_table_ptr (table->__collate_substitute_table_ptr)
#define __collate_char_pri_table_ptr (table->__collate_char_pri_table_ptr)
#define __collate_chain_pri_table (table->__collate_chain_pri_table)


static void destruct_ctype(void *v)
{
	struct xlocale_ctype *l = v;
	if (strcmp(l->runes->__encoding, "EUC") == 0)
		free(l->runes->__variable);
	if (&_DefaultRuneLocale != l->runes) 
		free(l->runes);
	free(l);
}
_RuneLocale *__getCurrentRuneLocale(void)
{
	return XLOCALE_CTYPE(__get_locale())->runes;
}

static int
__setrunelocale(struct xlocale_ctype *l, const char *encoding)
{
	FILE *fp;
	char name[PATH_MAX];
	_RuneLocale *rl;
	int saverr, ret;
	struct xlocale_ctype saved = *l;

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

	/* Range checking not needed, encoding length already checked before */
	(void) strcpy(name, _PathLocale);
	(void) strcat(name, "/");
	(void) strcat(name, encoding);
	(void) strcat(name, "/LC_CTYPE");

	if ((fp = fopen(name, "r")) == NULL)
		return (errno == 0 ? ENOENT : errno);

	if ((rl = _Read_RuneMagi(fp)) == NULL) {
		saverr = (errno == 0 ? EFTYPE : errno);
		(void)fclose(fp);
		return (saverr);
	}
	(void)fclose(fp);

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

	rl->__sputrune = NULL;
	rl->__sgetrune = NULL;
	if (strcmp(rl->__encoding, "NONE") == 0)
		ret = _none_init(l, rl);
	else if (strcmp(rl->__encoding, "ASCII") == 0)
		ret = _ascii_init(l, rl);
	else if (strcmp(rl->__encoding, "UTF-8") == 0)
		ret = _UTF8_init(l, rl);
	else if (strcmp(rl->__encoding, "EUC") == 0)
		ret = _EUC_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. */
		/* FIXME: The "EUC" check here is a hideous abstraction violation. */
		if ((saved.runes != &_DefaultRuneLocale) && (saved.runes)) {
			if (strcmp(saved.runes->__encoding, "EUC") == 0) {
				free(saved.runes->__variable);
			}
			free(saved.runes);
		}
	} 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;
	return (_LDP_LOADED);
}
void *__ctype_load(const char *locale, locale_t unused)
{
	struct xlocale_ctype *l = calloc(sizeof(struct xlocale_ctype), 1);
	l->header.header.destructor = destruct_ctype;
	if (__setrunelocale(l, locale))
	{
		free(l);
		return NULL;
	}
	return l;
}