SQLite

Check-in [5ba880dde8]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Simplifications and comment enhancements on btree.c. (CVS 6925)
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 5ba880dde8a219543ced6f792c7f9ecdcd8c1cbb
User & Date: drh 2009-07-23 01:44:00.000
Context
2009-07-24
12:35
Simplifications and comment improvements in pager.c. (CVS 6926) (check-in: 2d2f42ca0a user: drh tags: trunk)
2009-07-23
01:44
Simplifications and comment enhancements on btree.c. (CVS 6925) (check-in: 5ba880dde8 user: drh tags: trunk)
2009-07-22
18:24
Modify mksqlite3c.tcl so that it inserts SQLITE_API macros into sqlite3.h. Ticket #3983. (CVS 6924) (check-in: 803ec79f3b user: danielk1977 tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/btree.c.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/*
** 2004 April 6
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.700 2009/07/22 18:07:41 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
** Including a description of file format and an overview of operation.
*/
#include "btreeInt.h"












|







1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/*
** 2004 April 6
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.701 2009/07/23 01:44:00 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
** Including a description of file format and an overview of operation.
*/
#include "btreeInt.h"

2311
2312
2313
2314
2315
2316
2317

2318
2319
2320
2321
2322
2323
2324
2325
2326
2327



2328
2329
2330
2331
2332
2333
2334
2335
2336
    assert( pBt->pPage1->aData );
    releasePage(pBt->pPage1);
    pBt->pPage1 = 0;
  }
}

/*

** Create a new database by initializing the first page of the
** file.
*/
static int newDatabase(BtShared *pBt){
  MemPage *pP1;
  unsigned char *data;
  int rc;
  int nPage;

  assert( sqlite3_mutex_held(pBt->mutex) );



  rc = sqlite3PagerPagecount(pBt->pPager, &nPage);
  if( rc!=SQLITE_OK || nPage>0 ){
    return rc;
  }
  pP1 = pBt->pPage1;
  assert( pP1!=0 );
  data = pP1->aData;
  rc = sqlite3PagerWrite(pP1->pDbPage);
  if( rc ) return rc;







>
|
|








>
>
>

|







2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
    assert( pBt->pPage1->aData );
    releasePage(pBt->pPage1);
    pBt->pPage1 = 0;
  }
}

/*
** If pBt points to an empty file then convert that empty file
** into a new empty database by initializing the first page of
** the database.
*/
static int newDatabase(BtShared *pBt){
  MemPage *pP1;
  unsigned char *data;
  int rc;
  int nPage;

  assert( sqlite3_mutex_held(pBt->mutex) );
  /* The database size has already been measured and cached, so failure
  ** is impossible here.  If the original size measurement failed, then
  ** processing aborts before entering this routine. */
  rc = sqlite3PagerPagecount(pBt->pPager, &nPage);
  if( NEVER(rc!=SQLITE_OK) || nPage>0 ){
    return rc;
  }
  pP1 = pBt->pPage1;
  assert( pP1!=0 );
  data = pP1->aData;
  rc = sqlite3PagerWrite(pP1->pDbPage);
  if( rc ) return rc;