1 /* $NetBSD: unicode.h,v 1.7 2014/04/06 19:25:22 jakllsch 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 * 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 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 65 /* 66 * Routines for handling Unicode encoded in UTF-8 form, code derived from 67 * src/lib/libc/locale/utf2.c. 68 */ 69 static u_int16_t wget_utf8(const char **, size_t *) __unused; 70 static int wput_utf8(char *, size_t, u_int16_t) __unused; 71 72 /* 73 * Read one UTF8-encoded character off the string, shift the string pointer 74 * and return the character. 75 */ 76 static u_int16_t 77 wget_utf8(const char **str, size_t *sz) 78 { 79 size_t c; 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 87 /* must be called with at least one byte remaining */ 88 KASSERT(*sz > 0); 89 90 c = _utf_count[(s[0] & 0xf0) >> 4]; 91 if (c == 0 || c > *sz) { 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; 115 rune = ((s[0] & 0x0F) << 12) | ((s[1] & 0x3F) << 6) 116 | (s[2] & 0x3F); 117 break; 118 } 119 120 *str += c; 121 *sz -= c; 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 } 138 139 s[0] = 0xE0 | (wc >> 12); 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 } 148 149 s[0] = 0xC0 | (wc >> 6); 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 } 162
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