1 5e11c00c 2021-03-02 op /* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
3 5e11c00c 2021-03-02 op * Permission is hereby granted, free of charge, to any person
4 5e11c00c 2021-03-02 op * obtaining a copy of this software and associated documentation
5 5e11c00c 2021-03-02 op * files (the "Software"), to deal in the Software without
6 5e11c00c 2021-03-02 op * restriction, including without limitation the rights to use, copy,
7 5e11c00c 2021-03-02 op * modify, merge, publish, distribute, sublicense, and/or sell copies
8 5e11c00c 2021-03-02 op * of the Software, and to permit persons to whom the Software is
9 5e11c00c 2021-03-02 op * furnished to do so, subject to the following conditions:
11 5e11c00c 2021-03-02 op * The above copyright notice and this permission notice shall be
12 5e11c00c 2021-03-02 op * included in all copies or substantial portions of the Software.
14 5e11c00c 2021-03-02 op * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 5e11c00c 2021-03-02 op * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 5e11c00c 2021-03-02 op * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 5e11c00c 2021-03-02 op * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
18 5e11c00c 2021-03-02 op * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
19 5e11c00c 2021-03-02 op * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 5e11c00c 2021-03-02 op * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 174b3cdf 2021-03-21 op #include <assert.h>
25 5e11c00c 2021-03-02 op #include <stddef.h>
26 5e11c00c 2021-03-02 op #include <stdint.h>
27 174b3cdf 2021-03-21 op #include <wchar.h>
29 5caf7d67 2021-07-12 op #include "telescope.h"
30 5caf7d67 2021-07-12 op #include "utf8.h"
32 5e11c00c 2021-03-02 op #define UTF8_ACCEPT 0
33 5e11c00c 2021-03-02 op #define UTF8_REJECT 1
35 5e11c00c 2021-03-02 op static const uint8_t utf8d[] = {
36 5e11c00c 2021-03-02 op 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
37 5e11c00c 2021-03-02 op 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
38 5e11c00c 2021-03-02 op 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
39 5e11c00c 2021-03-02 op 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
40 5e11c00c 2021-03-02 op 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
41 5e11c00c 2021-03-02 op 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
42 5e11c00c 2021-03-02 op 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
43 5e11c00c 2021-03-02 op 0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
44 5e11c00c 2021-03-02 op 0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
45 5e11c00c 2021-03-02 op 0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
46 5e11c00c 2021-03-02 op 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
47 5e11c00c 2021-03-02 op 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
48 5e11c00c 2021-03-02 op 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
49 5e11c00c 2021-03-02 op 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
53 174b3cdf 2021-03-21 op utf8_decode(uint32_t* restrict state, uint32_t* restrict codep, uint8_t byte) {
54 5e11c00c 2021-03-02 op uint32_t type = utf8d[byte];
56 5e11c00c 2021-03-02 op *codep = (*state != UTF8_ACCEPT) ?
57 5e11c00c 2021-03-02 op (byte & 0x3fu) | (*codep << 6) :
58 5e11c00c 2021-03-02 op (0xff >> type) & (byte);
60 5e11c00c 2021-03-02 op *state = utf8d[256 + *state*16 + type];
61 5e11c00c 2021-03-02 op return *state;
65 174b3cdf 2021-03-21 op /* end of the converter, utility functions ahead */
67 8947c1f2 2021-03-21 op /* encode cp in s. s must be at least 4 bytes wide */
69 8947c1f2 2021-03-21 op utf8_encode(uint32_t cp, char *s)
71 8947c1f2 2021-03-21 op if (cp <= 0x7F) {
72 8947c1f2 2021-03-21 op *s = (uint8_t)cp;
74 8947c1f2 2021-03-21 op } else if (cp <= 0x7FF) {
75 8947c1f2 2021-03-21 op s[1] = (uint8_t)(( cp & 0x3F ) + 0x80);
76 8947c1f2 2021-03-21 op s[0] = (uint8_t)(((cp >> 6) & 0x1F) + 0xC0);
78 8947c1f2 2021-03-21 op } else if (cp <= 0xFFFF) {
79 8947c1f2 2021-03-21 op s[2] = (uint8_t)(( cp & 0x3F) + 0x80);
80 8947c1f2 2021-03-21 op s[1] = (uint8_t)(((cp >> 6) & 0x3F) + 0x80);
81 8947c1f2 2021-03-21 op s[0] = (uint8_t)(((cp >> 12) & 0x0F) + 0xE0);
83 8947c1f2 2021-03-21 op } else if (cp <= 0x10FFFF) {
84 8947c1f2 2021-03-21 op s[3] = (uint8_t)(( cp & 0x3F) + 0x80);
85 8947c1f2 2021-03-21 op s[2] = (uint8_t)(((cp >> 6) & 0x3F) + 0x80);
86 8947c1f2 2021-03-21 op s[1] = (uint8_t)(((cp >> 12) & 0x3F) + 0x80);
87 8947c1f2 2021-03-21 op s[0] = (uint8_t)(((cp >> 18) & 0x07) + 0xF0);
96 5e11c00c 2021-03-02 op utf8_nth(char *s, size_t n)
99 5e11c00c 2021-03-02 op uint32_t cp = 0, state = 0;
101 5e11c00c 2021-03-02 op for (i = 0; *s && i < n; ++s)
102 5e11c00c 2021-03-02 op if (!utf8_decode(&state, &cp, *s))
105 5e11c00c 2021-03-02 op if (state != UTF8_ACCEPT)
113 174b3cdf 2021-03-21 op utf8_cplen(char *s)
115 174b3cdf 2021-03-21 op uint32_t cp = 0, state = 0;
119 174b3cdf 2021-03-21 op for (; *s; ++s)
120 174b3cdf 2021-03-21 op if (!utf8_decode(&state, &cp, *s))
125 421bca4a 2021-06-12 op /* returns only 0, 1, 2 or 8. assumes sizeof(wchar_t) is 4 */
127 174b3cdf 2021-03-21 op utf8_chwidth(uint32_t cp)
129 174b3cdf 2021-03-21 op /* XXX: if we're running on a platform where sizeof(wchar_t)
130 174b3cdf 2021-03-21 op * == 2 what to do? The manpage for wcwidth and wcs isn't
131 174b3cdf 2021-03-21 op * clear about the encoding, but if it's 16 bit wide I assume
132 174b3cdf 2021-03-21 op * it must use UTF-16... right? */
133 174b3cdf 2021-03-21 op assert(sizeof(wchar_t) == 4);
136 421bca4a 2021-06-12 op * quick and dirty fix for the tabs. In the future we may
137 421bca4a 2021-06-12 op * want to expand tabs into N spaces, but for the time being
138 421bca4a 2021-06-12 op * this seems to be good enough (tm).
140 421bca4a 2021-06-12 op if (cp == '\t')
143 174b3cdf 2021-03-21 op return wcwidth((wchar_t)cp);
146 174b3cdf 2021-03-21 op /* NOTE: n is the number of codepoints, NOT the byte length. In
147 174b3cdf 2021-03-21 op * other words, s MUST be NUL-terminated. */
149 174b3cdf 2021-03-21 op utf8_snwidth(const char *s, size_t n)
151 174b3cdf 2021-03-21 op size_t i, tot;
152 174b3cdf 2021-03-21 op uint32_t cp = 0, state = 0;
155 174b3cdf 2021-03-21 op for (i = 0; *s && i < n; ++s)
156 174b3cdf 2021-03-21 op if (!utf8_decode(&state, &cp, *s)) {
158 174b3cdf 2021-03-21 op tot += utf8_chwidth(cp);
165 174b3cdf 2021-03-21 op utf8_swidth(const char *s)
168 174b3cdf 2021-03-21 op uint32_t cp = 0, state = 0;
171 174b3cdf 2021-03-21 op for (; *s; ++s)
172 174b3cdf 2021-03-21 op if (!utf8_decode(&state, &cp, *s))
173 174b3cdf 2021-03-21 op tot += utf8_chwidth(cp);
179 17e5106b 2021-03-21 op utf8_swidth_between(const char *str, const char *end)
182 17e5106b 2021-03-21 op uint32_t cp = 0, state = 0;
185 17e5106b 2021-03-21 op for (; *str && str < end; ++str)
186 17e5106b 2021-03-21 op if (!utf8_decode(&state, &cp, *str))
187 17e5106b 2021-03-21 op tot += utf8_chwidth(cp);
192 2ba66cea 2021-03-22 op utf8_next_cp(const char *s)
194 17e5106b 2021-03-21 op uint32_t cp = 0, state = 0;
196 17e5106b 2021-03-21 op for (; *s; ++s)
197 17e5106b 2021-03-21 op if (!utf8_decode(&state, &cp, *s))
199 2ba66cea 2021-03-22 op return (char*)s+1;
203 2ba66cea 2021-03-22 op utf8_prev_cp(const char *start, const char *base)
207 17e5106b 2021-03-21 op for (; start > base; start--) {
209 17e5106b 2021-03-21 op if ((c & 0xC0) != 0x80)
210 2ba66cea 2021-03-22 op return (char*)start;
213 2ba66cea 2021-03-22 op return (char*)base;
