/*
** 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"
#undef _SQLITE_OS_C_
/*
** The following routines are convenience wrappers around methods
** of the sqlite3_file 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(sqlite3_file **pId){
int rc = SQLITE_OK;
sqlite3_file *id;
if( pId!=0 && (id = *pId)!=0 ){
rc = id->pMethods->xClose(id);
if( rc==SQLITE_OK ){
*pId = 0;
}
}
return rc;
}
int sqlite3OsRead(sqlite3_file *id, void *pBuf, int amt, i64 offset){
return id->pMethods->xRead(id, pBuf, amt, offset);
}
int sqlite3OsWrite(sqlite3_file *id, const void *pBuf, int amt, i64 offset){
return id->pMethods->xWrite(id, pBuf, amt, offset);
}
int sqlite3OsTruncate(sqlite3_file *id, i64 size){
return id->pMethods->xTruncate(id, size);
}
int sqlite3OsSync(sqlite3_file *id, int fullsync){
return id->pMethods->xSync(id, fullsync);
}
int sqlite3OsFileSize(sqlite3_file *id, i64 *pSize){
return id->pMethods->xFileSize(id, pSize);
}
int sqlite3OsLock(sqlite3_file *id, int lockType){
return id->pMethods->xLock(id, lockType);
}
int sqlite3OsUnlock(sqlite3_file *id, int lockType){
return id->pMethods->xUnlock(id, lockType);
}
int sqlite3OsBreakLock(sqlite3_file *id){
return id->pMethods->xBreakLock(id);
}
int sqlite3OsCheckReservedLock(sqlite3_file *id){
return id->pMethods->xCheckReservedLock(id);
}
int sqlite3OsSectorSize(sqlite3_file *id){
int (*xSectorSize)(sqlite3_file*) = id->pMethods->xSectorSize;
return xSectorSize ? xSectorSize(id) : SQLITE_DEFAULT_SECTOR_SIZE;
}
int sqlite3OsDeviceCharacteristics(sqlite3_file *id){
return id->pMethods->xDeviceCharacteristics(id);
}
#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)
/* These methods are currently only used for testing and debugging. */
int sqlite3OsFileHandle(sqlite3_file *id){
/* return id->pMethods->xFileHandle(id); */
return 0;
}
int sqlite3OsLockState(sqlite3_file *id){
/* return id->pMethods->xLockState(id); */
return 0;
}
#endif
#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