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Change the definition of SQLITE_CONFIG_PAGECACHE and

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SQLITE_CONFIG_SCRATCH to omit the magic "+4" in the buffer size
calculation. (CVS 5512)

FossilOrigin-Name: e7ed0fe640a39053009eac52a7f055b121750e57
This commit is contained in:
drh
2008-07-31 17:16:05 +00:00
parent 2462e32246
commit 0a60a384e7
5 changed files with 31 additions and 21 deletions
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10
src/malloc.c
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@@ -12,7 +12,7 @@
**
** Memory allocation functions used throughout sqlite.
**
** $Id: malloc.c,v 1.31 2008/07/29 14:29:07 drh Exp $
** $Id: malloc.c,v 1.32 2008/07/31 17:16:05 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
@@ -115,6 +115,7 @@ int sqlite3MallocInit(void){
if( sqlite3Config.pScratch && sqlite3Config.szScratch>=3000
&& sqlite3Config.nScratch>0 ){
int i;
sqlite3Config.szScratch -= 4;
mem0.aScratchFree = (u32*)&((char*)sqlite3Config.pScratch)
[sqlite3Config.szScratch*sqlite3Config.nScratch];
for(i=0; i<sqlite3Config.nScratch; i++){ mem0.aScratchFree[i] = i; }
@@ -124,8 +125,13 @@ int sqlite3MallocInit(void){
sqlite3Config.szScratch = 0;
}
if( sqlite3Config.pPage && sqlite3Config.szPage>=512
&& sqlite3Config.nPage>0 ){
&& sqlite3Config.nPage>1 ){
int i;
int overhead;
int sz = sqlite3Config.szPage;
int n = sqlite3Config.nPage;
overhead = (4*n + sz - 1)/sz;
sqlite3Config.nPage -= overhead;
mem0.aPageFree = (u32*)&((char*)sqlite3Config.pPage)
[sqlite3Config.szPage*sqlite3Config.nPage];
for(i=0; i<sqlite3Config.nPage; i++){ mem0.aPageFree[i] = i; }