text: /* Conversion from and to IBM933.
     Copyright (C) 2000-2015 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library 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
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <dlfcn.h>
  #include <stdint.h>
  #include <wchar.h>
  #include <byteswap.h>
  #include "ibm933.h"
  
  /* The shift sequences for this charset (it does not use ESC).  */
  #define SI 		0x0F  /* Shift In, host code to turn DBCS off.  */
  #define SO 		0x0E  /* Shift Out, host code to turn DBCS on.  */
  
  /* Definitions used in the body of the `gconv' function.  */
  #define CHARSET_NAME	"IBM933//"
  #define FROM_LOOP	from_ibm933
  #define TO_LOOP		to_ibm933
  #define ONE_DIRECTION			0
  #define FROM_LOOP_MIN_NEEDED_FROM	1
  #define FROM_LOOP_MAX_NEEDED_FROM	2
  #define FROM_LOOP_MIN_NEEDED_TO		4
  #define FROM_LOOP_MAX_NEEDED_TO		4
  #define TO_LOOP_MIN_NEEDED_FROM		4
  #define TO_LOOP_MAX_NEEDED_FROM		4
  #define TO_LOOP_MIN_NEEDED_TO		1
  #define TO_LOOP_MAX_NEEDED_TO		3
  #define PREPARE_LOOP \
    int save_curcs;							      \
    int *curcsp = &data->__statep->__count;
  #define EXTRA_LOOP_ARGS		, curcsp
  
  /* Definitions of initialization and destructor function.  */
  #define DEFINE_INIT	1
  #define DEFINE_FINI	1
  
  
  /* Since this is a stateful encoding we have to provide code which resets
     the output state to the initial state.  This has to be done during the
     flushing.  */
  #define EMIT_SHIFT_TO_INIT \
    if ((data->__statep->__count & ~7) != sb)				      \
      {									      \
        if (FROM_DIRECTION)						      \
  	data->__statep->__count &= 7;					      \
        else								      \
  	{								      \
  	  /* We are not in the initial state.  To switch back we have	      \
  	     to emit `SI'.  */						      \
  	  if (__glibc_unlikely (outbuf >= outend))			      \
  	    /* We don't have enough room in the output buffer.  */	      \
  	    status = __GCONV_FULL_OUTPUT;				      \
  	  else								      \
  	    {								      \
  	      /* Write out the shift sequence.  */			      \
  	      *outbuf++ = SI;						      \
  	      data->__statep->__count &= 7;				      \
  	    }								      \
  	}								      \
      }
  
  
  /* Since we might have to reset input pointer we must be able to save
     and retore the state.  */
  #define SAVE_RESET_STATE(Save) \
    if (Save)								      \
      save_curcs = *curcsp;						      \
    else									      \
      *curcsp = save_curcs
  
  
  /* Current codeset type.  */
  enum
  {
    sb = 0,
    db = 64
  };
  
  /* First, define the conversion function from IBM-933 to UCS4.  */
  #define MIN_NEEDED_INPUT	FROM_LOOP_MIN_NEEDED_FROM
  #define MAX_NEEDED_INPUT	FROM_LOOP_MAX_NEEDED_FROM
  #define MIN_NEEDED_OUTPUT	FROM_LOOP_MIN_NEEDED_TO
  #define MAX_NEEDED_OUTPUT	FROM_LOOP_MAX_NEEDED_TO
  #define LOOPFCT 		FROM_LOOP
  #define BODY \
    {									      \
      uint32_t ch = *inptr;						      \
      uint32_t res;							      \
  									      \
      if (__builtin_expect (ch, 0) == SO)					      \
        {									      \
  	/* Shift OUT, change to DBCS converter.  */			      \
  	if (curcs == db)						      \
  	  {								      \
  	    result = __GCONV_ILLEGAL_INPUT;				      \
  	    break;							      \
  	  }								      \
  	curcs = db;							      \
  	++inptr;							      \
  	continue;							      \
        }									      \
      else if (__builtin_expect (ch, 0) == SI)				      \
        {									      \
  	/* Shift IN, change to SBCS converter.  */			      \
  	if (curcs == sb)						      \
  	  {								      \
  	    result = __GCONV_ILLEGAL_INPUT;				      \
  	    break;							      \
  	  }								      \
  	curcs = sb;							      \
  	++inptr;							      \
  	continue;							      \
        }									      \
  									      \
      if (curcs == sb)							      \
        {									      \
  	/* Use the IBM933 table for single byte.  */			      \
  	res = __ibm933sb_to_ucs4[ch];					      \
  	if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')	      \
  	  {								      \
  	    /* This is an illegal character.  */			      \
  	    STANDARD_FROM_LOOP_ERR_HANDLER (1);				      \
  	  }								      \
  	else								      \
  	  {								      \
  	    put32 (outptr, res);					      \
  	    outptr += 4;						      \
  	  }								      \
  	++inptr;							      \
        }									      \
      else								      \
        {									      \
  	const struct gap *rp2 = __ibm933db_to_ucs4_idx;			      \
  									      \
  	assert (curcs == db);						      \
  									      \
  	/* Use the IBM933 table for double byte.  */			      \
  	if (__glibc_unlikely (inptr + 1 >= inend))			      \
  	  {								      \
  	    /* The second character is not available.  Store the	      \
  	       intermediate result. */					      \
  	    result = __GCONV_INCOMPLETE_INPUT;				      \
  	    break;							      \
  	  }								      \
  									      \
  	ch = (ch * 0x100) + inptr[1];					      \
  	while (ch > rp2->end)						      \
  	  ++rp2;							      \
  									      \
  	if (__builtin_expect (rp2->start == 0xffff, 0)			      \
  	    || __builtin_expect (ch < rp2->start, 0)			      \
  	    || (res = __ibm933db_to_ucs4[ch + rp2->idx],		      \
  		__builtin_expect (res, L'\1') == L'\0' && ch != '\0'))	      \
  	  {								      \
  	    /* This is an illegal character.  */			      \
  	    STANDARD_FROM_LOOP_ERR_HANDLER (2);				      \
  	  }								      \
  	else								      \
  	  {								      \
  	    put32 (outptr, res);					      \
  	    outptr += 4;						      \
  	    inptr += 2;							      \
  	  }								      \
        }									      \
    }
  #define LOOP_NEED_FLAGS
  #define EXTRA_LOOP_DECLS	, int *curcsp
  #define INIT_PARAMS		int curcs = *curcsp & ~7
  #define UPDATE_PARAMS		*curcsp = curcs
  #include <iconv/loop.c>
  
  /* Next, define the other direction.  */
  #define MIN_NEEDED_INPUT	TO_LOOP_MIN_NEEDED_FROM
  #define MAX_NEEDED_INPUT	TO_LOOP_MAX_NEEDED_FROM
  #define MIN_NEEDED_OUTPUT	TO_LOOP_MIN_NEEDED_TO
  #define MAX_NEEDED_OUTPUT	TO_LOOP_MAX_NEEDED_TO
  #define LOOPFCT			TO_LOOP
  #define BODY \
    {									      \
      uint32_t ch = get32 (inptr);					      \
      const struct gap *rp1 = __ucs4_to_ibm933sb_idx;			      \
      const struct gap *rp2 = __ucs4_to_ibm933db_idx;			      \
      const char *cp;							      \
  									      \
      if (__glibc_unlikely (ch >= 0xffff))				      \
        {									      \
  	UNICODE_TAG_HANDLER (ch, 4);					      \
  									      \
  	STANDARD_TO_LOOP_ERR_HANDLER (4);				      \
        }									      \
  									      \
      while (ch > rp1->end)						      \
        ++rp1;								      \
  									      \
      /* Use the UCS4 table for single byte.  */				      \
      if (__builtin_expect (ch < rp1->start, 0)				      \
  	|| (cp = __ucs4_to_ibm933sb[ch + rp1->idx],			      \
  	    __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))	      \
        {									      \
  	/* Use the UCS4 table for double byte.  */			      \
  	while (ch > rp2->end)						      \
  	  ++rp2;							      \
  									      \
  	if (__builtin_expect (ch < rp2->start, 0)			      \
  	    || (cp = __ucs4_to_ibm933db[ch + rp2->idx],			      \
  		__builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0'))	      \
  	  {								      \
  	    /* This is an illegal character.  */			      \
  	    STANDARD_TO_LOOP_ERR_HANDLER (4);				      \
  	  }								      \
  	else								      \
  	  {								      \
  	    if (curcs == sb)						      \
  	      {								      \
  		if (__glibc_unlikely (outptr + 1 > outend))		      \
  		  {							      \
  		    result = __GCONV_FULL_OUTPUT;			      \
  		    break;						      \
  		  }							      \
  		*outptr++ = SO;						      \
  		curcs = db;						      \
  	      }								      \
  									      \
  	    if (__glibc_unlikely (outptr + 2 > outend))			      \
  	      {								      \
  		result = __GCONV_FULL_OUTPUT;				      \
  		break;							      \
  	      }								      \
  	    *outptr++ = cp[0];						      \
  	    *outptr++ = cp[1];						      \
  	  }								      \
        }									      \
      else								      \
        {									      \
  	if (curcs == db)						      \
  	  {								      \
  	    if (__glibc_unlikely (outptr + 1 > outend))			      \
  	      {								      \
  		result = __GCONV_FULL_OUTPUT;				      \
  		break;							      \
  	      }								      \
  	    *outptr++ = SI;						      \
  	  }								      \
  									      \
  	if (__glibc_unlikely (outptr + 1 > outend))			      \
  	  {								      \
  	    result = __GCONV_FULL_OUTPUT;				      \
  	    break;							      \
  	  }								      \
  	*outptr++ = cp[0];						      \
  	curcs = sb;							      \
        }									      \
  									      \
      /* Now that we wrote the output increment the input pointer.  */	      \
      inptr += 4;								      \
    }
  #define LOOP_NEED_FLAGS
  #define EXTRA_LOOP_DECLS	, int *curcsp
  #define INIT_PARAMS		int curcs = *curcsp & ~7
  #define REINIT_PARAMS		curcs = *curcsp & ~7
  #define UPDATE_PARAMS		*curcsp = curcs
  #include <iconv/loop.c>
  
  /* Now define the toplevel functions.  */
  #include <iconv/skeleton.c>
  