STATIC uint8_t readmove(char);
STATIC uint8_t readmodifier(char);
STATIC int writemoves(uint8_t *, int, char *);

STATIC uint8_t
readmove(char c)
{
	switch (c) {
	case 'U':
		return MOVE_U;
	case 'D':
		return MOVE_D;
	case 'R':
		return MOVE_R;
	case 'L':
		return MOVE_L;
	case 'F':
		return MOVE_F;
	case 'B':
		return MOVE_B;
	default:
		return UINT8_ERROR;
	}
}

STATIC uint8_t
readmodifier(char c)
{
	switch (c) {
	case '1': /* Fallthrough */
	case '2': /* Fallthrough */
	case '3':
		return c - '0' - 1;
	case '\'':
		return 2;
	default:
		return 0;
	}
}

STATIC int
writemoves(uint8_t *m, int n, char *buf)
{
	int i;
	size_t len;
	const char *s;
	char *b;

	for (i = 0, b = buf; i < n; i++, b++) {
		s = movestr[m[i]];
		len = strlen(s);
		memcpy(b, s, len);
		b += len;	
		*b = ' ';
	}

	if (b != buf)
		b--; /* Remove last space */
	*b = '\0';

	return b - buf;
}