1 /* $NetBSD: unicode.h,v 1.2 2023/05/10 12:23:42 rillig 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 unsigned int 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 assert(*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 mark a 95 * valid UTF-8 sequence. There is not much we can do with 96 * this, so handle by returning the first byte as if it were a 97 * correctly encoded ISO-8859-1 character. 98 */ 99 c = 1; 100 } 101 102 switch (c) { 103 case 1: 104 rune = s[0] & 0xff; 105 break; 106 case 2: 107 if ((s[1] & 0xc0) != 0x80) 108 goto decoding_error; 109 rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F); 110 break; 111 case 3: 112 if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80) 113 goto decoding_error; 114 rune = ((s[0] & 0x0F) << 12) | ((s[1] & 0x3F) << 6) 115 | (s[2] & 0x3F); 116 break; 117 } 118 119 *str += c; 120 *sz -= c; 121 return rune; 122 } 123 124 /* 125 * Encode wide character and write it to the string. 'n' specifies 126 * how much buffer space remains in 's'. Returns number of bytes written 127 * to the target string 's'. 128 */ 129 static int 130 wput_utf8(char *s, size_t n, u_int16_t wc) 131 { 132 if (wc & 0xf800) { 133 if (n < 3) { 134 /* bound check failure */ 135 return 0; 136 } 137 138 s[0] = 0xE0 | (wc >> 12); 139 s[1] = 0x80 | ((wc >> 6) & 0x3F); 140 s[2] = 0x80 | ((wc) & 0x3F); 141 return 3; 142 } else if (wc & 0x0780) { 143 if (n < 2) { 144 /* bound check failure */ 145 return 0; 146 } 147 148 s[0] = 0xC0 | (wc >> 6); 149 s[1] = 0x80 | ((wc) & 0x3F); 150 return 2; 151 } else { 152 if (n < 1) { 153 /* bound check failure */ 154 return 0; 155 } 156 157 s[0] = wc; 158 return 1; 159 } 160 } 161
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