436 lines
10 KiB
C
436 lines
10 KiB
C
/* $NetBSD: citrus_euc.c,v 1.11 2006/03/19 01:25:44 christos Exp $ */
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/*-
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* Copyright (c)2002 Citrus Project,
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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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/*-
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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. 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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__RCSID("$NetBSD: citrus_euc.c,v 1.11 2006/03/19 01:25:44 christos Exp $");
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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 <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <locale.h>
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#include <wchar.h>
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#include <sys/types.h>
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#include <limits.h>
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#include "citrus_namespace.h"
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#include "citrus_types.h"
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#include "citrus_module.h"
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#include "citrus_ctype.h"
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#include "citrus_stdenc.h"
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#include "citrus_euc.h"
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/* ----------------------------------------------------------------------
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* private stuffs used by templates
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*/
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typedef struct {
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char ch[3];
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int chlen;
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} _EUCState;
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typedef struct {
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unsigned count[4];
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wchar_t bits[4];
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wchar_t mask;
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unsigned mb_cur_max;
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} _EUCEncodingInfo;
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typedef struct {
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_EUCEncodingInfo ei;
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struct {
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/* for future multi-locale facility */
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_EUCState s_mblen;
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_EUCState s_mbrlen;
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_EUCState s_mbrtowc;
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_EUCState s_mbtowc;
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_EUCState s_mbsrtowcs;
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_EUCState s_wcrtomb;
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_EUCState s_wcsrtombs;
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_EUCState s_wctomb;
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} states;
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} _EUCCTypeInfo;
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#define _SS2 0x008e
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#define _SS3 0x008f
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#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
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#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
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#define _FUNCNAME(m) _citrus_EUC_##m
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#define _ENCODING_INFO _EUCEncodingInfo
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#define _CTYPE_INFO _EUCCTypeInfo
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#define _ENCODING_STATE _EUCState
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#define _ENCODING_MB_CUR_MAX(_ei_) (_ei_)->mb_cur_max
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#define _ENCODING_IS_STATE_DEPENDENT 0
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#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
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static __inline int
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_citrus_EUC_cs(unsigned int c)
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{
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c &= 0xff;
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return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
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}
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static __inline int
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_citrus_EUC_parse_variable(_EUCEncodingInfo *ei,
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const void *var, size_t lenvar)
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{
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const char *v, *e;
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int x;
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/* parse variable string */
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if (!var)
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return (EFTYPE);
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v = (const char *) var;
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while (*v == ' ' || *v == '\t')
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++v;
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ei->mb_cur_max = 1;
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for (x = 0; x < 4; ++x) {
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ei->count[x] = (int) strtol(v, (char **)&e, 0);
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if (v == e || !(v = e) || ei->count[x]<1 || ei->count[x]>4) {
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return (EFTYPE);
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}
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if (ei->mb_cur_max < ei->count[x])
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ei->mb_cur_max = ei->count[x];
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while (*v == ' ' || *v == '\t')
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++v;
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ei->bits[x] = (int) strtol(v, (char **)&e, 0);
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if (v == e || !(v = e)) {
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return (EFTYPE);
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}
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while (*v == ' ' || *v == '\t')
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++v;
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}
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ei->mask = (int)strtol(v, (char **)&e, 0);
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if (v == e || !(v = e)) {
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return (EFTYPE);
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}
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return 0;
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}
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static __inline void
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/*ARGSUSED*/
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_citrus_EUC_init_state(_EUCEncodingInfo *ei, _EUCState *s)
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{
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memset(s, 0, sizeof(*s));
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}
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static __inline void
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/*ARGSUSED*/
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_citrus_EUC_pack_state(_EUCEncodingInfo *ei, void *pspriv, const _EUCState *s)
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{
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memcpy(pspriv, (const void *)s, sizeof(*s));
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}
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static __inline void
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/*ARGSUSED*/
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_citrus_EUC_unpack_state(_EUCEncodingInfo *ei, _EUCState *s,
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const void *pspriv)
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{
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memcpy((void *)s, pspriv, sizeof(*s));
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}
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static int
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_citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, const char **s,
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size_t n, _EUCState *psenc, size_t *nresult)
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{
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wchar_t wchar;
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int c, cs, len;
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int chlenbak;
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const char *s0, *s1 = NULL;
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_DIAGASSERT(nresult != 0);
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_DIAGASSERT(ei != NULL);
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_DIAGASSERT(psenc != NULL);
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_DIAGASSERT(s != NULL);
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s0 = *s;
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if (s0 == NULL) {
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_citrus_EUC_init_state(ei, psenc);
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*nresult = 0; /* state independent */
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return (0);
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}
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chlenbak = psenc->chlen;
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/* make sure we have the first byte in the buffer */
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switch (psenc->chlen) {
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case 0:
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if (n < 1)
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goto restart;
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psenc->ch[0] = *s0++;
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psenc->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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/* illgeal state */
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goto encoding_error;
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}
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c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
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if (c == 0)
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goto encoding_error;
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while (psenc->chlen < c) {
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if (n < 1)
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goto restart;
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psenc->ch[psenc->chlen] = *s0++;
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psenc->chlen++;
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n--;
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}
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*s = s0;
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switch (cs) {
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case 3:
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case 2:
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/* skip SS2/SS3 */
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len = c - 1;
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s1 = &psenc->ch[1];
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break;
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case 1:
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case 0:
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len = c;
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s1 = &psenc->ch[0];
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break;
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default:
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goto encoding_error;
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}
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wchar = 0;
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while (len-- > 0)
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wchar = (wchar << 8) | (*s1++ & 0xff);
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wchar = (wchar & ~ei->mask) | ei->bits[cs];
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psenc->chlen = 0;
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if (pwc)
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*pwc = wchar;
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if (!wchar) {
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*nresult = 0;
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} else {
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*nresult = (size_t)(c - chlenbak);
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}
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return 0;
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encoding_error:
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psenc->chlen = 0;
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*nresult = (size_t)-1;
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return (EILSEQ);
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restart:
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*nresult = (size_t)-2;
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*s = s0;
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return (0);
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}
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static int
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_citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
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_EUCState *psenc, size_t *nresult)
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{
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wchar_t m, nm;
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int cs, i, ret;
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_DIAGASSERT(ei != NULL);
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_DIAGASSERT(nresult != 0);
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_DIAGASSERT(s != NULL);
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m = wc & ei->mask;
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nm = wc & ~m;
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for (cs = 0;
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cs < sizeof(ei->count)/sizeof(ei->count[0]);
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cs++) {
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if (m == ei->bits[cs])
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break;
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}
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/* fallback case - not sure if it is necessary */
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if (cs == sizeof(ei->count)/sizeof(ei->count[0]))
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cs = 1;
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i = ei->count[cs];
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if (n < i) {
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ret = E2BIG;
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goto err;
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}
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m = (cs) ? 0x80 : 0x00;
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switch (cs) {
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case 2:
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*s++ = _SS2;
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i--;
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break;
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case 3:
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*s++ = _SS3;
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i--;
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break;
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}
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while (i-- > 0)
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*s++ = ((nm >> (i << 3)) & 0xff) | m;
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*nresult = (size_t)ei->count[cs];
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return 0;
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err:
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*nresult = (size_t)-1;
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return ret;
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}
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static __inline int
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/*ARGSUSED*/
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_citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
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_csid_t * __restrict csid,
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_index_t * __restrict idx, wchar_t wc)
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{
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wchar_t m, nm;
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_DIAGASSERT(ei != NULL && csid != NULL && idx != NULL);
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m = wc & ei->mask;
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nm = wc & ~m;
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*csid = (_citrus_csid_t)m;
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*idx = (_citrus_index_t)nm;
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return (0);
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}
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static __inline int
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/*ARGSUSED*/
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_citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
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wchar_t * __restrict wc,
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_csid_t csid, _index_t idx)
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{
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_DIAGASSERT(ei != NULL && wc != NULL);
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if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
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return (EINVAL);
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*wc = (wchar_t)csid | (wchar_t)idx;
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return (0);
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}
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static __inline int
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/*ARGSUSED*/
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_citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei,
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_EUCState * __restrict psenc,
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int * __restrict rstate)
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{
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if (psenc->chlen == 0)
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*rstate = _STDENC_SDGEN_INITIAL;
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else
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*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
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return 0;
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}
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static int
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/*ARGSUSED*/
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_citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
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const void * __restrict var, size_t lenvar)
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{
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_DIAGASSERT(ei != NULL);
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return (_citrus_EUC_parse_variable(ei, var, lenvar));
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}
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static void
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/*ARGSUSED*/
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_citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei)
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{
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}
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/* ----------------------------------------------------------------------
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* public interface for ctype
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*/
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_CITRUS_CTYPE_DECLS(EUC);
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_CITRUS_CTYPE_DEF_OPS(EUC);
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#include "citrus_ctype_template.h"
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/* ----------------------------------------------------------------------
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* public interface for stdenc
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*/
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_CITRUS_STDENC_DECLS(EUC);
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_CITRUS_STDENC_DEF_OPS(EUC);
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#include "citrus_stdenc_template.h"
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