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Fix hashcmp() to handle special case of zero length, which

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resulted in the hostname cache being ineffective. Based on
patch from Jeremy Cole of Yahoo! (Bug #10931)
This commit is contained in:
jimw@mysql.com 2005-06-01 11:30:59 -07:00
parent e877e71b17
commit 24f14c93cf
1 changed files with 20 additions and 2 deletions
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22
mysys/hash.c
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@ -262,7 +262,25 @@ static void movelink(HASH_LINK *array,uint find,uint next_link,uint newlink)
return;
}
/* Compare a key in a record to a whole key. Return 0 if identical */
/*
Compare a key in a record to a whole key. Return 0 if identical
SYNOPSIS
hashcmp()
hash hash table
pos position of hash record to use in comparison
key key for comparison
length length of key
NOTES:
If length is 0, comparison is done using the length of the
record being compared against.
RETURN
< 0 key of record < key
= 0 key of record == key
> 0 key of record > key
*/
static int hashcmp(HASH *hash,HASH_LINK *pos,const byte *key,uint length)
{
@ -270,7 +288,7 @@ static int hashcmp(HASH *hash,HASH_LINK *pos,const byte *key,uint length)
byte *rec_key= (byte*) hash_key(hash,pos->data,&rec_keylength,1);
return ((length && length != rec_keylength) ||
my_strnncoll(hash->charset, (uchar*) rec_key, rec_keylength,
(uchar*) key, length));
(uchar*) key, rec_keylength));
}