Brainfuck interpreter

bfrun.c

// Brainfuck interpreter

#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>

char m[30720] = {0}, *f = NULL;
int p = 0;

void dnth() {}
void iptr() {p++;}
void dptr() {p--;}
void ival() {m[p]++;}
void dval() {m[p]--;}
void vout() {putchar(m[p]);}
void vinp() {m[p] = getchar();}
void jfwd() {if(!m[p])while(*(f++)!=']');}
void jbwd() {if(m[p]){while(*(--f)!='[');f++;}}
void* j[256]={[0 ... 42]=dnth,[43]=ival,[44]=vinp,[45]=dval,[46]=vout,[47 ... 59]=dnth,[60]=dptr,[61]=dnth,[62]=iptr,[63 ... 90]=dnth,[91]=jfwd,[92]=dnth,[93]=jbwd,[94 ... 255]=dnth};

char* load(const char *fn) { 
	FILE *fp = fopen(fn, "rb");
	if (!fp)
		exit(1);
	fseek(fp, 0, SEEK_END);
	int s = ftell(fp);
	rewind(fp);
	char* r = malloc(s + 1);
	if (fread(r, 1, s, fp) != s)
		exit(2); 
	fclose(fp);
	r[s] = 0;
	return r;
}

int main(int argc, char* argv[]) {
	f = load(argv[1]);
	while(*f)((void(*)())j[*(f++)])();
	putchar('\n');
}