[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.  */

/* These functions are used to manipulate multibyte characters.  */

/* 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 OTHER*/
/*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 OTHER */
/*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 },
};


char *literal_codeset = NULL;

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;
  unsigned char *t = (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)
        return 0;  /* not state-dependent */
      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)
        return 0;  /* not state-dependent */
      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;
      unsigned char *ptr;
      int i, curr_ch;
 
      if (s == NULL)
	{
	  save_state = ASCII;
	  return 1;  /* state-dependent */
	}

      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 = (char *)(t + i + 1);
              break;
            case ERROR:
            default:
              return -1;
            }
        }

      return -1;  /* n < bytes needed */
    }
               
#ifdef CROSS_COMPILE
  if (s == NULL)
    return 0;  /* not state-dependent */
  if (pwc != NULL)
    *pwc = *s;
  return 1;
#else
  /* This must be the "C" locale or unknown locale. */
  return mbtowc (pwc, s, n);
#endif
}

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

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
	21	/* These functions are used to manipulate multibyte characters. */
	22
	23	/* Note regarding cross compilation:
	24
	25	In general translation of multibyte characters to wide characters can
	26	only work in a native compiler since the translation function (mbtowc)
	27	needs to know about both the source and target character encoding. However,
	28	this particular implementation for JIS, SJIS and EUCJP source characters
	29	will work for any compiler with a newlib target. Other targets may also
	30	work provided that their wchar_t implementation is 2 bytes and the encoding
	31	leaves the source character values unchanged (except for removing the
	32	state shifting markers). */
	33
	34	#ifdef MULTIBYTE_CHARS
	35	#include "config.h"
	36	#include "system.h"
56f48ce9 DB	37	#include "mbchar.h"
	38	#include <locale.h>
	39
	40	typedef enum
	41	{
	42	ESCAPE, DOLLAR, BRACKET, AT, B, J, NUL, JIS_CHAR, OTHER, JIS_C_NUM
	43	} JIS_CHAR_TYPE;
	44
	45	typedef enum
	46	{
	47	ASCII, A_ESC, A_ESC_DL, JIS, JIS_1, JIS_2, J_ESC, J_ESC_BR,
	48	J2_ESC, J2_ESC_BR, INV, JIS_S_NUM
	49	} JIS_STATE;
	50
	51	typedef enum
	52	{
	53	COPYA, COPYJ, COPYJ2, MAKE_A, MAKE_J, NOOP, EMPTY, ERROR
	54	} JIS_ACTION;
	55
	56	/*****************************************************************************
	57	* state/action tables for processing JIS encoding
	58	* Where possible, switches to JIS are grouped with proceding JIS characters
	59	* and switches to ASCII are grouped with preceding JIS characters.
	60	* Thus, maximum returned length is:
	61	* 2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6.
	62	*****************************************************************************/
	63	static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
	64	/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER*/
	65	/ASCII/ { A_ESC, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
	66	/A_ESC/ { ASCII, A_ESC_DL,ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
	67	/A_ESC_DL/{ ASCII, ASCII, ASCII, JIS, JIS, ASCII, ASCII,ASCII,ASCII},
	68	/JIS/ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1,INV },
	69	/JIS_1/ { INV, JIS_2, JIS_2, JIS_2, JIS_2, JIS_2, INV, JIS_2,INV },
	70	/JIS_2/ { J2_ESC,JIS, JIS, JIS, JIS, JIS, INV, JIS, JIS },
	71	/J_ESC/ { INV, INV, J_ESC_BR, INV, INV, INV, INV, INV, INV },
	72	/J_ESC_BR/{ INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
	73	/J2_ESC/ { INV, INV, J2_ESC_BR,INV, INV, INV, INV, INV, INV },
	74	/J2_ESC_BR/{INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
	75	};
	76
	77	static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
	78	/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTHER */
	79	/ASCII / {NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, EMPTY, COPYA, COPYA},
	80	/A_ESC / {COPYA, NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA},
	81	/A_ESC_DL /{COPYA, COPYA, COPYA, MAKE_J, MAKE_J, COPYA, COPYA, COPYA, COPYA},
	82	/JIS / {NOOP, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
	83	/JIS_1 / {ERROR, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR },
	84	/JIS_2 / {NOOP, COPYJ2,COPYJ2,COPYJ2, COPYJ2, COPYJ2,ERROR, COPYJ2,COPYJ2},
	85	/J_ESC / {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
	86	/J_ESC_BR /{ERROR, ERROR, ERROR, ERROR, NOOP, NOOP, ERROR, ERROR, ERROR },
	87	/J2_ESC / {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR },
	88	/J2_ESC_BR/{ERROR, ERROR, ERROR, ERROR, COPYJ, COPYJ, ERROR, ERROR, ERROR },
	89	};
	90
	91
	92	char *literal_codeset = NULL;
	93
	94	int
	95	local_mbtowc (pwc, s, n)
	96	wchar_t *pwc;
	97	const char *s;
	98	size_t n;
	99	{
	100	static JIS_STATE save_state = ASCII;
101	JIS_STATE curr_state = save_state;
102	unsigned char t = (unsigned char )s;
103
104	if (s != NULL && n == 0)
105	return -1;
106
107	if (literal_codeset == NULL \|\| strlen (literal_codeset) <= 1)
108	{
109	/* This must be the "C" locale or unknown locale -- fall thru */
110	}
111	else if (! strcmp (literal_codeset, "C-SJIS"))
112	{
113	int char1;
114	if (s == NULL)
115	return 0; /* not state-dependent */
116	char1 = *t;
117	if (ISSJIS1 (char1))
118	{
119	int char2 = t[1];
120	if (n <= 1)
121	return -1;
122	if (ISSJIS2 (char2))
123	{
124	if (pwc != NULL)
125	pwc = (((wchar_t)t) << 8) + (wchar_t)(*(t+1));
126	return 2;
127	}
128	return -1;
129	}
130	if (pwc != NULL)
131	pwc = (wchar_t)t;
132	if (*t == '\0')
133	return 0;
134	return 1;
135	}
136	else if (! strcmp (literal_codeset, "C-EUCJP"))
137	{
138	int char1;
139	if (s == NULL)
140	return 0; /* not state-dependent */
141	char1 = *t;
142	if (ISEUCJP (char1))
143	{
144	int char2 = t[1];
145	if (n <= 1)
146	return -1;
147	if (ISEUCJP (char2))
148	{
149	if (pwc != NULL)
150	pwc = (((wchar_t)t) << 8) + (wchar_t)(*(t+1));
151	return 2;
152	}
153	return -1;
154	}
155	if (pwc != NULL)
156	pwc = (wchar_t)t;
157	if (*t == '\0')
158	return 0;
159	return 1;
160	}
161	else if (! strcmp (literal_codeset, "C-JIS"))
162	{
163	JIS_ACTION action;
164	JIS_CHAR_TYPE ch;
165	unsigned char *ptr;
166	int i, curr_ch;
167
168	if (s == NULL)
169	{
170	save_state = ASCII;
171	return 1; /* state-dependent */
172	}
173
174	ptr = t;
175
176	for (i = 0; i < n; ++i)
177	{
178	curr_ch = t[i];
179	switch (curr_ch)
180	{
181	case JIS_ESC_CHAR:
182	ch = ESCAPE;
183	break;
184	case '$':
185	ch = DOLLAR;
186	break;
187	case '@':
188	ch = AT;
189	break;
190	case '(':
191	ch = BRACKET;
192	break;
193	case 'B':
194	ch = B;
195	break;
196	case 'J':
197	ch = J;
198	break;
199	case '\0':
200	ch = NUL;
201	break;
202	default:
203	if (ISJIS (curr_ch))
204	ch = JIS_CHAR;
205	else
206	ch = OTHER;
207	}
208
209	action = JIS_action_table[curr_state][ch];
210	curr_state = JIS_state_table[curr_state][ch];
211
212	switch (action)
213	{
214	case NOOP:
215	break;
216	case EMPTY:
217	if (pwc != NULL)
218	*pwc = (wchar_t)0;
219	save_state = curr_state;
220	return i;
221	case COPYA:
222	if (pwc != NULL)
223	pwc = (wchar_t)ptr;
224	save_state = curr_state;
225	return (i + 1);
226	case COPYJ:
227	if (pwc != NULL)
228	pwc = (((wchar_t)ptr) << 8) + (wchar_t)(*(ptr+1));
229	save_state = curr_state;
230	return (i + 1);
231	case COPYJ2:
232	if (pwc != NULL)
233	pwc = (((wchar_t)ptr) << 8) + (wchar_t)(*(ptr+1));
234	save_state = curr_state;
235	return (ptr - t) + 2;
236	case MAKE_A:
237	case MAKE_J:
238	ptr = (char *)(t + i + 1);
239	break;
240	case ERROR:
241	default:
242	return -1;
243	}
244	}
245
246	return -1; /* n < bytes needed */
247	}
248
249	#ifdef CROSS_COMPILE
250	if (s == NULL)
251	return 0; /* not state-dependent */
252	if (pwc != NULL)
253	pwc = s;
254	return 1;
255	#else
256	/* This must be the "C" locale or unknown locale. */
257	return mbtowc (pwc, s, n);
258	#endif
259	}
260
261	int
262	local_mblen (s, n)
263	const char *s;
264	size_t n;
265	{
266	return local_mbtowc (NULL, s, n);
267	}
268
269	int
270	local_mb_cur_max ()
271	{
272	if (literal_codeset == NULL \|\| strlen (literal_codeset) <= 1)
273	;
274	else if (! strcmp (literal_codeset, "C-SJIS"))
275	return 2;
276	else if (! strcmp (literal_codeset, "C-EUCJP"))
277	return 2;
278	else if (! strcmp (literal_codeset, "C-JIS"))
279	return 8; /* 3 + 2 + 3 */
280
281	#ifdef CROSS_COMPILE
282	return 1;
283	#else
4d2a3f76 DB	284	if (MB_CUR_MAX > 0)
	285	return MB_CUR_MAX;
	286
	287	return 1; /* default */
56f48ce9 DB	288	#endif
	289	}
	290	#endif /* MULTIBYTE_CHARS */