blob: 71d0db839c74357086c494c4a21b987454c16796 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* Look at first character in UTF-8 string.
Copyright (C) 1999-2002, 2006-2007, 2009-2023 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2001.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#if defined IN_LIBUNISTRING
/* Tell unistr.h to declare u8_mbtouc_unsafe as 'extern', not
'static inline'. */
# include "unistring-notinline.h"
#endif
/* Specification. */
#include "unistr.h"
#if !HAVE_INLINE
int
u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n)
{
uint8_t c = *s;
if (c < 0x80)
{
*puc = c;
return 1;
}
else if (c >= 0xc2)
{
if (c < 0xe0)
{
if (n >= 2)
{
if ((s[1] ^ 0x80) < 0x40)
{
*puc = ((unsigned int) (c & 0x1f) << 6)
| (unsigned int) (s[1] ^ 0x80);
return 2;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return 1;
}
}
else if (c < 0xf0)
{
if (n >= 3)
{
if ((s[1] ^ 0x80) < 0x40)
{
if ((s[2] ^ 0x80) < 0x40)
{
if ((c >= 0xe1 || s[1] >= 0xa0)
&& (c != 0xed || s[1] < 0xa0))
{
*puc = ((unsigned int) (c & 0x0f) << 12)
| ((unsigned int) (s[1] ^ 0x80) << 6)
| (unsigned int) (s[2] ^ 0x80);
return 3;
}
/* invalid multibyte character */
*puc = 0xfffd;
return 3;
}
/* invalid multibyte character */
*puc = 0xfffd;
return 2;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
if (n == 1 || (s[1] ^ 0x80) >= 0x40)
return 1;
else
return 2;
}
}
else if (c < 0xf8)
{
if (n >= 4)
{
if ((s[1] ^ 0x80) < 0x40)
{
if ((s[2] ^ 0x80) < 0x40)
{
if ((s[3] ^ 0x80) < 0x40)
{
if ((c >= 0xf1 || s[1] >= 0x90)
&& (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
)
{
*puc = ((unsigned int) (c & 0x07) << 18)
| ((unsigned int) (s[1] ^ 0x80) << 12)
| ((unsigned int) (s[2] ^ 0x80) << 6)
| (unsigned int) (s[3] ^ 0x80);
return 4;
}
/* invalid multibyte character */
*puc = 0xfffd;
return 4;
}
/* invalid multibyte character */
*puc = 0xfffd;
return 3;
}
/* invalid multibyte character */
*puc = 0xfffd;
return 2;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
if (n == 1 || (s[1] ^ 0x80) >= 0x40)
return 1;
else if (n == 2 || (s[2] ^ 0x80) >= 0x40)
return 2;
else
return 3;
}
}
}
/* invalid multibyte character */
*puc = 0xfffd;
return 1;
}
#endif
|
