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Set p to its new offset before modifying it

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This commit is contained in:
Pieter Noordhuis 2012-08-13 12:39:49 -07:00
parent 5117c20ab5
commit 3cc2904e3e
1 changed files with 8 additions and 7 deletions
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15
src/ziplist.c
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@ -500,12 +500,13 @@ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsig
totlen = p-first.p;
if (totlen > 0) {
if (p[0] != ZIP_END) {
/* Tricky: storing the prevlen in this entry might reduce or
* increase the number of bytes needed, compared to the current
* prevlen. Note that we can always store this length because
* it was previously stored by an entry that is being deleted. */
/* Storing `prevrawlen` in this entry may increase or decrease the
* number of bytes required compare to the current `prevrawlen`.
* There always is room to store this, because it was previously
* stored by an entry that is now being deleted. */
nextdiff = zipPrevLenByteDiff(p,first.prevrawlen);
zipPrevEncodeLength(p-nextdiff,first.prevrawlen);
p -= nextdiff;
zipPrevEncodeLength(p,first.prevrawlen);
/* Update offset for tail */
ZIPLIST_TAIL_OFFSET(zl) =
@ -521,8 +522,8 @@ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsig
}
/* Move tail to the front of the ziplist */
memmove(first.p,p-nextdiff,
intrev32ifbe(ZIPLIST_BYTES(zl))-(p-zl)-1+nextdiff);
memmove(first.p,p,
intrev32ifbe(ZIPLIST_BYTES(zl))-(p-zl)-1);
} else {
/* The entire tail was deleted. No need to move memory. */
ZIPLIST_TAIL_OFFSET(zl) =