279 lines
6.2 KiB
C
279 lines
6.2 KiB
C
/* $NetBSD: utf2.c,v 1.5 2001/01/03 15:23:26 lukem Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Paul Borman at Krystal Technologies.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)utf2.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: utf2.c,v 1.5 2001/01/03 15:23:26 lukem Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <assert.h>
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#include <errno.h>
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#include "rune.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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int _UTF2_init __P((_RuneLocale *));
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size_t _UTF2_mbrtowc __P((struct _RuneLocale *, rune_t *, const char *, size_t,
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void *));
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size_t _UTF2_wcrtomb __P((struct _RuneLocale *, char *, size_t, const rune_t,
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void *));
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void _UTF2_initstate __P((_RuneLocale *, void *));
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void _UTF2_packstate __P((_RuneLocale *, mbstate_t *, void *));
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void _UTF2_unpackstate __P((_RuneLocale *, void *, const mbstate_t *));
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static 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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typedef struct {
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void *runelocale; /* reserved for future thread-safeness */
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char ch[3];
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int chlen;
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} _UTF2State;
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static _RuneState _UTF2_RuneState = {
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sizeof(_UTF2State), /* sizestate */
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_UTF2_initstate, /* initstate */
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_UTF2_packstate, /* packstate */
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_UTF2_unpackstate /* unpackstate */
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};
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int
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_UTF2_init(rl)
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_RuneLocale *rl;
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{
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_DIAGASSERT(rl != NULL);
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/* sanity check to avoid overruns */
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if (sizeof(_UTF2State) > sizeof(mbstate_t))
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return (EINVAL);
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rl->__rune_mbrtowc = _UTF2_mbrtowc;
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rl->__rune_wcrtomb = _UTF2_wcrtomb;
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rl->__rune_RuneState = &_UTF2_RuneState;
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rl->__rune_mb_cur_max = 3;
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return (0);
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}
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/* s is non-null */
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size_t
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_UTF2_mbrtowc(rl, pwcs, s, n, state)
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_RuneLocale *rl;
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rune_t *pwcs;
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const char *s;
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size_t n;
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void *state;
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{
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_UTF2State *ps;
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rune_t rune;
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int c;
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/* rl appears to be unused */
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/* pwcs may be NULL */
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_DIAGASSERT(s != NULL);
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_DIAGASSERT(state != NULL);
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ps = state;
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/* make sure we have the first byte in the buffer */
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switch (ps->chlen) {
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case 0:
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if (n < 1)
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return (size_t)-2;
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ps->ch[0] = *s++;
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ps->chlen = 1;
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n--;
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break;
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case 1:
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case 2:
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break;
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default:
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/* illegal state */
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goto encoding_error;
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}
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c = _utf_count[(ps->ch[0] >> 4) & 0xf];
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if (c == 0)
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goto encoding_error;
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while (ps->chlen < c) {
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if (n < 1)
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return (size_t)-2;
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ps->ch[ps->chlen] = *s++;
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ps->chlen++;
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n--;
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}
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switch (c) {
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case 1:
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rune = ps->ch[0] & 0xff;
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break;
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case 2:
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if ((ps->ch[1] & 0xc0) != 0x80)
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goto encoding_error;
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rune = ((ps->ch[0] & 0x1F) << 6) | (ps->ch[1] & 0x3F);
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break;
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case 3:
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if ((ps->ch[1] & 0xC0) != 0x80 || (ps->ch[2] & 0xC0) != 0x80)
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goto encoding_error;
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rune = ((ps->ch[0] & 0x1F) << 12) | ((ps->ch[1] & 0x3F) << 6)
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| (ps->ch[2] & 0x3F);
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break;
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}
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ps->chlen = 0;
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if (pwcs)
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*pwcs = rune;
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if (!rune)
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return 0;
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else
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return c;
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encoding_error:
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ps->chlen = 0;
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return (size_t)-1;
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}
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/* s is non-null */
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size_t
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_UTF2_wcrtomb(rl, s, n, wc, state)
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_RuneLocale *rl;
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char *s;
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size_t n;
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const rune_t wc;
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void *state;
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{
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/* rl appears to be unused */
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_DIAGASSERT(s != NULL);
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/* state appears to be unused */
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/* check invalid sequence */
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if (wc & ~0xffff) {
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errno = EILSEQ;
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return (size_t)-1;
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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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errno = EILSEQ; /*XXX*/
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return (size_t)-1;
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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 {
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if (wc & 0x0780) {
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if (n < 2) {
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/* bound check failure */
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errno = EILSEQ; /*XXX*/
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return (size_t)-1;
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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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errno = EILSEQ; /*XXX*/
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return (size_t)-1;
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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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}
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void
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_UTF2_initstate(rl, s)
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_RuneLocale *rl;
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void *s;
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{
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_UTF2State *state;
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/* rl appears to be unused */
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if (!s)
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return;
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state = s;
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memset(state, 0, sizeof(_UTF2State));
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}
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void
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_UTF2_packstate(rl, dst, src)
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_RuneLocale *rl;
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mbstate_t *dst;
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void* src;
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{
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/* rl appears to be unused */
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(src != NULL);
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memcpy((caddr_t)dst, (caddr_t)src, sizeof(_UTF2State));
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return;
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}
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void
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_UTF2_unpackstate(rl, dst, src)
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_RuneLocale *rl;
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void* dst;
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const mbstate_t *src;
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{
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/* rl appears to be unused */
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(src != NULL);
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memcpy((caddr_t)dst, (caddr_t)src, sizeof(_UTF2State));
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return;
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}
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