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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2025 Keith Packard
*
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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 <inttypes.h>
#include <wchar.h>
#ifdef __MB_EXTENDED_CHARSETS_JIS
#define define_jis_x0208
#define define_jis_x0213
#include "jis.h"
wint_t
__euc_jp_to_unicode(uint32_t euc_jp)
{
uint8_t byte0 = euc_jp >> 16;
uint8_t byte1 = euc_jp >> 8;
uint8_t byte2 = euc_jp;
const uint16_t *codes;
const struct jis_charmap *map;
uint8_t first_row, last_row;
uint16_t unicode;
switch (byte0) {
case 0x8f:
codes = __euc_jp_jis_x0213_codes;
map = __euc_jp_jis_x0213_map;
first_row = __euc_jp_jis_x0213_first_row;
last_row = __euc_jp_jis_x0213_last_row;
break;
case 0x00:
switch (byte1) {
case 0x00:
/* ASCII */
if (byte2 < 0xa0 && byte2 != 0x8f && byte2 != 0x8e)
return byte2;
return WEOF;
case 0x8e:
/* Half-width Katakana */
if (0xa1 <= byte2 && byte2 <= 0xdf)
return (uint16_t)byte2 - 0xa1U + 0xff61U;
return WEOF;
default:
codes = __euc_jp_jis_x0208_codes;
map = __euc_jp_jis_x0208_map;
first_row = __euc_jp_jis_x0208_first_row;
last_row = __euc_jp_jis_x0208_last_row;
break;
}
break;
default:
return WEOF;
}
if (byte1 < first_row || last_row < byte1)
return WEOF;
map = &map[byte1 - first_row];
if (map->offset == 0xffff || byte2 < map->first || map->last < byte2)
return WEOF;
codes = &codes[map->offset];
unicode = codes[byte2 - map->first];
if (unicode == __euc_jp_invalid_unicode)
return WEOF;
return unicode;
}
#endif /* __MB_EXTENDED_CHARSETS_JIS */
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