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203 lines
5.2 KiB
C
203 lines
5.2 KiB
C
/*-
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* Copyright (c) 2002, 2003 Tim J. Robbins
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <runetype.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
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size_t, mbstate_t * __restrict);
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extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
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size_t _UTF8_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
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mbstate_t * __restrict);
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size_t _UTF8_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
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int
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_UTF8_init(_RuneLocale *rl)
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{
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__mbrtowc = _UTF8_mbrtowc;
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__wcrtomb = _UTF8_wcrtomb;
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_CurrentRuneLocale = rl;
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__mb_cur_max = 6;
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return (0);
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}
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size_t
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_UTF8_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
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mbstate_t * __restrict ps __unused)
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{
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int ch, i, len, mask;
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wchar_t lbound, wch;
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if (s == NULL)
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/* Reset to initial shift state (no-op) */
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return (0);
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if (n == 0)
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/* Incomplete multibyte sequence */
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return ((size_t)-2);
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/*
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* Determine the number of octets that make up this character from
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* the first octet, and a mask that extracts the interesting bits of
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* the first octet.
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*
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* We also specify a lower bound for the character code to detect
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* redundant, non-"shortest form" encodings. For example, the
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* sequence C0 80 is _not_ a legal representation of the null
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* character. This enforces a 1-to-1 mapping between character
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* codes and their multibyte representations.
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*/
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ch = (unsigned char)*s;
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if ((ch & 0x80) == 0) {
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mask = 0x7f;
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len = 1;
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lbound = 0;
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} else if ((ch & 0xe0) == 0xc0) {
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mask = 0x1f;
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len = 2;
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lbound = 0x80;
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} else if ((ch & 0xf0) == 0xe0) {
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mask = 0x0f;
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len = 3;
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lbound = 0x800;
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} else if ((ch & 0xf8) == 0xf0) {
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mask = 0x07;
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len = 4;
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lbound = 0x10000;
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} else if ((ch & 0xfc) == 0xf8) {
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mask = 0x03;
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len = 5;
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lbound = 0x200000;
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} else if ((ch & 0xfc) == 0xfc) {
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mask = 0x01;
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len = 6;
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lbound = 0x4000000;
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} else {
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/*
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* Malformed input; input is not UTF-8.
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*/
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errno = EILSEQ;
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return ((size_t)-1);
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}
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if (n < (size_t)len)
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/* Incomplete multibyte sequence */
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return ((size_t)-2);
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/*
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* Decode the octet sequence representing the character in chunks
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* of 6 bits, most significant first.
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*/
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wch = (unsigned char)*s++ & mask;
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i = len;
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while (--i != 0) {
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if ((*s & 0xc0) != 0x80) {
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/*
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* Malformed input; bad characters in the middle
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* of a character.
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*/
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errno = EILSEQ;
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return ((size_t)-1);
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}
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wch <<= 6;
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wch |= *s++ & 0x3f;
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}
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if (wch < lbound) {
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/*
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* Malformed input; redundant encoding.
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*/
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errno = EILSEQ;
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return ((size_t)-1);
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}
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if (pwc != NULL)
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*pwc = wch;
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return (wch == L'\0' ? 0 : len);
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}
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size_t
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_UTF8_wcrtomb(char * __restrict s, wchar_t wc,
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mbstate_t * __restrict ps __unused)
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{
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unsigned char lead;
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int i, len;
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if (s == NULL)
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/* Reset to initial shift state (no-op) */
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return (1);
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/*
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* Determine the number of octets needed to represent this character.
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* We always output the shortest sequence possible. Also specify the
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* first few bits of the first octet, which contains the information
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* about the sequence length.
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*/
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if ((wc & ~0x7f) == 0) {
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lead = 0;
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len = 1;
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} else if ((wc & ~0x7ff) == 0) {
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lead = 0xc0;
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len = 2;
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} else if ((wc & ~0xffff) == 0) {
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lead = 0xe0;
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len = 3;
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} else if ((wc & ~0x1fffff) == 0) {
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lead = 0xf0;
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len = 4;
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} else if ((wc & ~0x3ffffff) == 0) {
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lead = 0xf8;
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len = 5;
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} else if ((wc & ~0x7fffffff) == 0) {
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lead = 0xfc;
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len = 6;
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} else {
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errno = EILSEQ;
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return ((size_t)-1);
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}
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/*
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* Output the octets representing the character in chunks
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* of 6 bits, least significant last. The first octet is
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* a special case because it contains the sequence length
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* information.
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*/
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for (i = len - 1; i > 0; i--) {
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s[i] = (wc & 0x3f) | 0x80;
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wc >>= 6;
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}
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*s = (wc & 0xff) | lead;
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return (len);
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}
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