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libc/newlib/libc/stdlib/mbtowc_r.c

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#include <newlib.h>
#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, JIS, A_ESC, A_ESC_DL, JIS_1, J_ESC, J_ESC_BR,
INV, JIS_S_NUM } JIS_STATE;
typedef enum { COPY_A, COPY_J1, COPY_J2, MAKE_A, 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, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII },
/* JIS */ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1, INV },
/* A_ESC */ { ASCII, A_ESC_DL, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII },
/* A_ESC_DL */{ ASCII, ASCII, ASCII, JIS, JIS, ASCII, ASCII, ASCII, ASCII },
/* JIS_1 */ { INV, JIS, JIS, JIS, JIS, JIS, INV, JIS, INV },
/* 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 },
};
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},
/* JIS */ { NOOP, COPY_J1, COPY_J1, COPY_J1, COPY_J1, COPY_J1, ERROR, COPY_J1, ERROR },
/* 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, NOOP, NOOP, COPY_A, COPY_A, COPY_A, COPY_A},
/* JIS_1 */ { ERROR, COPY_J2, COPY_J2, COPY_J2, COPY_J2, COPY_J2, ERROR, COPY_J2, ERROR },
/* J_ESC */ { ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
/* J_ESC_BR */{ ERROR, ERROR, ERROR, ERROR, MAKE_A, MAKE_A, ERROR, ERROR, ERROR },
};
#endif /* _MB_CAPABLE */
/* we override the mbstate_t __count field for more complex encodings and use it store a state value */
#define __state __count
extern char __lc_ctype[12];
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 (__lc_ctype == NULL ||
(strlen (__lc_ctype) <= 1))
{ /* fall-through */ }
else if (!strcmp (__lc_ctype, "C-UTF-8"))
{
int ch;
int i = 0;
if (s == NULL)
return 0; /* UTF-8 character encodings are not state-dependent */
if (state->__count == 0)
ch = t[i++];
else
{
++n;
ch = state->__value.__wchb[0];
}
if (ch == '\0')
{
*pwc = 0;
state->__count = 0;
return 0; /* s points to the null character */
}
if (ch >= 0x0 && ch <= 0x7f)
{
/* single-byte sequence */
state->__count = 0;
*pwc = ch;
return 1;
}
else if (ch >= 0xc0 && ch <= 0xdf)
{
/* two-byte sequence */
state->__value.__wchb[0] = ch;
state->__count = 1;
if (n < 2)
return -2;
ch = t[i++];
if (ch < 0x80 || ch > 0xbf)
return -1;
if (state->__value.__wchb[0] < 0xc2)
/* overlong UTF-8 sequence */
return -1;
state->__count = 0;
*pwc = (wchar_t)((state->__value.__wchb[0] & 0x1f) << 6)
| (wchar_t)(ch & 0x3f);
return i;
}
else if (ch >= 0xe0 && ch <= 0xef)
{
/* three-byte sequence */
wchar_t tmp;
state->__value.__wchb[0] = ch;
if (state->__count == 0)
state->__count = 1;
else
++n;
if (n < 2)
return -2;
ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1];
if (state->__value.__wchb[0] == 0xe0 && ch < 0xa0)
/* overlong UTF-8 sequence */
return -1;
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[1] = ch;
state->__count = 2;
if (n < 3)
return -2;
ch = t[i++];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__count = 0;
tmp = (wchar_t)((state->__value.__wchb[0] & 0x0f) << 12)
| (wchar_t)((state->__value.__wchb[1] & 0x3f) << 6)
| (wchar_t)(ch & 0x3f);
if (tmp >= 0xd800 && tmp <= 0xdfff)
return -1;
*pwc = tmp;
return i;
}
else if (ch >= 0xf0 && ch <= 0xf7)
{
/* four-byte sequence */
if (sizeof(wchar_t) < 4)
return -1; /* we can't store such a value */
state->__value.__wchb[0] = ch;
if (state->__count == 0)
state->__count = 1;
else
++n;
if (n < 2)
return -2;
ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1];
if (state->__value.__wchb[0] == 0xf0 && ch < 0x90)
/* overlong UTF-8 sequence */
return -1;
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[1] = ch;
if (state->__count == 1)
state->__count = 2;
else
++n;
if (n < 3)
return -2;
ch = (state->__count == 2) ? t[i++] : state->__value.__wchb[2];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[2] = ch;
state->__count = 3;
if (n < 4)
return -2;
ch = t[i++];
if (ch < 0x80 || ch > 0xbf)
return -1;
*pwc = (wchar_t)((state->__value.__wchb[0] & 0x07) << 18)
| (wchar_t)((state->__value.__wchb[1] & 0x3f) << 12)
| (wchar_t)((state->__value.__wchb[2] & 0x3f) << 6)
| (wchar_t)(ch & 0x3f);
state->__count = 0;
return i;
}
else if (ch >= 0xf8 && ch <= 0xfb)
{
/* five-byte sequence */
if (sizeof(wchar_t) < 4)
return -1; /* we can't store such a value */
state->__value.__wchb[0] = ch;
if (state->__count == 0)
state->__count = 1;
else
++n;
if (n < 2)
return -2;
ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1];
if (state->__value.__wchb[0] == 0xf8 && ch < 0x88)
/* overlong UTF-8 sequence */
return -1;
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[1] = ch;
if (state->__count == 1)
state->__count = 2;
else
++n;
if (n < 3)
return -2;
ch = (state->__count == 2) ? t[i++] : state->__value.__wchb[2];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[2] = ch;
if (state->__count == 2)
state->__count = 3;
else
++n;
if (n < 4)
return -2;
ch = (state->__count == 3) ? t[i++] : state->__value.__wchb[3];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[3] = ch;
state->__count = 4;
if (n < 5)
return -2;
ch = t[i++];
*pwc = (wchar_t)((state->__value.__wchb[0] & 0x03) << 24)
| (wchar_t)((state->__value.__wchb[1] & 0x3f) << 18)
| (wchar_t)((state->__value.__wchb[2] & 0x3f) << 12)
| (wchar_t)((state->__value.__wchb[3] & 0x3f) << 6)
| (wchar_t)(ch & 0x3f);
state->__count = 0;
return i;
}
else if (ch >= 0xfc && ch <= 0xfd)
{
/* six-byte sequence */
int ch2;
if (sizeof(wchar_t) < 4)
return -1; /* we can't store such a value */
state->__value.__wchb[0] = ch;
if (state->__count == 0)
state->__count = 1;
else
++n;
if (n < 2)
return -2;
ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1];
if (state->__value.__wchb[0] == 0xfc && ch < 0x84)
/* overlong UTF-8 sequence */
return -1;
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[1] = ch;
if (state->__count == 1)
state->__count = 2;
else
++n;
if (n < 3)
return -2;
ch = (state->__count == 2) ? t[i++] : state->__value.__wchb[2];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[2] = ch;
if (state->__count == 2)
state->__count = 3;
else
++n;
if (n < 4)
return -2;
ch = (state->__count == 3) ? t[i++] : state->__value.__wchb[3];
if (ch < 0x80 || ch > 0xbf)
return -1;
state->__value.__wchb[3] = ch;
if (state->__count == 3)
state->__count = 4;
else
++n;
if (n < 5)
return -2;
if (n == 5)
return -1; /* at this point we can't save enough to restart */
ch = t[i++];
if (ch < 0x80 || ch > 0xbf)
return -1;
ch2 = t[i++];
*pwc = (wchar_t)((state->__value.__wchb[0] & 0x01) << 30)
| (wchar_t)((state->__value.__wchb[1] & 0x3f) << 24)
| (wchar_t)((state->__value.__wchb[2] & 0x3f) << 18)
| (wchar_t)((state->__value.__wchb[3] & 0x3f) << 12)
| (wchar_t)((ch & 0x3f) << 6)
| (wchar_t)(ch2 & 0x3f);
state->__count = 0;
return i;
}
else
return -1;
}
else if (!strcmp (__lc_ctype, "C-SJIS"))
{
int ch;
int i = 0;
if (s == NULL)
return 0; /* not state-dependent */
ch = t[i++];
if (state->__count == 0)
{
if (_issjis1 (ch))
{
state->__value.__wchb[0] = ch;
state->__count = 1;
if (n <= 1)
return -2;
ch = t[i++];
}
}
if (state->__count == 1)
{
if (_issjis2 (ch))
{
*pwc = (((wchar_t)state->__value.__wchb[0]) << 8) + (wchar_t)ch;
state->__count = 0;
return i;
}
else
return -1;
}
}
else if (!strcmp (__lc_ctype, "C-EUCJP"))
{
int ch;
int i = 0;
if (s == NULL)
return 0; /* not state-dependent */
ch = t[i++];
if (state->__count == 0)
{
if (_iseucjp (ch))
{
state->__value.__wchb[0] = ch;
state->__count = 1;
if (n <= 1)
return -2;
ch = t[i++];
}
}
if (state->__count == 1)
{
if (_iseucjp (ch))
{
*pwc = (((wchar_t)state->__value.__wchb[0]) << 8) + (wchar_t)ch;
state->__count = 0;
return i;
}
else
return -1;
}
}
else if (!strcmp (__lc_ctype, "C-JIS"))
{
JIS_STATE curr_state;
JIS_ACTION action;
JIS_CHAR_TYPE ch;
unsigned char *ptr;
unsigned int i;
int curr_ch;
if (s == NULL)
{
state->__state = ASCII;
return 1; /* state-dependent */
}
curr_state = state->__state;
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->__state = ASCII;
*pwc = (wchar_t)0;
return 0;
case COPY_A:
state->__state = ASCII;
*pwc = (wchar_t)*ptr;
return (i + 1);
case COPY_J1:
state->__value.__wchb[0] = t[i];
break;
case COPY_J2:
state->__state = JIS;
*pwc = (((wchar_t)state->__value.__wchb[0]) << 8) + (wchar_t)(t[i]);
return (i + 1);
case MAKE_A:
ptr = (char *)(t + i + 1);
break;
case ERROR:
default:
return -1;
}
}
state->__state = curr_state;
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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