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lib: clarify usage of prefix_bit function

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"prefixlen" is really a bit index

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2020-06-22 13:59:01 -04:00
parent a5e81e0367
commit adeb067232
2 changed files with 13 additions and 5 deletions
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6
lib/prefix.c
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@ -75,10 +75,10 @@ bool is_mcast_mac(const struct ethaddr *mac)
return false; return false;
} }
unsigned int prefix_bit(const uint8_t *prefix, const uint16_t prefixlen) unsigned int prefix_bit(const uint8_t *prefix, const uint16_t bit_index)
{ {
unsigned int offset = prefixlen / 8; unsigned int offset = bit_index / 8;
unsigned int shift = 7 - (prefixlen % 8); unsigned int shift = 7 - (bit_index % 8);
return (prefix[offset] >> shift) & 1; return (prefix[offset] >> shift) & 1;
} }

12
lib/prefix.h
View File

@ -392,8 +392,16 @@ extern const char *family2str(int family);
extern const char *safi2str(safi_t safi); extern const char *safi2str(safi_t safi);
extern const char *afi2str(afi_t afi); extern const char *afi2str(afi_t afi);
/* Check bit of the prefix. */ /*
extern unsigned int prefix_bit(const uint8_t *prefix, const uint16_t prefixlen); * Check bit of the prefix.
*
* prefix
* byte buffer
*
* bit_index
* which bit to fetch from byte buffer, 0 indexed.
*/
extern unsigned int prefix_bit(const uint8_t *prefix, const uint16_t bit_index);
extern struct prefix *prefix_new(void); extern struct prefix *prefix_new(void);
extern void prefix_free(struct prefix **p); extern void prefix_free(struct prefix **p);