1 /* Look at first character in UTF-8 string.
2 Copyright (C) 1999-2000, 2002, 2006-2007, 2009-2012 Free Software
4 Written by Bruno Haible <bruno@clisp.org>, 2002.
6 This program is free software: you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 u8_strmbtouc (ucs4_t *puc, const uint8_t *s)
27 /* Keep in sync with unistr.h and u8-mbtouc-aux.c. */
33 return (c != 0 ? 1 : 0);
39 #if CONFIG_UNICODE_SAFETY
40 if ((s[1] ^ 0x80) < 0x40)
45 *puc = ((unsigned int) (c & 0x1f) << 6)
46 | (unsigned int) (s[1] ^ 0x80);
52 #if CONFIG_UNICODE_SAFETY
53 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
54 && (c >= 0xe1 || s[1] >= 0xa0)
55 && (c != 0xed || s[1] < 0xa0))
57 if (s[1] != 0 && s[2] != 0)
60 *puc = ((unsigned int) (c & 0x0f) << 12)
61 | ((unsigned int) (s[1] ^ 0x80) << 6)
62 | (unsigned int) (s[2] ^ 0x80);
68 #if CONFIG_UNICODE_SAFETY
69 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
70 && (s[3] ^ 0x80) < 0x40
71 && (c >= 0xf1 || s[1] >= 0x90)
73 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
77 if (s[1] != 0 && s[2] != 0 && s[3] != 0)
80 *puc = ((unsigned int) (c & 0x07) << 18)
81 | ((unsigned int) (s[1] ^ 0x80) << 12)
82 | ((unsigned int) (s[2] ^ 0x80) << 6)
83 | (unsigned int) (s[3] ^ 0x80);
90 #if CONFIG_UNICODE_SAFETY
91 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
92 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
93 && (c >= 0xf9 || s[1] >= 0x88))
95 if (s[1] != 0 && s[2] != 0 && s[3] != 0 && s[4] != 0)
98 *puc = ((unsigned int) (c & 0x03) << 24)
99 | ((unsigned int) (s[1] ^ 0x80) << 18)
100 | ((unsigned int) (s[2] ^ 0x80) << 12)
101 | ((unsigned int) (s[3] ^ 0x80) << 6)
102 | (unsigned int) (s[4] ^ 0x80);
108 #if CONFIG_UNICODE_SAFETY
109 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
110 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
111 && (s[5] ^ 0x80) < 0x40
112 && (c >= 0xfd || s[1] >= 0x84))
114 if (s[1] != 0 && s[2] != 0 && s[3] != 0 && s[4] != 0 && s[5] != 0)
117 *puc = ((unsigned int) (c & 0x01) << 30)
118 | ((unsigned int) (s[1] ^ 0x80) << 24)
119 | ((unsigned int) (s[2] ^ 0x80) << 18)
120 | ((unsigned int) (s[3] ^ 0x80) << 12)
121 | ((unsigned int) (s[4] ^ 0x80) << 6)
122 | (unsigned int) (s[5] ^ 0x80);
128 /* invalid or incomplete multibyte character */