209 lines
6.8 KiB
C
209 lines
6.8 KiB
C
#include <stdlib.h>
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#include <locale.h>
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#include "mbctype.h"
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#ifdef MB_CAPABLE
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typedef enum { ESCAPE, DOLLAR, BRACKET, AT, B, J,
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NUL, JIS_CHAR, OTHER, JIS_C_NUM } JIS_CHAR_TYPE;
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typedef enum { ASCII, A_ESC, A_ESC_DL, JIS, JIS_1, JIS_2, J_ESC, J_ESC_BR,
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J2_ESC, J2_ESC_BR, DONE, INV, JIS_S_NUM } JIS_STATE;
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typedef enum { COPY_A, COPY_J, COPY_J2, MAKE_A, MAKE_J, NOOP, EMPTY, ERROR } JIS_ACTION;
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/**************************************************************************************
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* state/action tables for processing JIS encoding
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* Where possible, switches to JIS are grouped with proceding JIS characters and switches
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* to ASCII are grouped with preceding JIS characters. Thus, maximum returned length
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* is 2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6.
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*************************************************************************************/
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static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
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/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER */
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/* ASCII */ { A_ESC, DONE, DONE, DONE, DONE, DONE, DONE, DONE, DONE },
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/* A_ESC */ { DONE, A_ESC_DL, DONE, DONE, DONE, DONE, DONE, DONE, DONE },
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/* A_ESC_DL */{ DONE, DONE, DONE, JIS, JIS, DONE, DONE, DONE, DONE },
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/* JIS */ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1, INV },
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/* JIS_1 */ { INV, JIS_2, JIS_2, JIS_2, JIS_2, JIS_2, INV, JIS_2, INV },
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/* JIS_2 */ { J2_ESC, DONE, DONE, DONE, DONE, DONE, INV, DONE, DONE },
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/* J_ESC */ { INV, INV, J_ESC_BR, INV, INV, INV, INV, INV, INV },
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/* J_ESC_BR */{ INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
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/* J2_ESC */ { INV, INV, J2_ESC_BR,INV, INV, INV, INV, INV, INV },
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/* J2_ESC_BR*/{ INV, INV, INV, INV, DONE, DONE, INV, INV, INV },
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};
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static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
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/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER */
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/* ASCII */ { NOOP, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, EMPTY, COPY_A, COPY_A},
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/* A_ESC */ { COPY_A, NOOP, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A, COPY_A},
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/* A_ESC_DL */{ COPY_A, COPY_A, COPY_A, MAKE_J, MAKE_J, COPY_A, COPY_A, COPY_A, COPY_A},
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/* JIS */ { NOOP, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
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/* JIS_1 */ { ERROR, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
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/* JIS_2 */ { NOOP, COPY_J2, COPY_J2, COPY_J2, COPY_J2, COPY_J2, ERROR, COPY_J2, COPY_J2},
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/* J_ESC */ { ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
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/* J_ESC_BR */{ ERROR, ERROR, ERROR, ERROR, NOOP, NOOP, ERROR, ERROR, ERROR },
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/* J2_ESC */ { ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
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/* J2_ESC_BR*/{ ERROR, ERROR, ERROR, ERROR, COPY_J, COPY_J, ERROR, ERROR, ERROR },
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};
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#endif /* MB_CAPABLE */
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int
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_DEFUN (_mbtowc_r, (r, pwc, s, n, state),
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struct _reent *r _AND
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wchar_t *pwc _AND
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const char *s _AND
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size_t n _AND
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int *state)
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{
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wchar_t dummy;
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unsigned char *t = (unsigned char *)s;
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if (pwc == NULL)
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pwc = &dummy;
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if (s != NULL && n == 0)
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return -1;
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#ifdef MB_CAPABLE
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if (r->_current_locale == NULL ||
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(strlen (r->_current_locale) <= 1))
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{ /* fall-through */ }
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else if (!strcmp (r->_current_locale, "C-SJIS"))
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{
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int char1;
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if (s == NULL)
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return 0; /* not state-dependent */
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char1 = *t;
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if (_issjis1 (char1))
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{
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int char2 = t[1];
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if (n <= 1)
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return -1;
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if (_issjis2 (char2))
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{
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*pwc = (((wchar_t)*t) << 8) + (wchar_t)(*(t+1));
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return 2;
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}
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else
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return -1;
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}
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}
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else if (!strcmp (r->_current_locale, "C-EUCJP"))
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{
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int char1;
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if (s == NULL)
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return 0; /* not state-dependent */
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char1 = *t;
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if (_iseucjp (char1))
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{
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int char2 = t[1];
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if (n <= 1)
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return -1;
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if (_iseucjp (char2))
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{
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*pwc = (((wchar_t)*t) << 8) + (wchar_t)(*(t+1));
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return 2;
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}
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else
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return -1;
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}
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}
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else if (!strcmp (r->_current_locale, "C-JIS"))
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{
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JIS_STATE curr_state;
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JIS_ACTION action;
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JIS_CHAR_TYPE ch;
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unsigned char *ptr;
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int i, curr_ch;
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if (s == NULL)
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{
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*state = 0;
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return 1; /* state-dependent */
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}
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curr_state = (*state == 0 ? ASCII : JIS);
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ptr = t;
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for (i = 0; i < n; ++i)
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{
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curr_ch = t[i];
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switch (curr_ch)
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{
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case ESC_CHAR:
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ch = ESCAPE;
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break;
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case '$':
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ch = DOLLAR;
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break;
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case '@':
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ch = AT;
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break;
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case '(':
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ch = BRACKET;
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break;
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case 'B':
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ch = B;
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break;
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case 'J':
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ch = J;
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break;
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case '\0':
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ch = NUL;
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break;
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default:
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if (_isjis (curr_ch))
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ch = JIS_CHAR;
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else
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ch = OTHER;
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}
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action = JIS_action_table[curr_state][ch];
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curr_state = JIS_state_table[curr_state][ch];
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switch (action)
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{
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case NOOP:
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break;
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case EMPTY:
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*state = 0;
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*pwc = (wchar_t)0;
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return i;
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case COPY_A:
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*state = 0;
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*pwc = (wchar_t)*ptr;
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return (i + 1);
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case COPY_J:
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*state = 0;
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*pwc = (((wchar_t)*ptr) << 8) + (wchar_t)(*(ptr+1));
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return (i + 1);
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case COPY_J2:
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*state = 1;
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*pwc = (((wchar_t)*ptr) << 8) + (wchar_t)(*(ptr+1));
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return (ptr - t) + 2;
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case MAKE_A:
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case MAKE_J:
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ptr = (char *)(t + i + 1);
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break;
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case ERROR:
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default:
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return -1;
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}
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}
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return -1; /* n < bytes needed */
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}
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#endif /* MB_CAPABLE */
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/* otherwise this must be the "C" locale or unknown locale */
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if (s == NULL)
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return 0; /* not state-dependent */
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*pwc = (wchar_t)*t;
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if (*t == '\0')
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return 0;
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return 1;
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}
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