Function get_agreed_channelfeatures

common/features.c:316–340

BOLT #7: * * - MUST set `features` based on what features were negotiated for this channel, according to [BOLT #9](09-features.md#assigned-features-flags) * - MUST set `len` to the minimum length required to hold the `features` bits * it sets. */

 *  it sets.
 */
u8 *get_agreed_channelfeatures(const tal_t *ctx,
			       const struct feature_set *our_features,
			       const u8 *their_features)
{
	u8 *f = tal_dup_talarr(ctx, u8, our_features->bits[CHANNEL_FEATURE]);
	size_t max_len = 0;

	/* Clear any features which they didn't offer too */
	for (size_t i = 0; i < 8 * tal_count(f); i += 2) {
		if (!feature_offered(f, i))
			continue;
		if (!feature_offered(their_features, i)) {
			clear_feature_bit(f, COMPULSORY_FEATURE(i));
			clear_feature_bit(f, OPTIONAL_FEATURE(i));
			trim_features(&f);
			continue;
		}
		max_len = (i / 8) + 1;
	}

	/* Trim to length (unless it's already NULL). */
	if (f)
		tal_resize(&f, max_len);
	return f;
}

bool feature_is_set(const u8 *features, size_t bit)
{