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ITS#7030 fix overlay_insert() with specific index

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This commit is contained in:
Howard Chu 2011-08-25 20:51:30 -07:00
parent 1c476b302e
commit eae46d35d2
1 changed files with 19 additions and 25 deletions
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44
servers/slapd/backover.c
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@ -1229,38 +1229,32 @@ overlay_insert( BackendDB *be, slap_overinst *on2, slap_overinst ***prev,
on2->on_next = oi->oi_list;
oi->oi_list = on2;
} else {
int i;
slap_overinst *on, *otmp1 = NULL, *otmp2;
int i, novs;
slap_overinst *on, **prev;
/* Since the list is in reverse order and is singly linked,
* we reverse it to find the idx insertion point. Adding
* on overlay at a specific point should be a pretty
* we have to count the overlays and then insert backwards.
* Adding on overlay at a specific point should be a pretty
* infrequent occurrence.
*/
for ( on = oi->oi_list; on; on=otmp2 ) {
otmp2 = on->on_next;
on->on_next = otmp1;
otmp1 = on;
}
oi->oi_list = NULL;
novs = 0;
for ( on = oi->oi_list; on; on=on->on_next )
novs++;
if (idx > novs)
idx = 0;
else
idx = novs - idx;
/* advance to insertion point */
for ( i=0, on = otmp1; i<idx; i++ ) {
otmp1 = on->on_next;
on->on_next = oi->oi_list;
oi->oi_list = on;
prev = &oi->oi_list;
for ( i=0; i<idx; i++ ) {
on = *prev;
prev = &on->on_next;
}
/* insert */
on2->on_next = oi->oi_list;
oi->oi_list = on2;
if ( otmp1 ) {
*prev = &otmp1->on_next;
/* replace remainder of list */
for ( on=otmp1; on; on=otmp1 ) {
otmp1 = on->on_next;
on->on_next = oi->oi_list;
oi->oi_list = on;
}
}
on2->on_next = *prev;
*prev = on2;
}
}