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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [stdlib/] [mbtowc_r.c] - Blame information for rev 39

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1 39 lampret 
#include <stdlib.h>
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#include <locale.h>
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#include "mbctype.h"
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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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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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  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 = *t;
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      if (s == NULL)
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        return 0;  /* not state-dependent */
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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 = *t;
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      if (s == NULL)
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        return 0;  /* not state-dependent */
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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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  /* otherwise this must be the "C" locale or unknown locale */
194 
  if (s == NULL)
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    return 0;  /* not state-dependent */
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  *pwc = (wchar_t)*t;
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199 
  if (*t == '\0')
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    return 0;
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  return 1;
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}
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