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features: Add function to unset a featurebit

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Needed so we can blank optional bits when comparing channel_types.
This commit is contained in:
Christian Decker
2022-04-15 14:24:09 +02:00
parent 695a98e5d8
commit a07797c166
2 changed files with 13 additions and 0 deletions
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11
common/features.c
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@@ -516,6 +516,17 @@ u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES)
return result; return result;
} }
void featurebits_unset(u8 **ptr, size_t bit)
{
size_t len = tal_count(*ptr);
if (bit / 8 >= len)
return;
(*ptr)[len - 1 - bit / 8] &= (0 << (bit % 8));
trim_features(ptr);
}
bool featurebits_eq(const u8 *f1, const u8 *f2) bool featurebits_eq(const u8 *f1, const u8 *f2)
{ {
size_t len = tal_bytelen(f1); size_t len = tal_bytelen(f1);

2
common/features.h
View File

@@ -73,6 +73,8 @@ void set_feature_bit(u8 **ptr, u32 bit);
/* Given two featurebit vectors, combine them by applying a logical OR. */ /* Given two featurebit vectors, combine them by applying a logical OR. */
u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES); u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES);
/* Unset a given bit in a featurebits string */
void featurebits_unset(u8 **ptr, size_t bit);
/* Are these two feature bitsets functionally equal (one may have /* Are these two feature bitsets functionally equal (one may have
* trailing zeroes)? */ * trailing zeroes)? */