NetBSD-5.0.2/lib/libc/citrus/modules/citrus_utf1632.c
/* $NetBSD: citrus_utf1632.c,v 1.9 2008/06/14 16:01:08 tnozaki Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_utf1632.c,v 1.9 2008/06/14 16:01:08 tnozaki Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <limits.h>
#include <wchar.h>
#include <sys/types.h>
#include <machine/endian.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_stdenc.h"
#include "citrus_bcs.h"
#include "citrus_utf1632.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct {
u_int8_t ch[4];
int chlen;
int current_endian;
} _UTF1632State;
typedef struct {
int preffered_endian;
unsigned int cur_max;
#define _ENDIAN_UNKNOWN 0
#define _ENDIAN_BIG 1
#define _ENDIAN_LITTLE 2
u_int32_t mode;
#define _MODE_UTF32 0x00000001U
#define _MODE_FORCE_ENDIAN 0x00000002U
} _UTF1632EncodingInfo;
#define _FUNCNAME(m) _citrus_UTF1632_##m
#define _ENCODING_INFO _UTF1632EncodingInfo
#define _ENCODING_STATE _UTF1632State
#define _ENCODING_MB_CUR_MAX(_ei_) ((_ei_)->cur_max)
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei, _UTF1632State *s)
{
memset(s, 0, sizeof(*s));
}
static int
_citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
const char **s, size_t n, _UTF1632State *psenc,
size_t *nresult)
{
int chlenbak, endian, needlen;
wchar_t wc;
size_t result;
const char *s0;
_DIAGASSERT(nresult != 0);
_DIAGASSERT(ei != NULL);
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
s0 = *s;
if (s0 == NULL) {
_citrus_UTF1632_init_state(ei, psenc);
*nresult = 0; /* state independent */
return (0);
}
result = 0;
chlenbak = psenc->chlen;
refetch:
if ((ei->mode & _MODE_UTF32) != 0 || chlenbak>=2)
needlen = 4;
else
needlen = 2;
while (chlenbak < needlen) {
if (n==0)
goto restart;
psenc->ch[chlenbak++] = *s0++;
n--;
result++;
}
/* judge endian marker */
if ((ei->mode & _MODE_UTF32) == 0) {
/* UTF16 */
if (psenc->ch[0]==0xFE && psenc->ch[1]==0xFF) {
psenc->current_endian = _ENDIAN_BIG;
chlenbak = 0;
goto refetch;
} else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE) {
psenc->current_endian = _ENDIAN_LITTLE;
chlenbak = 0;
goto refetch;
}
} else {
/* UTF32 */
if (psenc->ch[0]==0x00 && psenc->ch[1]==0x00 &&
psenc->ch[2]==0xFE && psenc->ch[3]==0xFF) {
psenc->current_endian = _ENDIAN_BIG;
chlenbak = 0;
goto refetch;
} else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE &&
psenc->ch[2]==0x00 && psenc->ch[3]==0x00) {
psenc->current_endian = _ENDIAN_LITTLE;
chlenbak = 0;
goto refetch;
}
}
if ((ei->mode & _MODE_FORCE_ENDIAN) != 0 ||
psenc->current_endian == _ENDIAN_UNKNOWN)
endian = ei->preffered_endian;
else
endian = psenc->current_endian;
/* get wc */
if ((ei->mode & _MODE_UTF32) == 0) {
/* UTF16 */
if (needlen==2) {
switch (endian) {
case _ENDIAN_LITTLE:
wc = (psenc->ch[0] |
((wchar_t)psenc->ch[1] << 8));
break;
case _ENDIAN_BIG:
wc = (psenc->ch[1] |
((wchar_t)psenc->ch[0] << 8));
break;
default:
goto ilseq;
}
if (wc >= 0xD800 && wc <= 0xDBFF) {
/* surrogate high */
needlen=4;
goto refetch;
}
} else {
/* surrogate low */
wc -= 0xD800; /* wc : surrogate high (see above) */
wc <<= 10;
switch (endian) {
case _ENDIAN_LITTLE:
if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
goto ilseq;
wc |= psenc->ch[2];
wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
break;
case _ENDIAN_BIG:
if (psenc->ch[3]<0xDC || psenc->ch[3]>0xDF)
goto ilseq;
wc |= psenc->ch[3];
wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
break;
default:
goto ilseq;
}
wc += 0x10000;
}
} else {
/* UTF32 */
switch (endian) {
case _ENDIAN_LITTLE:
wc = (psenc->ch[0] |
((wchar_t)psenc->ch[1] << 8) |
((wchar_t)psenc->ch[2] << 16) |
((wchar_t)psenc->ch[3] << 24));
break;
case _ENDIAN_BIG:
wc = (psenc->ch[3] |
((wchar_t)psenc->ch[2] << 8) |
((wchar_t)psenc->ch[1] << 16) |
((wchar_t)psenc->ch[0] << 24));
break;
default:
goto ilseq;
}
if (wc >= 0xD800 && wc <= 0xDFFF)
goto ilseq;
}
*pwc = wc;
psenc->chlen = 0;
*nresult = result;
*s = s0;
return (0);
ilseq:
*nresult = (size_t)-1;
psenc->chlen = 0;
return (EILSEQ);
restart:
*nresult = (size_t)-2;
psenc->chlen = chlenbak;
*s = s0;
return (0);
}
static int
_citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
wchar_t wc, _UTF1632State *psenc,
size_t *nresult)
{
int ret;
wchar_t wc2;
static const char _bom[4] = {
#if BYTE_ORDER == BIG_ENDIAN
0x00, 0x00, 0xFE, 0xFF,
#else
0xFF, 0xFE, 0x00, 0x00,
#endif
};
const char *bom = &_bom[0];
size_t cnt;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(nresult != 0);
_DIAGASSERT(s != NULL);
cnt = (size_t)0;
if (psenc->current_endian == _ENDIAN_UNKNOWN) {
if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
if (ei->mode & _MODE_UTF32) {
cnt = 4;
} else {
cnt = 2;
#if BYTE_ORDER == BIG_ENDIAN
bom += 2;
#endif
}
if (n < cnt)
goto e2big;
memcpy(s, bom, cnt);
s += cnt, n -= cnt;
}
psenc->current_endian = ei->preffered_endian;
}
wc2 = 0;
if ((ei->mode & _MODE_UTF32)==0) {
/* UTF16 */
if (wc>0xFFFF) {
/* surrogate */
if (wc>0x10FFFF)
goto ilseq;
if (n < 4)
goto e2big;
cnt += 4;
wc -= 0x10000;
wc2 = (wc & 0x3FF) | 0xDC00;
wc = (wc>>10) | 0xD800;
} else {
if (n < 2)
goto e2big;
cnt += 2;
}
surrogate:
switch (psenc->current_endian) {
case _ENDIAN_BIG:
s[1] = wc;
s[0] = (wc >>= 8);
break;
case _ENDIAN_LITTLE:
s[0] = wc;
s[1] = (wc >>= 8);
break;
}
if (wc2!=0) {
wc = wc2;
wc2 = 0;
s += 2;
goto surrogate;
}
} else {
/* UTF32 */
if (wc >= 0xD800 && wc <= 0xDFFF)
goto ilseq;
if (n < 4)
goto e2big;
cnt += 4;
switch (psenc->current_endian) {
case _ENDIAN_BIG:
s[3] = wc;
s[2] = (wc >>= 8);
s[1] = (wc >>= 8);
s[0] = (wc >>= 8);
break;
case _ENDIAN_LITTLE:
s[0] = wc;
s[1] = (wc >>= 8);
s[2] = (wc >>= 8);
s[3] = (wc >>= 8);
break;
}
}
*nresult = cnt;
return 0;
ilseq:
*nresult = (size_t)-1;
return EILSEQ;
e2big:
*nresult = (size_t)-1;
return E2BIG;
}
static void
parse_variable(_UTF1632EncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
#define MATCH(x, act) \
do { \
if (lenvar >= (sizeof(#x)-1) && \
_bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) { \
act; \
lenvar -= sizeof(#x)-1; \
p += sizeof(#x)-1; \
} \
} while (/*CONSTCOND*/0)
const char *p;
p = var;
while (lenvar>0) {
switch (*p) {
case 'B':
case 'b':
MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
break;
case 'L':
case 'l':
MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
break;
case 'F':
case 'f':
MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
break;
case 'U':
case 'u':
MATCH(utf32, ei->mode |= _MODE_UTF32);
break;
}
p++;
lenvar--;
}
}
static int
/*ARGSUSED*/
_citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
const void * __restrict var,
size_t lenvar)
{
_DIAGASSERT(ei != NULL);
memset((void *)ei, 0, sizeof(*ei));
parse_variable(ei, var, lenvar);
if ((ei->mode&_MODE_UTF32)==0)
ei->cur_max = 6; /* endian + surrogate */
else
ei->cur_max = 8; /* endian + normal */
if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
#if BYTE_ORDER == BIG_ENDIAN
ei->preffered_endian = _ENDIAN_BIG;
#else
ei->preffered_endian = _ENDIAN_LITTLE;
#endif
}
return (0);
}
static void
/*ARGSUSED*/
_citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei)
{
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei,
_csid_t * __restrict csid,
_index_t * __restrict idx,
_wc_t wc)
{
_DIAGASSERT(csid != NULL && idx != NULL);
*csid = 0;
*idx = (_index_t)wc;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei,
_wc_t * __restrict wc,
_csid_t csid, _index_t idx)
{
_DIAGASSERT(wc != NULL);
if (csid != 0)
return (EILSEQ);
*wc = (_wc_t)idx;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei,
_UTF1632State * __restrict psenc,
int * __restrict rstate)
{
if (psenc->chlen == 0)
*rstate = _STDENC_SDGEN_INITIAL;
else
*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
return 0;
}
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(UTF1632);
_CITRUS_STDENC_DEF_OPS(UTF1632);
#include "citrus_stdenc_template.h"