/*** 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);}#endifint 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