131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* $NetBSD: unicode.h,v 1.3 2005/12/11 12:24:25 christos Exp $ */
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/*-
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* Copyright (c) 2001, 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Routines for handling Unicode encoded in UTF-8 form, code derived from
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* src/lib/libc/locale/utf2.c.
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*/
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/*
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* Read one UTF8-encoded character off the string, shift the string pointer
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* and return the character.
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*/
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static u_int16_t
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wget_utf8(const char **str, size_t *sz)
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{
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int c;
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u_int16_t rune = 0;
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const char *s = *str;
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static const int _utf_count[16] = {
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1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 2, 2, 3, 0,
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};
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/* must be called with at least one byte remaining */
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KASSERT(*sz > 0);
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c = _utf_count[(s[0] & 0xf0) >> 4];
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if (c == 0 || c > *sz) {
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decoding_error:
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/*
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* The first character is in range 128-255 and doesn't
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* mark valid a valid UTF-8 sequence. There is not much
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* we can do with this, so handle by returning
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* the first character as if it would be a correctly
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* encoded ISO-8859-1 character.
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*/
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c = 1;
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}
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switch (c) {
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case 1:
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rune = s[0] & 0xff;
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break;
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case 2:
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if ((s[1] & 0xc0) != 0x80)
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goto decoding_error;
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rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
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break;
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case 3:
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if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
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goto decoding_error;
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rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6)
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| (s[2] & 0x3F);
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break;
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}
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*str += c;
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*sz -= c;
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return rune;
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}
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/*
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* Encode wide character and write it to the string. 'n' specifies
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* how much buffer space remains in 's'. Returns number of bytes written
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* to the target string 's'.
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*/
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static int
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wput_utf8(char *s, size_t n, u_int16_t wc)
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{
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if (wc & 0xf800) {
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if (n < 3) {
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/* bound check failure */
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return 0;
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}
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s[0] = 0xE0 | ((wc >> 12) & 0x0F);
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s[1] = 0x80 | ((wc >> 6) & 0x3F);
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s[2] = 0x80 | ((wc) & 0x3F);
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return 3;
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} else if (wc & 0x0780) {
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if (n < 2) {
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/* bound check failure */
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return 0;
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}
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s[0] = 0xC0 | ((wc >> 6) & 0x1F);
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s[1] = 0x80 | ((wc) & 0x3F);
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return 2;
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} else {
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if (n < 1) {
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/* bound check failure */
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return 0;
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}
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s[0] = wc;
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return 1;
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}
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}
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