/********************************************************************

   bef2c.c - Befunge-93 to ANSI C Compiler in ANSI C
   v0.94 Sep 20 2004 Chris Pressey, Cat's-Eye Technologies
   http://catseye.webhop.net/projects/bef/

   Copyright (c)1997-2004, Cat's Eye Technologies.
   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 copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.

     Neither the name of Cat's Eye Technologies nor the names of its
     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 REGENTS 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. 

   ******************************************************************

   Usage :

   bef2c [-p] [-o] [-w width] [-h height] <befunge-source> <c-destination>

     -p : suppress pre-optimization
     -o : suppress post-optimization
     -w : explicit width
     -h : explicit height

   Known to Compile Under :

	Borland C++ v3.1 (DOS)

   History:

     v0.94: Sep 2004, Chris Pressey
        display correct version number
        cleanup only, no functional changes

     v0.93, Jul 19 2000, Chris Pressey
        added defines for Metroworks CodeWarrior
          so that bef2c will build on MacOS
        relicensed under BSD license

     v0.92, Jun 21 1997, Chris Pressey
        original release of bef2c.c

 */

/********************************************************* #INCLUDE'S */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>

/********************************************************** #DEFINE'S */

int linewidth = 1;       /* 80 */
int pageheight = 1;      /* 25 */

#define cur pg[y * 80 + x]
#define shrink(s) s[strlen(s)-1]=0

#define RIGHT "_%2.2d_%2.2d_R"
#define LEFT  "_%2.2d_%2.2d_L"
#define UP    "_%2.2d_%2.2d_U"
#define DOWN  "_%2.2d_%2.2d_D"

#define y_down   (y+1)%pageheight
#define y_up     (y ? y-1 : pageheight-1)
#define x_right  (x+1)%linewidth
#define x_left   (x ? x-1 : linewidth-1)

#define y_2down   (y+2)%pageheight
#define y_2up     ((y>1) ? y-2 : ((pageheight-2)<0 ? 0 : (pageheight-2)))
#define x_2right  (x+2)%linewidth
#define x_2left   ((x>1) ? x-2 : ((linewidth-2)<0 ? 0 : (linewidth-2)))

#define ALL RIGHT ": " LEFT ": " UP ": " DOWN ":\n"

#define ECHO(s)   fprintf(fo, RIGHT ": " s " goto " RIGHT ";\n", x, y, x_right, y); \
	  fprintf(fo, LEFT ": " s " goto " LEFT ";\n", x, y, x_left, y);           \
	  fprintf(fo, UP ": " s " goto " UP ";\n", x, y, x, y_up);               \
	  fprintf(fo, DOWN ": " s " goto " DOWN ";\n", x, y, x, y_down);

/*************************************************** GLOBAL VARIABLES */

char in[255];
char pg[2000];                   /* befunge 'page' of source */
int x = 0, y = 0, d = 0;         /* loopers */
int pre_optimize = 1;		 /* flag: optimize before compile? */
int post_optimize = 1;		 /* flag: optimize after compile? */

int labelrefs[8000];             /* postoptimization table */
char s[255];
char t[255];

/******************************************************* MAIN PROGRAM */

int main (argc, argv)
     int argc;
     char **argv;
{
  FILE *fi;
  FILE *fo;

  int i;

#ifdef __MWERKS__
  argc = ccommand(&argv);
#endif /* __MWERKS__ */

  srand (time (0));

  printf ("Befunge-93 to ANSI C Compiler v0.94\n");

  if (argc < 3)
  {
    printf ("USAGE : %s [-p] [-o] [-w width] [-h height] <befunge-source> <c-destination>\n", argv[0]);
    exit (0);
  }
  for (i = 1; i < argc; i++)
  {
    if (!strcmp(argv[i], "-p")) { pre_optimize = 0; linewidth=80; pageheight=25; }
    if (!strcmp(argv[i], "-o")) { post_optimize = 0; }
    if (!strcmp(argv[i], "-w")) { linewidth = atoi(argv[i+1]); }
    if (!strcmp(argv[i], "-h")) { pageheight = atoi(argv[i+1]); }
  }
  if ((fi = fopen (argv[argc - 2], "r")) != NULL)             /*** Input Phase */
  {
    int x = 0, y = 0;
    while (!feof (fi))
    {
      cur = fgetc (fi);
      if ((x+1)>linewidth) linewidth=x+1;
      if ((y+1)>pageheight) pageheight=y+1;
      if (cur == '\n')
      {
	cur = ' ';
	x = 0;
	y++;
	if (y >= 25) break;
      } else
      {
	x++;
	if (x >= 80)
	{
	  x = 0;
	  y++;
	  if (y >= 25) break;
	}
      }
    }
    fclose (fi);
  } else
  {
    printf ("Error : couldn't open '%s' for input.\n", argv[argc - 1]);
    exit (0);
  }

  if (!(fo = fopen (argv[argc - 1], "w")))             /*** Output */
  {
    printf ("Error : couldn't open '%s' for output.\n", argv[argc - 1]);
    exit (0);
  }

  printf ("Compiling");

  fprintf (fo, "/* %s converted to ANSI C from %s by bef2c */\n",
	       argv[argc-1], argv[argc-2]);
  fprintf (fo, "#include <stdio.h>\n");
  fprintf (fo, "#include <stdlib.h>\n");
  fprintf (fo, "#include <time.h>\n\n");

  fprintf (fo, "char pg[%d];\n\n", 2000);

  fprintf (fo, "struct stack\n{\n  signed long val;\n  struct stack *next;\n} *head;\n\n");

  fprintf (fo, "void push (signed long val);\nsigned long pop (void);\n\n");

  fprintf (fo, "void main ()\n{\n  signed long a; signed long b; char c; srand (time (0));\n\n");

  for(y = 0; y < pageheight; y++)
  {
    for(x = 0; x < linewidth; x++)
    {
      if (cur!='\\')
      {
	fprintf (fo, "  pg[%d]='%c';\n", y * 80 + x, cur);
      } else
      {
	fprintf (fo, "  pg[%d]='%c%c';\n", y * 80 + x, cur, cur);
      }
    }
  }

  printf (".");

  for(y = 0; y < pageheight; y++)
  {
    for(x = 0; x < linewidth; x++)
    {
      switch (cur)
      {
	case '0': case '1': case '2': case '3': case '4':
	case '5': case '6': case '7': case '8': case '9':
	  fprintf(fo, RIGHT ": push(%c); goto " RIGHT ";\n", x, y, cur, x_right, y);
	  fprintf(fo, LEFT ": push(%c); goto " LEFT ";\n", x, y, cur, x_left, y);
	  fprintf(fo, UP ": push(%c); goto " UP ";\n", x, y, cur, x, y_up);
	  fprintf(fo, DOWN ": push(%c); goto " DOWN ";\n", x, y, cur, x, y_down);
	  break;
	case '>':            /* PC Right */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  goto " RIGHT ";\n", x_right, y);
	  break;
	case '<':            /* PC Left */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  goto " LEFT ";\n", x_left, y);
	  break;
	case '^':            /* PC Up */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  goto " UP ";\n", x, y_up);
	  break;
	case 'v':            /* PC Down */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  goto " DOWN ";\n", x, y_down);
	  break;
	case '|':            /* Vert If */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  if (pop ()) goto " UP "; else goto " DOWN ";\n", x, y_up, x, y_down);
	  break;
	case '_':            /* Horiz If */
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  if (pop ()) goto " LEFT "; else goto " RIGHT ";\n", x_left, y, x_right, y);
	  break;
	case '+':
	  ECHO("push(pop()+pop());");
	  break;
	case '-':
	  ECHO("a=pop();b=pop();push(b-a);");
	  break;
	case '*':
	  ECHO("push(pop()*pop());");
	  break;
	case '/':
	  ECHO("a=pop();b=pop();push(b/a);");
	  break;
	case '%':
	  sprintf(t, "a=pop();b=pop();push(b%ca);", '%');
	  fprintf(fo, RIGHT ": %s goto " RIGHT ";\n", x, y, t, x_right, y);
	  fprintf(fo, LEFT ": %s goto " LEFT ";\n", x, y, t, x_left, y);
	  fprintf(fo, UP ": %s goto " UP ";\n", x, y, t, x, y_up);
	  fprintf(fo, DOWN ": %s goto " DOWN ";\n", x, y, t, x, y_down);
	  break;
	case '\\':
	  ECHO("a=pop();b=pop();push(a);push(b);");
	  break;
	case ':':
	  ECHO("a=pop();push(a);push(a);");
	  break;
	case '.':
	  fprintf(fo, RIGHT ": fprintf(stdout,\"%cld \",pop());fflush(stdout); goto " RIGHT ";\n", x, y, '%', x_right, y);
	  fprintf(fo, LEFT ": fprintf(stdout,\"%cld \",pop());fflush(stdout); goto " LEFT ";\n", x, y, '%', x_left, y);
	  fprintf(fo, UP ": fprintf(stdout,\"%cld \",pop());fflush(stdout); goto " UP ";\n", x, y, '%', x, y_up);
	  fprintf(fo, DOWN ": fprintf(stdout,\"%cld \",pop());fflush(stdout); goto " DOWN ";\n", x, y, '%', x, y_down);
	  break;
	case ',':
	  fprintf(fo, RIGHT ": fprintf(stdout,\"%cc\",pop());fflush(stdout); goto " RIGHT ";\n", x, y, '%', x_right, y);
	  fprintf(fo, LEFT ": fprintf(stdout,\"%cc\",pop());fflush(stdout); goto " LEFT ";\n", x, y, '%', x_left, y);
	  fprintf(fo, UP ": fprintf(stdout,\"%cc\",pop());fflush(stdout); goto " UP ";\n", x, y, '%', x, y_up);
	  fprintf(fo, DOWN ": fprintf(stdout,\"%cc\",pop());fflush(stdout); goto " DOWN ";\n", x, y, '%', x, y_down);
	  break;
	case '&':
	  fprintf(fo, RIGHT ": fscanf(stdin,\"%cld\",&b);push(b); goto " RIGHT ";\n", x, y, '%', x_right, y);
	  fprintf(fo, LEFT ": fscanf(stdin,\"%cld\",&b);push(b); goto " LEFT ";\n", x, y, '%', x_left, y);
	  fprintf(fo, UP ": fscanf(stdin,\"%cld\",&b);push(b); goto " UP ";\n", x, y, '%', x, y_up);
	  fprintf(fo, DOWN ": fscanf(stdin,\"%cld\",&b);push(b); goto " DOWN ";\n", x, y, '%', x, y_down);
	  break;
	case '~':
	  fprintf(fo, RIGHT ": c=fgetc(stdin);push(c); goto " RIGHT ";\n", x, y, '%', x_right, y);
	  fprintf(fo, LEFT ": c=fgetc(stdin);push(c); goto " LEFT ";\n", x, y, '%', x_left, y);
	  fprintf(fo, UP ": c=fgetc(stdin);push(c); goto " UP ";\n", x, y, '%', x, y_up);
	  fprintf(fo, DOWN ": c=fgetc(stdin);push(c); goto " DOWN ";\n", x, y, '%', x, y_down);
	  break;
	case '"':  /* ha! */
	  ECHO("puts(\"Error: compiled Befunge does not support stringmode\n\");");
	  break;
	case '!':
	  ECHO("if(pop()) push(0); else push(1);");
	  break;
	case '`':
	  ECHO("b=pop();a=pop();push(a>b);");
	  break;
	case '$':
	  ECHO("pop();");
	  break;
	case '?':
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, " switch ((rand () / 32) %c 4) \n"
		      " { case 0: goto " RIGHT ";\n"
		      "   case 1: goto " LEFT ";\n"
		      "   case 2: goto " UP ";\n"
		      "   case 3: goto " DOWN "; }\n",
		  '%', x_right, y, x_left, y, x, y_up, x, y_down);
	  break;
	case '#':
	  fprintf(fo, RIGHT ": goto " RIGHT ";\n", x, y, x_2right, y);
	  fprintf(fo, LEFT ": goto " LEFT ";\n", x, y, x_2left, y);
	  fprintf(fo, UP ": goto " UP ";\n", x, y, x, y_2up);
	  fprintf(fo, DOWN ": goto " DOWN ";\n", x, y, x, y_2down);
	  break;
	case 'g':
	  ECHO("a=pop();b=pop();push(pg[a*80+b]);");
	  break;
	case 'p':
	  ECHO("a=pop();b=pop();pg[a*80+b]=pop();");
	  break;
	case '@':
	  fprintf(fo, ALL, x, y, x, y, x, y, x, y);
	  fprintf(fo, "  exit(0);");
	  break;
	default:
	  ECHO("");
	  break;
      }
    }
    printf (".");
  }

  fprintf (fo, "\n}\n\n");

  fprintf (fo, "void push (signed long val)\n{\n  struct stack *s;  s = (struct stack *) malloc (sizeof (struct stack));  s->val = val;\ns->next = head;  head = s;\n}\n\n");

  fprintf (fo, "signed long pop ()\n{\nsigned long v;struct stack *s = head;\nif(s){v=head->val;head=head->next;free(s);return v;\n}else{return 0;}\n}\n\n");

  if (fi) fclose (fi);
  if (fo) fclose (fo);

  printf ("done.\n");
  if (post_optimize)
  {
    int x0 = 0; int y0 = 0; int x1 = 0; int y1 = 0; int i = 0;
    printf ("Optimizing");

    for (i=0; i < (linewidth*pageheight); i++)
    {
      for(y = 0; y < 25; y++)
      {
	for(x = 0; x < 80; x++)
	{
	  labelrefs[y * 80 + x] = 0;
	}
      }
      if ((fi = fopen (argv[argc - 1], "r")) != NULL)
      {
	while (!feof(fi))
	{
	  fscanf(fi, "%s", in);
	  if (!strcmp(in, "goto"))
	  {
	    fscanf(fi, "%d_%d_%s", &x, &y, s);
	    switch (s[0]) { case 'L': d = 0; break;
			  case 'R': d = 1; break;
			  case 'U': d = 2; break;
			  case 'D': d = 3; break; }
	    labelrefs[d * 2000 + y * 80 + x]++;
	  }
	}
	rewind(fi);
      }
      printf (".");
      if ((fo = fopen ("temp.c", "w")) != NULL)
      {
	while (!feof(fi))
	{
	  fgets(in, 255, fi);
	  if (sscanf(in, "_%d_%d_%s:  goto _%d_%d_%s;\n", &x0, &y0, t, &x1, &y1, s))
	  {
	    switch (s[0]) { case 'L': d = 0; break;
			  case 'R': d = 1; break;
			  case 'U': d = 2; break;
			  case 'D': d = 3; break; }
	    if (labelrefs[d * 2000 + y1 * 80 + x1])
	    {
	      fprintf(fo, "_%2.2d_%2.2d_%s ", x0, y0, t);
	      fprintf(fo, "goto _%2.2d_%2.2d_%s;\n", x1, y1, s);
	    }
	  } else
	  {
	    fprintf(fo, "%s", in);
	  }
	}
      }
      fclose (fi);
      fclose (fo);
      if ((fi = fopen ("temp.c", "r")) != NULL)
      {
	if ((fo = fopen (argv[argc - 1], "w")) != NULL)
	{
	  while (!feof(fi))
	  {
	    fgets(in, 255, fi);
	    fprintf(fo, "%s", in);
	  }
	}
      }
      printf (".");
    }
    printf ("done.\n");
  }
  return 0;
}

/* END of bef2c.c */