NetBSD-5.0.2/lib/libc/citrus/modules/citrus_utf8.c
/* $NetBSD: citrus_utf8.c,v 1.17 2008/06/14 16:01:08 tnozaki Exp $ */
/*-
* Copyright (c)2002 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.
*/
/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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_utf8.c,v 1.17 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 <wchar.h>
#include <sys/types.h>
#include <limits.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_ctype.h"
#include "citrus_stdenc.h"
#include "citrus_utf8.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
static int _UTF8_count_array[256];
static int const *_UTF8_count = NULL;
static const u_int32_t _UTF8_range[] = {
0, /*dummy*/
0x00000000, 0x00000080, 0x00000800, 0x00010000,
0x00200000, 0x04000000, 0x80000000,
};
typedef struct {
char ch[6];
int chlen;
} _UTF8State;
typedef struct {
} _UTF8EncodingInfo;
typedef struct {
_UTF8EncodingInfo ei;
struct {
/* for future multi-locale facility */
_UTF8State s_mblen;
_UTF8State s_mbrlen;
_UTF8State s_mbrtowc;
_UTF8State s_mbtowc;
_UTF8State s_mbsrtowcs;
_UTF8State s_wcrtomb;
_UTF8State s_wcsrtombs;
_UTF8State s_wctomb;
} states;
} _UTF8CTypeInfo;
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_ei_, _func_) (_ei_)->states.s_##_func_
#define _FUNCNAME(m) _citrus_UTF8_##m
#define _ENCODING_INFO _UTF8EncodingInfo
#define _CTYPE_INFO _UTF8CTypeInfo
#define _ENCODING_STATE _UTF8State
#define _ENCODING_MB_CUR_MAX(_ei_) 6
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
_UTF8_init_count(void)
{
int i;
if (!_UTF8_count) {
memset(_UTF8_count_array, 0, sizeof(_UTF8_count_array));
for (i = 0; i <= 0x7f; i++)
_UTF8_count_array[i] = 1;
for (i = 0xc0; i <= 0xdf; i++)
_UTF8_count_array[i] = 2;
for (i = 0xe0; i <= 0xef; i++)
_UTF8_count_array[i] = 3;
for (i = 0xf0; i <= 0xf7; i++)
_UTF8_count_array[i] = 4;
for (i = 0xf8; i <= 0xfb; i++)
_UTF8_count_array[i] = 5;
for (i = 0xfc; i <= 0xfd; i++)
_UTF8_count_array[i] = 6;
_UTF8_count = _UTF8_count_array;
}
}
static int
_UTF8_findlen(wchar_t v)
{
int i;
u_int32_t c;
c = (u_int32_t)v; /*XXX*/
for (i = 1; i < sizeof(_UTF8_range) / sizeof(_UTF8_range[0]) - 1; i++)
if (c >= _UTF8_range[i] && c < _UTF8_range[i + 1])
return i;
return -1; /*out of range*/
}
static __inline int
_UTF8_surrogate(wchar_t wc)
{
return wc >= 0xd800 && wc <= 0xdfff;
}
static __inline void
/*ARGSUSED*/
_citrus_UTF8_init_state(_UTF8EncodingInfo *ei, _UTF8State *s)
{
s->chlen = 0;
}
static __inline void
/*ARGSUSED*/
_citrus_UTF8_pack_state(_UTF8EncodingInfo *ei, void *pspriv,
const _UTF8State *s)
{
memcpy(pspriv, (const void *)s, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_UTF8_unpack_state(_UTF8EncodingInfo *ei, _UTF8State *s,
const void *pspriv)
{
memcpy((void *)s, pspriv, sizeof(*s));
}
static int
_citrus_UTF8_mbrtowc_priv(_UTF8EncodingInfo *ei, wchar_t *pwc, const char **s,
size_t n, _UTF8State *psenc, size_t *nresult)
{
wchar_t wchar;
const char *s0;
int c;
int i;
_DIAGASSERT(nresult != 0);
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
s0 = *s;
if (s0 == NULL) {
_citrus_UTF8_init_state(ei, psenc);
*nresult = 0; /* state independent */
return 0;
}
/* make sure we have the first byte in the buffer */
if (psenc->chlen == 0) {
if (n-- < 1)
goto restart;
psenc->ch[psenc->chlen++] = *s0++;
}
c = _UTF8_count[psenc->ch[0] & 0xff];
if (c < 1 || c < psenc->chlen)
goto ilseq;
if (c == 1)
wchar = psenc->ch[0] & 0xff;
else {
while (psenc->chlen < c) {
if (n-- < 1)
goto restart;
psenc->ch[psenc->chlen++] = *s0++;
}
wchar = psenc->ch[0] & (0x7f >> c);
for (i = 1; i < c; i++) {
if ((psenc->ch[i] & 0xc0) != 0x80)
goto ilseq;
wchar <<= 6;
wchar |= (psenc->ch[i] & 0x3f);
}
if (_UTF8_surrogate(wchar) || _UTF8_findlen(wchar) != c)
goto ilseq;
}
if (pwc != NULL)
*pwc = wchar;
*nresult = (wchar == 0) ? 0 : s0 - *s;
*s = s0;
psenc->chlen = 0;
return 0;
ilseq:
*nresult = (size_t)-1;
return EILSEQ;
restart:
*s = s0;
*nresult = (size_t)-2;
return 0;
}
static int
_citrus_UTF8_wcrtomb_priv(_UTF8EncodingInfo *ei, char *s, size_t n, wchar_t wc,
_UTF8State *psenc, size_t *nresult)
{
int cnt, i, ret;
wchar_t c;
_DIAGASSERT(nresult != 0);
_DIAGASSERT(s != NULL);
if (_UTF8_surrogate(wc)) {
ret = EILSEQ;
goto err;
}
cnt = _UTF8_findlen(wc);
if (cnt <= 0 || cnt > 6) {
/* invalid UCS4 value */
ret = EILSEQ;
goto err;
}
if (n < cnt) {
/* bound check failure */
ret = E2BIG;
goto err;
}
c = wc;
if (s) {
for (i = cnt - 1; i > 0; i--) {
s[i] = 0x80 | (c & 0x3f);
c >>= 6;
}
s[0] = c;
if (cnt == 1)
s[0] &= 0x7f;
else {
s[0] &= (0x7f >> cnt);
s[0] |= ((0xff00 >> cnt) & 0xff);
}
}
*nresult = (size_t)cnt;
return 0;
err:
*nresult = (size_t)-1;
return ret;
}
static __inline int
/*ARGSUSED*/
_citrus_UTF8_stdenc_wctocs(_UTF8EncodingInfo * __restrict ei,
_csid_t * __restrict csid,
_index_t * __restrict idx,
wchar_t wc)
{
_DIAGASSERT(csid != NULL && idx != NULL);
*csid = 0;
*idx = (_citrus_index_t)wc;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF8_stdenc_cstowc(_UTF8EncodingInfo * __restrict ei,
wchar_t * __restrict wc,
_csid_t csid, _index_t idx)
{
_DIAGASSERT(wc != NULL);
if (csid != 0)
return (EILSEQ);
*wc = (wchar_t)idx;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF8_stdenc_get_state_desc_generic(_UTF8EncodingInfo * __restrict ei,
_UTF8State * __restrict psenc,
int * __restrict rstate)
{
if (psenc->chlen == 0)
*rstate = _STDENC_SDGEN_INITIAL;
else
*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
return 0;
}
static int
/*ARGSUSED*/
_citrus_UTF8_encoding_module_init(_UTF8EncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
_UTF8_init_count();
return 0;
}
static void
/*ARGSUSED*/
_citrus_UTF8_encoding_module_uninit(_UTF8EncodingInfo *ei)
{
}
/* ----------------------------------------------------------------------
* public interface for ctype
*/
_CITRUS_CTYPE_DECLS(UTF8);
_CITRUS_CTYPE_DEF_OPS(UTF8);
#include "citrus_ctype_template.h"
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(UTF8);
_CITRUS_STDENC_DEF_OPS(UTF8);
#include "citrus_stdenc_template.h"