FreeBSD/Linux Kernel Cross Reference
sys/fs/unicode.h
1 /* $NetBSD: unicode.h,v 1.4 2006/05/20 08:28:27 yamt Exp $ */
2
3 /*-
4 * Copyright (c) 2001, 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the NetBSD
18 * Foundation, Inc. and its contributors.
19 * 4. Neither the name of The NetBSD Foundation nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 /*-
37 * Copyright (c) 1993
38 * The Regents of the University of California. All rights reserved.
39 *
40 * This code is derived from software contributed to Berkeley by
41 * Paul Borman at Krystal Technologies.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 */
71
72 /*
73 * Routines for handling Unicode encoded in UTF-8 form, code derived from
74 * src/lib/libc/locale/utf2.c.
75 */
76
77 /*
78 * Read one UTF8-encoded character off the string, shift the string pointer
79 * and return the character.
80 */
81 static u_int16_t
82 wget_utf8(const char **str, size_t *sz)
83 {
84 int c;
85 u_int16_t rune = 0;
86 const char *s = *str;
87 static const int _utf_count[16] = {
88 1, 1, 1, 1, 1, 1, 1, 1,
89 0, 0, 0, 0, 2, 2, 3, 0,
90 };
91
92 /* must be called with at least one byte remaining */
93 KASSERT(*sz > 0);
94
95 c = _utf_count[(s[0] & 0xf0) >> 4];
96 if (c == 0 || c > *sz) {
97 decoding_error:
98 /*
99 * The first character is in range 128-255 and doesn't
100 * mark valid a valid UTF-8 sequence. There is not much
101 * we can do with this, so handle by returning
102 * the first character as if it would be a correctly
103 * encoded ISO-8859-1 character.
104 */
105 c = 1;
106 }
107
108 switch (c) {
109 case 1:
110 rune = s[0] & 0xff;
111 break;
112 case 2:
113 if ((s[1] & 0xc0) != 0x80)
114 goto decoding_error;
115 rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
116 break;
117 case 3:
118 if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
119 goto decoding_error;
120 rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6)
121 | (s[2] & 0x3F);
122 break;
123 }
124
125 *str += c;
126 *sz -= c;
127 return rune;
128 }
129
130 /*
131 * Encode wide character and write it to the string. 'n' specifies
132 * how much buffer space remains in 's'. Returns number of bytes written
133 * to the target string 's'.
134 */
135 static int
136 wput_utf8(char *s, size_t n, u_int16_t wc)
137 {
138 if (wc & 0xf800) {
139 if (n < 3) {
140 /* bound check failure */
141 return 0;
142 }
143
144 s[0] = 0xE0 | ((wc >> 12) & 0x0F);
145 s[1] = 0x80 | ((wc >> 6) & 0x3F);
146 s[2] = 0x80 | ((wc) & 0x3F);
147 return 3;
148 } else if (wc & 0x0780) {
149 if (n < 2) {
150 /* bound check failure */
151 return 0;
152 }
153
154 s[0] = 0xC0 | ((wc >> 6) & 0x1F);
155 s[1] = 0x80 | ((wc) & 0x3F);
156 return 2;
157 } else {
158 if (n < 1) {
159 /* bound check failure */
160 return 0;
161 }
162
163 s[0] = wc;
164 return 1;
165 }
166 }
Cache object: f6e5923c0086fbc4d04640a10d87fd07
|