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#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>
#include "mbctype.h"
extern char *__locale_charset ();
/* for some conversions, we use the __count field as a place to store a state value */
#define __state __count
int
_DEFUN (_wctomb_r, (r, s, wchar, state),
struct _reent *r _AND
char *s _AND
wchar_t _wchar _AND
mbstate_t *state)
{
/* Avoids compiler warnings about comparisons that are always false
due to limited range when sizeof(wchar_t) is 2 but sizeof(wint_t)
is 4, as is the case on cygwin. */
wint_t wchar = _wchar;
if (strlen (__locale_charset ()) <= 1)
{ /* fall-through */ }
else if (!strcmp (__locale_charset (), "UTF-8"))
{
if (s == NULL)
return 0; /* UTF-8 encoding is not state-dependent */
if (state->__count == -4 && (wchar < 0xdc00 || wchar >= 0xdfff))
{
/* At this point only the second half of a surrogate pair is valid. */
r->_errno = EILSEQ;
return -1;
}
if (wchar <= 0x7f)
{
*s = wchar;
return 1;
}
else if (wchar >= 0x80 && wchar <= 0x7ff)
{
*s++ = 0xc0 | ((wchar & 0x7c0) >> 6);
*s = 0x80 | (wchar & 0x3f);
return 2;
}
else if (wchar >= 0x800 && wchar <= 0xffff)
{
if (wchar >= 0xd800 && wchar <= 0xdfff)
{
wint_t tmp;
/* UTF-16 surrogates -- must not occur in normal UCS-4 data */
if (sizeof (wchar_t) != 2)
{
r->_errno = EILSEQ;
return -1;
}
if (wchar >= 0xdc00)
{
/* Second half of a surrogate pair. It's not valid if
we don't have already read a first half of a surrogate
before. */
if (state->__count != -4)
{
r->_errno = EILSEQ;
return -1;
}
/* If it's valid, reconstruct the full Unicode value and
return the trailing three bytes of the UTF-8 char. */
tmp = (state->__value.__wchb[0] << 16)
| (state->__value.__wchb[1] << 8)
| (wchar & 0x3ff);
state->__count = 0;
*s++ = 0x80 | ((tmp & 0x3f000) >> 12);
*s++ = 0x80 | ((tmp & 0xfc0) >> 6);
*s = 0x80 | (tmp & 0x3f);
return 3;
}
/* First half of a surrogate pair. Store the state and return
the first byte of the UTF-8 char. */
tmp = ((wchar & 0x3ff) << 10) + 0x10000;
state->__value.__wchb[0] = (tmp >> 16) & 0xff;
state->__value.__wchb[1] = (tmp >> 8) & 0xff;
state->__count = -4;
*s = (0xf0 | ((tmp & 0x1c0000) >> 18));
return 1;
}
*s++ = 0xe0 | ((wchar & 0xf000) >> 12);
*s++ = 0x80 | ((wchar & 0xfc0) >> 6);
*s = 0x80 | (wchar & 0x3f);
return 3;
}
else if (wchar >= 0x10000 && wchar <= 0x10ffff)
{
*s++ = 0xf0 | ((wchar & 0x1c0000) >> 18);
*s++ = 0x80 | ((wchar & 0x3f000) >> 12);
*s++ = 0x80 | ((wchar & 0xfc0) >> 6);
*s = 0x80 | (wchar & 0x3f);
return 4;
}
else
{
r->_errno = EILSEQ;
return -1;
}
}
else if (!strcmp (__locale_charset (), "SJIS"))
{
unsigned char char2 = (unsigned char)wchar;
unsigned char char1 = (unsigned char)(wchar >> 8);
if (s == NULL)
return 0; /* not state-dependent */
if (char1 != 0x00)
{
/* first byte is non-zero..validate multi-byte char */
if (_issjis1(char1) && _issjis2(char2))
{
*s++ = (char)char1;
*s = (char)char2;
return 2;
}
else
{
r->_errno = EILSEQ;
return -1;
}
}
}
else if (!strcmp (__locale_charset (), "EUCJP"))
{
unsigned char char2 = (unsigned char)wchar;
unsigned char char1 = (unsigned char)(wchar >> 8);
if (s == NULL)
return 0; /* not state-dependent */
if (char1 != 0x00)
{
/* first byte is non-zero..validate multi-byte char */
if (_iseucjp (char1) && _iseucjp (char2))
{
*s++ = (char)char1;
*s = (char)char2;
return 2;
}
else
{
r->_errno = EILSEQ;
return -1;
}
}
}
else if (!strcmp (__locale_charset (), "JIS"))
{
int cnt = 0;
unsigned char char2 = (unsigned char)wchar;
unsigned char char1 = (unsigned char)(wchar >> 8);
if (s == NULL)
return 1; /* state-dependent */
if (char1 != 0x00)
{
/* first byte is non-zero..validate multi-byte char */
if (_isjis (char1) && _isjis (char2))
{
if (state->__state == 0)
{
/* must switch from ASCII to JIS state */
state->__state = 1;
*s++ = ESC_CHAR;
*s++ = '$';
*s++ = 'B';
cnt = 3;
}
*s++ = (char)char1;
*s = (char)char2;
return cnt + 2;
}
else
{
r->_errno = EILSEQ;
return -1;
}
}
else
{
if (state->__state != 0)
{
/* must switch from JIS to ASCII state */
state->__state = 0;
*s++ = ESC_CHAR;
*s++ = '(';
*s++ = 'B';
cnt = 3;
}
*s = (char)char2;
return cnt + 1;
}
}
if (s == NULL)
return 0;
/* otherwise we are dealing with a single byte character */
if ((size_t)wchar >= 0x100)
{
r->_errno = EILSEQ;
return -1;
}
*s = (char) wchar;
return 1;
}
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