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tutf8.c - iomenu - interactive terminal-based selection menu
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---
tutf8.c (3175B)
---
1 #include "utf8.h"
2
3 #include <stddef.h>
4 #include <stdint.h>
5
6 /*
7 * Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to
11 * deal in the Software without restriction, including without limitation the
12 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
13 * sell copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 * IN THE SOFTWARE.
26 */
27
28 size_t
29 utf8_encode(char *dest, uint32_t u)
30 {
31 size_t v, n, n2;
32
33 if (u <= 0x7f) {
34 if (dest != NULL)
35 *dest = u;
36 return 1;
37 }
38
39 for (v = 0x3f, n = 0; v >= u; ++n)
40 v = (v << 5) | 0x1f;
41 if (v >= 0x7fffffff)
42 return 0; /* cannot be encoded */
43
44 if (dest == NULL)
45 return 1 + n;
46
47 *dest++ = (0xff << (7 - n)) | (u >> n * 6);
48 for (n2 = n - 1; n2 ; --n2) {
49 *dest++ = 0x80 | (u & 0x3f);
50 u >>= 6;
51 }
52 return 1 + n;
53 }
54
55 /* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de> *
56 * See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. */
57
58 static const uint8_t utf8d[] = {
59 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 00..1f */
60 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 20..3f */
61 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 40..5f */
62 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 60..7f */
63 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, /* 80..9f */
64 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* a0..bf */
65 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* c0..df */
66 0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, /* e0..ef */
67 0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, /* f0..ff */
68 0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, /* s0..s0 */
69 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, /* s1..s2 */
70 1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, /* s3..s4 */
71 1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, /* s5..s6 */
72 1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* s7..s8 */
73 };
74
75 uint32_t
76 utf8_decode(uint32_t *state, uint32_t *codep, uint32_t byte)
77 {
78 uint32_t type = utf8d[byte];
79
80 *codep = (*state != UTF8_ACCEPT)
81 ? (byte & 0x3fu) | (*codep << 6)
82 : (0xff >> type) & (byte);
83 *state = utf8d[256 + *state*16 + type];
84 return *state;
85 }