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utf8.c - iomenu - interactive terminal-based selection menu
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---
utf8.c (3174B)
---
1 #include "utf8.h"
2 #include <stddef.h>
3 #include <stdint.h>
4
5 /*
6 * Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to
10 * deal in the Software without restriction, including without limitation the
11 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
12 * sell copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * IN THE SOFTWARE.
25 */
26
27 size_t
28 utf8_encode(char *dest, uint32_t u)
29 {
30 size_t v, n, n2;
31
32 if (u <= 0x7f) {
33 if (dest != NULL)
34 *dest = u;
35 return 1;
36 }
37
38 for (v = 0x3f, n = 0; v >= u; ++n)
39 v = (v << 5) | 0x1f;
40 if (v >= 0x7fffffff)
41 return 0; /* cannot be encoded */
42
43 if (dest == NULL)
44 return 1 + n;
45
46 *dest++ = (0xff << (7 - n)) | (u >> n * 6);
47 for (n2 = n - 1; n2 ; --n2) {
48 *dest++ = 0x80 | (u & 0x3f);
49 u >>= 6;
50 }
51 return 1 + n;
52 }
53
54 /* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de> *
55 * See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. */
56
57 static const uint8_t utf8d[] = {
58 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 */
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, /* 20..3f */
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, /* 40..5f */
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, /* 60..7f */
62 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 */
63 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 */
64 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 */
65 0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, /* e0..ef */
66 0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, /* f0..ff */
67 0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, /* s0..s0 */
68 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 */
69 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 */
70 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 */
71 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 */
72 };
73
74 uint32_t
75 utf8_decode(uint32_t *state, uint32_t *codep, uint32_t byte)
76 {
77 uint32_t type = utf8d[byte];
78
79 *codep = (*state != UTF8_ACCEPT)
80 ? (byte & 0x3fu) | (*codep << 6)
81 : (0xff >> type) & (byte);
82 *state = utf8d[256 + *state*16 + type];
83 return *state;
84 }