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modify idl_search to use binary search algorithm

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This commit is contained in:
Kurt Zeilenga 2000-09-21 01:56:10 +00:00
parent 4830b23b9d
commit 101ec9c57f
1 changed files with 31 additions and 8 deletions
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39
servers/slapd/back-bdb/idl.c
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@ -20,19 +20,42 @@
#define BDB_IS_ALLIDS(ids) ((ids)[0] == NOID)
#define IDL_CMP(x,y) ( x < y ? -1 : ( x > y ? 1 : 0 ) )
static int idl_search( ID *ids, ID id )
{
/* we should replace this a binary search as ids is sorted */
int i;
int n = (int) ids[0];
/*
* binary search of id in ids
* if found, returns position of id
* if not found, returns first postion greater than id
*/
int base = 0;
int cursor;
int val;
int n = ids[0];
for( i = 1; i <= n; i++ ) {
if( id <= ids[i] ) {
return i;
while( 0 < n ) {
int pivot = n >> 1;
cursor = base + pivot;
val = IDL_CMP( id, ids[cursor + 1] );
if( val < 0 ) {
n = pivot;
} else if ( val > 0 ) {
base = cursor + 1;
n -= pivot + 1;
} else {
return cursor + 1;
}
}
return 0;
if( val < 0 ) {
return cursor + 1;
} else {
return cursor + 2;
}
}
static int idl_insert( ID *ids, ID id )