Annotation of src/sys/fs/unicode.h, Revision 1.7
1.7 ! jakllsch 1: /* $NetBSD: unicode.h,v 1.6 2008/04/28 20:24:02 martin Exp $ */
1.1 jdolecek 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: *
16: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26: * POSSIBILITY OF SUCH DAMAGE.
27: */
28:
1.4 yamt 29: /*-
30: * Copyright (c) 1993
31: * The Regents of the University of California. All rights reserved.
32: *
33: * This code is derived from software contributed to Berkeley by
34: * Paul Borman at Krystal Technologies.
35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
44: * 3. All advertising materials mentioning features or use of this software
45: * must display the following acknowledgement:
46: * This product includes software developed by the University of
47: * California, Berkeley and its contributors.
48: * 4. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: */
64:
1.1 jdolecek 65: /*
66: * Routines for handling Unicode encoded in UTF-8 form, code derived from
67: * src/lib/libc/locale/utf2.c.
68: */
1.5 drochner 69: static u_int16_t wget_utf8(const char **, size_t *) __unused;
70: static int wput_utf8(char *, size_t, u_int16_t) __unused;
1.1 jdolecek 71:
72: /*
1.2 jdolecek 73: * Read one UTF8-encoded character off the string, shift the string pointer
1.1 jdolecek 74: * and return the character.
75: */
76: static u_int16_t
1.2 jdolecek 77: wget_utf8(const char **str, size_t *sz)
1.1 jdolecek 78: {
1.7 ! jakllsch 79: size_t c;
1.1 jdolecek 80: u_int16_t rune = 0;
81: const char *s = *str;
82: static const int _utf_count[16] = {
83: 1, 1, 1, 1, 1, 1, 1, 1,
84: 0, 0, 0, 0, 2, 2, 3, 0,
85: };
86:
1.2 jdolecek 87: /* must be called with at least one byte remaining */
88: KASSERT(*sz > 0);
1.1 jdolecek 89:
90: c = _utf_count[(s[0] & 0xf0) >> 4];
1.2 jdolecek 91: if (c == 0 || c > *sz) {
1.1 jdolecek 92: decoding_error:
93: /*
94: * The first character is in range 128-255 and doesn't
95: * mark valid a valid UTF-8 sequence. There is not much
96: * we can do with this, so handle by returning
97: * the first character as if it would be a correctly
98: * encoded ISO-8859-1 character.
99: */
100: c = 1;
101: }
102:
103: switch (c) {
104: case 1:
105: rune = s[0] & 0xff;
106: break;
107: case 2:
108: if ((s[1] & 0xc0) != 0x80)
109: goto decoding_error;
110: rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
111: break;
112: case 3:
113: if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
114: goto decoding_error;
1.5 drochner 115: rune = ((s[0] & 0x0F) << 12) | ((s[1] & 0x3F) << 6)
1.1 jdolecek 116: | (s[2] & 0x3F);
117: break;
118: }
119:
1.2 jdolecek 120: *str += c;
121: *sz -= c;
1.1 jdolecek 122: return rune;
123: }
124:
125: /*
126: * Encode wide character and write it to the string. 'n' specifies
127: * how much buffer space remains in 's'. Returns number of bytes written
128: * to the target string 's'.
129: */
130: static int
131: wput_utf8(char *s, size_t n, u_int16_t wc)
132: {
133: if (wc & 0xf800) {
134: if (n < 3) {
135: /* bound check failure */
136: return 0;
137: }
138:
1.5 drochner 139: s[0] = 0xE0 | (wc >> 12);
1.1 jdolecek 140: s[1] = 0x80 | ((wc >> 6) & 0x3F);
141: s[2] = 0x80 | ((wc) & 0x3F);
142: return 3;
143: } else if (wc & 0x0780) {
144: if (n < 2) {
145: /* bound check failure */
146: return 0;
147: }
148:
1.5 drochner 149: s[0] = 0xC0 | (wc >> 6);
1.1 jdolecek 150: s[1] = 0x80 | ((wc) & 0x3F);
151: return 2;
152: } else {
153: if (n < 1) {
154: /* bound check failure */
155: return 0;
156: }
157:
158: s[0] = wc;
159: return 1;
160: }
161: }
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