Created
October 29, 2011 16:16
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Brainfuck interpreter written in C
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| #include <stdio.h> | |
| #define match(from, to, ptr, dir, level) \ | |
| while(*(dir ptr)) { \ | |
| if (*ptr == to && level == 0) break; \ | |
| if (*ptr == from) ++level; \ | |
| if (*ptr == to) --level; \ | |
| } | |
| char code[32768] = {0}; | |
| char data[32768] = {0}; | |
| void exec() { | |
| char* pc = code; | |
| char* p = data;; | |
| int level = 0; | |
| int ch; | |
| while (*pc) { | |
| switch(*pc) { | |
| case '>': ++p; break; | |
| case '<': --p; break; | |
| case '+': ++*p; break; | |
| case '-': --*p; break; | |
| case '.': putchar(*p); break; | |
| case ',': *p = ((ch = getchar()) == EOF) ? 0 : ch; break; | |
| case '[': if (!*p) match('[', ']', pc, ++, level); break; | |
| case ']': if ( *p) match(']', '[', pc, --, level); break; | |
| default: break; | |
| } | |
| pc++; | |
| } | |
| } | |
| int main(int argc, const char *argv[]) { | |
| FILE* fp = fopen(argv[1], "r"); | |
| char* pc = code; | |
| int ch; | |
| while ((ch=fgetc(fp)) != EOF) { | |
| if (ch == '>' || ch == '<' || ch == '+' || ch == '-' || | |
| ch == '[' || ch == ']' || ch == '.' || ch == ',') | |
| *(pc++) = ch; | |
| } | |
| fclose(fp); | |
| exec(); | |
| return 0; | |
| } |
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