-/* idl.c - ldap bdb back-end ID list functions */
+/** @file midl.c
+ * @brief ldap bdb back-end ID List functions */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
- * Copyright 2000-2011 The OpenLDAP Foundation.
+ * Copyright 2000-2012 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* <http://www.OpenLDAP.org/license.html>.
*/
+#include <limits.h>
#include <string.h>
+#include <stdlib.h>
#include <sys/types.h>
#include <assert.h>
#include "midl.h"
-typedef unsigned long pgno_t;
-
-/* Sort the IDLs from highest to lowest */
-#define IDL_CMP(x,y) ( x > y ? -1 : ( x < y ? 1 : 0 ) )
+/** @defgroup internal MDB Internals
+ * @{
+ */
+/** @defgroup idls ID List Management
+ * @{
+ */
+#define CMP(x,y) ( (x) < (y) ? -1 : (x) > (y) )
-unsigned mdb_midl_search( ID *ids, ID id )
+#if 0 /* superseded by append/sort */
+static unsigned mdb_midl_search( IDL ids, ID id )
{
/*
* binary search of id in ids
* if not found, returns first position greater than id
*/
unsigned base = 0;
- unsigned cursor = 0;
+ unsigned cursor = 1;
int val = 0;
unsigned n = ids[0];
while( 0 < n ) {
- int pivot = n >> 1;
- cursor = base + pivot;
- val = IDL_CMP( id, ids[cursor + 1] );
+ unsigned pivot = n >> 1;
+ cursor = base + pivot + 1;
+ val = CMP( ids[cursor], id );
if( val < 0 ) {
n = pivot;
} else if ( val > 0 ) {
- base = cursor + 1;
+ base = cursor;
n -= pivot + 1;
} else {
- return cursor + 1;
+ return cursor;
}
}
if( val > 0 ) {
- return cursor + 2;
- } else {
- return cursor + 1;
+ ++cursor;
}
+ return cursor;
}
-int mdb_midl_insert( ID *ids, ID id )
+int mdb_midl_insert( IDL ids, ID id )
{
- unsigned x;
+ unsigned x, i;
if (MDB_IDL_IS_RANGE( ids )) {
/* if already in range, treat as a dup */
- if (id >= MDB_IDL_FIRST(ids) && id <= MDB_IDL_LAST(ids))
+ if (id >= MDB_IDL_RANGE_FIRST(ids) && id <= MDB_IDL_RANGE_LAST(ids))
return -1;
- if (id < MDB_IDL_FIRST(ids))
+ if (id < MDB_IDL_RANGE_FIRST(ids))
ids[1] = id;
- else if (id > MDB_IDL_LAST(ids))
+ else if (id > MDB_IDL_RANGE_LAST(ids))
ids[2] = id;
return 0;
}
if ( x <= ids[0] && ids[x] == id ) {
/* duplicate */
+ assert(0);
return -1;
}
} else {
/* insert id */
- AC_MEMCPY( &ids[x+1], &ids[x], (ids[0]-x) * sizeof(ID) );
+ for (i=ids[0]; i>x; i--)
+ ids[i] = ids[i-1];
ids[x] = id;
}
return 0;
}
+#endif
+
+IDL mdb_midl_alloc()
+{
+ IDL ids = malloc((MDB_IDL_UM_MAX+1) * sizeof(ID));
+ *ids++ = MDB_IDL_UM_MAX;
+ return ids;
+}
+
+void mdb_midl_free(IDL ids)
+{
+ free(ids-1);
+}
+
+int mdb_midl_shrink( IDL *idp )
+{
+ IDL ids = *idp;
+ if (ids[-1] > MDB_IDL_UM_MAX) {
+ ids = realloc(ids, (MDB_IDL_UM_MAX+1) * sizeof(ID));
+ *ids++ = MDB_IDL_UM_MAX;
+ *idp = ids;
+ return 1;
+ }
+ return 0;
+}
+
+int mdb_midl_append( IDL *idp, ID id )
+{
+ IDL ids = *idp;
+ /* Too big? */
+ if (ids[0] >= ids[-1]) {
+ IDL idn = ids-1;
+ /* grow it */
+ idn = realloc(idn, (*idn + MDB_IDL_UM_MAX + 1) * sizeof(ID));
+ if (!idn)
+ return -1;
+ *idn++ += MDB_IDL_UM_MAX;
+ ids = idn;
+ *idp = ids;
+ }
+ ids[0]++;
+ ids[ids[0]] = id;
+ return 0;
+}
+
+int mdb_midl_append_list( IDL *idp, IDL app )
+{
+ IDL ids = *idp;
+ /* Too big? */
+ if (ids[0] + app[0] >= ids[-1]) {
+ IDL idn = ids-1;
+ /* grow it */
+ idn = realloc(idn, (*idn + app[-1]) * sizeof(ID));
+ if (!idn)
+ return -1;
+ *idn++ += app[-1];
+ ids = idn;
+ *idp = ids;
+ }
+ memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(ID));
+ ids[0] += app[0];
+ return 0;
+}
+
+/* Quicksort + Insertion sort for small arrays */
+
+#define SMALL 8
+#define SWAP(a,b) { itmp=(a); (a)=(b); (b)=itmp; }
+
+void
+mdb_midl_sort( IDL ids )
+{
+ /* Max possible depth of int-indexed tree * 2 items/level */
+ int istack[sizeof(int)*CHAR_BIT * 2];
+ int i,j,k,l,ir,jstack;
+ ID a, itmp;
+
+ ir = ids[0];
+ l = 1;
+ jstack = 0;
+ for(;;) {
+ if (ir - l < SMALL) { /* Insertion sort */
+ for (j=l+1;j<=ir;j++) {
+ a = ids[j];
+ for (i=j-1;i>=1;i--) {
+ if (ids[i] >= a) break;
+ ids[i+1] = ids[i];
+ }
+ ids[i+1] = a;
+ }
+ if (jstack == 0) break;
+ ir = istack[jstack--];
+ l = istack[jstack--];
+ } else {
+ k = (l + ir) >> 1; /* Choose median of left, center, right */
+ SWAP(ids[k], ids[l+1]);
+ if (ids[l] < ids[ir]) {
+ SWAP(ids[l], ids[ir]);
+ }
+ if (ids[l+1] < ids[ir]) {
+ SWAP(ids[l+1], ids[ir]);
+ }
+ if (ids[l] < ids[l+1]) {
+ SWAP(ids[l], ids[l+1]);
+ }
+ i = l+1;
+ j = ir;
+ a = ids[l+1];
+ for(;;) {
+ do i++; while(ids[i] > a);
+ do j--; while(ids[j] < a);
+ if (j < i) break;
+ SWAP(ids[i],ids[j]);
+ }
+ ids[l+1] = ids[j];
+ ids[j] = a;
+ jstack += 2;
+ if (ir-i+1 >= j-1) {
+ istack[jstack] = ir;
+ istack[jstack-1] = i;
+ ir = j-1;
+ } else {
+ istack[jstack] = j-1;
+ istack[jstack-1] = l;
+ l = i;
+ }
+ }
+ }
+}
+
+unsigned mdb_mid2l_search( ID2L ids, ID id )
+{
+ /*
+ * binary search of id in ids
+ * if found, returns position of id
+ * if not found, returns first position greater than id
+ */
+ unsigned base = 0;
+ unsigned cursor = 1;
+ int val = 0;
+ unsigned n = ids[0].mid;
+
+ while( 0 < n ) {
+ unsigned pivot = n >> 1;
+ cursor = base + pivot + 1;
+ val = CMP( id, ids[cursor].mid );
+
+ if( val < 0 ) {
+ n = pivot;
+
+ } else if ( val > 0 ) {
+ base = cursor;
+ n -= pivot + 1;
+
+ } else {
+ return cursor;
+ }
+ }
+
+ if( val > 0 ) {
+ ++cursor;
+ }
+ return cursor;
+}
+
+int mdb_mid2l_insert( ID2L ids, ID2 *id )
+{
+ unsigned x, i;
+
+ x = mdb_mid2l_search( ids, id->mid );
+ assert( x > 0 );
+
+ if( x < 1 ) {
+ /* internal error */
+ return -2;
+ }
+
+ if ( x <= ids[0].mid && ids[x].mid == id->mid ) {
+ /* duplicate */
+ return -1;
+ }
+
+ if ( ids[0].mid >= MDB_IDL_UM_MAX ) {
+ /* too big */
+ return -2;
+
+ } else {
+ /* insert id */
+ ids[0].mid++;
+ for (i=ids[0].mid; i>x; i--)
+ ids[i] = ids[i-1];
+ ids[x] = *id;
+ }
+
+ return 0;
+}
+/** @} */
+/** @} */
projects / openldap / blobdiff