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brainfuck.c
executable file
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brainfuck.c
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/* This is the brainfuck 'backend'. It does all the interpretation :) */
#include <stdio.h>
#include <string.h>
#ifndef BRAINFUCK_H
#include "brainfuck.h"
#endif
#define MAX_CELLS 65536
void brainfuck_eval(char chars[]) {
char c;
int pointer = 0;
int char_pointer = 0;
int loop = 0;
int tape[MAX_CELLS];
/* Loop through all character in the character array */
while (char_pointer++ < strlen(chars)) {
switch (chars[char_pointer]) {
case '>':
pointer++;
break;
case '<':
pointer--;
break;
case '+':
tape[pointer]++;
break;
case '-':
tape[pointer]--;
break;
case '.':
putchar(tape[pointer]);
break;
case ',':
tape[pointer] = (int) getchar();
break;
case '[':
if (tape[pointer] == 0) {
loop = 1;
while (loop > 0) {
c = chars[++char_pointer];
if (c == '[')
loop++;
else if (c == ']')
loop--;
}
}
break;
case ']':
loop = 1;
while (loop > 0) {
c = chars[--char_pointer];
if (c == '[')
loop--;
else if (c == ']')
loop++;
}
char_pointer--;
break;
}
}
putchar(10);
}