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/*
* Copyright (C) 2000-2002 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, write to the Free Software Foundation, Inc., 59 Temple Place -
* Suite 330, Boston, MA 02111-1307, USA.
*/
/* This file defines three conversion loops:
- from wchar_t to anything else,
- from anything else to wchar_t,
- from wchar_t to wchar_t.
*/
#if HAVE_WCRTOMB || HAVE_MBRTOWC
# include <wchar.h>
# define BUF_SIZE 64 /* assume MB_LEN_MAX <= 64 */
/* Some systems, like BeOS, have multibyte encodings but lack mbstate_t. */
extern size_t mbrtowc ();
# ifdef mbstate_t
# define mbrtowc(pwc, s, n, ps) (mbrtowc)(pwc, s, n, 0)
# define mbsinit(ps) 1
# endif
# ifndef mbsinit
# if !HAVE_MBSINIT
# define mbsinit(ps) 1
# endif
# endif
#else
# ifndef mbstate_t
typedef int mbstate_t;
# endif
#endif
/*
* The first two conversion loops have an extended conversion descriptor.
*/
struct wchar_conv_struct {
struct conv_struct parent;
mbstate_t state;
};
#if HAVE_WCRTOMB
/* From wchar_t to anything else. */
static size_t wchar_from_loop_convert (iconv_t icd,
const char* * inbuf, size_t *inbytesleft,
char* * outbuf, size_t *outbytesleft)
{
struct wchar_conv_struct * wcd = (struct wchar_conv_struct *) icd;
size_t result = 0;
while (*inbytesleft >= sizeof(wchar_t)) {
const wchar_t * inptr = (const wchar_t *) *inbuf;
size_t inleft = *inbytesleft;
char buf[BUF_SIZE];
mbstate_t state = wcd->state;
size_t bufcount = 0;
while (inleft >= sizeof(wchar_t)) {
/* Convert one wchar_t to multibyte representation. */
size_t count = wcrtomb(buf+bufcount,*inptr,&state);
if (count == (size_t)(-1)) {
/* Invalid input. */
if (!wcd->parent.discard_ilseq) {
errno = EILSEQ;
return -1;
}
count = 0;
}
inptr++;
inleft -= sizeof(wchar_t);
bufcount += count;
if (count == 0) {
/* Continue, append next wchar_t. */
} else {
/* Attempt to convert the accumulated multibyte representations
to the target encoding. */
const char* bufptr = buf;
size_t bufleft = bufcount;
char* outptr = *outbuf;
size_t outleft = *outbytesleft;
size_t res = unicode_loop_convert(&wcd->parent,
&bufptr,&bufleft,
&outptr,&outleft);
if (res == (size_t)(-1)) {
if (errno == EILSEQ)
/* Invalid input. */
return -1;
else if (errno == E2BIG)
/* Output buffer too small. */
return -1;
else if (errno == EINVAL) {
/* Continue, append next wchar_t, but avoid buffer overrun. */
if (bufcount + MB_CUR_MAX > BUF_SIZE)
abort();
} else
abort();
} else {
/* Successful conversion. */
wcd->state = state;
*inbuf = (const char *) inptr;
*inbytesleft = inleft;
*outbuf = outptr;
*outbytesleft = outleft;
result += res;
break;
}
}
}
}
return result;
}
static size_t wchar_from_loop_reset (iconv_t icd,
char* * outbuf, size_t *outbytesleft)
{
struct wchar_conv_struct * wcd = (struct wchar_conv_struct *) icd;
if (outbuf == NULL || *outbuf == NULL) {
/* Reset the states. */
memset(&wcd->state,'\0',sizeof(mbstate_t));
return unicode_loop_reset(&wcd->parent,NULL,NULL);
} else {
if (!mbsinit(&wcd->state)) {
mbstate_t state = wcd->state;
char buf[BUF_SIZE];
size_t bufcount = wcrtomb(buf,(wchar_t)0,&state);
if (bufcount == (size_t)(-1) || bufcount == 0 || buf[bufcount-1] != '\0')
abort();
else {
const char* bufptr = buf;
size_t bufleft = bufcount-1;
char* outptr = *outbuf;
size_t outleft = *outbytesleft;
size_t res = unicode_loop_convert(&wcd->parent,
&bufptr,&bufleft,
&outptr,&outleft);
if (res == (size_t)(-1)) {
if (errno == E2BIG)
return -1;
else
abort();
} else {
res = unicode_loop_reset(&wcd->parent,&outptr,&outleft);
if (res == (size_t)(-1))
return res;
else {
/* Successful. */
wcd->state = state;
*outbuf = outptr;
*outbytesleft = outleft;
return 0;
}
}
}
} else
return unicode_loop_reset(&wcd->parent,outbuf,outbytesleft);
}
}
#endif
#if HAVE_MBRTOWC
/* From anything else to wchar_t. */
static size_t wchar_to_loop_convert (iconv_t icd,
const char* * inbuf, size_t *inbytesleft,
char* * outbuf, size_t *outbytesleft)
{
struct wchar_conv_struct * wcd = (struct wchar_conv_struct *) icd;
size_t result = 0;
while (*inbytesleft > 0) {
size_t incount;
for (incount = 1; incount <= *inbytesleft; incount++) {
char buf[BUF_SIZE];
const char* inptr = *inbuf;
size_t inleft = incount;
char* bufptr = buf;
size_t bufleft = BUF_SIZE;
size_t res = unicode_loop_convert(&wcd->parent,
&inptr,&inleft,
&bufptr,&bufleft);
if (res == (size_t)(-1)) {
if (errno == EILSEQ)
/* Invalid input. */
return -1;
else if (errno == EINVAL) {
/* Incomplete input. Next try with one more input byte. */
} else
/* E2BIG shouldn't occur. */
abort();
} else {
/* Successful conversion. */
size_t bufcount = bufptr-buf; /* = BUF_SIZE-bufleft */
mbstate_t state = wcd->state;
wchar_t wc;
res = mbrtowc(&wc,buf,bufcount,&state);
if (res == (size_t)(-2)) {
/* Next try with one more input byte. */
} else {
if (res == (size_t)(-1)) {
/* Invalid input. */
if (!wcd->parent.discard_ilseq)
return -1;
} else {
if (*outbytesleft < sizeof(wchar_t)) {
errno = E2BIG;
return -1;
}
*(wchar_t*) *outbuf = wc;
/* Restoring the state is not needed because it is the initial
state anyway: For all known locale encodings, the multibyte
to wchar_t conversion doesn't have shift state, and we have
excluded partial accumulated characters. */
/* wcd->state = state; */
*outbuf += sizeof(wchar_t);
*outbytesleft -= sizeof(wchar_t);
}
*inbuf += incount;
*inbytesleft -= incount;
result += res;
break;
}
}
}
}
return result;
}
static size_t wchar_to_loop_reset (iconv_t icd,
char* * outbuf, size_t *outbytesleft)
{
struct wchar_conv_struct * wcd = (struct wchar_conv_struct *) icd;
size_t res = unicode_loop_reset(&wcd->parent,outbuf,outbytesleft);
if (res == (size_t)(-1))
return res;
memset(&wcd->state,0,sizeof(mbstate_t));
return 0;
}
#endif
/* From wchar_t to wchar_t. */
static size_t wchar_id_loop_convert (iconv_t icd,
const char* * inbuf, size_t *inbytesleft,
char* * outbuf, size_t *outbytesleft)
{
const wchar_t* inptr = (const wchar_t*) *inbuf;
size_t inleft = *inbytesleft / sizeof(wchar_t);
wchar_t* outptr = (wchar_t*) *outbuf;
size_t outleft = *outbytesleft / sizeof(wchar_t);
size_t count = (inleft <= outleft ? inleft : outleft);
if (count > 0) {
*inbytesleft -= count * sizeof(wchar_t);
*outbytesleft -= count * sizeof(wchar_t);
do
*outptr++ = *inptr++;
while (--count > 0);
*inbuf = (const char*) inptr;
*outbuf = (char*) outptr;
}
return 0;
}
static size_t wchar_id_loop_reset (iconv_t icd,
char* * outbuf, size_t *outbytesleft)
{
return 0;
}
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