1 /* $OpenBSD: utf8-combined.c,v 1.4 2025/01/01 15:17:36 nicm Exp $ */
2
3 /*
4 * Copyright (c) 2023 Nicholas Marriott <nicholas.marriott@gmail.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <stdlib.h>
22 #include <string.h>
23 #include <wchar.h>
24
25 #include "tmux.h"
26
27 /* Has this got a zero width joiner at the end? */
28 int
utf8_has_zwj(const struct utf8_data * ud)29 utf8_has_zwj(const struct utf8_data *ud)
30 {
31 if (ud->size < 3)
32 return (0);
33 return (memcmp(ud->data + ud->size - 3, "\342\200\215", 3) == 0);
34 }
35
36 /* Is this a zero width joiner? */
37 int
utf8_is_zwj(const struct utf8_data * ud)38 utf8_is_zwj(const struct utf8_data *ud)
39 {
40 if (ud->size != 3)
41 return (0);
42 return (memcmp(ud->data, "\342\200\215", 3) == 0);
43 }
44
45 /* Is this a variation selector? */
46 int
utf8_is_vs(const struct utf8_data * ud)47 utf8_is_vs(const struct utf8_data *ud)
48 {
49 if (ud->size != 3)
50 return (0);
51 return (memcmp(ud->data, "\357\270\217", 3) == 0);
52 }
53
54 /* Is this in the modifier table? */
55 int
utf8_is_modifier(const struct utf8_data * ud)56 utf8_is_modifier(const struct utf8_data *ud)
57 {
58 wchar_t wc;
59
60 if (utf8_towc(ud, &wc) != UTF8_DONE)
61 return (0);
62 switch (wc) {
63 case 0x1F1E6:
64 case 0x1F1E7:
65 case 0x1F1E8:
66 case 0x1F1E9:
67 case 0x1F1EA:
68 case 0x1F1EB:
69 case 0x1F1EC:
70 case 0x1F1ED:
71 case 0x1F1EE:
72 case 0x1F1EF:
73 case 0x1F1F0:
74 case 0x1F1F1:
75 case 0x1F1F2:
76 case 0x1F1F3:
77 case 0x1F1F4:
78 case 0x1F1F5:
79 case 0x1F1F6:
80 case 0x1F1F7:
81 case 0x1F1F8:
82 case 0x1F1F9:
83 case 0x1F1FA:
84 case 0x1F1FB:
85 case 0x1F1FC:
86 case 0x1F1FD:
87 case 0x1F1FE:
88 case 0x1F1FF:
89 case 0x1F3FB:
90 case 0x1F3FC:
91 case 0x1F3FD:
92 case 0x1F3FE:
93 case 0x1F3FF:
94 return (1);
95 }
96 return (0);
97 }
98