float hum_to_float(const char *s) {
	// This function stolen from either Rolf Neugebauer or Andrew Tolmach.
	// Probably Rolf.
	float a = 0.0f;
	int e = 0;
	int c;
	float sign = 1;

	c = *s++;

	if(c == '-') {
		sign = -1;
		c = *s++;
	}

	while(c != '\0' && isdigit(c)) {
		a = a * 10.0f + (c - '0');
		c = *s++;
	}

	if(c == '.') {
		while((c = *s++) != '\0' && isdigit(c)) {
			a = a * 10.0f + (c - '0');
			e = e - 1;
		}
	}

	if(c <= 'z' && c >= 'E') {
		for(int i = 0; c != '\0'; i++) {
			if(c == prefix[i]){
				a *= prefix_xf[i];
				break;
			}
		}
	}

	while(e > 0) {
		a *= 10.0f;
		e--;
	}

	while(e < 0) {
		a *= 0.1f;
		e++;
	}

	return a * sign;
}