/*

** 2005 November 29

**

** 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.

**

******************************************************************************

**

** This file contains OS interface code that is common to all

** architectures.

*/

#define _SQLITE_OS_C_ 1

#include "sqliteInt.h"

#include "os.h"

/*

** The following routines are convenience wrappers around methods

** of the OsFile object.  This is mostly just syntactic sugar.  All

** of this would be completely automatic if SQLite were coded using

** C++ instead of plain old C.

*/

int sqlite3OsClose(OsFile **pId){

  OsFile *id;

  if( pId!=0 && (id = *pId)!=0 ){

    return id->pMethod->xClose(pId);

  }else{

    return SQLITE_OK;

  }

}

int sqlite3OsOpenDirectory(OsFile *id, const char *zName){

  return id->pMethod->xOpenDirectory(id, zName);

}

int sqlite3OsRead(OsFile *id, void *pBuf, int amt){

  return id->pMethod->xRead(id, pBuf, amt);

}

int sqlite3OsWrite(OsFile *id, const void *pBuf, int amt){

  return id->pMethod->xWrite(id, pBuf, amt);

}

int sqlite3OsSeek(OsFile *id, i64 offset){

  return id->pMethod->xSeek(id, offset);

}

int sqlite3OsTruncate(OsFile *id, i64 size){

  return id->pMethod->xTruncate(id, size);

}

int sqlite3OsSync(OsFile *id, int fullsync){

  return id->pMethod->xSync(id, fullsync);

}

void sqlite3OsSetFullSync(OsFile *id, int value){

  id->pMethod->xSetFullSync(id, value);

}

#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)

/* This method is currently only used while interactively debugging the 

** pager. More specificly, it can only be used when sqlite3DebugPrintf() is

** included in the build. */

int sqlite3OsFileHandle(OsFile *id){

  return id->pMethod->xFileHandle(id);

}

#endif

int sqlite3OsFileSize(OsFile *id, i64 *pSize){

  return id->pMethod->xFileSize(id, pSize);

}

int sqlite3OsLock(OsFile *id, int lockType){

  return id->pMethod->xLock(id, lockType);

}

int sqlite3OsUnlock(OsFile *id, int lockType){

  return id->pMethod->xUnlock(id, lockType);

}

int sqlite3OsLockState(OsFile *id){

  return id->pMethod->xLockState(id);

}

int sqlite3OsCheckReservedLock(OsFile *id){

  return id->pMethod->xCheckReservedLock(id);

}

#ifdef SQLITE_ENABLE_REDEF_IO

/*

** A function to return a pointer to the virtual function table.

** This routine really does not accomplish very much since the

** virtual function table is a global variable and anybody who

** can call this function can just as easily access the variable

** for themselves.  Nevertheless, we include this routine for

** backwards compatibility with an earlier redefinable I/O

** interface design.

*/

struct sqlite3OsVtbl *sqlite3_os_switch(void){

  return &sqlite3Os;

}

#endif