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Overview
Comment:Working better with Win95. Continued work on the new db.c backend. (CVS 1714)
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: df0ff304855bd18c7a3517c500e891b6d006be6a
User & Date: drh 2001-01-31 13:28:08.000
Context
2001-01-31
13:28
Working better with Win95. Continued work on the new db.c backend. (CVS 181) (check-in: f9c55a9000 user: drh tags: trunk)
13:28
Working better with Win95. Continued work on the new db.c backend. (CVS 1714) (check-in: df0ff30485 user: drh tags: trunk)
2001-01-29
01:27
:-) (CVS 1713) (check-in: 3259a53111 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/db.c.
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** Boston, MA  02111-1307, USA.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** $Id: db.c,v 1.5 2001/01/29 01:27:20 drh Exp $
*/
#include "sqliteInt.h"
#include "pg.h"

/*
** Everything we need to know about an open database
*/
struct Db {
  Pgr *pPgr;            /* The pager for the database */
  DbCursor *pCursor;    /* All open cursors */
  int inTransaction;    /* True if a transaction is in progress */

  int nContents;        /* Number of slots in aContents[] */
  int nAlloc;           /* Space allocated for aContents[] */
  u32 *aContents;       /* Contents table for the database */
};

/*
** The maximum depth of a cursor
*/
#define MX_LEVEL 10

/*
** Within a cursor, each level off the search tree is an instance of
** this structure.
*/
typedef struct DbIdxpt DbIdxpt;
struct DbIdxpt {
  int pgno;         /* The page number */
  u32 *aPage;       /* The page data */
  int idx;          /* Index into pPage[] */
  int hashLB;       /* Lower bound on hash at this level */
  int hashUB;       /* Upper bound on hash at this level */
};

/*
** Everything we need to know about a cursor
*/
struct DbCursor {
  Db *pDb;                      /* The whole database */
  DbCursor *pPrev, *pNext;      /* Linked list of all cursors */
  u32 rootPgno;                 /* Root page of table for this cursor */
  int onEntry;                  /* True if pointing to a table entry */
  int nLevel;                   /* Number of levels of indexing used */
  DbIdxpt aLevel[MX_LEVEL];     /* The index levels */
};

/*
** Used for rebalancing
*/
typedef struct DbEntry DbEntry;




struct DbEntry {
  int nByte;      /* Space needed on leaf to record this entry */
  int pgno;       /* Page on which this entry is currently found */
  int idx;        /* Index slot in part that points to leaf "pgno" */
  u32 *aPage;     /* Pointer to the leaf for this entry */
  u32 *aEntry;    /* Pointer to the actual text of this entry */
  DbEntry *pNext; /* Next entry in a list of them all */
};

typedef struct DbEntrySet DbEntrySet;
struct DbEntrySet {
  u32 *pIndex;         /* The index node above the leaf pages being balanced */


  int nAlloc;          /* Number of slots allocated in aEntry[] */
  int nEntry;          /* Number of slots in aEntry[] actually used */









  DbEntry *pFirst;     /* First entry in hash order */
  DbEntry aEntry[100]; /* Descriptions of actual database entries */
};


/*
** The first word of every page is some combination of these values
** used to indicate its function.
*/
#define BLOCK_MAGIC            0x24e47190
#define BLOCK_INDEX            0x00000001
#define BLOCK_LEAF             0x00000002
#define BLOCK_FREE             0x00000003
#define BLOCK_OVERFLOW         0x00000004
#define BLOCK_CONTENTS         0x00000005
#define BLOCK_MAGIC_MASK       0xfffffff8
#define BLOCK_TYPE_MASK        0x00000007

/*
** Free blocks:
**
**     0.   BLOCK_MAGIC | BLOCK_FREE
**     1.   address of next block on freelist
**
** Leaf blocks:
**
**     0.   BLOCK_MAGIC | BLOCK_LEAF 
**     1.   number of table entries  (only used if a table root block)
**     entries....
**         0.  size of this entry (measured in u32's)
**         1.  hash
**         2.  keysize  (in bytes)
**         3.  datasize (in bytes)
**         4.  payload
**
** Payload area:
**
**     *   up to LOCAL_PAYLOAD bytes of data
**     *   10 page number of direct blocks
**     *   1 indirect block
**     *   1 double-indirect block
**
** Index block:
**
**     0.   BLOCK_MAGIC | BLOCK_INDEX
**     1.   number of table entries  (only used if a table root block)
**     2.   entries in this index block
**     entries...
**         0.  largest hash value for pgno
**         1.  pgno of subblock
**
** Contents block:  (The first page in the file)
**     0.   BLOCK_MAGIC | BLOCK_CONTENTS
**     1.   zero
**     2.   number of bytes of payload
**     3.   freelist
**     4... root pages numbers of tables
*/

/*
** The number of u32-sized objects that will fit on one page.
*/
#define U32_PER_PAGE  (SQLITE_PAGE_SIZE/sizeof(u32))

/*
** Number of direct overflow pages per database entry
*/
#define N_DIRECT  10

/*
** The maximum amount of payload that will fit on on the same
** page as a leaf, assuming the leaf contains only a single
** database entry and the entry uses no overflow pages.




*/
#define LOCAL_PAYLOAD  (SQLITE_PAGE_SIZE - (8+N_DIRECT)*sizeof(u32))

/*
** Allocate a new page.  Return both the page number and a pointer
** to the page data.  The calling function is responsible for unref-ing
** the page when it is no longer needed.




*/
int allocPage(Db *pDb, u32 *pPgno, u32 **ppPage){
  u32 pgno;
  int rc;

  if( pDb->aContent==0 ) return SQLITE_NOMEM;

  /* Try to reuse a page from the freelist
  */
  pgno = pDb->aContent[0];
  if( pgno!=0 ){
    rc = sqlitePgGet(pDb->pPgr, pgno, (void**)ppPage);
    if( rc==SQLITE_OK ){
      pDb->aContent[0] = pFree[1];
      *pPgno = pgno;


      memset(*ppPage, 0, SQLITE_PAGE_SIZE);
      return SQLITE_OK;



    }
  }

  /* If the freelist is empty, or we cannot access it,
  ** then allocate a new page from the end of the file.
  */
  if( (rc = sqlitePgCount(pDb->pPgr, &pgno))==SQLITE_OK &&
      (rc = sqlitePgGet(pDb->pPgr, pgno, (void**)ppPage))==SQLITE_OK ){
    *pPgno = pgno;
    memset(*ppPage, 0, SQLITE_PAGE_SIZE);
    return SQLITE_OK;
  }
  return rc;
}

/*
** Return a page to the freelist and dereference the page.
*/
static void freePage(DB *pDb, u32 pgno, u32 *aPage){
  if( pDb->aContent==0 ) return;
  if( pgno==0 ) return
  if( aPage==0 ){
    int rc;
    rc = sqlitePgGet(pDb->pPgr, pgno, &aPage);
    if( rc!=SQLITE_OK ) return;
  }

  aPage[0] = BLOCK_MAGIC | BLOCK_FREE;
  aPage[1] = pDb->aContent[0];

  memset(&aPage[2], 0, SQLITE_PAGE_SIZE - 2*sizeof(u32));
  pDb->aContent[0] = pgno;
  sqlitePgTouch(aPage);
  sqlitePgUnref(aPage);
}

/*
** Return the number of bytes of payload storage required on the leaf
** node to hold the amount of payload specified by the argument.







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** Boston, MA  02111-1307, USA.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** $Id: db.c,v 1.6 2001/01/31 13:28:08 drh Exp $
*/
#include "sqliteInt.h"
#include "pg.h"

/*
** Everything we need to know about an open database
*/
struct Db {
  Pgr *pPgr;            /* The pager for the database */
  DbCursor *pCursor;    /* All open cursors */
  int inTransaction;    /* True if a transaction is in progress */
  u32 freeList;         /* List of free blocks */
  int nTable;           /* Number of slots in aContent[] */
  u32 *aTable;          /* Root page numbers for all tables */

};

/*
** The maximum depth of a cursor
*/
#define MX_LEVEL 10

/*
** Within a cursor, each level off the search tree is an instance of
** this structure.
*/
typedef struct DbIdxpt DbIdxpt;
struct DbIdxpt {
  int pgno;         /* The page number */
  u32 *aPage;       /* The page data */
  int idx;          /* Index into pPage[] */


};

/*
** Everything we need to know about a cursor
*/
struct DbCursor {
  Db *pDb;                      /* The whole database */
  DbCursor *pPrev, *pNext;      /* Linked list of all cursors */
  u32 rootPgno;                 /* Root page of table for this cursor */
  int onEntry;                  /* True if pointing to a table entry */
  int nLevel;                   /* Number of levels of indexing used */
  DbIdxpt aLevel[MX_LEVEL];     /* The index levels */
};

/*
** Data layouts
**
** LEAF:
**    x[0]          Magic number: BLOCK_LEAF
**    x[1]          If root page, total number of entries in this table
**    ...           One or more entries follow the leaf.
**
** Entry:
**    x[N+0]        Number of u32-sized words in this entry


**    x[N+1]        Hash value for this entry



**    x[N+2]        Number of bytes of key in the payload
**    x[N+3]        Number of bytes of data in the payload
**    x{N+4]...     The payload area.
**
** INDEX:
**    x[0]          Magic number: BLOCK_INDEX
**    x[1]          If root page: total number of entries in this table
**    x[2]          Number of slots in this index (Max value of N)
**    x[2*N+3]      Page number containing entries with hash <= x[2*N+4]
**    x[2*N+4]      The maximum hash value for entries on page x[2*N+3].
**
** FREE:
**    x[0]          Magic number: BLOCK_FREE
**    x[1]          Page number of the next free block on the free list
**
** PAGE1:
**    x[0]          Magic number: BLOCK_PAGE1
**    x[1]          First page of the freelist
**    x[2]          Number of tables in this database

**    x[N+3]        Root page for table N

/*
** The first word of every page is some combination of these values
** used to indicate its function.
*/
#define BLOCK_PAGE1            0x24e47191
#define BLOCK_INDEX            0x7ac53b46
#define BLOCK_LEAF             0x60c45eef
#define BLOCK_FREE             0x5b2dda47














































/*
** The number of u32-sized objects that will fit on one page.
*/
#define U32_PER_PAGE  (SQLITE_PAGE_SIZE/sizeof(u32))

/*
** Number of direct overflow pages per database entry
*/
#define N_DIRECT  10

/*
** The maximum amount of payload (in bytes) that will fit on on the same
** page as a leaf.  In other words, the maximum amount of payload
** that does not require any overflow pages.
**
** This size is chosen so that a least 3 entry will fit on every 
** leaf.  That guarantees it will always be possible to add a new
** entry after a page split.
*/
#define LOCAL_PAYLOAD (((U32_PER_PAGE-2)/3 - (6+N_DIRECT))*sizeof(u32))

/*
** Allocate a new page.  Return both the page number and a pointer
** to the page data.  The calling function is responsible for unref-ing
** the page when it is no longer needed.
**
** The page is obtained from the freelist if there is anything there.
** If the freelist is empty, the new page comes from the end of the
** database file.
*/
int allocPage(Db *pDb, u32 *pPgno, u32 **ppPage){
  u32 pgno;
  int rc;

  if( pDb->aTable==0 ) return SQLITE_NOMEM;

  /* Try to reuse a page from the freelist
  */
  if( pDb->freeList==0 ){
    u32 *pPage;
    rc = sqlitePgGet(pDb->pPgr, pDb->freeList, &pPage);
    if( rc==SQLITE_OK ){
      if( pPage[0]==BLOCK_FREE ){
        *pPgno = pDb->freeList;
        *ppPage = aPage;
        pDb->freeList = aPage[1];
        memset(*ppPage, 0, SQLITE_PAGE_SIZE);
        return SQLITE_OK;
      }
      /* This only happens if we have database corruption */
      sqlitePgUnref(pPage);
    }
  }

  /* If the freelist is empty, or we cannot access it,
  ** then allocate a new page from the end of the file.
  */
  if( (rc = sqlitePgCount(pDb->pPgr, &pgno))==SQLITE_OK &&
      (rc = sqlitePgGet(pDb->pPgr, pgno, (void**)ppPage))==SQLITE_OK ){
    *pPgno = pgno;
    memset(*ppPage, 0, SQLITE_PAGE_SIZE);
    return SQLITE_OK;
  }
  return rc;
}

/*
** Return a page to the freelist and dereference the page.
*/
static void freePage(DB *pDb, u32 pgno, u32 *aPage){

  if( pgno==0 ) return
  if( aPage==0 ){
    int rc;
    rc = sqlitePgGet(pDb->pPgr, pgno, &aPage);
    if( rc!=SQLITE_OK ) return;
  }
  assert( sqlitePgNum(aPage)==pgno );
  aPage[0] = BLOCK_FREE;
  aPage[1] = pDb->freeList;
  pDb->freeList = pgno;
  memset(&aPage[2], 0, SQLITE_PAGE_SIZE - 2*sizeof(u32));

  sqlitePgTouch(aPage);
  sqlitePgUnref(aPage);
}

/*
** Return the number of bytes of payload storage required on the leaf
** node to hold the amount of payload specified by the argument.
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    sqlitePgUnref(dblIndirPage);
  }

  return SQLITE_OK;
}

/*

** Release any and all overflow pages associated with data starting
** with byte "newSize".  oldSize is the amount of payload before doing
** the free operation.
*/
static int payloadFree(Db *pDb, u32 *aPage, int newSize, int oldSize){
  int i, j;          /* Loop counters */
  int first, last;   /* Indices of first and last pages to be freed */
  int rc;            /* Return code from sqlitePgGet() */

  /* Skip over the local data.  We do not need to free it.
  */
  if( newSize>=oldSize ) return SQLITE_OK;







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    sqlitePgUnref(dblIndirPage);
  }

  return SQLITE_OK;
}

/*
** Resize the payload area.  If the payload area descreases in size,
** this routine deallocates unused overflow pages.  If the payload

** area increases in size, this routine is a no-op.
*/
static int payloadResize(Db *pDb, u32 *aPage, int oldSize, int newSize){
  int i, j;          /* Loop counters */
  int first, last;   /* Indices of first and last pages to be freed */
  int rc;            /* Return code from sqlitePgGet() */

  /* Skip over the local data.  We do not need to free it.
  */
  if( newSize>=oldSize ) return SQLITE_OK;
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  return SQLITE_OK;    
}

/*
** Allocate space for the content table in the given Db structure.
** return SQLITE_OK on success and SQLITE_NOMEM if it fails.
*/
static int sqliteDbExpandContent(Db *pDb, int newSize){
  if( pDb->nAlloc>=newSize ) return SQLITE_OK;
  pDb->nAlloc = newSize;
  pDb->aContent = sqliteRealloc( pDb->aContent, pDb->nAlloc*sizeof(u32));
  if( pDb->aContent==0 ){
    pDb->nContent = 0;
    pDb->nAlloc = 0;
    pDb->inTranaction = 0;
    return SQLITE_NOMEM;
  }
  return SQLITE_OK;
}

/*







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  return SQLITE_OK;    
}

/*
** Allocate space for the content table in the given Db structure.
** return SQLITE_OK on success and SQLITE_NOMEM if it fails.
*/
static int sqliteDbExpandTableArray(Db *pDb){


  pDb->aTable = sqliteRealloc( pDb->aTable, pDb->nTable*sizeof(u32));
  if( pDb->aTable==0 ){


    pDb->inTranaction = 0;
    return SQLITE_NOMEM;
  }
  return SQLITE_OK;
}

/*
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  pDb->pCursor = 0;
  pDb->inTransaction = 0;
  sqlitePgCount(pDb->pPgr, &nPage);
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=0 ) goto open_err;
  if( nPage==0 ){
    sqlitePgBeginTransaction(pDb->pPgr);
    aPage1[0] = BLOCK_MAGIC|BLOCK_CONTENT;
    aPage1[2] = sizeof(u32)*10;
    sqlitePgTouch(aPage1);
    sqlitePgCommit(pDb->pPgr);
  }
  pDb->nContent = aPage1[2]/sizeof(u32);
  pDb->nAlloc = 0;
  rc = sqliteDbExpandContent(pDb, pDb->nContent);
  if( rc!=SQLITE_OK ) goto open_err;
  rc = payloadRead(pDb, &aPage1[3], 0, aPage1[2], pDb->aContent);
  sqlitePgUnref(aPage1);
  if( rc!=SQLITE_OK ) goto open_err;
  *ppDb = pDb;
  return SQLITE_OK;

open_err:
  *ppDb = 0;







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  pDb->pCursor = 0;
  pDb->inTransaction = 0;
  sqlitePgCount(pDb->pPgr, &nPage);
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=0 ) goto open_err;
  if( nPage==0 ){
    sqlitePgBeginTransaction(pDb->pPgr);
    aPage1[0] = BLOCK_PAGE1;

    sqlitePgTouch(aPage1);
    sqlitePgCommit(pDb->pPgr);
  }
  pDb->freeList = aPage[1];
  pDb->nTable = aPage[2];
  rc = sqliteDbExpandTableArray(pDb);
  if( rc!=SQLITE_OK ) goto open_err;
  rc = payloadRead(pDb, &aPage1[3], 0, pDb->nTable*sizeof(u32), pDb->aTable);
  sqlitePgUnref(aPage1);
  if( rc!=SQLITE_OK ) goto open_err;
  *ppDb = pDb;
  return SQLITE_OK;

open_err:
  *ppDb = 0;
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  u32 *aPage1;
  int rc;
  if( !pDb->inTransaction ){
    return SQLITE_OK;
  }
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=SQLITE_OK ) return rc;

  aPage1[2] = pDb->nContent*sizeof(u32);
  payloadWrite(pDb, 0, aPage1[2], pDb->aContent);
  sqlitePgUnref(aPage1);
  rc = sqlitePgCommit(pDb->pPgr);
  if( rc!=SQLITE_OK ) return rc;
  pDb->inTransaction = 0;
  return SQLITE_OK;
}

/*
** Rollback the database to its state prior to the beginning of
** the transaction
*/
int sqliteDbRollback(Db *pDb){
  u32 *aPage1;
  if( !pDb->inTransaction ) return SQLITE_OK;
  rc = sqlitePgRollback(pDb->pPgr);
  if( rc!=SQLITE_OK ) return rc;
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=SQLITE_OK ) return rc;
  pDb->nContent = SWB(aPage1[3]) + 2;

  if( sqliteDbExpandContent(pDb, pDb->nContent)!=SQLITE_OK ){
    return SQLITE_NOMEM;
  }
  payloadRead(pDb, &aPage1[3], 0, pDb->nContent*sizeof(u32), pDb->aContent);

  pDb->inTransaction = 0;
  return SQLITE_OK;
}

/*
** Create a new table in the database.  Write the table number
** that is used to open a cursor into that table into *pTblno.
*/
int sqliteDbCreateTable(Db *pDb, int *pTblno){
  u32 *pPage;
  u32 pgno;
  int rc;
  int swTblno;
  int i;

  rc = allocPage(pDb, &pgno, &pPage);
  if( rc!=SQLITE_OK ){
    return rc;
  }
  tblno = -1;
  for(i=2; i<pDb->nContent; i++){
    if( pDb->aContent[i]==0 ){
      tblno = i - 2;
      break;
    }
  }
  if( tblno<0 ){
    tblno = pDb->aContent[1];



  }
  if( tblno+2 >= pDb->nContent ){
    sqliteDbExpandContent(pDb, tblno+2);
  }
  if( pDb->aContent==0 ){
    rc = SQLITE_NOMEM;
  }else{
    pDb->aContent[tblno+2] = pgno;
    pPage[0] = SWB(BLOCK_MAGIC | BLOCK_LEAF);
    memset(&pPage[1], 0, SQLITE_PAGE_SIZE - sizeof(u32));
    sqlitePgTouch(pPage);
  }
  sqlitePgUnref(pPage);
  return rc;
}

/*
** Recursively add a page to the free list
*/
static int sqliteDbDropPage(Db *pDb, u32 pgno){
  u32 *aPage;
  int rc;

  rc = sqlitePgGet(pDb->pPgr, pgno, (void**)&aPage);
  if( rc!=SQLITE_OK ) return rc;
  switch(  aPage[0] ){
    case BLOCK_MAGIC | BLOCK_INDEX: {
      int n, i;
      n = aPage[2];
      for(i=0; i<n; i++){
        u32 subpgno = aPage[4+i*2];
        if( subpgno>0 ) sqliteDbDropPage(pDb, subpgno);
      }
      freePage(pDb, pgno, aPage);
      break;
    }
    case BLOCK_MAGIC | BLOCK_LEAF: {
      int i = 2;
      while( i<U32_PER_PAGE ){
        int entrySize = aPage[i];
        if( entrySize==0 ) break;
        payloadFree(pDb, &aPage[i+4], 0, aPage[i+2]+aPage[i+3]);
        i += entrySize;
      }
      freePage(pDb, pgno, aPage);
      break;
    }
    default: {
      /* Do nothing */







>
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>









|





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<

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|













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812
813
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820
  u32 *aPage1;
  int rc;
  if( !pDb->inTransaction ){
    return SQLITE_OK;
  }
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=SQLITE_OK ) return rc;
  aPage1[1] = pDb->freeList;
  aPage1[2] = pDb->nTable;
  payloadWrite(pDb, &aPage1[3], 0, pDb->nTable*sizeof(u32), pDb->aTable);
  sqlitePgUnref(aPage1);
  rc = sqlitePgCommit(pDb->pPgr);
  if( rc!=SQLITE_OK ) return rc;
  pDb->inTransaction = 0;
  return SQLITE_OK;
}

/*
** Rollback the database to its state prior to the beginning of
** the transaction
*/
int sqliteDbRollback(Db *pDb){
  u32 *aPage1;
  if( !pDb->inTransaction ) return SQLITE_OK;
  rc = sqlitePgRollback(pDb->pPgr);
  if( rc!=SQLITE_OK ) return rc;
  rc = sqlitePgGet(pDb->pPgr, 1, &aPage1);
  if( rc!=SQLITE_OK ) return rc;
  pDb->freeList = aPage1[1];
  pDb->nTable = aPage1[2];
  if( sqliteDbExpandTableArray(pDb)!=SQLITE_OK ){
    return SQLITE_NOMEM;
  }
  payloadRead(pDb, &aPage1[3], 0, pDb->nTable*sizeof(u32), pDb->aTable);
  sqlitePgUnref(aPage1);
  pDb->inTransaction = 0;
  return SQLITE_OK;
}

/*
** Create a new table in the database.  Write the table number
** that is used to open a cursor into that table into *pTblno.
*/
int sqliteDbCreateTable(Db *pDb, int *pTblno){
  u32 *aPage;
  u32 pgno;
  int rc;
  int swTblno;
  int i;

  rc = allocPage(pDb, &pgno, &aPage);
  if( rc!=SQLITE_OK ){
    return rc;
  }
  tblno = -1;
  for(i=0; i<pDb->nTable; i++){
    if( pDb->aTable[i]==0 ){
      tblno = i;
      break;
    }
  }
  if( tblno<0 ){
    pDb->nTable++;
    rc = sqliteExpandTableArray(pDb);
    if( rc!=SQLITE_OK ){
      return rc;
    }


  }



  pDb->aTable[tblno] = pgno;
  aPage[0] = BLOCK_LEAF;
  memset(&aPage[1], 0, SQLITE_PAGE_SIZE - sizeof(u32));
  sqlitePgTouch(aPage);

  sqlitePgUnref(aPage);
  return rc;
}

/*
** Recursively add a page to the free list
*/
static int sqliteDbDropPage(Db *pDb, u32 pgno){
  u32 *aPage;
  int rc;

  rc = sqlitePgGet(pDb->pPgr, pgno, (void**)&aPage);
  if( rc!=SQLITE_OK ) return rc;
  switch(  aPage[0] ){
    case BLOCK_INDEX: {
      int n, i;
      n = aPage[2];
      for(i=0; i<n; i++){
        u32 subpgno = aPage[3 + i*2];
        if( subpgno>0 ) sqliteDbDropPage(pDb, subpgno);
      }
      freePage(pDb, pgno, aPage);
      break;
    }
    case BLOCK_LEAF: {
      int i = 2;
      while( i<U32_PER_PAGE ){
        int entrySize = aPage[i];
        if( entrySize==0 ) break;
        payloadResize(pDb, &aPage[i+4], aPage[i+2]+aPage[i+3], 0);
        i += entrySize;
      }
      freePage(pDb, pgno, aPage);
      break;
    }
    default: {
      /* Do nothing */
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883


884

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888
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*/
static int sqliteDbDropTable(Db *pDb, int tblno){
  DbCursor *pCur;
  u32 pgno;

  /* Find the root page for the table to be dropped.
  */
  if( pDb->aContent==0 ){
    return SQLITE_NOMEM;
  }
  if( tblno<0 || tblno+2>=pDb->nContent || pDb->aContent[tblno+2]==0 ){
    return SQLITE_NOTFOUND;
  }
  pgno = pDb->aContent[tblno+2];


  pDb->aContent[tblno+2] = 0;


  /* Reset any cursors pointing to the table that is about to
  ** be dropped */
  for(pCur=pDb->pCursor; pCur; pCur=pCur->pNext){
    if( pCur->rootPgno==pgno ){
      sqliteDbResetCursor(pCur, 0);
    }







|


|


|
>
>
|
>







842
843
844
845
846
847
848
849
850
851
852
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854
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856
857
858
859
860
861
862
863
864
865
866
*/
static int sqliteDbDropTable(Db *pDb, int tblno){
  DbCursor *pCur;
  u32 pgno;

  /* Find the root page for the table to be dropped.
  */
  if( pDb->aTable==0 ){
    return SQLITE_NOMEM;
  }
  if( tblno<0 || tblno>=pDb->nTable || pDb->aTable[tblno]==0 ){
    return SQLITE_NOTFOUND;
  }
  pgno = pDb->aTable[tblno];
  pDb->aTable[tblno] = 0;
  if( tblno==pDb->nTable-1 ){
    pDb->nTable--;
  }

  /* Reset any cursors pointing to the table that is about to
  ** be dropped */
  for(pCur=pDb->pCursor; pCur; pCur=pCur->pNext){
    if( pCur->rootPgno==pgno ){
      sqliteDbResetCursor(pCur, 0);
    }
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915
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924
*/
int sqliteDbCursorOpen(Db *pDb, int tblno, DbCursor **ppCur){
  u32 pgno;
  DbCursor *pCur;

  /* Translate the table number into a page number
  */
  if( pDb->aContent==0 ){
    *ppCur = 0;
    return SQLITE_NOMEM;
  }
  if( tblno<0 || tblno+2>=pDb->nContent || pDb->aContent[tblno+2]==0 ){
    *ppCur = 0;
    return SQLITE_NOTFOUND;
  }
  pgno = SWB(pDb->aContent[tblno+2]);
  
  /* Allocate the cursor
  */
  pCur = sqliteMalloc( sizeof(*pCur) );
  pCur->pgno = pgno;
  pCur->pDb = pDb;
  pCur->pNext = pDb->pCursor;







|



|



|







877
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899
*/
int sqliteDbCursorOpen(Db *pDb, int tblno, DbCursor **ppCur){
  u32 pgno;
  DbCursor *pCur;

  /* Translate the table number into a page number
  */
  if( pDb->aTable==0 ){
    *ppCur = 0;
    return SQLITE_NOMEM;
  }
  if( tblno<0 || tblno>=pDb->nContent || pDb->aTable[tblno]==0 ){
    *ppCur = 0;
    return SQLITE_NOTFOUND;
  }
  pgno = pDb->aTable[tblno];
  
  /* Allocate the cursor
  */
  pCur = sqliteMalloc( sizeof(*pCur) );
  pCur->pgno = pgno;
  pCur->pDb = pDb;
  pCur->pNext = pDb->pCursor;
961
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1000
1001
1002
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1006
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1011
1012
  if( pCur->nLevel > i+1 ){
    sqliteDbResetCursor(pCur, i+1);
  }
  assert( pCur->nLevel==i+1 );
  while( rc < 0 ){
    u32 *aPage = pCur->aLevel[i].aPage;
    assert( aPage!=0 );
    switch( SWB(aPage[0]) ){
      case BLOCK_LEAF | BLOCK_MAGIC: {
        if( aPage[1]!=0 ){
          pCur->aLevel[i].idx = 1;
          pCur->onEntry = 1;
        }else{
          sqliteDbResetCursor(pCur, 1);
        }
        rc = SQLITE_OK;
        break;
      }
      case BLOCK_INDEX | BLOCK_MAGIC: {
        int n = SWB(aPage[2]);
        if( n<2 || n>=((SQLITE_PAGE_SIZE/sizeof(u32))-3)/2 ){
          sqliteDbResetCur(pCur, 1);
          rc = SQLITE_CORRUPT;
          break;
        }
        pCur->nLevel++;
        i++;
        pCur->aLevel[i].pgno = SWB(aPage[4]);
        rc = sqlitePgGet(pCur->pDb->pPgr, pCur->aLevel[i].pgno,
                    &pCur->aLevel[i].aPage);
        if( rc != SQLITE_OK ){
          sqliteDbResetCursor(pCur, 1);
        }else{
          rc = -1;
        }
        break;
      }
      default: {
        sqliteDbResetCursor(pCur, 1);
        rc = SQLITE_CORRUPT;
      }
    }
  }
  return rc;
}



/*
** Move the cursor to the first entry in the table.
*/
int sqliteDbCursorFirst(DbCursor *pCur){
  if( pCur->nLevel==0 ){
    int rc;







|
|
|
|







|
|
|






|

















>
>







936
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941
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987
988
989
  if( pCur->nLevel > i+1 ){
    sqliteDbResetCursor(pCur, i+1);
  }
  assert( pCur->nLevel==i+1 );
  while( rc < 0 ){
    u32 *aPage = pCur->aLevel[i].aPage;
    assert( aPage!=0 );
    switch( aPage[0] ){
      case BLOCK_LEAF: {
        if( aPage[2]!=0 ){
          pCur->aLevel[i].idx = 2;
          pCur->onEntry = 1;
        }else{
          sqliteDbResetCursor(pCur, 1);
        }
        rc = SQLITE_OK;
        break;
      }
      case BLOCK_INDEX: {
        int n = aPage[2];
        if( n<2 || n>=((U32_PER_PAGE - 3)/2) ){
          sqliteDbResetCur(pCur, 1);
          rc = SQLITE_CORRUPT;
          break;
        }
        pCur->nLevel++;
        i++;
        pCur->aLevel[i].pgno = aPage[3];
        rc = sqlitePgGet(pCur->pDb->pPgr, pCur->aLevel[i].pgno,
                    &pCur->aLevel[i].aPage);
        if( rc != SQLITE_OK ){
          sqliteDbResetCursor(pCur, 1);
        }else{
          rc = -1;
        }
        break;
      }
      default: {
        sqliteDbResetCursor(pCur, 1);
        rc = SQLITE_CORRUPT;
      }
    }
  }
  return rc;
}

################

/*
** Move the cursor to the first entry in the table.
*/
int sqliteDbCursorFirst(DbCursor *pCur){
  if( pCur->nLevel==0 ){
    int rc;
Changes to src/db.h.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
** Boston, MA  02111-1307, USA.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** $Id: db.h,v 1.4 2001/01/29 01:27:20 drh Exp $
*/

typedef struct Db Db;
typedef struct DbCursor DbCursor;

int sqliteDbOpen(const char *filename, Db**);
int sqliteDbClose(Db*);







|







17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
** Boston, MA  02111-1307, USA.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** $Id: db.h,v 1.5 2001/01/31 13:28:09 drh Exp $
*/

typedef struct Db Db;
typedef struct DbCursor DbCursor;

int sqliteDbOpen(const char *filename, Db**);
int sqliteDbClose(Db*);
43
44
45
46
47
48
49
50
51
int sqliteDbCursorNext(DbCursor*);
int sqliteDbCursorDatasize(DbCursor*);
int sqliteDbCursorKeysize(DbCursor*);
int sqliteDbCursorRead(DbCursor*, int amt, int offset, void *buf);
int sqliteDbCursorReadKey(DbCursor*, int amt, int offset, void *buf);
int sqliteDbCursorWrite(DbCursor*, int amt, int offset, const void *buf);

int sqliteDbCursorFind(DbCursor*, int nKey, const void *pKey, int createSize);
int sqliteDbCursorResize(DbCursor*, int nData);







|

43
44
45
46
47
48
49
50
51
int sqliteDbCursorNext(DbCursor*);
int sqliteDbCursorDatasize(DbCursor*);
int sqliteDbCursorKeysize(DbCursor*);
int sqliteDbCursorRead(DbCursor*, int amt, int offset, void *buf);
int sqliteDbCursorReadKey(DbCursor*, int amt, int offset, void *buf);
int sqliteDbCursorWrite(DbCursor*, int amt, int offset, const void *buf);

int sqliteDbCursorFind(DbCursor*, int nKey, const void *pKey, int createFlag);
int sqliteDbCursorResize(DbCursor*, int nData);
Changes to src/printf.c.
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
**
**      +  When compiled using GCC on a SPARC, this version of printf is
**         faster than the library printf for SUN OS 4.1.
**
**      +  All functions are fully reentrant.
**
*/
#include <ctype.h>
#include "sqliteInt.h"

/*
** Undefine COMPATIBILITY to make some slight changes in the way things
** work.  I think the changes are an improvement, but they are not
** backwards compatible.
*/







<







42
43
44
45
46
47
48

49
50
51
52
53
54
55
**
**      +  When compiled using GCC on a SPARC, this version of printf is
**         faster than the library printf for SUN OS 4.1.
**
**      +  All functions are fully reentrant.
**
*/

#include "sqliteInt.h"

/*
** Undefine COMPATIBILITY to make some slight changes in the way things
** work.  I think the changes are an improvement, but they are not
** backwards compatible.
*/
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
      width = va_arg(ap,int);
      if( width<0 ){
        flag_leftjustify = 1;
        width = -width;
      }
      c = *++fmt;
    }else{
      while( isdigit(c) ){
        width = width*10 + c - '0';
        c = *++fmt;
      }
    }
    if( width > etBUFSIZE-10 ){
      width = etBUFSIZE-10;
    }
    /* Get the precision */
    if( c=='.' ){
      precision = 0;
      c = *++fmt;
      if( c=='*' ){
        precision = va_arg(ap,int);
#ifndef etCOMPATIBILITY
        /* This is sensible, but SUN OS 4.1 doesn't do it. */
        if( precision<0 ) precision = -precision;
#endif
        c = *++fmt;
      }else{
        while( isdigit(c) ){
          precision = precision*10 + c - '0';
          c = *++fmt;
        }
      }
      /* Limit the precision to prevent overflowing buf[] during conversion */
      if( precision>etBUFSIZE-40 ) precision = etBUFSIZE-40;
    }else{







|



















|







257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
      width = va_arg(ap,int);
      if( width<0 ){
        flag_leftjustify = 1;
        width = -width;
      }
      c = *++fmt;
    }else{
      while( c>='0' && c<='9' ){
        width = width*10 + c - '0';
        c = *++fmt;
      }
    }
    if( width > etBUFSIZE-10 ){
      width = etBUFSIZE-10;
    }
    /* Get the precision */
    if( c=='.' ){
      precision = 0;
      c = *++fmt;
      if( c=='*' ){
        precision = va_arg(ap,int);
#ifndef etCOMPATIBILITY
        /* This is sensible, but SUN OS 4.1 doesn't do it. */
        if( precision<0 ) precision = -precision;
#endif
        c = *++fmt;
      }else{
        while( c>='0' && c<='9' ){
          precision = precision*10 + c - '0';
          c = *++fmt;
        }
      }
      /* Limit the precision to prevent overflowing buf[] during conversion */
      if( precision>etBUFSIZE-40 ) precision = etBUFSIZE-40;
    }else{
Changes to src/random.c.
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
*************************************************************************
** This file contains code to implement a pseudo-random number
** generator (PRNG) for SQLite.
**
** Random numbers are used by some of the database backends in order
** to generate random integer keys for tables or random filenames.
**
** $Id: random.c,v 1.1 2001/01/13 14:34:07 drh Exp $
*/
#include "sqliteInt.h"


/*
** Get a single 8-bit random value from the RC4 PRNG.
*/
int sqliteRandomByte(void){
  int t;








|


|







23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
*************************************************************************
** This file contains code to implement a pseudo-random number
** generator (PRNG) for SQLite.
**
** Random numbers are used by some of the database backends in order
** to generate random integer keys for tables or random filenames.
**
** $Id: random.c,v 1.2 2001/01/31 13:28:09 drh Exp $
*/
#include "sqliteInt.h"
#include <time.h>

/*
** Get a single 8-bit random value from the RC4 PRNG.
*/
int sqliteRandomByte(void){
  int t;

Changes to src/tclsqlite.c.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** A TCL Interface to SQLite
**
** $Id: tclsqlite.c,v 1.12 2000/10/19 14:59:27 drh Exp $
*/
#ifndef NO_TCL     /* Omit this whole file if TCL is unavailable */

#include "sqlite.h"
#include <tcl.h>
#include <stdlib.h>
#include <string.h>

/*
** There is one instance of this structure for each SQLite database
** that has been opened by the SQLite TCL interface.
*/







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** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*************************************************************************
** A TCL Interface to SQLite
**
** $Id: tclsqlite.c,v 1.13 2001/01/31 13:28:09 drh Exp $
*/
#ifndef NO_TCL     /* Omit this whole file if TCL is unavailable */

#include "sqlite.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

/*
** There is one instance of this structure for each SQLite database
** that has been opened by the SQLite TCL interface.
*/
Changes to test/dbbe.test.
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#   drh@hwaci.com
#   http://www.hwaci.com/drh/
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is exercising the code in dbbe.c.
#
# $Id: dbbe.test,v 1.4 2000/10/16 22:06:43 drh Exp $

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

# Try to open a database that does not exist.
#
do_test dbbe-1.1 {
  catch {db close}
  file delete -force testdb
  set v [catch {sqlite db testdb 0444} msg]
  lappend v $msg
} {1 {can't find directory "testdb"}}
do_test dbbe-1.2 {
  catch {db close}
  file delete -force testdb
  set v [catch {sqlite db testdb/dummy 0666} msg]
  lappend v $msg
} {1 {can't find or create directory "testdb/dummy"}}

# Try to open a database for writing in a directory that
# doesn't exist but for which the parent directory does
# exist.  This should work!
#
do_test dbbe-1.3 {
  catch {db close}
  file delete -force testdb
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {0 {}}

# Try to open a file instead of a directory.
#
do_test dbbe-1.4 {
  catch {db close}
  file delete -force testdb
  set fd [open testdb w]
  puts $fd hi!
  close $fd
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {not a directory: "testdb"}}

# Access permission denied on the directory.
#
do_test dbbe-1.5 {
  catch {db close}
  file delete -force testdb
  file mkdir testdb
  file attributes testdb -permissions 0
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {access permission denied}}

# Access permission denied on the master file
#
do_test dbbe-1.6 {
  catch {db close}
  file delete -force testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  file attributes testdb/sqlite_master.tbl -permission 0444
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {access permission denied for testdb/sqlite_master.tbl}}
do_test dbbe-1.6b {
  catch {db close}
  file delete -force testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  file attributes testdb/sqlite_master.tbl -permission 0444
  set v [catch {sqlite db testdb 0444} msg]
  lappend v $msg
} {0 {}}

# Make sure a table can be accessed by either uppercase or lowercase
# names
#
do_test dbbe-2.1 {
  catch {db close}
  file delete -force testdb
  sqlite db testdb 0666
  execsql {
    CREATE TABLE t1(x int);
    INSERT INTO t1 VALUES(1);
  }
  db close
  sqlite db testdb 0444
  set r [execsql {SELECT * FROM T1}]
  db close
  sqlite db testdb 0666
  lappend r [execsql {SELECT * FROM t1}]
} {1 1}

# Try to change a table after opening the database readonly
#
do_test dbbe-3.1 {
  catch {db close}
  file delete -force testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  sqlite db testdb 0444
  set v [catch {execsql {INSERT INTO t1 VALUES(1)}} msg]
  lappend v $msg
} {7 {table t1 is readonly}}


finish_test







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#   drh@hwaci.com
#   http://www.hwaci.com/drh/
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is exercising the code in dbbe.c.
#
# $Id: dbbe.test,v 1.5 2001/01/31 13:28:09 drh Exp $

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

# Try to open a database that does not exist.
#
do_test dbbe-1.1 {
  catch {db close}
  forcedelete testdb
  set v [catch {sqlite db testdb 0444} msg]
  lappend v $msg
} {1 {can't find directory "testdb"}}
do_test dbbe-1.2 {
  catch {db close}
  forcedelete testdb
  set v [catch {sqlite db testdb/dummy 0666} msg]
  lappend v $msg
} {1 {can't find or create directory "testdb/dummy"}}

# Try to open a database for writing in a directory that
# doesn't exist but for which the parent directory does
# exist.  This should work!
#
do_test dbbe-1.3 {
  catch {db close}
  forcedelete testdb
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {0 {}}

# Try to open a file instead of a directory.
#
do_test dbbe-1.4 {
  catch {db close}
  forcedelete testdb
  set fd [open testdb w]
  puts $fd hi!
  close $fd
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {not a directory: "testdb"}}

# Access permission denied on the directory.
#
do_test dbbe-1.5 {
  catch {db close}
  forcedelete testdb
  file mkdir testdb
  file attributes testdb -permissions 0
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {access permission denied}}

# Access permission denied on the master file
#
do_test dbbe-1.6 {
  catch {db close}
  forcedelete testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  file attributes testdb/sqlite_master.tbl -permission 0444
  set v [catch {sqlite db testdb 0666} msg]
  lappend v $msg
} {1 {access permission denied for testdb/sqlite_master.tbl}}
do_test dbbe-1.6b {
  catch {db close}
  forcedelete testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  file attributes testdb/sqlite_master.tbl -permission 0444
  set v [catch {sqlite db testdb 0444} msg]
  lappend v $msg
} {0 {}}

# Make sure a table can be accessed by either uppercase or lowercase
# names
#
do_test dbbe-2.1 {
  catch {db close}
  forcedelete testdb
  sqlite db testdb 0666
  execsql {
    CREATE TABLE t1(x int);
    INSERT INTO t1 VALUES(1);
  }
  db close
  sqlite db testdb 0444
  set r [execsql {SELECT * FROM T1}]
  db close
  sqlite db testdb 0666
  lappend r [execsql {SELECT * FROM t1}]
} {1 1}

# Try to change a table after opening the database readonly
#
do_test dbbe-3.1 {
  catch {db close}
  forcedelete testdb
  sqlite db testdb 0666
  execsql {CREATE TABLE t1(x int)}
  db close
  sqlite db testdb 0444
  set v [catch {execsql {INSERT INTO t1 VALUES(1)}} msg]
  lappend v $msg
} {7 {table t1 is readonly}}


finish_test
Changes to test/tester.tcl.
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#   drh@hwaci.com
#   http://www.hwaci.com/drh/
#
#***********************************************************************
# This file implements some common TCL routines used for regression
# testing the SQLite library
#
# $Id: tester.tcl,v 1.9 2001/01/22 00:31:53 drh Exp $

# Create a test database
#
if {![info exists dbprefix]} {
  if {[info exists env(SQLITE_PREFIX)]} {
    set dbprefix $env(SQLITE_PREFIX):
  } else {
    set dbprefix "gdbm:"
  }
}
switch $dbprefix {
  gdbm: {
   file delete -force testdb


   file mkdir testdb
  }
  memory: {
   # do nothing
  }
}
sqlite db ${dbprefix}testdb







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>
>







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#   drh@hwaci.com
#   http://www.hwaci.com/drh/
#
#***********************************************************************
# This file implements some common TCL routines used for regression
# testing the SQLite library
#
# $Id: tester.tcl,v 1.10 2001/01/31 13:28:09 drh Exp $

# Create a test database
#
if {![info exists dbprefix]} {
  if {[info exists env(SQLITE_PREFIX)]} {
    set dbprefix $env(SQLITE_PREFIX):
  } else {
    set dbprefix "gdbm:"
  }
}
switch $dbprefix {
  gdbm: {
   if {[catch {file delete -force testdb}]} {
     exec rm -rf testdb
   }
   file mkdir testdb
  }
  memory: {
   # do nothing
  }
}
sqlite db ${dbprefix}testdb
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  db eval $sql data {
    foreach f $data(*) {
      lappend result $f $data($f)
    }
  }
  return $result
}















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  db eval $sql data {
    foreach f $data(*) {
      lappend result $f $data($f)
    }
  }
  return $result
}

# Delete a file or directory
#
proc forcedelete {filename} {
  if {[catch {file delete -force $filename}]} {
    exec rm -rf $filename
  }
}
Changes to www/crosscompile.tcl.
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#
# Run this Tcl script to generate the crosscompile.html file.
#
set rcsid {$Id: crosscompile.tcl,v 1.3 2000/10/11 19:28:53 drh Exp $}

puts {<html>
<head>
  <title>Notes On How To Compile SQLite Using The MinGW Cross-Compiler</title>
</head>
<body bgcolor=white>
<h1 align=center>



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#
# Run this Tcl script to generate the crosscompile.html file.
#
set rcsid {$Id: crosscompile.tcl,v 1.4 2001/01/31 13:28:09 drh Exp $}

puts {<html>
<head>
  <title>Notes On How To Compile SQLite Using The MinGW Cross-Compiler</title>
</head>
<body bgcolor=white>
<h1 align=center>
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<blockquote><pre>
cat &gt;&gt;systems.h &lt;&lt;\END
#ifdef NO_LOCKS
#undef  UNLOCK_FILE
#define UNLOCK_FILE(x)
#undef  READLOCK_FILE
#define READLOCK_FILE(x)
#undef  WRITELOCK_FILE
#define WRITELOCK_FILE(x)
#endif
END
</pre></blockquote>

<p>Then manually build the GDBM library with the extra
"NO_LOCKS" define as follows:</p>
<blockquote><pre>







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<blockquote><pre>
cat &gt;&gt;systems.h &lt;&lt;\END
#ifdef NO_LOCKS
#undef  UNLOCK_FILE
#define UNLOCK_FILE(x)
#undef  READLOCK_FILE
#define READLOCK_FILE(x)  lock_val=0;
#undef  WRITELOCK_FILE
#define WRITELOCK_FILE(x) lock_val=0;
#endif
END
</pre></blockquote>

<p>Then manually build the GDBM library with the extra
"NO_LOCKS" define as follows:</p>
<blockquote><pre>