** sqlite and the code that does the actually reading and writing
** of information to the disk.
**
** This file uses GDBM as the database backend.  It should be
** relatively simple to convert to a different database such
** as NDBM, SDBM, or BerkeleyDB.
**
** $Id: dbbe.c,v 1.9 2000/06/02 01:51:20 drh Exp $
*/
#include "sqliteInt.h"
#include <gdbm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
................................................................................
*/
struct Dbbe {
  char *zDir;        /* The directory containing the database */
  int write;         /* True for write permission */
  BeFile *pOpen;     /* List of open files */
  int nTemp;         /* Number of temporary files created */
  FILE **apTemp;     /* Space to hold temporary file pointers */

  struct rc4 rc4;    /* The random number generator */
};

/*
** Each file within the database is an instance of this
** structure.
*/
................................................................................
}

/*
** Completely shutdown the given database.  Close all files.  Free all memory.
*/
void sqliteDbbeClose(Dbbe *pBe){
  BeFile *pFile, *pNext;

  for(pFile=pBe->pOpen; pFile; pFile=pNext){
    pNext = pFile->pNext;
    gdbm_close(pFile->dbf);
    memset(pFile, 0, sizeof(*pFile));   
    sqliteFree(pFile);
  }












  memset(pBe, 0, sizeof(*pBe));
  sqliteFree(pBe);
}

/*
** Translate the name of a table into the name of a file that holds
** that table.  Space to hold the filename is obtained from
................................................................................

  for(i=0; i<pBe->nTemp; i++){
    if( pBe->apTemp[i]==0 ) break;
  }
  if( i>=pBe->nTemp ){
    pBe->nTemp++;
    pBe->apTemp = sqliteRealloc(pBe->apTemp, pBe->nTemp*sizeof(FILE*) );

  }
  if( pBe->apTemp==0 ){
    *ppFile = 0;
    return SQLITE_NOMEM;
  }
  limit = 4;
  zFile = 0;
................................................................................
    sqliteFree(zFile);
    zFile = 0;
    sqliteSetString(&zFile, pBe->zDir, zBuf, 0);
  }while( access(zFile,0)==0 && limit-- >= 0 );
  *ppFile = pBe->apTemp[i] = fopen(zFile, "w+");
  if( pBe->apTemp[i]==0 ){
    rc = SQLITE_ERROR;
  }
  sqliteFree(zFile);




  return rc;
}

/*
** Close a temporary file opened using sqliteDbbeOpenTempFile()
*/
void sqliteDbbeCloseTempFile(Dbbe *pBe, FILE *f){
  int i;
  for(i=0; i<pBe->nTemp; i++){
    if( pBe->apTemp[i]==f ){
      char *zFile;
      char zBuf[30];
      sprintf(zBuf, "/_temp_%d~", i);
      zFile = 0;
      sqliteSetString(&zFile, pBe->zDir, zBuf, 0);
      unlink(zFile);
      sqliteFree(zFile);
      pBe->apTemp[i] = 0;

      break;
    }
  }
  fclose(f);
}

** sqlite and the code that does the actually reading and writing
** of information to the disk.
**
** This file uses GDBM as the database backend.  It should be
** relatively simple to convert to a different database such
** as NDBM, SDBM, or BerkeleyDB.
**
** $Id: dbbe.c,v 1.10 2000/06/02 02:09:23 drh Exp $
*/
#include "sqliteInt.h"
#include <gdbm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
................................................................................
*/
struct Dbbe {
  char *zDir;        /* The directory containing the database */
  int write;         /* True for write permission */
  BeFile *pOpen;     /* List of open files */
  int nTemp;         /* Number of temporary files created */
  FILE **apTemp;     /* Space to hold temporary file pointers */
  char **azTemp;     /* Names of the temporary files */
  struct rc4 rc4;    /* The random number generator */
};

/*
** Each file within the database is an instance of this
** structure.
*/
................................................................................
}

/*
** Completely shutdown the given database.  Close all files.  Free all memory.
*/
void sqliteDbbeClose(Dbbe *pBe){
  BeFile *pFile, *pNext;
  int i;
  for(pFile=pBe->pOpen; pFile; pFile=pNext){
    pNext = pFile->pNext;
    gdbm_close(pFile->dbf);
    memset(pFile, 0, sizeof(*pFile));   
    sqliteFree(pFile);
  }
  for(i=0; i<pBe->nTemp; i++){
    if( pBe->apTemp[i]!=0 ){
      unlink(pBe->azTemp[i]);
      fclose(pBe->apTemp[i]);
      sqliteFree(pBe->azTemp[i]);
      pBe->apTemp[i] = 0;
      pBe->azTemp[i] = 0;
      break;
    }
  }
  sqliteFree(pBe->azTemp);
  sqliteFree(pBe->apTemp);
  memset(pBe, 0, sizeof(*pBe));
  sqliteFree(pBe);
}

/*
** Translate the name of a table into the name of a file that holds
** that table.  Space to hold the filename is obtained from
................................................................................

  for(i=0; i<pBe->nTemp; i++){
    if( pBe->apTemp[i]==0 ) break;
  }
  if( i>=pBe->nTemp ){
    pBe->nTemp++;
    pBe->apTemp = sqliteRealloc(pBe->apTemp, pBe->nTemp*sizeof(FILE*) );
    pBe->azTemp = sqliteRealloc(pBe->azTemp, pBe->nTemp*sizeof(char*) );
  }
  if( pBe->apTemp==0 ){
    *ppFile = 0;
    return SQLITE_NOMEM;
  }
  limit = 4;
  zFile = 0;
................................................................................
    sqliteFree(zFile);
    zFile = 0;
    sqliteSetString(&zFile, pBe->zDir, zBuf, 0);
  }while( access(zFile,0)==0 && limit-- >= 0 );
  *ppFile = pBe->apTemp[i] = fopen(zFile, "w+");
  if( pBe->apTemp[i]==0 ){
    rc = SQLITE_ERROR;

    sqliteFree(zFile);
    pBe->azTemp[i] = 0;
  }else{
    pBe->azTemp[i] = zFile;
  }
  return rc;
}

/*
** Close a temporary file opened using sqliteDbbeOpenTempFile()
*/
void sqliteDbbeCloseTempFile(Dbbe *pBe, FILE *f){
  int i;
  for(i=0; i<pBe->nTemp; i++){
    if( pBe->apTemp[i]==f ){





      unlink(pBe->azTemp[i]);
      sqliteFree(pBe->azTemp[i]);
      pBe->apTemp[i] = 0;
      pBe->azTemp[i] = 0;
      break;
    }
  }
  fclose(f);
}