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tmux/utf8-combined.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2023 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "tmux.h"
enum hanguljamo_subclass {
HANGULJAMO_SUBCLASS_NOT_HANGULJAMO,
HANGULJAMO_SUBCLASS_CHOSEONG, // U+1100 - U+1112
HANGULJAMO_SUBCLASS_OLD_CHOSEONG, // U+1113 - U+115E
HANGULJAMO_SUBCLASS_CHOSEONG_FILLER, // U+115F
HANGULJAMO_SUBCLASS_JUNGSEONG_FILLER, // U+1160
HANGULJAMO_SUBCLASS_JUNGSEONG, // U+1161 - U+1175
HANGULJAMO_SUBCLASS_OLD_JUNGSEONG, // U+1176 - U+11A7
HANGULJAMO_SUBCLASS_JONGSEONG, // U+11A8 - U+11C2
HANGULJAMO_SUBCLASS_OLD_JONGSEONG, // U+11C3 - U+11FF
HANGULJAMO_SUBCLASS_EXTENDED_OLD_CHOSEONG, // U+A960 - U+A97C
HANGULJAMO_SUBCLASS_EXTENDED_OLD_JUNGSEONG, // U+D7B0 - U+D7C6
HANGULJAMO_SUBCLASS_EXTENDED_OLD_JONGSEONG // U+D7CB - U+D7FB
};
enum hanguljamo_class {
HANGULJAMO_CLASS_NOT_HANGULJAMO,
HANGULJAMO_CLASS_CHOSEONG,
HANGULJAMO_CLASS_JUNGSEONG,
HANGULJAMO_CLASS_JONGSEONG
};
/* Has this got a zero width joiner at the end? */
int
utf8_has_zwj(const struct utf8_data *ud)
{
if (ud->size < 3)
return (0);
return (memcmp(ud->data + ud->size - 3, "\342\200\215", 3) == 0);
}
/* Is this a zero width joiner? */
int
utf8_is_zwj(const struct utf8_data *ud)
{
if (ud->size != 3)
return (0);
return (memcmp(ud->data, "\342\200\215", 3) == 0);
}
/* Is this a variation selector? */
int
utf8_is_vs(const struct utf8_data *ud)
{
if (ud->size != 3)
return (0);
return (memcmp(ud->data, "\357\270\217", 3) == 0);
}
/* Should these two characters combine? */
int
utf8_should_combine(const struct utf8_data *with, const struct utf8_data *add)
{
wchar_t w, a;
if (utf8_towc(with, &w) != UTF8_DONE)
return (0);
if (utf8_towc(add, &a) != UTF8_DONE)
return (0);
/* Regional indicators. */
if ((a >= 0x1F1E6 && a <= 0x1F1FF) && (w >= 0x1F1E6 && w <= 0x1F1FF))
return (1);
/* Emoji skin tone modifiers. */
switch (a) {
case 0x1F44B:
case 0x1F44C:
case 0x1F44D:
case 0x1F44E:
case 0x1F44F:
case 0x1F450:
case 0x1F466:
case 0x1F467:
case 0x1F468:
case 0x1F469:
case 0x1F46E:
case 0x1F470:
case 0x1F471:
case 0x1F472:
case 0x1F473:
case 0x1F474:
case 0x1F475:
case 0x1F476:
case 0x1F477:
case 0x1F478:
case 0x1F47C:
case 0x1F481:
case 0x1F482:
case 0x1F485:
case 0x1F486:
case 0x1F487:
case 0x1F4AA:
case 0x1F575:
case 0x1F57A:
case 0x1F590:
case 0x1F595:
case 0x1F596:
case 0x1F645:
case 0x1F646:
case 0x1F647:
case 0x1F64B:
case 0x1F64C:
case 0x1F64D:
case 0x1F64E:
case 0x1F64F:
case 0x1F6B4:
case 0x1F6B5:
case 0x1F6B6:
case 0x1F926:
case 0x1F937:
case 0x1F938:
case 0x1F939:
case 0x1F93D:
case 0x1F93E:
case 0x1F9B5:
case 0x1F9B6:
case 0x1F9B8:
case 0x1F9B9:
case 0x1F9CD:
case 0x1F9CE:
case 0x1F9CF:
case 0x1F9D1:
case 0x1F9D2:
case 0x1F9D3:
case 0x1F9D4:
case 0x1F9D5:
case 0x1F9D6:
case 0x1F9D7:
case 0x1F9D8:
case 0x1F9D9:
case 0x1F9DA:
case 0x1F9DB:
case 0x1F9DC:
case 0x1F9DD:
case 0x1F9DE:
case 0x1F9DF:
if (w >= 0x1F3FB && w <= 0x1F3FF)
return (1);
break;
}
return 0;
}
static enum hanguljamo_subclass
hanguljamo_get_subclass(const u_char *s)
{
switch (s[0]) {
case 0xE1:
switch (s[1]) {
case 0x84:
if (s[2] >= 0x80 && s[2] <= 0x92)
return (HANGULJAMO_SUBCLASS_CHOSEONG);
if (s[2] >= 0x93 && s[2] <= 0xBF)
return (HANGULJAMO_SUBCLASS_OLD_CHOSEONG);
break;
case 0x85:
if (s[2] == 0x9F)
return (HANGULJAMO_SUBCLASS_CHOSEONG_FILLER);
if (s[2] == 0xA0)
return (HANGULJAMO_SUBCLASS_JUNGSEONG_FILLER);
if (s[2] >= 0x80 && s[2] <= 0x9E)
return (HANGULJAMO_SUBCLASS_OLD_CHOSEONG);
if (s[2] >= 0xA1 && s[2] <= 0xB5)
return (HANGULJAMO_SUBCLASS_JUNGSEONG);
if (s[2] >= 0xB6 && s[2] <= 0xBF)
return (HANGULJAMO_SUBCLASS_OLD_JUNGSEONG);
break;
case 0x86:
if (s[2] >= 0x80 && s[2] <= 0xA7)
return (HANGULJAMO_SUBCLASS_OLD_JUNGSEONG);
if (s[2] >= 0xA8 && s[2] <= 0xBF)
return (HANGULJAMO_SUBCLASS_JONGSEONG);
break;
case 0x87:
if (s[2] >= 0x80 && s[2] <= 0x82)
return (HANGULJAMO_SUBCLASS_JONGSEONG);
if (s[2] >= 0x83 && s[2] <= 0xBF)
return (HANGULJAMO_SUBCLASS_OLD_JONGSEONG);
break;
}
break;
case 0xEA:
if (s[1] == 0xA5 && s[2] >= 0xA0 && s[2] <= 0xBC)
return (HANGULJAMO_SUBCLASS_EXTENDED_OLD_CHOSEONG);
break;
case 0xED:
if (s[1] == 0x9E && s[2] >= 0xB0 && s[2] <= 0xBF)
return (HANGULJAMO_SUBCLASS_EXTENDED_OLD_JUNGSEONG);
if (s[1] != 0x9F)
break;
if (s[2] >= 0x80 && s[2] <= 0x86)
return (HANGULJAMO_SUBCLASS_EXTENDED_OLD_JUNGSEONG);
if (s[2] >= 0x8B && s[2] <= 0xBB)
return (HANGULJAMO_SUBCLASS_EXTENDED_OLD_JONGSEONG);
break;
}
return (HANGULJAMO_SUBCLASS_NOT_HANGULJAMO);
}
static enum hanguljamo_class
hanguljamo_get_class(const u_char *s)
{
switch (hanguljamo_get_subclass(s)) {
case HANGULJAMO_SUBCLASS_CHOSEONG:
case HANGULJAMO_SUBCLASS_CHOSEONG_FILLER:
case HANGULJAMO_SUBCLASS_OLD_CHOSEONG:
case HANGULJAMO_SUBCLASS_EXTENDED_OLD_CHOSEONG:
return (HANGULJAMO_CLASS_CHOSEONG);
case HANGULJAMO_SUBCLASS_JUNGSEONG:
case HANGULJAMO_SUBCLASS_JUNGSEONG_FILLER:
case HANGULJAMO_SUBCLASS_OLD_JUNGSEONG:
case HANGULJAMO_SUBCLASS_EXTENDED_OLD_JUNGSEONG:
return (HANGULJAMO_CLASS_JUNGSEONG);
case HANGULJAMO_SUBCLASS_JONGSEONG:
case HANGULJAMO_SUBCLASS_OLD_JONGSEONG:
case HANGULJAMO_SUBCLASS_EXTENDED_OLD_JONGSEONG:
return (HANGULJAMO_CLASS_JONGSEONG);
case HANGULJAMO_SUBCLASS_NOT_HANGULJAMO:
return (HANGULJAMO_CLASS_NOT_HANGULJAMO);
}
return (HANGULJAMO_CLASS_NOT_HANGULJAMO);
}
enum hanguljamo_state
hanguljamo_check_state(const struct utf8_data *p_ud, const struct utf8_data *ud)
{
const u_char *s;
if (ud->size != 3)
return (HANGULJAMO_STATE_NOT_HANGULJAMO);
switch (hanguljamo_get_class(ud->data)) {
case HANGULJAMO_CLASS_CHOSEONG:
return (HANGULJAMO_STATE_CHOSEONG);
case HANGULJAMO_CLASS_JUNGSEONG:
if (p_ud->size < 3)
return (HANGULJAMO_STATE_NOT_COMPOSABLE);
s = p_ud->data + p_ud->size - 3;
if (hanguljamo_get_class(s) == HANGULJAMO_CLASS_CHOSEONG)
return (HANGULJAMO_STATE_COMPOSABLE);
return (HANGULJAMO_STATE_NOT_COMPOSABLE);
case HANGULJAMO_CLASS_JONGSEONG:
if (p_ud->size < 3)
return (HANGULJAMO_STATE_NOT_COMPOSABLE);
s = p_ud->data + p_ud->size - 3;
if (hanguljamo_get_class(s) == HANGULJAMO_CLASS_JUNGSEONG)
return (HANGULJAMO_STATE_COMPOSABLE);
return (HANGULJAMO_STATE_NOT_COMPOSABLE);
case HANGULJAMO_CLASS_NOT_HANGULJAMO:
return (HANGULJAMO_STATE_NOT_HANGULJAMO);
}
return (HANGULJAMO_STATE_NOT_HANGULJAMO);
}
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