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ruanhaishen
redis
Commits
779deb60
Commit
779deb60
authored
May 21, 2010
by
Pieter Noordhuis
Browse files
code to delete an inner range from the ziplist
parent
33c1269e
Changes
1
Show whitespace changes
Inline
Side-by-side
ziplist.c
View file @
779deb60
...
@@ -130,6 +130,27 @@ unsigned char *ziplistNext(unsigned char *p, unsigned char **entry, unsigned int
...
@@ -130,6 +130,27 @@ unsigned char *ziplistNext(unsigned char *p, unsigned char **entry, unsigned int
return
p
;
return
p
;
}
}
/* Delete one or more entries from the ziplist. */
unsigned
char
*
ziplistDelete
(
unsigned
char
*
zl
,
unsigned
int
index
,
unsigned
int
num
)
{
unsigned
char
*
p
,
*
first
=
ziplistIndex
(
zl
,
index
);
unsigned
int
i
,
deleted
=
0
,
totlen
,
newlen
;
for
(
p
=
first
,
i
=
0
;
*
p
!=
ZIP_END
&&
i
<
num
;
i
++
)
{
p
+=
zipRawEntryLength
(
p
);
deleted
++
;
}
totlen
=
p
-
first
;
if
(
totlen
>
0
)
{
/* Move current tail to the new tail when there *is* a tail */
if
(
*
p
!=
ZIP_END
)
memmove
(
first
,
p
,
ZIPLIST_BYTES
(
zl
)
-
(
p
-
zl
)
-
1
);
/* Resize and update length */
zl
=
ziplistResize
(
zl
,
ZIPLIST_BYTES
(
zl
)
-
totlen
);
if
(
ZIPLIST_LENGTH
(
zl
)
<
ZIP_BIGLEN
)
ZIPLIST_LENGTH
(
zl
)
-=
deleted
;
}
return
zl
;
}
void
ziplistRepr
(
unsigned
char
*
zl
)
{
void
ziplistRepr
(
unsigned
char
*
zl
)
{
unsigned
char
*
p
;
unsigned
char
*
p
;
unsigned
int
l
;
unsigned
int
l
;
...
@@ -218,6 +239,42 @@ int main(int argc, char **argv) {
...
@@ -218,6 +239,42 @@ int main(int argc, char **argv) {
}
else
{
}
else
{
printf
(
"ERROR
\n
"
);
printf
(
"ERROR
\n
"
);
}
}
printf
(
"
\n
"
);
}
printf
(
"Delete inclusive range 0,0:
\n
"
);
{
zl
=
createList
();
zl
=
ziplistDelete
(
zl
,
0
,
1
);
ziplistRepr
(
zl
);
}
printf
(
"Delete inclusive range 0,1:
\n
"
);
{
zl
=
createList
();
zl
=
ziplistDelete
(
zl
,
0
,
2
);
ziplistRepr
(
zl
);
}
printf
(
"Delete inclusive range 1,2:
\n
"
);
{
zl
=
createList
();
zl
=
ziplistDelete
(
zl
,
1
,
2
);
ziplistRepr
(
zl
);
}
printf
(
"Delete with start index out of range:
\n
"
);
{
zl
=
createList
();
zl
=
ziplistDelete
(
zl
,
5
,
1
);
ziplistRepr
(
zl
);
}
printf
(
"Delete with num overflow:
\n
"
);
{
zl
=
createList
();
zl
=
ziplistDelete
(
zl
,
1
,
5
);
ziplistRepr
(
zl
);
}
}
return
0
;
return
0
;
...
...
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