int spk_set_key_info()

in speakup/main.c [1219:1269]

• 49 lines of code
• 7 McCabe index (conditional complexity)

int spk_set_key_info(const u_char *key_info, u_char *k_buffer)
{
	int i = 0, states, key_data_len;
	const u_char *cp = key_info;
	u_char *cp1 = k_buffer;
	u_char ch, version, num_keys;

	version = *cp++;
	if (version != KEY_MAP_VER) {
		pr_debug("version found %d should be %d\n",
			 version, KEY_MAP_VER);
		return -EINVAL;
	}
	num_keys = *cp;
	states = (int)cp[1];
	key_data_len = (states + 1) * (num_keys + 1);
	if (key_data_len + SHIFT_TBL_SIZE + 4 >= sizeof(spk_key_buf)) {
		pr_debug("too many key_infos (%d over %u)\n",
			 key_data_len + SHIFT_TBL_SIZE + 4,
			 (unsigned int)(sizeof(spk_key_buf)));
		return -EINVAL;
	}
	memset(k_buffer, 0, SHIFT_TBL_SIZE);
	memset(spk_our_keys, 0, sizeof(spk_our_keys));
	spk_shift_table = k_buffer;
	spk_our_keys[0] = spk_shift_table;
	cp1 += SHIFT_TBL_SIZE;
	memcpy(cp1, cp, key_data_len + 3);
	/* get num_keys, states and data */
	cp1 += 2;		/* now pointing at shift states */
	for (i = 1; i <= states; i++) {
		ch = *cp1++;
		if (ch >= SHIFT_TBL_SIZE) {
			pr_debug("(%d) not valid shift state (max_allowed = %d)\n",
				 ch, SHIFT_TBL_SIZE);
			return -EINVAL;
		}
		spk_shift_table[ch] = i;
	}
	keymap_flags = *cp1++;
	while ((ch = *cp1)) {
		if (ch >= MAX_KEY) {
			pr_debug("(%d), not valid key, (max_allowed = %d)\n",
				 ch, MAX_KEY);
			return -EINVAL;
		}
		spk_our_keys[ch] = cp1;
		cp1 += states + 1;
	}
	return 0;
}