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newlib-cygwin/newlib/libc/stdlib/mbtowc_r.c

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#include <stdlib.h>
#include <locale.h>
#include "mbctype.h"
#include <wchar.h>
#include <string.h>
#ifdef MB_CAPABLE
typedef enum { ESCAPE, DOLLAR, BRACKET, AT, B, J,
NUL, JIS_CHAR, OTHER, JIS_C_NUM } JIS_CHAR_TYPE;
typedef enum { ASCII, A_ESC, A_ESC_DL, JIS, JIS_1, JIS_2, J_ESC, J_ESC_BR,
J2_ESC, J2_ESC_BR, DONE, INV, JIS_S_NUM } JIS_STATE;
typedef enum { COPY_A, COPY_J, COPY_J2, MAKE_A, MAKE_J, NOOP, EMPTY, ERROR } JIS_ACTION;
/**************************************************************************************
* state/action tables for processing JIS encoding
* Where possible, switches to JIS are grouped with proceding JIS characters and switches
* to ASCII are grouped with preceding JIS characters. Thus, maximum returned length
* is 2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6.
*************************************************************************************/
static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER */
/* ASCII */ { A_ESC, DONE, DONE, DONE, DONE, DONE, DONE, DONE, DONE },
/* A_ESC */ { DONE, A_ESC_DL, DONE, DONE, DONE, DONE, DONE, DONE, DONE },
/* A_ESC_DL */{ DONE, DONE, DONE, JIS, JIS, DONE, DONE, DONE, DONE },
/* JIS */ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1, INV },
/* JIS_1 */ { INV, JIS_2, JIS_2, JIS_2, JIS_2, JIS_2, INV, JIS_2, INV },
/* JIS_2 */ { J2_ESC, DONE, DONE, DONE, DONE, DONE, INV, DONE, DONE },
/* J_ESC */ { INV, INV, J_ESC_BR, INV, INV, INV, INV, INV, INV },
/* J_ESC_BR */{ INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
/* J2_ESC */ { INV, INV, J2_ESC_BR,INV, INV, INV, INV, INV, INV },
/* J2_ESC_BR*/{ INV, INV, INV, INV, DONE, DONE, INV, INV, INV },
};
static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER */
/* ASCII */ { NOOP, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, EMPTY, COPY_A, COPY_A},
/* A_ESC */ { COPY_A, NOOP, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A},
/* A_ESC_DL */{ COPY_A, COPY_A, COPY_A, MAKE_J, MAKE_J, COPY_A, COPY_A, COPY_A, COPY_A},
/* JIS */ { NOOP, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
/* JIS_1 */ { ERROR, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
/* JIS_2 */ { NOOP, COPY_J2, COPY_J2, COPY_J2, COPY_J2, COPY_J2, ERROR, COPY_J2, COPY_J2},
/* J_ESC */ { ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
/* J_ESC_BR */{ ERROR, ERROR, ERROR, ERROR, NOOP, NOOP, ERROR, ERROR, ERROR },
/* J2_ESC */ { ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
/* J2_ESC_BR*/{ ERROR, ERROR, ERROR, ERROR, COPY_J, COPY_J, ERROR, ERROR, ERROR },
};
#endif /* MB_CAPABLE */
int
_DEFUN (_mbtowc_r, (r, pwc, s, n, state),
struct _reent *r _AND
wchar_t *pwc _AND
const char *s _AND
size_t n _AND
mbstate_t *state)
{
wchar_t dummy;
unsigned char *t = (unsigned char *)s;
if (pwc == NULL)
pwc = &dummy;
if (s != NULL && n == 0)
return -2;
#ifdef MB_CAPABLE
if (r->_current_locale == NULL ||
(strlen (r->_current_locale) <= 1))
{ /* fall-through */ }
else if (!strcmp (r->_current_locale, "C-UTF-8"))
{
wchar_t char1 = 0;
if (s == NULL)
return 0; /* UTF-8 character encodings are not state-dependent */
/* we know n >= 1 if we get here */
*pwc = 0;
char1 = (wchar_t)*t;
if (char1 == '\0')
return 0; /* s points to the null character */
if (char1 >= 0x0 && char1 <= 0x7f)
{
/* single-byte sequence */
*pwc = char1;
return 1;
}
else if (char1 >= 0xc0 && char1 <= 0xdf)
{
/* two-byte sequence */
if (n >= 2)
{
wchar_t char2 = (wchar_t)*(t+1);
if (char2 < 0x80 || char2 > 0xbf)
return -1;
if (char1 < 0xc2)
/* overlong UTF-8 sequence */
return -1;
*pwc = ((char1 & 0x1f) << 6)
| (char2 & 0x3f);
return 2;
}
else
return -1;
}
else if (char1 >= 0xe0 && char1 <= 0xef)
{
/* three-byte sequence */
if (n >= 3)
{
wchar_t char2 = (wchar_t)*(t+1);
wchar_t char3 = (wchar_t)*(t+2);
if (char2 < 0x80 || char2 > 0xbf)
return -1;
if (char3 < 0x80 || char3 > 0xbf)
return -1;
if (char1 == 0xe0)
{
if (char2 < 0xa0)
/* overlong UTF-8 sequence */
return -1;
}
*pwc = ((char1 & 0x0f) << 12)
| ((char2 & 0x3f) << 6)
| (char3 & 0x3f);
if (*pwc >= 0xd800 && *pwc <= 0xdfff)
{
return -1;
}
else
return 3;
}
else
return -2;
}
else if (char1 >= 0xf0 && char1 <= 0xf7)
{
/* four-byte sequence */
if (n >= 4)
{
wchar_t char2 = (wchar_t)*(t+1);
wchar_t char3 = (wchar_t)*(t+2);
wchar_t char4 = (wchar_t)*(t+3);
if (char2 < 0x80 || char2 > 0xbf)
return -1;
if (char3 < 0x80 || char3 > 0xbf)
return -1;
if (char4 < 0x80 || char4 > 0xbf)
return -1;
if (char1 == 0xf0)
{
if (char2 < 0x90)
/* overlong UTF-8 sequence */
return -1;
}
*pwc = ((char1 & 0x07) << 18)
| ((char2 & 0x3f) << 12)
| ((char3 & 0x3f) << 6)
| (char4 & 0x3f);
return 4;
}
else
return -2;
}
else if (char1 >= 0xf8 && char1 <= 0xfb)
{
/* five-byte sequence */
if (n >= 5)
{
wchar_t char2 = (wchar_t)*(t+1);
wchar_t char3 = (wchar_t)*(t+2);
wchar_t char4 = (wchar_t)*(t+3);
wchar_t char5 = (wchar_t)*(t+4);
if (char2 < 0x80 || char2 > 0xbf)
return -1;
if (char3 < 0x80 || char3 > 0xbf)
return -1;
if (char4 < 0x80 || char4 > 0xbf)
return -1;
if (char5 < 0x80 || char5 > 0xbf)
return -1;
if (char1 == 0xf8)
{
if (char2 < 0x88)
/* overlong UTF-8 sequence */
return -1;
}
*pwc = ((char1 & 0x03) << 24)
| ((char2 & 0x3f) << 18)
| ((char3 & 0x3f) << 12)
| ((char4 & 0x3f) << 6)
| (char5 & 0x3f);
return 5;
}
else
return -2;
}
else if (char1 >= 0xfc && char1 <= 0xfd)
{
/* six-byte sequence */
if (n >= 6)
{
wchar_t char2 = (wchar_t)*(t+1);
wchar_t char3 = (wchar_t)*(t+2);
wchar_t char4 = (wchar_t)*(t+3);
wchar_t char5 = (wchar_t)*(t+4);
wchar_t char6 = (wchar_t)*(t+5);
if (char2 < 0x80 || char2 > 0xbf)
return -1;
if (char3 < 0x80 || char3 > 0xbf)
return -1;
if (char4 < 0x80 || char4 > 0xbf)
return -1;
if (char5 < 0x80 || char5 > 0xbf)
return -1;
if (char6 < 0x80 || char6 > 0xbf)
return -1;
if (char1 == 0xfc)
{
if (char2 < 0x84)
/* overlong UTF-8 sequence */
return -1;
}
*pwc = ((char1 & 0x01) << 30)
| ((char2 & 0x3f) << 24)
| ((char3 & 0x3f) << 18)
| ((char4 & 0x3f) << 12)
| ((char5 & 0x3f) << 6)
| (char6 & 0x3f);
return 6;
}
else
return -2;
}
else
return -1;
}
else if (!strcmp (r->_current_locale, "C-SJIS"))
{
int char1;
if (s == NULL)
return 0; /* not state-dependent */
char1 = *t;
if (_issjis1 (char1))
{
int char2 = t[1];
if (n <= 1)
return -2;
if (_issjis2 (char2))
{
*pwc = (((wchar_t)*t) << 8) + (wchar_t)(*(t+1));
return 2;
}
else
return -1;
}
}
else if (!strcmp (r->_current_locale, "C-EUCJP"))
{
int char1;
if (s == NULL)
return 0; /* not state-dependent */
char1 = *t;
if (_iseucjp (char1))
{
int char2 = t[1];
if (n <= 1)
return -2;
if (_iseucjp (char2))
{
*pwc = (((wchar_t)*t) << 8) + (wchar_t)(*(t+1));
return 2;
}
else
return -1;
}
}
else if (!strcmp (r->_current_locale, "C-JIS"))
{
JIS_STATE curr_state;
JIS_ACTION action;
JIS_CHAR_TYPE ch;
unsigned char *ptr;
int i, curr_ch;
if (s == NULL)
{
state->__count = 0;
return 1; /* state-dependent */
}
curr_state = (state->__count == 0 ? ASCII : JIS);
ptr = t;
for (i = 0; i < n; ++i)
{
curr_ch = t[i];
switch (curr_ch)
{
case ESC_CHAR:
ch = ESCAPE;
break;
case '$':
ch = DOLLAR;
break;
case '@':
ch = AT;
break;
case '(':
ch = BRACKET;
break;
case 'B':
ch = B;
break;
case 'J':
ch = J;
break;
case '\0':
ch = NUL;
break;
default:
if (_isjis (curr_ch))
ch = JIS_CHAR;
else
ch = OTHER;
}
action = JIS_action_table[curr_state][ch];
curr_state = JIS_state_table[curr_state][ch];
switch (action)
{
case NOOP:
break;
case EMPTY:
state->__count = 0;
*pwc = (wchar_t)0;
return i;
case COPY_A:
state->__count = 0;
*pwc = (wchar_t)*ptr;
return (i + 1);
case COPY_J:
state->__count = 0;
*pwc = (((wchar_t)*ptr) << 8) + (wchar_t)(*(ptr+1));
return (i + 1);
case COPY_J2:
state->__count = 1;
*pwc = (((wchar_t)*ptr) << 8) + (wchar_t)(*(ptr+1));
return (ptr - t) + 2;
case MAKE_A:
case MAKE_J:
ptr = (char *)(t + i + 1);
break;
case ERROR:
default:
return -1;
}
}
return -2; /* n < bytes needed */
}
#endif /* MB_CAPABLE */
/* otherwise this must be the "C" locale or unknown locale */
if (s == NULL)
return 0; /* not state-dependent */
*pwc = (wchar_t)*t;
if (*t == '\0')
return 0;
return 1;
}
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