SQLite

/*
** 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 1.608 2009/05/06 18:57:10 shane 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"

  /* The minimum size of any cell is 4 bytes. */
  if( nSize<4 ){
    nSize = 4;
  }

  assert( nSize==debuginfo.nSize );
  return (u16)nSize;
}
#ifndef NDEBUG
static u16 cellSize(MemPage *pPage, int iCell){
  return cellSizePtr(pPage, findCell(pPage, iCell));
}
#endif

          /* The record flows over onto one or more overflow pages. In
          ** this case the whole cell needs to be parsed, a buffer allocated
          ** and accessPayload() used to retrieve the record into the
          ** buffer before VdbeRecordCompare() can be called. */
          void *pCellKey;
          u8 * const pCellBody = pCell - pPage->childPtrSize;
          sqlite3BtreeParseCellPtr(pPage, pCellBody, &pCur->info);
          nCell = (int)pCur->info.nKey;
          pCellKey = sqlite3Malloc( nCell );
          if( pCellKey==0 ){
            rc = SQLITE_NOMEM;
            goto moveto_finish;
          }
          rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 0, 0);
          c = sqlite3VdbeRecordCompare(nCell, pCellKey, pIdxKey);

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.432 2009/05/06 18:57:10 shane Exp $
*/
#include "sqliteInt.h"

/*
** Return the 'affinity' of the expression pExpr if any.
**
** If pExpr is a column, a reference to a column via an 'AS' alias,

    assert( pToken->dyn==0 );
    pNew->span = *pToken;
    if( pToken->n>=2 
         && ((c = pToken->z[0])=='\'' || c=='"' || c=='[' || c=='`') ){
      sqlite3TokenCopy(db, &pNew->token, pToken);
      if( pNew->token.z ){
        pNew->token.n = sqlite3Dequote((char*)pNew->token.z);
        assert( pNew->token.n==(unsigned)sqlite3Strlen30((char*)pNew->token.z) );
      }
      if( c=='"' ) pNew->flags |= EP_DblQuoted;
    }else{
      pNew->token = *pToken;
    }
    pNew->token.quoted = 0;
  }else if( pLeft ){

      iReg = ++pParse->nMem;
      sqlite3ExprCode(pParse, pExpr, iReg);
      pParse->aAlias[iAlias-1] = iReg;
    }
  }
  return iReg;
#else
  UNUSED_PARAMETER(iAlias);
  return sqlite3ExprCodeTarget(pParse, pExpr, target);
#endif
}

/*
** Generate code into the current Vdbe to evaluate the given
** expression.  Attempt to store the results in register "target".

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.547 2009/05/06 18:57:10 shane Exp $
*/
#include "sqliteInt.h"

#ifdef SQLITE_ENABLE_FTS3
# include "fts3.h"
#endif
#ifdef SQLITE_ENABLE_RTREE

  return ( db->temp_store==2 );
#endif
#if SQLITE_TEMP_STORE==2
  return ( db->temp_store!=1 );
#endif
#if SQLITE_TEMP_STORE==3
  return 1;
#else
  return 0;
#endif
}

/*
** This routine is called to create a connection to a database BTree
** driver.  If zFilename is the name of a file, then that file is
** opened and used.  If zFilename is the magic name ":memory:" then
** the database is stored in memory (and is thus forgotten as soon as

** 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 1.586 2009/05/06 18:57:10 shane Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"

/*
** Macros for troubleshooting.  Normally turned off
*/

    ROUND8(sizeof(*pPager)) +      /* Pager structure */
    ROUND8(pcacheSize) +           /* PCache object */
    ROUND8(pVfs->szOsFile) +       /* The main db file */
    journalFileSize * 2 +          /* The two journal files */ 
    nPathname + 1 +                /* zFilename */
    nPathname + 8 + 1              /* zJournal */
  );
  assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
  if( !pPtr ){
    sqlite3_free(zPathname);
    return SQLITE_NOMEM;
  }
  pPager =              (Pager*)(pPtr);
  pPager->pPCache =    (PCache*)(pPtr += ROUND8(sizeof(*pPager)));
  pPager->fd =   (sqlite3_file*)(pPtr += ROUND8(pcacheSize));

** sub-journal. If the subjInMemory argument is zero, then any required
** sub-journal is implemented in-memory if pPager is an in-memory database, 
** or using a temporary file otherwise.
*/
int sqlite3PagerBegin(Pager *pPager, int exFlag, int subjInMemory){
  int rc = SQLITE_OK;
  assert( pPager->state!=PAGER_UNLOCK );
  pPager->subjInMemory = (u8)subjInMemory;
  if( pPager->state==PAGER_SHARED ){
    assert( pPager->pInJournal==0 );
    assert( !MEMDB && !pPager->tempFile );

    /* Obtain a RESERVED lock on the database file. If the exFlag parameter
    ** is true, then immediately upgrade this to an EXCLUSIVE lock. The
    ** busy-handler callback can be used when upgrading to the EXCLUSIVE

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.842 2009/05/06 18:57:10 shane Exp $
*/
#include "sqliteInt.h"
#include "vdbeInt.h"

/*
** The following global variable is incremented every time a cursor
** moves, either by the OP_SeekXX, OP_Next, or OP_Prev opcodes.  The test

** to instruction P2. Otherwise, the rowid of the conflicting index
** entry is copied to register P3 and control falls through to the next
** instruction.
**
** See also: NotFound, NotExists, Found
*/
case OP_IsUnique: {        /* jump, in3 */
  u16 ii;
  VdbeCursor *pCx;
  BtCursor *pCrsr;
  u16 nField;
  Mem *aMem = &p->aMem[pOp->p4.i];

  /* Assert that the values of parameters P1 and P4 are in range. */
  assert( pOp->p4type==P4_INT32 );
  assert( pOp->p4.i>0 && pOp->p4.i<=p->nMem );
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );

    if( (pIn1->flags & MEM_RowSet)==0 ) goto no_mem;
  }

  assert( pOp->p4type==P4_INT32 );
  assert( iSet==-1 || iSet>=0 );
  if( iSet ){
    int exists;
    exists = sqlite3RowSetTest(pIn1->u.pRowSet, 
                               (u8)(iSet>=0 ? iSet & 0xf : 0xff),
                               pIn3->u.i);
    if( exists ){
      pc = pOp->p2 - 1;
      break;
    }
  }
  if( iSet>=0 ){

**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
**
** $Id: vdbeaux.c,v 1.457 2009/05/06 18:57:10 shane Exp $
*/
#include "sqliteInt.h"
#include "vdbeInt.h"



/*

  KeyInfo *pKeyInfo;
  Mem mem1;

  pKeyInfo = pPKey2->pKeyInfo;
  mem1.enc = pKeyInfo->enc;
  mem1.db = pKeyInfo->db;
  mem1.flags = 0;
  mem1.u.i = 0;  /* not needed, here to silence compiler warning */
  mem1.zMalloc = 0;
  
  idx1 = getVarint32(aKey1, szHdr1);
  d1 = szHdr1;
  if( pPKey2->flags & UNPACKED_IGNORE_ROWID ){
    szHdr1--;
  }

** This module contains C code that generates VDBE code used to process
** the WHERE clause of SQL statements.  This module is responsible for
** generating the code that loops through a table looking for applicable
** rows.  Indices are selected and used to speed the search when doing
** so is applicable.  Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.395 2009/05/06 18:57:10 shane Exp $
*/
#include "sqliteInt.h"

/*
** Trace output macros
*/
#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)

        if( pSubWInfo ){
          if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
            int iSet = ((ii==pOrWc->nTerm-1)?-1:ii);
            int r;
            r = sqlite3ExprCodeGetColumn(pParse, pTabItem->pTab, -1, iCur, 
                                         regRowid, 0);
            sqlite3VdbeAddOp4(v, OP_RowSetTest, regRowset, 
                              sqlite3VdbeCurrentAddr(v)+2,
                              r, SQLITE_INT_TO_PTR(iSet), P4_INT32);
          }
          sqlite3VdbeAddOp2(v, OP_Gosub, regReturn, iLoopBody);

          /* Finish the loop through table entries that match term pOrTerm. */
          sqlite3WhereEnd(pSubWInfo);
        }
      }