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tmux/utf8-combined.c
nicm a42e425d44 Two fixes for RI codepoints. Firstly, do not combine more than two of 
them - previously we were ending up with four codepoints in one cell
which tmux believed to be width 2, but terminals considered width 4.
Secondly, invalidate cursor position before redrawing the cell when the
second codepoint is received, terminals vary in how they manage
backspace and cursor movement across these characters, so it is better
to use absolute rather than relative positioning. GitHub issue 4853.
2026-06-09 11:49:36 +00:00

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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 zero width joiner U+200D? */
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 variation selector U+FE0F? */
int
utf8_is_vs(const struct utf8_data *ud)
{
if (ud->size != 3)
return (0);
return (memcmp(ud->data, "\357\270\217", 3) == 0);
}
/* Is this Hangul filler U+3164? */
int
utf8_is_hangul_filler(const struct utf8_data *ud)
{
if (ud->size != 3)
return (0);
return (memcmp(ud->data, "\343\205\244", 3) == 0);
}
/* Count regional indicator characters. */
static u_int
utf8_regional_count(const struct utf8_data *ud)
{
u_int count = 0, i;
for (i = 0; i + 4 <= ud->size; i++) {
if (ud->data[i] == 0xf0 &&
ud->data[i + 1] == 0x9f &&
ud->data[i + 2] == 0x87 &&
ud->data[i + 3] >= 0xa6 &&
ud->data[i + 3] <= 0xbf)
count++;
}
return (count);
}
/* 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)) {
if (utf8_regional_count(with) != 1)
return (0);
if (utf8_regional_count(add) != 1)
return (0);
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 0x1F483:
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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