minix/lib/libc/citrus/modules/citrus_ues.c

473 lines
10 KiB
C
Raw Normal View History

/* $NetBSD: citrus_ues.c,v 1.2 2010/12/07 22:01:22 joerg Exp $ */
/*-
* Copyright (c)2006 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_ues.c,v 1.2 2010/12/07 22:01:22 joerg Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
#include <wchar.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "citrus_ctype.h"
#include "citrus_stdenc.h"
#include "citrus_ues.h"
typedef struct {
int mode;
#define MODE_C99 1
size_t mb_cur_max;
} _UESEncodingInfo;
typedef struct {
int chlen;
char ch[12];
} _UESState;
typedef struct {
_UESEncodingInfo ei;
struct {
/* for future multi-locale facility */
_UESState s_mblen;
_UESState s_mbrlen;
_UESState s_mbrtowc;
_UESState s_mbtowc;
_UESState s_mbsrtowcs;
_UESState s_wcrtomb;
_UESState s_wcsrtombs;
_UESState s_wctomb;
} states;
} _UESCTypeInfo;
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
#define _FUNCNAME(m) _citrus_UES_##m
#define _ENCODING_INFO _UESEncodingInfo
#define _CTYPE_INFO _UESCTypeInfo
#define _ENCODING_STATE _UESState
#define _ENCODING_MB_CUR_MAX(_ei_) (_ei_)->mb_cur_max
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_UES_init_state(_UESEncodingInfo * __restrict ei,
_UESState * __restrict psenc)
{
psenc->chlen = 0;
}
static __inline void
/*ARGSUSED*/
_citrus_UES_pack_state(_UESEncodingInfo * __restrict ei,
void *__restrict pspriv, const _UESState * __restrict psenc)
{
/* ei seem to be unused */
_DIAGASSERT(pspriv != NULL);
_DIAGASSERT(psenc != NULL);
memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
}
static __inline void
/*ARGSUSED*/
_citrus_UES_unpack_state(_UESEncodingInfo * __restrict ei,
_UESState * __restrict psenc, const void * __restrict pspriv)
{
/* ei seem to be unused */
_DIAGASSERT(psenc != NULL);
_DIAGASSERT(pspriv != NULL);
memcpy((void *)psenc, pspriv, sizeof(*psenc));
}
static __inline int
to_int(int ch)
{
if (ch >= '0' && ch <= '9')
return ch - '0';
else if (ch >= 'A' && ch <= 'F')
return (ch - 'A') + 10;
else if (ch >= 'a' && ch <= 'f')
return (ch - 'a') + 10;
return -1;
}
#define ESCAPE '\\'
#define UCS2_ESC 'u'
#define UCS4_ESC 'U'
#define UCS2_BIT 16
#define UCS4_BIT 32
#define BMP_MAX UINT32_C(0xFFFF)
#define UCS2_MAX UINT32_C(0x10FFFF)
#define UCS4_MAX UINT32_C(0x7FFFFFFF)
static const char *xdig = "0123456789abcdef";
static __inline int
to_str(char *s, wchar_t wc, int bit)
{
char *p;
p = s;
*p++ = ESCAPE;
switch (bit) {
case UCS2_BIT:
*p++ = UCS2_ESC;
break;
case UCS4_BIT:
*p++ = UCS4_ESC;
break;
default:
abort();
}
do {
*p++ = xdig[(wc >> (bit -= 4)) & 0xF];
} while (bit > 0);
return p - s;
}
static __inline int
is_hi_surrogate(wchar_t wc)
{
return wc >= 0xD800 && wc <= 0xDBFF;
}
static __inline int
is_lo_surrogate(wchar_t wc)
{
return wc >= 0xDC00 && wc <= 0xDFFF;
}
static __inline wchar_t
surrogate_to_ucs(wchar_t hi, wchar_t lo)
{
_DIAGASSERT(is_hi_surrogate(hi));
_DIAGASSERT(is_lo_surrogate(lo));
hi -= 0xD800;
lo -= 0xDC00;
return (hi << 10 | lo) + 0x10000;
}
static __inline void
ucs_to_surrogate(wchar_t wc, wchar_t * __restrict hi, wchar_t * __restrict lo)
{
_DIAGASSERT(hi != NULL);
_DIAGASSERT(lo != NULL);
_DIAGASSERT(wc >= 0x10000);
wc -= 0x10000;
*hi = (wc >> 10) + 0xD800;
*lo = (wc & 0x3FF) + 0xDC00;
}
static __inline int
is_basic(wchar_t wc)
{
return (uint32_t)wc <= 0x9F &&
wc != 0x24 && wc != 0x40 && wc != 0x60;
}
static int
_citrus_UES_mbrtowc_priv(_UESEncodingInfo * __restrict ei,
wchar_t * __restrict pwc, const char ** __restrict s, size_t n,
_UESState * __restrict psenc, size_t * __restrict nresult)
{
const char *s0;
int ch, head, tail, i, num;
wchar_t hi, wc;
_DIAGASSERT(ei != NULL);
/* pwc may be null */
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
_DIAGASSERT(nresult != NULL);
if (*s == NULL) {
_citrus_UES_init_state(ei, psenc);
*nresult = 0;
return 0;
}
s0 = *s;
hi = (wchar_t)0;
tail = 0;
surrogate:
wc = (wchar_t)0;
head = tail;
if (psenc->chlen == head) {
if (n-- < 1)
goto restart;
psenc->ch[psenc->chlen++] = *s0++;
}
ch = (unsigned char)psenc->ch[head++];
if (ch == ESCAPE) {
if (psenc->chlen == head) {
if (n-- < 1)
goto restart;
psenc->ch[psenc->chlen++] = *s0++;
}
switch (psenc->ch[head]) {
case UCS2_ESC:
tail += 6;
break;
case UCS4_ESC:
if (ei->mode & MODE_C99) {
tail = 10;
break;
}
/*FALLTHROUGH*/
default:
tail = 0;
}
++head;
}
for (; head < tail; ++head) {
if (psenc->chlen == head) {
if (n-- < 1) {
restart:
*s = s0;
*nresult = (size_t)-2;
return 0;
}
psenc->ch[psenc->chlen++] = *s0++;
}
num = to_int((int)(unsigned char)psenc->ch[head]);
if (num < 0) {
tail = 0;
break;
}
wc = (wc << 4) | num;
}
head = 0;
switch (tail) {
case 0:
break;
case 6:
if (hi != (wchar_t)0)
break;
if ((ei->mode & MODE_C99) == 0) {
if (is_hi_surrogate(wc) != 0) {
hi = wc;
goto surrogate;
}
if ((uint32_t)wc <= 0x7F /* XXX */ ||
is_lo_surrogate(wc) != 0)
break;
goto done;
}
/*FALLTHROUGH*/
case 10:
if (is_basic(wc) == 0 && (uint32_t)wc <= UCS4_MAX &&
is_hi_surrogate(wc) == 0 && is_lo_surrogate(wc) == 0)
goto done;
*nresult = (size_t)-1;
return EILSEQ;
case 12:
if (is_lo_surrogate(wc) == 0)
break;
wc = surrogate_to_ucs(hi, wc);
goto done;
}
ch = (unsigned char)psenc->ch[0];
head = psenc->chlen;
if (--head > 0)
memmove(&psenc->ch[0], &psenc->ch[1], head);
wc = (wchar_t)ch;
done:
psenc->chlen = head;
if (pwc != NULL)
*pwc = wc;
*nresult = (size_t)((wc == 0) ? 0 : (s0 - *s));
*s = s0;
return 0;
}
static int
_citrus_UES_wcrtomb_priv(_UESEncodingInfo * __restrict ei,
char * __restrict s, size_t n, wchar_t wc,
_UESState * __restrict psenc, size_t * __restrict nresult)
{
wchar_t hi, lo;
if (psenc->chlen != 0)
return EINVAL;
if ((ei->mode & MODE_C99) ? is_basic(wc) : (uint32_t)wc <= 0x7F) {
if (n-- < 1)
goto e2big;
psenc->ch[psenc->chlen++] = (char)wc;
} else if ((uint32_t)wc <= BMP_MAX) {
if (n < 6)
goto e2big;
psenc->chlen = to_str(&psenc->ch[0], wc, UCS2_BIT);
} else if ((ei->mode & MODE_C99) == 0 && (uint32_t)wc <= UCS2_MAX) {
if (n < 12)
goto e2big;
ucs_to_surrogate(wc, &hi, &lo);
psenc->chlen += to_str(&psenc->ch[0], hi, UCS2_BIT);
psenc->chlen += to_str(&psenc->ch[6], lo, UCS2_BIT);
} else if ((ei->mode & MODE_C99) && (uint32_t)wc <= UCS4_MAX) {
if (n < 10)
goto e2big;
psenc->chlen = to_str(&psenc->ch[0], wc, UCS4_BIT);
} else {
*nresult = (size_t)-1;
return EILSEQ;
}
memcpy(s, psenc->ch, psenc->chlen);
*nresult = psenc->chlen;
psenc->chlen = 0;
return 0;
e2big:
*nresult = (size_t)-1;
return E2BIG;
}
/*ARGSUSED*/
static int
_citrus_UES_stdenc_wctocs(_UESEncodingInfo * __restrict ei,
_csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
{
/* ei seem to be unused */
_DIAGASSERT(csid != NULL);
_DIAGASSERT(idx != NULL);
*csid = 0;
*idx = (_index_t)wc;
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_UES_stdenc_cstowc(_UESEncodingInfo * __restrict ei,
wchar_t * __restrict wc, _csid_t csid, _index_t idx)
{
/* ei seem to be unused */
_DIAGASSERT(wc != NULL);
if (csid != 0)
return EILSEQ;
*wc = (wchar_t)idx;
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_UES_stdenc_get_state_desc_generic(_UESEncodingInfo * __restrict ei,
_UESState * __restrict psenc, int * __restrict rstate)
{
_DIAGASSERT(psenc != NULL);
_DIAGASSERT(rstate != NULL);
if (psenc->chlen == 0)
*rstate = _STDENC_SDGEN_INITIAL;
else
*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR; /* XXX */
return 0;
}
static void
/*ARGSUSED*/
_citrus_UES_encoding_module_uninit(_UESEncodingInfo *ei)
{
/* ei seems to be unused */
}
static int
/*ARGSUSED*/
_citrus_UES_encoding_module_init(_UESEncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
const char *p;
_DIAGASSERT(ei != NULL);
p = var;
#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)
memset((void *)ei, 0, sizeof(*ei));
while (lenvar > 0) {
switch (_bcs_toupper(*p)) {
case 'C':
MATCH(C99, ei->mode |= MODE_C99);
break;
}
++p;
--lenvar;
}
ei->mb_cur_max = (ei->mode & MODE_C99) ? 10 : 12;
return 0;
}
/* ----------------------------------------------------------------------
* public interface for ctype
*/
_CITRUS_CTYPE_DECLS(UES);
_CITRUS_CTYPE_DEF_OPS(UES);
#include "citrus_ctype_template.h"
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(UES);
_CITRUS_STDENC_DEF_OPS(UES);
#include "citrus_stdenc_template.h"