SQLite

**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains OS interface code that is common to all
** architectures.
**
** $Id: os.c,v 1.108 2008/05/16 04:51:55 danielk1977 Exp $
** $Id: os.c,v 1.109 2008/05/29 02:53:00 shane Exp $
*/
#define _SQLITE_OS_C_ 1
#include "sqliteInt.h"
#undef _SQLITE_OS_C_

/*
** The default SQLite sqlite3_vfs implementations do not allocate

  sqlite3_vfs *pVfs, 
  const char *zPath, 
  int nPathOut, 
  char *zPathOut
){
  return pVfs->xFullPathname(pVfs, zPath, nPathOut, zPathOut);
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION
void *sqlite3OsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
  return pVfs->xDlOpen(pVfs, zPath);
}
void sqlite3OsDlError(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
  pVfs->xDlError(pVfs, nByte, zBufOut);
}
void *sqlite3OsDlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol){
  return pVfs->xDlSym(pVfs, pHandle, zSymbol);
}
void sqlite3OsDlClose(sqlite3_vfs *pVfs, void *pHandle){
  pVfs->xDlClose(pVfs, pHandle);
}
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
int sqlite3OsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
  return pVfs->xRandomness(pVfs, nByte, zBufOut);
}
int sqlite3OsSleep(sqlite3_vfs *pVfs, int nMicro){
  return pVfs->xSleep(pVfs, nMicro);
}
int sqlite3OsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){

** This header file (together with is companion C source-code file
** "os.c") attempt to abstract the underlying operating system so that
** the SQLite library will work on both POSIX and windows systems.
**
** This header file is #include-ed by sqliteInt.h and thus ends up
** being included by every source file.
**
** $Id: os.h,v 1.99 2008/05/16 04:51:55 danielk1977 Exp $
** $Id: os.h,v 1.100 2008/05/29 02:53:00 shane Exp $
*/
#ifndef _SQLITE_OS_H_
#define _SQLITE_OS_H_

/*
** Figure out if we are dealing with Unix, Windows, or some other
** operating system.  After the following block of preprocess macros,

** Functions for accessing sqlite3_vfs methods 
*/
int sqlite3OsOpen(sqlite3_vfs *, const char *, sqlite3_file*, int, int *);
int sqlite3OsDelete(sqlite3_vfs *, const char *, int);
int sqlite3OsAccess(sqlite3_vfs *, const char *, int);
int sqlite3OsGetTempname(sqlite3_vfs *, int, char *);
int sqlite3OsFullPathname(sqlite3_vfs *, const char *, int, char *);
#ifndef SQLITE_OMIT_LOAD_EXTENSION
void *sqlite3OsDlOpen(sqlite3_vfs *, const char *);
void sqlite3OsDlError(sqlite3_vfs *, int, char *);
void *sqlite3OsDlSym(sqlite3_vfs *, void *, const char *);
void sqlite3OsDlClose(sqlite3_vfs *, void *);
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
int sqlite3OsRandomness(sqlite3_vfs *, int, char *);
int sqlite3OsSleep(sqlite3_vfs *, int);
int sqlite3OsCurrentTime(sqlite3_vfs *, double*);

/*
** Convenience functions for opening and closing files using 
** sqlite3_malloc() to obtain space for the file-handle structure.

**
******************************************************************************
**
** This file contains code that modified the OS layer in order to simulate
** different device types (by overriding the return values of the 
** xDeviceCharacteristics() and xSectorSize() methods).
**
** $Id: test_devsym.c,v 1.4 2008/05/16 04:51:55 danielk1977 Exp $
** $Id: test_devsym.c,v 1.5 2008/05/29 02:53:00 shane Exp $
*/
#if SQLITE_TEST          /* This file is used for testing only */

#include "sqlite3.h"
#include "sqliteInt.h"

/*

** Method declarations for devsym_vfs.
*/
static int devsymOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
static int devsymDelete(sqlite3_vfs*, const char *zName, int syncDir);
static int devsymAccess(sqlite3_vfs*, const char *zName, int flags);
static int devsymGetTempName(sqlite3_vfs*, int nOut, char *zOut);
static int devsymFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
#ifndef SQLITE_OMIT_LOAD_EXTENSION
static void *devsymDlOpen(sqlite3_vfs*, const char *zFilename);
static void devsymDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
static void *devsymDlSym(sqlite3_vfs*,void*, const char *zSymbol);
static void devsymDlClose(sqlite3_vfs*, void*);
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
static int devsymRandomness(sqlite3_vfs*, int nByte, char *zOut);
static int devsymSleep(sqlite3_vfs*, int microseconds);
static int devsymCurrentTime(sqlite3_vfs*, double*);

static sqlite3_vfs devsym_vfs = {
  1,                     /* iVersion */
  sizeof(devsym_file),      /* szOsFile */
  DEVSYM_MAX_PATHNAME,      /* mxPathname */
  0,                     /* pNext */
  DEVSYM_VFS_NAME,          /* zName */
  0,                     /* pAppData */
  devsymOpen,               /* xOpen */
  devsymDelete,             /* xDelete */
  devsymAccess,             /* xAccess */
  devsymGetTempName,        /* xGetTempName */
  devsymFullPathname,       /* xFullPathname */
#ifndef SQLITE_OMIT_LOAD_EXTENSION
  devsymDlOpen,             /* xDlOpen */
  devsymDlError,            /* xDlError */
  devsymDlSym,              /* xDlSym */
  devsymDlClose,            /* xDlClose */
#else
  0,                        /* xDlOpen */
  0,                        /* xDlError */
  0,                        /* xDlSym */
  0,                        /* xDlClose */
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
  devsymRandomness,         /* xRandomness */
  devsymSleep,              /* xSleep */
  devsymCurrentTime         /* xCurrentTime */
};

static sqlite3_io_methods devsym_io_methods = {
  1,                            /* iVersion */

  const char *zPath, 
  int nOut, 
  char *zOut
){
  return sqlite3OsFullPathname(g.pVfs, zPath, nOut, zOut);
}

#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Open the dynamic library located at zPath and return a handle.
*/
static void *devsymDlOpen(sqlite3_vfs *pVfs, const char *zPath){
  return sqlite3OsDlOpen(g.pVfs, zPath);
}

/*
** Close the dynamic library handle pHandle.
*/
static void devsymDlClose(sqlite3_vfs *pVfs, void *pHandle){
  sqlite3OsDlClose(g.pVfs, pHandle);
}
#endif /* SQLITE_OMIT_LOAD_EXTENSION */

/*
** Populate the buffer pointed to by zBufOut with nByte bytes of 
** random data.
*/
static int devsymRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
  return sqlite3OsRandomness(g.pVfs, nByte, zBufOut);