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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [mbtowc_r.c] - Rev 301
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#include <newlib.h> #include <stdlib.h> #include <locale.h> #include "mbctype.h" #include <wchar.h> #include <string.h> #include <errno.h> #include "local.h" int (*__mbtowc) (struct _reent *, wchar_t *, const char *, size_t, const char *, mbstate_t *) #ifdef __CYGWIN__ = __utf8_mbtowc; #else = __ascii_mbtowc; #endif 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) { return __mbtowc (r, pwc, s, n, __locale_charset (), state); } int _DEFUN (__ascii_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; if (n == 0) return -2; *pwc = (wchar_t)*t; if (*t == '\0') return 0; return 1; } #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 }, }; /* we override the mbstate_t __count field for more complex encodings and use it store a state value */ #define __state __count #ifdef _MB_EXTENDED_CHARSETS_ISO int _DEFUN (__iso_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; if (n == 0) return -2; if (*t >= 0xa0) { int iso_idx = __iso_8859_index (charset + 9); if (iso_idx >= 0) { *pwc = __iso_8859_conv[iso_idx][*t - 0xa0]; if (*pwc == 0) /* Invalid character */ { r->_errno = EILSEQ; return -1; } return 1; } } *pwc = (wchar_t) *t; if (*t == '\0') return 0; return 1; } #endif /* _MB_EXTENDED_CHARSETS_ISO */ #ifdef _MB_EXTENDED_CHARSETS_WINDOWS int _DEFUN (__cp_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; if (n == 0) return -2; if (*t >= 0x80) { int cp_idx = __cp_index (charset + 2); if (cp_idx >= 0) { *pwc = __cp_conv[cp_idx][*t - 0x80]; if (*pwc == 0) /* Invalid character */ { r->_errno = EILSEQ; return -1; } return 1; } } *pwc = (wchar_t)*t; if (*t == '\0') return 0; return 1; } #endif /* _MB_EXTENDED_CHARSETS_WINDOWS */ int _DEFUN (__utf8_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; int ch; int i = 0; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; if (n == 0) return -2; if (state->__count == 0) ch = t[i++]; else ch = state->__value.__wchb[0]; if (ch == '\0') { *pwc = 0; state->__count = 0; return 0; /* s points to the null character */ } if (ch <= 0x7f) { /* single-byte sequence */ state->__count = 0; *pwc = ch; return 1; } if (ch >= 0xc0 && ch <= 0xdf) { /* two-byte sequence */ state->__value.__wchb[0] = ch; if (state->__count == 0) state->__count = 1; else if (n < (size_t)-1) ++n; if (n < 2) return -2; ch = t[i++]; if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; return -1; } if (state->__value.__wchb[0] < 0xc2) { /* overlong UTF-8 sequence */ r->_errno = EILSEQ; return -1; } state->__count = 0; *pwc = (wchar_t)((state->__value.__wchb[0] & 0x1f) << 6) | (wchar_t)(ch & 0x3f); return i; } if (ch >= 0xe0 && ch <= 0xef) { /* three-byte sequence */ wchar_t tmp; state->__value.__wchb[0] = ch; if (state->__count == 0) state->__count = 1; else if (n < (size_t)-1) ++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 */ r->_errno = EILSEQ; return -1; } if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; return -1; } state->__value.__wchb[1] = ch; if (state->__count == 1) state->__count = 2; else if (n < (size_t)-1) ++n; if (n < 3) return -2; ch = t[i++]; if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; 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); *pwc = tmp; return i; } if (ch >= 0xf0 && ch <= 0xf4) { /* four-byte sequence */ wint_t tmp; state->__value.__wchb[0] = ch; if (state->__count == 0) state->__count = 1; else if (n < (size_t)-1) ++n; if (n < 2) return -2; ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1]; if ((state->__value.__wchb[0] == 0xf0 && ch < 0x90) || (state->__value.__wchb[0] == 0xf4 && ch >= 0x90)) { /* overlong UTF-8 sequence or result is > 0x10ffff */ r->_errno = EILSEQ; return -1; } if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; return -1; } state->__value.__wchb[1] = ch; if (state->__count == 1) state->__count = 2; else if (n < (size_t)-1) ++n; if (n < 3) return -2; ch = (state->__count == 2) ? t[i++] : state->__value.__wchb[2]; if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; return -1; } state->__value.__wchb[2] = ch; if (state->__count == 2) state->__count = 3; else if (n < (size_t)-1) ++n; if (state->__count == 3 && sizeof(wchar_t) == 2) { /* On systems which have wchar_t being UTF-16 values, the value doesn't fit into a single wchar_t in this case. So what we do here is to store the state with a special value of __count and return the first half of a surrogate pair. The first three bytes of a UTF-8 sequence are enough to generate the first half of a UTF-16 surrogate pair. As return value we choose to return the number of bytes actually read up to here. The second half of the surrogate pair is returned in case we recognize the special __count value of four, and the next byte is actually a valid value. See below. */ tmp = (wint_t)((state->__value.__wchb[0] & 0x07) << 18) | (wint_t)((state->__value.__wchb[1] & 0x3f) << 12) | (wint_t)((state->__value.__wchb[2] & 0x3f) << 6); state->__count = 4; *pwc = 0xd800 | ((tmp - 0x10000) >> 10); return i; } if (n < 4) return -2; ch = t[i++]; if (ch < 0x80 || ch > 0xbf) { r->_errno = EILSEQ; return -1; } tmp = (wint_t)((state->__value.__wchb[0] & 0x07) << 18) | (wint_t)((state->__value.__wchb[1] & 0x3f) << 12) | (wint_t)((state->__value.__wchb[2] & 0x3f) << 6) | (wint_t)(ch & 0x3f); if (state->__count == 4 && sizeof(wchar_t) == 2) /* Create the second half of the surrogate pair for systems with wchar_t == UTF-16 . */ *pwc = 0xdc00 | (tmp & 0x3ff); else *pwc = tmp; state->__count = 0; return i; } r->_errno = EILSEQ; return -1; } /* Cygwin defines its own doublebyte charset conversion functions because the underlying OS requires wchar_t == UTF-16. */ #ifndef __CYGWIN__ int _DEFUN (__sjis_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; int ch; int i = 0; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; /* not state-dependent */ if (n == 0) return -2; 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 { r->_errno = EILSEQ; return -1; } } *pwc = (wchar_t)*t; if (*t == '\0') return 0; return 1; } int _DEFUN (__eucjp_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; int ch; int i = 0; if (pwc == NULL) pwc = &dummy; if (s == NULL) return 0; if (n == 0) return -2; ch = t[i++]; if (state->__count == 0) { if (_iseucjp1 (ch)) { state->__value.__wchb[0] = ch; state->__count = 1; if (n <= 1) return -2; ch = t[i++]; } } if (state->__count == 1) { if (_iseucjp2 (ch)) { if (state->__value.__wchb[0] == 0x8f) { state->__value.__wchb[1] = ch; state->__count = 2; if (n <= i) return -2; ch = t[i++]; } else { *pwc = (((wchar_t)state->__value.__wchb[0]) << 8) + (wchar_t)ch; state->__count = 0; return i; } } else { r->_errno = EILSEQ; return -1; } } if (state->__count == 2) { if (_iseucjp2 (ch)) { *pwc = (((wchar_t)state->__value.__wchb[1]) << 8) + (wchar_t)(ch & 0x7f); state->__count = 0; return i; } else { r->_errno = EILSEQ; return -1; } } *pwc = (wchar_t)*t; if (*t == '\0') return 0; return 1; } int _DEFUN (__jis_mbtowc, (r, pwc, s, n, charset, state), struct _reent *r _AND wchar_t *pwc _AND const char *s _AND size_t n _AND const char *charset _AND mbstate_t *state) { wchar_t dummy; unsigned char *t = (unsigned char *)s; JIS_STATE curr_state; JIS_ACTION action; JIS_CHAR_TYPE ch; unsigned char *ptr; unsigned int i; int curr_ch; if (pwc == NULL) pwc = &dummy; if (s == NULL) { state->__state = ASCII; return 1; /* state-dependent */ } if (n == 0) return -2; 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 = (unsigned char *)(t + i + 1); break; case ERROR: default: r->_errno = EILSEQ; return -1; } } state->__state = curr_state; return -2; /* n < bytes needed */ } #endif /* !__CYGWIN__*/ #endif /* _MB_CAPABLE */
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