/********************************************************************
bef2c.c - Befunge-93 to ANSI C Compiler in ANSI C
Copyright (c)1997-2018, Chris Pressey, 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
notices, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright
notices, this list of conditions, and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
Neither the names of the copyright holders nor the names of their
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 HOLDERS 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 [-O] [-w width] [-h height] <befunge-source> <c-destination>
-O : enable [buggy] post-optimization phase
-w : explicit width
-h : explicit height
Known to Compile Under :
gcc 5.4.0 (Ubuntu 16.04)
gcc 4.5.3 (NetBSD 6.1.5)
DJGPP 2.05 gcc 8.1.0 (32-bit Protected-Mode, FreeDOS 1.1)
Borland C++ v3.1 (16-bit, FreeDOS 1.1)
Microsoft Visual C++ 14.15 (see NMakefile)
Has, in the Past, been Known to Compile Under:
Metrowerks CodeWarrior (MacOS)
******************************************************************
History:
v1.0: Sep 2018, Chris Pressey
fixes submitted by https://github.com/serprex (thanks!):
- avoid double free due to double fclose
- handle trampoline at leftmost/topmost edges
- don't load NULs into playfield
- use %% instead of %c with '%' being passed in
- avoid freeing fo/fi on failure to open
removed -p flag as it is equivalent to
`-w 80 -h 25`, just use that instead
replaced -o (disable post-optimization) flag
with -O (enable post-optimization) because buggy
show usage and exit if unrecognized command-line
options are given
exit with a non-zero exit code if an error occurs
when detecing pageheight, add one on the assumption
that the source does not end with a newline
(this lets some existing example programs compile)
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 Metrowerks 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 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 : (y-2+pageheight)))
#define x_2right (x+2)%linewidth
#define x_2left ((x>1) ? x-2 : ((linewidth-2)<0 ? 0 : (x-2+linewidth)))
#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 post_optimize = 0; /* flag: optimize after compile? */
int labelrefs[8000]; /* postoptimization table */
char s[255];
char t[255];
/********************************************************* PROTOTYPES */
void usage(char *);
int main (int, char **);
/********************************************************** FUNCTIONS */
void usage(char *e)
{
printf ("USAGE : %s [-O] [-w width] [-h height] <befunge-source> <c-destination>\n", e);
exit (1);
}
/******************************************************* 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 v1.0\n");
if (argc < 3) usage(argv[0]);
for (i = 1; i < argc; i++)
{
if (argv[i][0] == '-')
{
if (!strcmp(argv[i], "-O")) { post_optimize = 1; }
else if (!strcmp(argv[i], "-w")) { linewidth = atoi(argv[i+1]); }
else if (!strcmp(argv[i], "-h")) { pageheight = atoi(argv[i+1]); }
else usage(argv[0]);
}
}
if ((fi = fopen (argv[argc - 2], "r")) != NULL) /*** Input Phase */
{
int x = 0, y = 0;
while (!feof (fi))
{
int ch = fgetc (fi);
if (ch == -1) break;
if (ch == '\n')
{
x = 0;
y++;
if (y >= 25) break;
else if (y > pageheight) pageheight=y;
} else
{
cur = ch;
x++;
if (x >= 80)
{
x = 0;
y++;
if (y >= 25) break;
else if (y > pageheight) pageheight=y;
} else if (x > linewidth)
{
linewidth = x;
}
}
}
} else
{
printf ("Error : couldn't open '%s' for input.\n", argv[argc - 1]);
exit (1);
}
/* Most Befunge-93 sources do not end with a newline. Therefore: */
if (pageheight < 25) pageheight++;
if (!(fo = fopen (argv[argc - 1], "w"))) /*** Output */
{
printf ("Error : couldn't open '%s' for output.\n", argv[argc - 1]);
exit (1);
}
printf ("Loaded %d columns by %d rows.\n", linewidth, pageheight);
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]=%d;\n", y * 80 + x, 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%%a);");
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,\"%%ld \",pop());fflush(stdout); goto " RIGHT ";\n", x, y, x_right, y);
fprintf(fo, LEFT ": fprintf(stdout,\"%%ld \",pop());fflush(stdout); goto " LEFT ";\n", x, y, x_left, y);
fprintf(fo, UP ": fprintf(stdout,\"%%ld \",pop());fflush(stdout); goto " UP ";\n", x, y, x, y_up);
fprintf(fo, DOWN ": fprintf(stdout,\"%%ld \",pop());fflush(stdout); goto " DOWN ";\n", x, y, x, y_down);
break;
case ',':
fprintf(fo, RIGHT ": fprintf(stdout,\"%%c\",pop());fflush(stdout); goto " RIGHT ";\n", x, y, x_right, y);
fprintf(fo, LEFT ": fprintf(stdout,\"%%c\",pop());fflush(stdout); goto " LEFT ";\n", x, y, x_left, y);
fprintf(fo, UP ": fprintf(stdout,\"%%c\",pop());fflush(stdout); goto " UP ";\n", x, y, x, y_up);
fprintf(fo, DOWN ": fprintf(stdout,\"%%c\",pop());fflush(stdout); goto " DOWN ";\n", x, y, x, y_down);
break;
case '&':
fprintf(fo, RIGHT ": fscanf(stdin,\"%%ld\",&b);push(b); goto " RIGHT ";\n", x, y, x_right, y);
fprintf(fo, LEFT ": fscanf(stdin,\"%%ld\",&b);push(b); goto " LEFT ";\n", x, y, x_left, y);
fprintf(fo, UP ": fscanf(stdin,\"%%ld\",&b);push(b); goto " UP ";\n", x, y, x, y_up);
fprintf(fo, DOWN ": fscanf(stdin,\"%%ld\",&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) %% 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);
}
}
}
if (fi) fclose (fi);
if (fo) 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 */