SQLite

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.209 2005/08/21 16:54:25 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

  if( pPager->dbSize>=0 ){
    return pPager->dbSize;
  }
  if( sqlite3OsFileSize(&pPager->fd, &n)!=SQLITE_OK ){
    pPager->errMask |= PAGER_ERR_DISK;
    return 0;
  }
  if( n>0 && n<pPager->pageSize ){
    n = 1;
  }else{
    n /= pPager->pageSize;
  }
  if( !MEMDB && n==PENDING_BYTE/pPager->pageSize ){
    n++;
  }
  if( pPager->state!=PAGER_UNLOCK ){
    pPager->dbSize = n;
  }
  return n;

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for miscellanous features that were
# left out of other test files.
#
# $Id: misc5.test,v 1.4 2005/08/21 16:54:25 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Build records using the MakeRecord opcode such that the size of the 
# header is at the transition point in the size of a varint.
#

        WHERE artist <> '' 
      )  
     )       
    )  
    ORDER BY LOWER(artist) ASC;
  }
} {two}

# Ticket #1370.  Do not overwrite small files (less than 1024 bytes)
# when trying to open them as a database.
#
do_test misc5-4.1 {
  db close
  file delete -force test.db
  set fd [open test.db w]
  puts $fd "This is not really a database"
  close $fd
  sqlite3 db test.db
  catchsql {
    CREATE TABLE t1(a,b,c);
  }
} {1 {file is encrypted or is not a database}}



finish_test