301 lines
6.5 KiB
C
301 lines
6.5 KiB
C
/* $NetBSD: big5.c,v 1.8 2001/06/21 02:20:24 yamt 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[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: big5.c,v 1.8 2001/06/21 02:20:24 yamt 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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#include <string.h>
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#include <sys/types.h>
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#include "rune_local.h"
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#ifdef lint
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#define inline
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#endif
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const char *_BIG5_magic __P((void));
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int _BIG5_init __P((_RuneLocale *));
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static inline int _big5_check __P((u_int));
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static inline int _big5_check2 __P((u_int));
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size_t _BIG5_mbrtowc __P((struct _RuneLocale *, rune_t *, const char *,
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size_t, void *));
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size_t _BIG5_wcrtomb __P((struct _RuneLocale *, char *, size_t, const rune_t,
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void *));
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void _BIG5_initstate __P((_RuneLocale *, void *));
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void _BIG5_packstate __P((_RuneLocale *, mbstate_t *, void *));
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void _BIG5_unpackstate __P((_RuneLocale *, void *, const mbstate_t *));
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typedef struct {
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void *runelocale; /* reserved for future thread-safeness */
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char ch[2];
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int chlen;
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} _BIG5State;
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static _RuneState _BIG5_RuneState = {
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sizeof(_BIG5State), /* sizestate */
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_BIG5_initstate, /* initstate */
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_BIG5_packstate, /* packstate */
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_BIG5_unpackstate /* unpackstate */
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};
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const char *
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_BIG5_magic()
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{
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return _RUNE_MODULE_1("LC_CTYPE");
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}
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int
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_BIG5_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(_BIG5State) > sizeof(mbstate_t))
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return (EINVAL);
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rl->__rune_mbrtowc = _BIG5_mbrtowc;
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rl->__rune_wcrtomb = _BIG5_wcrtomb;
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rl->__rune_RuneState = &_BIG5_RuneState;
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rl->__rune_mb_cur_max = 2;
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return (0);
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}
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static inline int
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_big5_check(c)
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u_int c;
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{
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c &= 0xff;
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return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
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}
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static inline int
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_big5_check2(c)
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u_int c;
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{
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c &= 0xff;
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if ((c >= 0x40 && c <= 0x7f) || (c >= 0xa1 && c <= 0xfe))
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return 1;
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else
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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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_BIG5_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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_BIG5State *ps;
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rune_t rune;
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int c;
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int chlenbak;
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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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chlenbak = ps->chlen;
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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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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 = _big5_check(ps->ch[0] & 0xff);
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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 (!_big5_check2(ps->ch[1] & 0xff))
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goto encoding_error;
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rune = ((ps->ch[0] & 0xff) << 8) | (ps->ch[1] & 0xff);
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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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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 - chlenbak;
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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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_BIG5_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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int l;
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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 & 0x8000) {
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if (_big5_check((wc >> 8) & 0xff) != 2 ||
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!_big5_check2(wc & 0xff)) {
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errno = EILSEQ;
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return (size_t)-1;
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}
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l = 2;
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} else {
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if (wc & ~0xff || !_big5_check(wc & 0xff)) {
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errno = EILSEQ;
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return (size_t)-1;
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}
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l = 1;
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}
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if (n < l) {
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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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if (l == 2) {
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s[0] = (wc >> 8) & 0xff;
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s[1] = wc & 0xff;
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} else
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s[0] = wc & 0xff;
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return (l);
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}
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void
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_BIG5_initstate(rl, s)
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_RuneLocale *rl;
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void *s;
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{
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_BIG5State *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(_BIG5State));
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}
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void
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_BIG5_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(_BIG5State));
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return;
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}
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void
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_BIG5_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(_BIG5State));
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return;
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}
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