utf8-combined.c

   1 /* $OpenBSD$ */
   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 static const wchar_t utf8_modifier_table[] = {
  28         0x1F1E6,
  29         0x1F1E7,
  30         0x1F1E8,
  31         0x1F1E9,
  32         0x1F1EA,
  33         0x1F1EB,
  34         0x1F1EC,
  35         0x1F1ED,
  36         0x1F1EE,
  37         0x1F1EF,
  38         0x1F1F0,
  39         0x1F1F1,
  40         0x1F1F2,
  41         0x1F1F3,
  42         0x1F1F4,
  43         0x1F1F5,
  44         0x1F1F6,
  45         0x1F1F7,
  46         0x1F1F8,
  47         0x1F1F9,
  48         0x1F1FA,
  49         0x1F1FB,
  50         0x1F1FC,
  51         0x1F1FD,
  52         0x1F1FE,
  53         0x1F1FF,
  54         0x1F3FB,
  55         0x1F3FC,
  56         0x1F3FD,
  57         0x1F3FE,
  58         0x1F3FF
  59 };
  60
  61 /* Has this got a zero width joiner at the end? */
  62 int
  63 utf8_has_zwj(const struct utf8_data *ud)
  64 {
  65         if (ud->size < 3)
  66                 return (0);
  67         return (memcmp(ud->data + ud->size - 3, "\342\200\215", 3) == 0);
  68 }
  69
  70 /* Is this a zero width joiner? */
  71 int
  72 utf8_is_zwj(const struct utf8_data *ud)
  73 {
  74         if (ud->size != 3)
  75                 return (0);
  76         return (memcmp(ud->data, "\342\200\215", 3) == 0);
  77 }
  78
  79 /* Is this a variation selector? */
  80 int
  81 utf8_is_vs(const struct utf8_data *ud)
  82 {
  83         if (ud->size != 3)
  84                 return (0);
  85         return (memcmp(ud->data, "\357\270\217", 3) == 0);
  86 }
  87
  88 /* Is this in the modifier table? */
  89 int
  90 utf8_is_modifier(const struct utf8_data *ud)
  91 {
  92         wchar_t wc;
  93
  94         if (utf8_towc(ud, &wc) != UTF8_DONE)
  95                 return (0);
  96         if (!utf8_in_table(wc, utf8_modifier_table,
  97             nitems(utf8_modifier_table)))
  98                 return (0);
  99         return (1);
 100 }