[thirdparty/gcc.git] / gcc / mbchar.c

/* Multibyte Character Functions.
   Copyright (C) 1998 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Note regarding cross compilation:

   In general, translation of multibyte characters to wide characters can
   only work in a native compiler since the translation function (mbtowc)
   needs to know about both the source and target character encoding.  However,
   this particular implementation for JIS, SJIS and EUCJP source characters
   will work for any compiler with a newlib target.  Other targets may also
   work provided that their wchar_t implementation is 2 bytes and the encoding
   leaves the source character values unchanged (except for removing the
   state shifting markers).  */

#ifdef MULTIBYTE_CHARS
#include "config.h"
#include "system.h"
#include "mbchar.h"
#include <locale.h>

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, INV, JIS_S_NUM} JIS_STATE; 

typedef enum {COPYA, COPYJ, COPYJ2, 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 OTH*/
/*ASCII*/   { A_ESC, ASCII,   ASCII,    ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
/*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*/     { 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,JIS,     JIS,      JIS,   JIS,   JIS,   INV,  JIS,  JIS },
/*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,   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 OTH */
/*ASCII */   {NOOP,  COPYA, COPYA, COPYA,  COPYA,  COPYA, EMPTY, COPYA, COPYA},
/*A_ESC */   {COPYA, NOOP,  COPYA, COPYA,  COPYA,  COPYA, COPYA, COPYA, COPYA},
/*A_ESC_DL */{COPYA, COPYA, COPYA, MAKE_J, MAKE_J, COPYA, COPYA, COPYA, COPYA},
/*JIS */     {NOOP,  NOOP,  NOOP,  NOOP,   NOOP,   NOOP,  ERROR, NOOP,  ERROR},
/*JIS_1 */   {ERROR, NOOP,  NOOP,  NOOP,   NOOP,   NOOP,  ERROR, NOOP,  ERROR},
/*JIS_2 */   {NOOP,  COPYJ2,COPYJ2,COPYJ2, COPYJ2, COPYJ2,ERROR, COPYJ2,COPYJ2},
/*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,  COPYJ,  COPYJ, ERROR, ERROR, ERROR},
};


const char *literal_codeset = NULL;

/* Store into *PWC (if PWC is not null) the wide character
   corresponding to the multibyte character at the start of the
   buffer S of size N.  Return the number of bytes in the multibyte
   character.  Return -1 if the bytes do not form a valid character,
   or 0 if S is null or points to a null byte.

   This function behaves like the Standard C function mbtowc, except
   it treats locale names of the form "C-..." specially.  */

int
local_mbtowc (pwc, s, n)
     wchar_t *pwc;
     const char *s;
     size_t n;
{
  static JIS_STATE save_state = ASCII;
  JIS_STATE curr_state = save_state;
  const unsigned char *t = (const unsigned char *) s;

  if (s != NULL && n == 0)
    return -1;

  if (literal_codeset == NULL || strlen (literal_codeset) <= 1)
    /* This must be the "C" locale or unknown locale -- fall thru */
    ;
  else if (! strcmp (literal_codeset, "C-SJIS"))
    {
      int char1;
      if (s == NULL)
	/* Not state-dependent.  */
        return 0;

      char1 = *t;
      if (ISSJIS1 (char1))
        {
          int char2 = t[1];

          if (n <= 1)
            return -1;

          if (ISSJIS2 (char2))
            {
	      if (pwc != NULL)
		*pwc = (((wchar_t) *t) << 8) + (wchar_t) (*(t + 1));
              return 2;
            }

	  return -1;
        }

      if (pwc != NULL)
	*pwc = (wchar_t) *t;

      if (*t == '\0')
	return 0;

      return 1;
    }
  else if (! strcmp (literal_codeset, "C-EUCJP"))
    {
      int char1;

      if (s == NULL)
	/* Not state-dependent.  */
        return 0;

      char1 = *t;
      if (ISEUCJP (char1))
        {
          int char2 = t[1];     

          if (n <= 1)
            return -1;

          if (ISEUCJP (char2))
            {
	      if (pwc != NULL)
		*pwc = (((wchar_t) *t) << 8) + (wchar_t) (*(t + 1));
              return 2;
            }

	  return -1;
        }

      if (pwc != NULL)
	*pwc = (wchar_t) *t;

      if (*t == '\0')
	return 0;

      return 1;
    }
  else if (! strcmp (literal_codeset, "C-JIS"))
    {
      JIS_ACTION action;
      JIS_CHAR_TYPE ch;
      const unsigned char *ptr;
      size_t i, curr_ch;
 
      if (s == NULL)
	{
	  save_state = ASCII;
	  /* State-dependent. */
	  return 1;
	}

      ptr = t;

      for (i = 0; i < n; i++)
        {
          curr_ch = t[i];
          switch (curr_ch)
            {
	    case JIS_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:
	      if (pwc != NULL)
		*pwc = (wchar_t) 0;

	      save_state = curr_state;
              return i;

            case COPYA:
	      if (pwc != NULL)
		*pwc = (wchar_t) *ptr;
	      save_state = curr_state;
              return i + 1;

            case COPYJ:
	      if (pwc != NULL)
		*pwc = (((wchar_t) *ptr) << 8) + (wchar_t) (*(ptr + 1));

	      save_state = curr_state;
              return i + 1;

            case COPYJ2:
	      if (pwc != NULL)
		*pwc = (((wchar_t) *ptr) << 8) + (wchar_t) (*(ptr + 1));

	      save_state = curr_state;
              return ptr - t + 2;

            case MAKE_A:
            case MAKE_J:
              ptr = (const unsigned char *) (t + i + 1);
              break;

            case ERROR:
            default:
              return -1;
            }
        }

      /* More than n bytes needed.  */
      return -1;  
    }
               
#ifdef CROSS_COMPILE
  if (s == NULL)
    /* Not state-dependent.  */
    return 0;

  if (pwc != NULL)
    *pwc = *s;
  return 1;
#else

  /* This must be the "C" locale or unknown locale. */
  return mbtowc (pwc, s, n);
#endif
}

/* Return the number of bytes in the multibyte character at the start
   of the buffer S of size N.  Return -1 if the bytes do not form a
   valid character, or 0 if S is null or points to a null byte.

   This function behaves like the Standard C function mblen, except
   it treats locale names of the form "C-..." specially.  */

int
local_mblen (s, n)
     const char *s;
     size_t n;
{
  return local_mbtowc (NULL, s, n);
}

/* Return the maximum mumber of bytes in a multibyte character.

   This function returns the same value as the Standard C macro MB_CUR_MAX,
   except it treats locale names of the form "C-..." specially.  */

int
local_mb_cur_max ()
{
  if (literal_codeset == NULL || strlen (literal_codeset) <= 1)
    ;
  else if (! strcmp (literal_codeset, "C-SJIS"))
    return 2;
  else if (! strcmp (literal_codeset, "C-EUCJP"))
    return 2;
  else if (! strcmp (literal_codeset, "C-JIS"))
    return 8; /* 3 + 2 + 3 */

#ifdef CROSS_COMPILE
  return 1;
#else
  if (MB_CUR_MAX > 0)
    return MB_CUR_MAX;

  return 1; /* default */
#endif
}
#endif /* MULTIBYTE_CHARS */
Commit	Line	Data
56f48ce9 DB	1	/* Multibyte Character Functions.
	2	Copyright (C) 1998 Free Software Foundation, Inc.
	3
	4	This file is part of GNU CC.
	5
	6	GNU CC is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2, or (at your option)
	9	any later version.
	10
	11	GNU CC is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU CC; see the file COPYING. If not, write to
	18	the Free Software Foundation, 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
	20
56f48ce9 DB	21	/* Note regarding cross compilation:
56f48ce9 DB	22
c5c76735	23	In general, translation of multibyte characters to wide characters can
56f48ce9 DB	24	only work in a native compiler since the translation function (mbtowc)
	25	needs to know about both the source and target character encoding. However,
	26	this particular implementation for JIS, SJIS and EUCJP source characters
	27	will work for any compiler with a newlib target. Other targets may also
	28	work provided that their wchar_t implementation is 2 bytes and the encoding
	29	leaves the source character values unchanged (except for removing the
	30	state shifting markers). */
	31
	32	#ifdef MULTIBYTE_CHARS
	33	#include "config.h"
	34	#include "system.h"
56f48ce9 DB	35	#include "mbchar.h"
	36	#include <locale.h>
	37
c5c76735 JL	38	typedef enum {ESCAPE, DOLLAR, BRACKET, AT, B, J, NUL, JIS_CHAR, OTHER,
c5c76735 JL	39	JIS_C_NUM} JIS_CHAR_TYPE;
56f48ce9	40
c5c76735 JL	41	typedef enum {ASCII, A_ESC, A_ESC_DL, JIS, JIS_1, JIS_2, J_ESC, J_ESC_BR,
	42	J2_ESC, J2_ESC_BR, INV, JIS_S_NUM} JIS_STATE;
	43
	44	typedef enum {COPYA, COPYJ, COPYJ2, MAKE_A, MAKE_J, NOOP,
	45	EMPTY, ERROR} JIS_ACTION;
	46
	47	/* State/action tables for processing JIS encoding:
	48
	49	Where possible, switches to JIS are grouped with proceding JIS characters
	50	and switches to ASCII are grouped with preceding JIS characters.
	51	Thus, maximum returned length is:
	52	2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6. */
56f48ce9	53
56f48ce9	54	static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
c5c76735	55	/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTH*/
56f48ce9 DB	56	/ASCII/ { A_ESC, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
	57	/A_ESC/ { ASCII, A_ESC_DL,ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
	58	/A_ESC_DL/{ ASCII, ASCII, ASCII, JIS, JIS, ASCII, ASCII,ASCII,ASCII},
	59	/JIS/ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1,INV },
	60	/JIS_1/ { INV, JIS_2, JIS_2, JIS_2, JIS_2, JIS_2, INV, JIS_2,INV },
	61	/JIS_2/ { J2_ESC,JIS, JIS, JIS, JIS, JIS, INV, JIS, JIS },
	62	/J_ESC/ { INV, INV, J_ESC_BR, INV, INV, INV, INV, INV, INV },
	63	/J_ESC_BR/{ INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
	64	/J2_ESC/ { INV, INV, J2_ESC_BR,INV, INV, INV, INV, INV, INV },
	65	/J2_ESC_BR/{INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
	66	};
	67
	68	static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
c5c76735	69	/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTH */
56f48ce9 DB	70	/ASCII / {NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, EMPTY, COPYA, COPYA},
	71	/A_ESC / {COPYA, NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA},
	72	/A_ESC_DL /{COPYA, COPYA, COPYA, MAKE_J, MAKE_J, COPYA, COPYA, COPYA, COPYA},
c5c76735 JL	73	/JIS / {NOOP, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR},
c5c76735 JL	74	/JIS_1 / {ERROR, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR},
56f48ce9	75	/JIS_2 / {NOOP, COPYJ2,COPYJ2,COPYJ2, COPYJ2, COPYJ2,ERROR, COPYJ2,COPYJ2},
c5c76735 JL	76	/J_ESC / {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR},
	77	/J_ESC_BR /{ERROR, ERROR, ERROR, ERROR, NOOP, NOOP, ERROR, ERROR, ERROR},
	78	/J2_ESC / {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR},
	79	/J2_ESC_BR/{ERROR, ERROR, ERROR, ERROR, COPYJ, COPYJ, ERROR, ERROR, ERROR},
56f48ce9 DB	80	};
	81
	82
5da1ecf2	83	const char *literal_codeset = NULL;
56f48ce9	84
c5c76735 JL	85	/* Store into *PWC (if PWC is not null) the wide character
	86	corresponding to the multibyte character at the start of the
	87	buffer S of size N. Return the number of bytes in the multibyte
	88	character. Return -1 if the bytes do not form a valid character,
	89	or 0 if S is null or points to a null byte.
	90
	91	This function behaves like the Standard C function mbtowc, except
	92	it treats locale names of the form "C-..." specially. */
	93
56f48ce9 DB	94	int
56f48ce9 DB	95	local_mbtowc (pwc, s, n)
c5c76735	96	wchar_t *pwc;
5da1ecf2	97	const char *s;
c5c76735	98	size_t n;
56f48ce9 DB	99	{
	100	static JIS_STATE save_state = ASCII;
	101	JIS_STATE curr_state = save_state;
5da1ecf2	102	const unsigned char t = (const unsigned char ) s;
56f48ce9 DB	103
	104	if (s != NULL && n == 0)
	105	return -1;
	106
	107	if (literal_codeset == NULL \|\| strlen (literal_codeset) <= 1)
c5c76735 JL	108	/* This must be the "C" locale or unknown locale -- fall thru */
c5c76735 JL	109	;
56f48ce9 DB	110	else if (! strcmp (literal_codeset, "C-SJIS"))
	111	{
	112	int char1;
	113	if (s == NULL)
c5c76735 JL	114	/* Not state-dependent. */
	115	return 0;
	116
56f48ce9 DB	117	char1 = *t;
	118	if (ISSJIS1 (char1))
	119	{
	120	int char2 = t[1];
c5c76735	121
56f48ce9 DB	122	if (n <= 1)
56f48ce9 DB	123	return -1;
c5c76735	124
56f48ce9 DB	125	if (ISSJIS2 (char2))
	126	{
	127	if (pwc != NULL)
c5c76735	128	pwc = (((wchar_t) t) << 8) + (wchar_t) (*(t + 1));
56f48ce9 DB	129	return 2;
56f48ce9 DB	130	}
c5c76735	131
56f48ce9 DB	132	return -1;
56f48ce9 DB	133	}
c5c76735	134
56f48ce9	135	if (pwc != NULL)
c5c76735 JL	136	pwc = (wchar_t) t;
c5c76735 JL	137
56f48ce9 DB	138	if (*t == '\0')
56f48ce9 DB	139	return 0;
c5c76735	140
56f48ce9 DB	141	return 1;
	142	}
	143	else if (! strcmp (literal_codeset, "C-EUCJP"))
	144	{
	145	int char1;
c5c76735	146
56f48ce9	147	if (s == NULL)
c5c76735 JL	148	/* Not state-dependent. */
	149	return 0;
	150
56f48ce9 DB	151	char1 = *t;
	152	if (ISEUCJP (char1))
	153	{
	154	int char2 = t[1];
c5c76735	155
56f48ce9 DB	156	if (n <= 1)
56f48ce9 DB	157	return -1;
c5c76735	158
56f48ce9 DB	159	if (ISEUCJP (char2))
	160	{
	161	if (pwc != NULL)
c5c76735	162	pwc = (((wchar_t) t) << 8) + (wchar_t) (*(t + 1));
56f48ce9 DB	163	return 2;
56f48ce9 DB	164	}
c5c76735	165
56f48ce9 DB	166	return -1;
56f48ce9 DB	167	}
c5c76735	168
56f48ce9	169	if (pwc != NULL)
c5c76735 JL	170	pwc = (wchar_t) t;
c5c76735 JL	171
56f48ce9 DB	172	if (*t == '\0')
56f48ce9 DB	173	return 0;
c5c76735	174
56f48ce9 DB	175	return 1;
	176	}
	177	else if (! strcmp (literal_codeset, "C-JIS"))
	178	{
	179	JIS_ACTION action;
	180	JIS_CHAR_TYPE ch;
5da1ecf2 KG	181	const unsigned char *ptr;
5da1ecf2 KG	182	size_t i, curr_ch;
56f48ce9 DB	183
	184	if (s == NULL)
	185	{
	186	save_state = ASCII;
c5c76735 JL	187	/* State-dependent. */
c5c76735 JL	188	return 1;
56f48ce9 DB	189	}
	190
	191	ptr = t;
	192
c5c76735	193	for (i = 0; i < n; i++)
56f48ce9 DB	194	{
	195	curr_ch = t[i];
	196	switch (curr_ch)
	197	{
	198	case JIS_ESC_CHAR:
	199	ch = ESCAPE;
	200	break;
	201	case '$':
	202	ch = DOLLAR;
	203	break;
	204	case '@':
	205	ch = AT;
	206	break;
	207	case '(':
	208	ch = BRACKET;
	209	break;
	210	case 'B':
	211	ch = B;
	212	break;
	213	case 'J':
	214	ch = J;
	215	break;
	216	case '\0':
	217	ch = NUL;
	218	break;
	219	default:
	220	if (ISJIS (curr_ch))
	221	ch = JIS_CHAR;
	222	else
	223	ch = OTHER;
	224	}
	225
	226	action = JIS_action_table[curr_state][ch];
	227	curr_state = JIS_state_table[curr_state][ch];
	228
	229	switch (action)
	230	{
	231	case NOOP:
	232	break;
c5c76735	233
56f48ce9 DB	234	case EMPTY:
56f48ce9 DB	235	if (pwc != NULL)
c5c76735 JL	236	*pwc = (wchar_t) 0;
c5c76735 JL	237
56f48ce9 DB	238	save_state = curr_state;
56f48ce9 DB	239	return i;
c5c76735	240
56f48ce9 DB	241	case COPYA:
56f48ce9 DB	242	if (pwc != NULL)
c5c76735	243	pwc = (wchar_t) ptr;
56f48ce9	244	save_state = curr_state;
c5c76735 JL	245	return i + 1;
c5c76735 JL	246
56f48ce9 DB	247	case COPYJ:
56f48ce9 DB	248	if (pwc != NULL)
c5c76735 JL	249	pwc = (((wchar_t) ptr) << 8) + (wchar_t) (*(ptr + 1));
c5c76735 JL	250
56f48ce9	251	save_state = curr_state;
c5c76735 JL	252	return i + 1;
c5c76735 JL	253
56f48ce9 DB	254	case COPYJ2:
56f48ce9 DB	255	if (pwc != NULL)
c5c76735 JL	256	pwc = (((wchar_t) ptr) << 8) + (wchar_t) (*(ptr + 1));
c5c76735 JL	257
56f48ce9	258	save_state = curr_state;
c5c76735 JL	259	return ptr - t + 2;
c5c76735 JL	260
56f48ce9 DB	261	case MAKE_A:
56f48ce9 DB	262	case MAKE_J:
5da1ecf2	263	ptr = (const unsigned char *) (t + i + 1);
56f48ce9	264	break;
c5c76735	265
56f48ce9 DB	266	case ERROR:
	267	default:
	268	return -1;
	269	}
	270	}
	271
c5c76735 JL	272	/* More than n bytes needed. */
c5c76735 JL	273	return -1;
56f48ce9 DB	274	}
	275
	276	#ifdef CROSS_COMPILE
	277	if (s == NULL)
c5c76735 JL	278	/* Not state-dependent. */
	279	return 0;
	280
56f48ce9 DB	281	if (pwc != NULL)
	282	pwc = s;
	283	return 1;
	284	#else
c5c76735	285
56f48ce9 DB	286	/* This must be the "C" locale or unknown locale. */
	287	return mbtowc (pwc, s, n);
	288	#endif
	289	}
	290
c5c76735 JL	291	/* Return the number of bytes in the multibyte character at the start
	292	of the buffer S of size N. Return -1 if the bytes do not form a
	293	valid character, or 0 if S is null or points to a null byte.
	294
	295	This function behaves like the Standard C function mblen, except
	296	it treats locale names of the form "C-..." specially. */
	297
56f48ce9 DB	298	int
56f48ce9 DB	299	local_mblen (s, n)
5da1ecf2	300	const char *s;
c5c76735	301	size_t n;
56f48ce9 DB	302	{
	303	return local_mbtowc (NULL, s, n);
	304	}
	305
c5c76735 JL	306	/* Return the maximum mumber of bytes in a multibyte character.
	307
	308	This function returns the same value as the Standard C macro MB_CUR_MAX,
	309	except it treats locale names of the form "C-..." specially. */
	310
56f48ce9 DB	311	int
	312	local_mb_cur_max ()
	313	{
	314	if (literal_codeset == NULL \|\| strlen (literal_codeset) <= 1)
	315	;
	316	else if (! strcmp (literal_codeset, "C-SJIS"))
	317	return 2;
	318	else if (! strcmp (literal_codeset, "C-EUCJP"))
	319	return 2;
	320	else if (! strcmp (literal_codeset, "C-JIS"))
	321	return 8; /* 3 + 2 + 3 */
	322
	323	#ifdef CROSS_COMPILE
	324	return 1;
	325	#else
4d2a3f76 DB	326	if (MB_CUR_MAX > 0)
	327	return MB_CUR_MAX;
	328
	329	return 1; /* default */
56f48ce9 DB	330	#endif
	331	}
	332	#endif /* MULTIBYTE_CHARS */