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ruanhaishen
redis
Commits
0f10458c
Commit
0f10458c
authored
May 21, 2010
by
Pieter Noordhuis
Browse files
allow entries to be deleted in place when iterating over a ziplist
parent
924727d9
Changes
1
Show whitespace changes
Inline
Side-by-side
ziplist.c
View file @
0f10458c
...
@@ -152,6 +152,27 @@ unsigned char *ziplistDeleteRange(unsigned char *zl, unsigned int index, unsigne
...
@@ -152,6 +152,27 @@ unsigned char *ziplistDeleteRange(unsigned char *zl, unsigned int index, unsigne
return
zl
;
return
zl
;
}
}
/* Delete a single entry from the ziplist, pointed to by *p.
* Also update *p in place, to be able to iterate over the
* ziplist, while deleting entries. */
unsigned
char
*
ziplistDelete
(
unsigned
char
*
zl
,
unsigned
char
**
p
)
{
unsigned
int
offset
=
*
p
-
zl
,
tail
,
len
;
len
=
zipRawEntryLength
(
*
p
);
tail
=
ZIPLIST_BYTES
(
zl
)
-
offset
-
len
-
1
;
/* Move current tail to the new tail when there *is* a tail */
if
(
tail
>
0
)
memmove
(
*
p
,
*
p
+
len
,
tail
);
/* Resize and update length */
zl
=
ziplistResize
(
zl
,
ZIPLIST_BYTES
(
zl
)
-
len
);
if
(
ZIPLIST_LENGTH
(
zl
)
<
ZIP_BIGLEN
)
ZIPLIST_LENGTH
(
zl
)
--
;
/* Store new pointer to current element in p.
* This needs to be done because zl can change on realloc. */
*
p
=
zl
+
offset
;
return
zl
;
}
void
ziplistRepr
(
unsigned
char
*
zl
)
{
void
ziplistRepr
(
unsigned
char
*
zl
)
{
unsigned
char
*
p
;
unsigned
char
*
p
;
unsigned
int
l
;
unsigned
int
l
;
...
@@ -180,7 +201,7 @@ unsigned char *createList() {
...
@@ -180,7 +201,7 @@ unsigned char *createList() {
}
}
int
main
(
int
argc
,
char
**
argv
)
{
int
main
(
int
argc
,
char
**
argv
)
{
unsigned
char
*
zl
,
*
p
,
*
entry
;
unsigned
char
*
zl
,
*
p
,
*
q
,
*
entry
;
unsigned
int
elen
;
unsigned
int
elen
;
sds
s
;
sds
s
;
...
@@ -278,6 +299,26 @@ int main(int argc, char **argv) {
...
@@ -278,6 +299,26 @@ int main(int argc, char **argv) {
ziplistRepr
(
zl
);
ziplistRepr
(
zl
);
}
}
printf
(
"Delete foo while iterating:
\n
"
);
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
0
);
while
((
p
=
ziplistNext
(
p
,
&
q
,
&
entry
,
&
elen
))
!=
NULL
)
{
if
(
strncmp
(
"foo"
,
entry
,
elen
)
==
0
)
{
printf
(
"Delete foo
\n
"
);
zl
=
ziplistDelete
(
zl
,
&
q
);
p
=
q
;
}
else
{
printf
(
"Entry: "
);
fwrite
(
entry
,
elen
,
1
,
stdout
);
printf
(
" (length %d)
\n
"
,
elen
);
}
}
printf
(
"
\n
"
);
ziplistRepr
(
zl
);
printf
(
"
\n
"
);
}
return
0
;
return
0
;
}
}
#endif
#endif
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