1 /* Look at first character in UTF-8 string.
2 Copyright (C) 1999-2002, 2006-2007, 2009-2019 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2001.
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
20 #if defined IN_LIBUNISTRING
21 /* Tell unistr.h to declare u8_mbtouc as 'extern', not 'static inline'. */
22 # include "unistring-notinline.h"
31 u8_mbtouc (ucs4_t
*puc
, const uint8_t *s
, size_t n
)
46 if ((s
[1] ^ 0x80) < 0x40)
48 *puc
= ((unsigned int) (c
& 0x1f) << 6)
49 | (unsigned int) (s
[1] ^ 0x80);
52 /* invalid multibyte character */
56 /* incomplete multibyte character */
65 if ((s
[1] ^ 0x80) < 0x40)
67 if ((s
[2] ^ 0x80) < 0x40)
69 if ((c
>= 0xe1 || s
[1] >= 0xa0)
70 && (c
!= 0xed || s
[1] < 0xa0))
72 *puc
= ((unsigned int) (c
& 0x0f) << 12)
73 | ((unsigned int) (s
[1] ^ 0x80) << 6)
74 | (unsigned int) (s
[2] ^ 0x80);
77 /* invalid multibyte character */
81 /* invalid multibyte character */
85 /* invalid multibyte character */
89 /* incomplete multibyte character */
91 if (n
== 1 || (s
[1] ^ 0x80) >= 0x40)
101 if ((s
[1] ^ 0x80) < 0x40)
103 if ((s
[2] ^ 0x80) < 0x40)
105 if ((s
[3] ^ 0x80) < 0x40)
107 if ((c
>= 0xf1 || s
[1] >= 0x90)
108 && (c
< 0xf4 || (c
== 0xf4 && s
[1] < 0x90)))
110 *puc
= ((unsigned int) (c
& 0x07) << 18)
111 | ((unsigned int) (s
[1] ^ 0x80) << 12)
112 | ((unsigned int) (s
[2] ^ 0x80) << 6)
113 | (unsigned int) (s
[3] ^ 0x80);
116 /* invalid multibyte character */
120 /* invalid multibyte character */
124 /* invalid multibyte character */
128 /* invalid multibyte character */
132 /* incomplete multibyte character */
134 if (n
== 1 || (s
[1] ^ 0x80) >= 0x40)
136 else if (n
== 2 || (s
[2] ^ 0x80) >= 0x40)
143 /* invalid multibyte character */