/*
Copyright (c) 2004-2010, Dirk Krause
All rights reserved.

Redistribution and use in source and binary forms,
with or without modification, are permitted provided
that the following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.
* Redistributions in binary form must reproduce the above 
  opyright notice, this list of conditions and the following
  disclaimer in the documentation and/or other materials
  provided with the distribution.
* Neither the name of the Dirk Krause nor the names of
  contributors may be used to endorse or promote
  products derived from this software without specific
  prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
*/



/**	@file	dkle.c	LaTeX encoder module.
*/



#include "dk.h"
#include "dkmem.h"
#include "dksf.h"
#include "dkerror.h"
#include "dkstr.h"
#include "dkstream.h"
#include "dkl2l.h"

/**	Inside the dklatsup module.
*/
#define DK_LATSUP_C

#include "dkle.h"
#include "dkenc.h"




#line 62 "dkle.ctr"




/**	Abbreviation for use with sizeof operator.
*/
typedef void *VPTR;


/**	File open mode.
*/
static char str_r[] = { "r" };



/**	LaTeX command to open math mode.
*/
static char str_mm_open[] = { "\\(" };

/**	LaTeX command to close math mode.
*/
static char str_mm_close[] = { "\\)" };



/**	Flag: Have character in cache.
*/
#define	FLAG_HAVE_CACHE		1



/**	Release translation tables.
	@param	d	Array of translation entries.
*/
static void
release_v4 DK_P1(dk_le_ct_t *,d)
{
  dk_le_ct_t *ct; size_t i; char *x;
  
  ct = d;
  for(i = 0; i < 256; i++) {
    if(ct->t) { 
      x = ct->t; dk_delete(x);
    }
    if(ct->m) {	
      x = ct->m; dk_delete(x);
    }
    if(ct->a) { 
      x = ct->a; dk_delete(x);
    }
    ct->t = ct->m = ct->a = NULL;
    ct++;
  }
  dk_delete(d);
  
}



/**	Release translation tables, third directory level.
	@param	d	Pointer array.
*/
static void
release_v3 DK_P1(VPTR *,d)
{
  VPTR *vptr; size_t i;
  
  vptr = d;
  for(i = 0; i < 256; i++) {
    if(*vptr) {		
      release_v4((dk_le_ct_t *)(*vptr));
      *vptr = NULL;
    }
    vptr++;
  }
  dk_delete(d);
  
}



/**	Release translation tables, second directory level.
	@param	d	Pointer array.
*/
static void
release_v2 DK_P1(VPTR *,d)
{
  VPTR *vptr; size_t i;
  
  vptr = d;
  for(i = 0; i < 256; i++) {
    if(*vptr) {		
      release_v3((VPTR *)(*vptr));
      *vptr = NULL;
    }
    vptr++;
  }
  dk_delete(d);
  
}



/**	Release translation tables, first directory level.
	@param	d	Pointer array.
*/
static void
release_v1 DK_P1(VPTR *,d)
{
  VPTR *vptr; size_t i;
  
  vptr = d;
  for(i = 0; i < 256; i++) {
    if(*vptr) {		
      release_v2((VPTR *)(*vptr));
      *vptr = NULL;
    }
    vptr++;
  }
  dk_delete(d);
  
}



void
dkle_close DK_P1(dk_le_t *,leptr)
{
  char *x;
  
  if(leptr) {
    if(leptr->filename) {
      x = leptr->filename; dk_delete(x);
    }
    if(leptr->dirname) {
      x = leptr->dirname; dk_delete(x);
    }
    if(leptr->data) {
      release_v1((VPTR *)(leptr->data));
      leptr->data = NULL;
    }
    leptr->filename = NULL;
    leptr->dirname = NULL;
    dk_delete(leptr);
  }
  
}



/**	Initialize dk_le_t structure.
	@param	leptr	Struture to initialize.
	@param	dirname	Directory containing the encoding data files.
	@return	1 on success, 0 on error.
*/
static
int
dkle_init DK_P2(dk_le_t *,leptr, char *,dirname)
{
  int back = 0;
  size_t sz;
  
  leptr->dirname = NULL;
  leptr->filename = NULL;
  sz = strlen(dirname); sz++;
  leptr->dirname = dk_new(char,sz);
  sz += 15;	/* "/000000.dat" */
  leptr->filename = dk_new(char,sz);
  if((leptr->dirname) && (leptr->filename)) {
    back = 1;
    strcpy(leptr->dirname, dirname);
    leptr->flags = 0;
    leptr->cache_element = 0UL;
    leptr->cache_ptr = NULL;
    leptr->data = NULL;
  }
  
  return back;
}



dk_le_t *
dkle_open DK_P1(char *, dirname)
{
  dk_le_t *back = NULL;
  
  back = dk_new(dk_le_t,1);
  if(back) {
    if(!dkle_init(back, dirname)) {
      dkle_close(back);
      back = NULL;
    }
  }
  
  return back;
}



/**	Allocate new pointer array for code block.
	@return	Pointer to memory on success, NULL on error.
*/
static VPTR *
new_vptr_array DK_P0()
{
  VPTR *back = NULL, *vptr; size_t i;
  
  back = dk_new(VPTR,256);
  if(back) {
    vptr = back;
    for(i = 0; i < 256; i++) {
      *(vptr++) = NULL;
    }
  }
  
  return back;
}



/**	Remove trailing newline from a string if present.
	@param	l	String to modify.
*/
static void
remove_nl DK_P1(char *,l)
{
  char *ptr;
  
  ptr = l;
  while(*ptr) {
    switch(*ptr) {
      case '\r': case '\n': {
	*ptr = '\0';
      } break;
      default: {
	ptr++;
      } break;
    }
  }
  
}



/**	Entry mode names.
*/
static char *the_types[] = {
  "t$ext", "m$ath", "a$ll", "*",
  NULL
};



/**	Add one input line to the current table.
	@param	le	LaTeX encoder object.
	@param	ct	Current encoder table.
	@param	il	Input line.
	@return	1 on success, 0 on error.
*/
static int
add_input_line DK_P3(dk_le_t *,le, dk_le_ct_t *,ct, char *,il)
{
  int back = 0, t1, t2, reason;
  char chr, *p1, *p2, *p3, *newptr, *x;
  unsigned long ul; size_t s;
  
  reason = DK_ERR_SYNTAX;
  remove_nl(il);
  p1 = dkstr_start(il, NULL);
  if(p1) {		
    if(*p1 == '#') {
      back = 1;		
    } else {		
      p2 = dkstr_next(p1, NULL);
      if(p2) {		
	p3 = dkstr_next(p2, NULL);
	if(p3) {	
	  t1 = dkstr_array_abbr(the_types, p1, '$', 1);
	  if(t1 >= 0) {	
	    chr = 0; ul = 0UL; t2 = 0;
	    switch(*p2) {
	      case '0' : {	
		if((p2[1] == 'x') || (p2[1] == 'X')) {
		  t2 = 1;	
		}
	      } break;
	      case '\'': {	
		t2 = 2;
	      } break;
	    }
	    switch(t2) {
		case 1: {	
		  if(sscanf(&(p2[2]), "%lx", &ul) == 1) {
		    back = 1;
		  }
		} break;
		case 2: {	
		  p2++;
		  if(*p2 == '\\') {
		    p2++;
		    switch(*p2) {
		      case 'n': {
			chr = '\n';
		      } break;
		      case 'r': {
			chr = '\r';
		      } break;
		      case 't': {
			chr = '\t';
		      } break;
		      case 'a': {
			chr = '\a';
		      } break;
		      case 'b': {
			chr = '\b';
		      } break;
		      default: {
			chr = *p2;
		      } break;
		    }
		  } else {
		    chr = *p2;
		  }
		  ul = (unsigned long)((unsigned char)chr);
		  ul &= 255UL;
		  back = 1;
		} break;
		default: {	
		  if(sscanf(p2, "%lu", &ul) == 1) {
		    back = 1;
		  }
		} break;
	    }
	    if(back) {
		back = 0;
		s = ul; s &= 0x00FF;
		newptr = dkstr_dup(p3);
		if(newptr) {
		  back = 1;
		  switch(t1) {
		    case 0: {	
		      if(ct[s].t) {
			x = ct[s].t; dk_delete(x);
		      }
		      ct[s].t = newptr;
		    } break;
		    case 1: {	
		      if(ct[s].m) {
			x = ct[s].m; dk_delete(x);
		      }
		      ct[s].m = newptr;
		    } break;
		    default: {	
		      if(ct[s].a) {
			x = ct[s].a; dk_delete(x);
		      }
		      ct[s].a = newptr;
		    } break;
		  }
		} else {
		  reason = DK_ERR_NOMEM;
		}
	    }
	  } else {			
	  }
	}
      }
    }
  } else {		/* empty line */
    back = 1;		
  }
  if(!back) {
    le->error_code = reason;
  }
  
  return back;
}



/**	Create new encoding table, allocate memory.
	@param	le	LaTeX encoder object.
	@param	cd	Number of the code block.
	@return	Pointer to new table on success, NULL on error.
*/
static dk_le_ct_t *
new_ct DK_P2(dk_le_t *,le, dk_udword,cd)
{
  dk_le_ct_t *back = NULL, *ct; size_t i;
  dk_stream_t *istrm = NULL;
  int r = 0, cc = 1;
  char inputline[128];
  
  sprintf(
    le->filename,
    "%s/%02lx/%02lx/%02lx.dat",
    le->dirname,
    ((cd >> 16) & 0x000000FFUL),
    ((cd >>  8) & 0x000000FFUL),
    (cd & 0x000000FFUL)
  );
  dksf_correct_fnsep(le->filename); 
  istrm = dkstream_openfile(le->filename, str_r, 0, &r);
#if DK_HAVE_ZLIB_H
  if(!istrm) {
    sprintf(le->filename, "%s/%06lx.gz", le->dirname, cd);
    dksf_correct_fnsep(le->filename); 
    istrm = dkstream_opengz(le->filename, str_r, 0, &r);
  }
#endif
#if DK_HAVE_BZLIB_H
  if(!istrm) {
    sprintf(le->filename, "%s/%06lx.bz2", le->dirname, cd);
    dksf_correct_fnsep(le->filename); 
    istrm = dkstream_openbz2(le->filename, str_r, 0, &r);
  }
#endif
  if(istrm) {
    le->error_line = 0;
    back = dk_new(dk_le_ct_t,256);
    if(back) {
      ct = back;
      for(i = 0; i < 256; i++) {
	ct->m = NULL; ct->t = NULL; ct->a = NULL; ct++;
      }
      cc = 1;
      while(cc) {
	if(dkstream_gets(istrm, inputline, sizeof(inputline))) {
	  le->error_line += 1UL;
	  if(!add_input_line(le, back, inputline)) {
	    cc = 0; dk_delete(back); back = 0;
	  }
	} else {
	  cc = 0;
	}
      }
    }
    dkstream_close(istrm); istrm = NULL;
  }
  
  return back;
}



/**	Set cache for last used encoding table.
	@param	le	LaTeX encoder object.
	@param	cd	Current data table number.
	@return	1 on success, 0 on error.
*/
static int
set_cache_to DK_P2(dk_le_t *,le, dk_udword,cd)
{
  int back = 0;
  VPTR *v1, *v2, *v3;
  
  if(le) {
    if(((le->flags) & FLAG_HAVE_CACHE)
       && (le->cache_element == cd) && (le->cache_ptr))
    {
      back = 1;
    } else {
      unsigned long i1, i2, i3; size_t s1, s2, s3;
      i1 = (cd >> 16) & 0x000000FFUL; s1 = ((size_t)i1) & 255;
      i2 = (cd >>  8) & 0x000000FFUL; s2 = ((size_t)i2) & 255;
      i3 = cd & 0x000000FFUL;         s3 = ((size_t)i3) & 255;
      if(!(le->data)) {
	le->data = (void *)new_vptr_array();
	if(!(le->data)) {
	  le->error_code = DK_ERR_NOMEM;
	}
      }
      if(le->data) {
	v1 = (VPTR *)(le->data);
	if(!(v1[s1])) {
	  v1[s1] = (void *)new_vptr_array();
	  if(!(v1[s1])) {
	    le->error_code = DK_ERR_NOMEM;
	  }
	}
	if(v1[s1]) {
	  v2 = (VPTR *)(v1[s1]);
	  if(!(v2[s2])) {
	    v2[s2] = (void *)new_vptr_array();
	    if(!(v2[s2])) {
	      le->error_code = DK_ERR_NOMEM;
	    }
	  }
	  if(v2[s2]) {
	    v3 = (VPTR *)(v2[s2]);
	    if(!(v3[s3])) {
	      v3[s3] = new_ct(le, cd);
	    }
	    if(v3[s3]) {
	      le->cache_element = cd;
	      le->cache_ptr = (dk_le_ct_t *)(v3[s3]);
	      le->flags |= FLAG_HAVE_CACHE;
	      back = 1;
	    }
	  }
	}
      }
    }
  }
  
  return back;
}



int
dkle_load DK_P2(dk_le_t *,le, dk_udword,uc32)
{
  int back = 0;
  
  if(le) {
    if(set_cache_to(le, ((uc32 >> 8) & 0x00FFFFFFUL))) {
      back = 1;
    }
  }
  
  return back;
}



char *
dkle_get_encoding DK_P3(dk_le_t *,le, dk_udword,uc32, int,mm)
{
  char *back = NULL; dk_le_ct_t *ct;
  size_t sz;
  
  if(le) {
    if(set_cache_to(le, ((uc32 >> 8) & 0x00FFFFFFUL))) {
      sz = (size_t)(uc32 & 0x000000FFUL);
      sz &= 255;
      ct = le->cache_ptr;
      if(mm) {
	back = ct[sz].m;
      } else {
	back = ct[sz].t;
      }
      if(!back) {
	back = ct[sz].a;
      }
    }
  }
  
  return back;
}



int
dkle_get_error_code DK_P2(dk_le_t *,l,int,res)
{
  int back = 0;
  if(l) {
    back = l->error_code;
    if(res) {
      l->error_code = 0;
    }
  }
  return back;
}



char *
dkle_get_filename DK_P1(dk_le_t *,l)
{
  char *back = NULL;
  if(l) {
    back = l->filename;
  }
  return back;
}



unsigned long
dkle_get_error_lineno DK_P1(dk_le_t *,l)
{
  unsigned long back = 0UL;
  if(l) {
    back = l->error_line;
  }
  return back;
}



/*
  To allocate memory add 1 to the result of dkle_length_plain
  for the finalizing 0x00 byte.
*/
size_t
dkle_length_plain_to_latex DK_P2(dk_le_t *,le, char *,s)
{
  size_t back = 0;
  int error_found = 0;
  char *ptr;
  char *res;
  int in_math_mode = 0;
  size_t	sl_mm_open = 2;
  size_t	sl_mm_close = 2;
  
  if((le) && (s)) {
    sl_mm_open = strlen(str_mm_open);
    sl_mm_close = strlen(str_mm_close);
    back = 0;
    ptr = s;
    while(*ptr) {
      res = dk_l2l_encoding(*ptr);
      if(res) {
        back += strlen(res);
	if(in_math_mode) {
	  back += sl_mm_close;
	}
	in_math_mode = 0;
      } else {
        char c;
        unsigned char uc;
	unsigned long ul;
	c = *ptr;
	uc = (unsigned char)c;
	ul = (unsigned long)uc;
	if(dkle_load(le, ul)) {
	  res = dkle_get_encoding(le, ul, 0);
	  if(res) {
	    back += strlen(res);
	    if(in_math_mode) {
	      back += sl_mm_close;
	    }
	    in_math_mode = 0;
	  } else {
	    res = dkle_get_encoding(le, ul, 1);
	    if(res) {
	      back += strlen(res);
	      if(!in_math_mode) {
	        back += sl_mm_open;
	      }
	      in_math_mode = 1;
	    } else {	
	      error_found = 1;
	    }
	  }
	} else {	
	  error_found = 1;
	}
      }
      ptr++;
    }
    if(in_math_mode) {
      back += sl_mm_close;
    }
    if(error_found) {
      back = 0;			
    }
  } 
  return back;
}



size_t
dkle_length_utf8_to_latex DK_P2(dk_le_t *,le, char *,s)
{
  size_t back = 0;
  int cc;
  size_t avail, step;
  dk_udword ucb;
  char *ptr, *found;
  int in_math_mode, error_found;
  size_t sl_mm_open, sl_mm_close;
  
  if((le) && (s)) {
    error_found = 0;
    sl_mm_open = strlen(str_mm_open);
    sl_mm_close = strlen(str_mm_close);
    ptr = s; cc = 1; avail = strlen(s); in_math_mode = 0;
    while(cc) {
      cc = 0;
      if(avail > 0) {
        step = 0;
	ucb = 0UL;
	cc = dkenc_utf82uc(&ucb, (unsigned char *)ptr, avail, &step);
	if(cc) {
	  found = NULL;
	  if(dkle_load(le, ucb)) {
	    found = dkle_get_encoding(le, ucb, 0);
	    if(found) {
	      back += strlen(found);
	      if(in_math_mode) {
	        back += sl_mm_close;
	      }
	      in_math_mode = 0;
	    } else {
	      found = dkle_get_encoding(le, ucb, 1);
	      if(found) {
	        back += strlen(found);
	        if(!in_math_mode) {
		  back += sl_mm_open;
		}
		in_math_mode = 1;
	      } else {
	        if(ucb < 256UL) {
		  found = dk_l2l_encoding((char)ucb);
		  if(in_math_mode) {
		    back += sl_mm_close;
		  }
		  in_math_mode = 0;
		  if(found) {
		    back += strlen(found);
		  } else {
		    back++;
		  }
		}
	      }
	    }
	  } else {
	    error_found = 1; cc = 0;
	    /* ##### ERROR: Failed to load table */
	  }
	  if(step < avail) {
	    avail = avail - step;
	  } else {
	    avail = 0;
	  }
	  while(step--) ptr++;
	} else {
	  /* ##### ERROR: Conversion failed */
	  error_found = 1;
	}
      } 
      if(error_found) { cc = 0; }
    }
    if(in_math_mode) {
      back += sl_mm_close;
    } in_math_mode = 0;
    if(error_found) {
      back = 0;
    }
  } 
  return back;
}



int
dkle_put_utf8_to_latex DK_P4(dk_le_t *,le, char *,d, size_t,sz, char *,s)
{
  int back = 0;
  int cc;
  size_t avail, step;
  dk_udword ucb;
  char *ptr, *found;
  int in_math_mode, error_found;
  size_t sl_mm_open, sl_mm_close, sl_d;

  if((le) && (s)) {
    back = 1;
    sl_mm_open = strlen(str_mm_open);
    sl_mm_close = strlen(str_mm_close);
    ptr = s; cc = 1; avail = strlen(s); in_math_mode = 0;
    error_found = 0;
    *d = '\0';
    while(cc) {
      sl_d = strlen(d);
      cc = 0;
      if(avail > 0) {
        step = 0;
	ucb = 0UL;
	cc = dkenc_utf82uc(&ucb, (unsigned char *)ptr, avail, &step);
	if(cc) {
	  found = NULL;
	  if(dkle_load(le, ucb)) {
	    found = dkle_get_encoding(le, ucb, 0);
	    if(found) {
	      if(in_math_mode) {
	        if(sl_d + sl_mm_close + strlen(found) < sz) {
		  strcat(d, str_mm_close);
		  strcat(d, found);
		} else {
		  error_found = 1;
		  le->error_code = DK_ERR_STRING_TOO_LONG;
		}
	      } else {
	        if(sl_d + strlen(found) < sz) {
		  strcat(d, found);
		} else {
		  error_found = 1;
		  le->error_code = DK_ERR_STRING_TOO_LONG;
		}
	      }
	      in_math_mode = 0;
	    } else {
	      found = dkle_get_encoding(le, ucb, 1);
	      if(found) {
	        if(!in_math_mode) {
		  if(sl_d + sl_mm_open + strlen(found) < sz) {
		    strcat(d, str_mm_open);
		    strcat(d, found);
		  } else {
		    error_found = 1;
		    le->error_code = DK_ERR_STRING_TOO_LONG;
		  }
		} else {
		  if(sl_d + strlen(found) < sz) {
		    strcat(d, found);
		  } else {
		    error_found = 1;
		    le->error_code = DK_ERR_STRING_TOO_LONG;
		  }
		}
		in_math_mode = 1;
	      } else {
	        if(ucb < 256UL) {
		  found = dk_l2l_encoding((char)ucb);
		  if(in_math_mode) {
		    if(sl_d + sl_mm_close < sz) {
		      strcat(d, str_mm_close);
		      sl_d = strlen(d);
		    } else {
		      error_found = 1;
		      le->error_code = DK_ERR_STRING_TOO_LONG;
		    }
		  }
		  in_math_mode = 0;
		  if(found) {
		    if(sl_d + strlen(found) < sz) {
		      strcat(d, found);
		    } else {
		      error_found = 1;
		      le->error_code = DK_ERR_STRING_TOO_LONG;
		    }
		  } else {
		    if(sl_d + 1 < sz) {
		      d[sl_d] = *ptr;
		      d[sl_d+1] = '\0';
		    } else {
		      error_found = 1;
		      le->error_code = DK_ERR_STRING_TOO_LONG;
		    }
		  }
		}
	      }
	    }
	  } else {
	    error_found = 1; cc = 0;
	    /* ##### ERROR: Failed to load table */
	  }
	  if(step < avail) {
	    avail = avail - step;
	  } else {
	    avail = 0;
	  }
	  while(step--) ptr++;
	} else {
	  /* ##### ERROR: Conversion failed */
	  error_found = 1;
	}
      } 
      if(error_found) { cc = 0; }
    }
    if(in_math_mode) {
      if(strlen(d) + sl_mm_close < sz) {
        strcat(d, str_mm_close);
      } else {
        error_found = 1;
	le->error_code = DK_ERR_STRING_TOO_LONG;
      }
    } in_math_mode = 0;
    if(error_found) {
      back = 0;
    }
  }
  return back;
}



int
dkle_put_plain_to_latex DK_P4(dk_le_t *,le, char *,d, size_t,sz, char *,s)
{
  int back = 0;
  int error_found = 0;
  int in_math_mode = 0;
  char *ptr;
  char *res;
  size_t sl_mm_open = 2;
  size_t sl_mm_close = 2;
  size_t sl_d = 0;
  
  if((le) && (d) && (s) && (sz > 0)) {
    back = 1;
    sl_mm_open = strlen(str_mm_open);
    sl_mm_close = strlen(str_mm_close);
    *d = '\0';
    ptr = s;
    while((*ptr) && (!error_found)) {
      sl_d = strlen(d);
      res = dk_l2l_encoding(*ptr);
      if(res) {
	if(in_math_mode) {
	  if(sl_d + sl_mm_close + strlen(res) < sz) {
	    strcat(d, str_mm_close);
	    strcat(d, res);
	  } else {	
	    error_found = 1;
	    le->error_code = DK_ERR_STRING_TOO_LONG;
	  }
	} else {
	  if(sl_d + strlen(res) < sz) {
	    strcat(d, res);
	  } else {	
	    error_found = 1;
	    le->error_code = DK_ERR_STRING_TOO_LONG;
	  }
	}
	in_math_mode = 0;
      } else {
        char c;
	unsigned char uc; unsigned long ul;
	c = *ptr;
	uc = (unsigned char)c; ul = (unsigned long)uc;
	if(dkle_load(le, ul)) {
	  res = dkle_get_encoding(le, ul, 0);
	  if(res) {
	    if(in_math_mode) {
	      if(sl_d + sl_mm_close + strlen(res) < sz) {
	        strcat(d, str_mm_close);
		strcat(d, res);
	      } else {		
	        error_found = 1;
		le->error_code = DK_ERR_STRING_TOO_LONG;
	      }
	    } else {
	      if(sl_d + strlen(res) < sz) {
	        strcat(d, res);
	      } else {		
	        error_found = 1;
		le->error_code = DK_ERR_STRING_TOO_LONG;
	      }
	    }
	    in_math_mode = 0;
	  } else {
	    res = dkle_get_encoding(le, ul, 1);
	    if(res) {
	      if(in_math_mode) {
	        if(sl_d + strlen(res) < sz) {
		  strcat(d, res);
		} else {	
		  error_found = 1;
		  le->error_code = DK_ERR_STRING_TOO_LONG;
		}
	      } else {
	        if(sl_d + sl_mm_open + strlen(res) < sz) {
		  strcat(d, str_mm_open);
		  strcat(d, res);
		} else {	
		  error_found = 1;
		  le->error_code = DK_ERR_STRING_TOO_LONG;
		}
	      }
	      in_math_mode = 1;
	    } else {	
	      error_found = 1;
	    }
	  }
	} else {	
	  error_found = 1;
	}
      }
      ptr++;
    }
    if(in_math_mode) {
      if(strlen(d) + sl_mm_close < sz) {
        strcat(d, str_mm_close);
      } else {	
        error_found = 1;
	le->error_code = DK_ERR_STRING_TOO_LONG;
      }
    }
  }
  if(error_found) {
    back = 0;		
  } 
  return back;
}