static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
{
	char c, *eq;
	int len;

	if (*arg != '-')
		return 0;
	c = *++arg;
	if (!c)
		return 0;
	if (c == arg_short) {
		c = *++arg;
		if (!c)
			return 1;
		if (val && isdigit(c)) {
			char *end;
			int n = strtoul(arg, &end, 10);
			if (*end)
				return 0;
			*val = n;
			return 1;
		}
		return 0;
	}
	if (c != '-')
		return 0;
	arg++;
	eq = strchr(arg, '=');
	if (eq)
		len = eq - arg;
	else
		len = strlen(arg);
	if (!len || strncmp(arg, arg_long, len))
		return 0;
	if (eq) {
		int n;
		char *end;
		if (!isdigit(*++eq))
			return 0;
		n = strtoul(eq, &end, 10);
		if (*end)
			return 0;
		*val = n;
	}
	return 1;
}
Unknown