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ruanhaishen
redis
Commits
4c5f0966
Commit
4c5f0966
authored
Mar 09, 2011
by
Pieter Noordhuis
Browse files
Helpers to move around in encoded sorted set
parent
63b7b7fb
Changes
1
Show whitespace changes
Inline
Side-by-side
src/t_zset.c
View file @
4c5f0966
...
...
@@ -454,6 +454,44 @@ unsigned int zzlLength(robj *zobj) {
return ziplistLen(zl)/2;
}
/* Move to next entry based on the values in eptr and sptr. Both are set to
* NULL when there is no next entry. */
void zzlNext(unsigned char *zl, unsigned char **eptr, unsigned char **sptr) {
unsigned char *_eptr, *_sptr;
redisAssert(*eptr != NULL && *sptr != NULL);
_eptr = ziplistNext(zl,*sptr);
if (_eptr != NULL) {
_sptr = ziplistNext(zl,_eptr);
redisAssert(_sptr != NULL);
} else {
/* No next entry. */
_sptr = NULL;
}
*eptr = _eptr;
*sptr = _sptr;
}
/* Move to the previous entry based on the values in eptr and sptr. Both are
* set to NULL when there is no next entry. */
void zzlPrev(unsigned char *zl, unsigned char **eptr, unsigned char **sptr) {
unsigned char *_eptr, *_sptr;
redisAssert(*eptr != NULL && *sptr != NULL);
_sptr = ziplistPrev(zl,*eptr);
if (_sptr != NULL) {
_eptr = ziplistPrev(zl,_sptr);
redisAssert(_eptr != NULL);
} else {
/* No previous entry. */
_eptr = NULL;
}
*eptr = _eptr;
*sptr = _sptr;
}
/* Returns if there is a part of the zset is in range. Should only be used
* internally by zzlFirstInRange and zzlLastInRange. */
int zzlIsInRange(unsigned char *zl, zrangespec *range) {
...
...
@@ -1218,35 +1256,24 @@ void zrangeGenericCommand(redisClient *c, int reverse) {
else
eptr = ziplistIndex(zl,2*start);
while
(
rangelen
--
)
{
redisAssert(eptr != NULL);
sptr = ziplistNext(zl,eptr);
while (rangelen--) {
redisAssert(eptr != NULL && sptr != NULL);
redisAssert(ziplistGet(eptr,&vstr,&vlen,&vlong));
if (vstr == NULL)
addReplyBulkLongLong(c,vlong);
else
addReplyBulkCBuffer(c,vstr,vlen);
if
(
withscores
)
{
sptr
=
ziplistNext
(
zl
,
eptr
);
redisAssert
(
sptr
!=
NULL
);
if (withscores)
addReplyDouble(c,zzlGetScore(sptr));
}
if
(
reverse
)
{
/* Move to previous element by moving to the score of previous
* element. When NULL, we know there also is no element. */
sptr
=
ziplistPrev
(
zl
,
eptr
);
if
(
sptr
!=
NULL
)
{
eptr
=
ziplistPrev
(
zl
,
sptr
);
redisAssert
(
eptr
!=
NULL
);
}
else
{
eptr
=
NULL
;
}
}
else
{
sptr
=
ziplistNext
(
zl
,
eptr
);
redisAssert
(
sptr
!=
NULL
);
eptr
=
ziplistNext
(
zl
,
sptr
);
}
if (reverse)
zzlPrev(zl,&eptr,&sptr);
else
zzlNext(zl,&eptr,&sptr);
}
} else if (zobj->encoding == REDIS_ENCODING_RAW) {
...
...
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