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Unified Diff: third_party/sqlite/sqlite-src-3080704/src/test_demovfs.c

Issue 2363173002: [sqlite] Remove obsolete reference version 3.8.7.4. (Closed)
Patch Set: Created 4 years, 3 months ago
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Index: third_party/sqlite/sqlite-src-3080704/src/test_demovfs.c
diff --git a/third_party/sqlite/sqlite-src-3080704/src/test_demovfs.c b/third_party/sqlite/sqlite-src-3080704/src/test_demovfs.c
deleted file mode 100644
index c63b0a8b7a19bc398e1edb5d523757f2a0973e88..0000000000000000000000000000000000000000
--- a/third_party/sqlite/sqlite-src-3080704/src/test_demovfs.c
+++ /dev/null
@@ -1,679 +0,0 @@
-/*
-** 2010 April 7
-**
-** 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 implements an example of a simple VFS implementation that
-** omits complex features often not required or not possible on embedded
-** platforms. Code is included to buffer writes to the journal file,
-** which can be a significant performance improvement on some embedded
-** platforms.
-**
-** OVERVIEW
-**
-** The code in this file implements a minimal SQLite VFS that can be
-** used on Linux and other posix-like operating systems. The following
-** system calls are used:
-**
-** File-system: access(), unlink(), getcwd()
-** File IO: open(), read(), write(), fsync(), close(), fstat()
-** Other: sleep(), usleep(), time()
-**
-** The following VFS features are omitted:
-**
-** 1. File locking. The user must ensure that there is at most one
-** connection to each database when using this VFS. Multiple
-** connections to a single shared-cache count as a single connection
-** for the purposes of the previous statement.
-**
-** 2. The loading of dynamic extensions (shared libraries).
-**
-** 3. Temporary files. The user must configure SQLite to use in-memory
-** temp files when using this VFS. The easiest way to do this is to
-** compile with:
-**
-** -DSQLITE_TEMP_STORE=3
-**
-** 4. File truncation. As of version 3.6.24, SQLite may run without
-** a working xTruncate() call, providing the user does not configure
-** SQLite to use "journal_mode=truncate", or use both
-** "journal_mode=persist" and ATTACHed databases.
-**
-** It is assumed that the system uses UNIX-like path-names. Specifically,
-** that '/' characters are used to separate path components and that
-** a path-name is a relative path unless it begins with a '/'. And that
-** no UTF-8 encoded paths are greater than 512 bytes in length.
-**
-** JOURNAL WRITE-BUFFERING
-**
-** To commit a transaction to the database, SQLite first writes rollback
-** information into the journal file. This usually consists of 4 steps:
-**
-** 1. The rollback information is sequentially written into the journal
-** file, starting at the start of the file.
-** 2. The journal file is synced to disk.
-** 3. A modification is made to the first few bytes of the journal file.
-** 4. The journal file is synced to disk again.
-**
-** Most of the data is written in step 1 using a series of calls to the
-** VFS xWrite() method. The buffers passed to the xWrite() calls are of
-** various sizes. For example, as of version 3.6.24, when committing a
-** transaction that modifies 3 pages of a database file that uses 4096
-** byte pages residing on a media with 512 byte sectors, SQLite makes
-** eleven calls to the xWrite() method to create the rollback journal,
-** as follows:
-**
-** Write offset | Bytes written
-** ----------------------------
-** 0 512
-** 512 4
-** 516 4096
-** 4612 4
-** 4616 4
-** 4620 4096
-** 8716 4
-** 8720 4
-** 8724 4096
-** 12820 4
-** ++++++++++++SYNC+++++++++++
-** 0 12
-** ++++++++++++SYNC+++++++++++
-**
-** On many operating systems, this is an efficient way to write to a file.
-** However, on some embedded systems that do not cache writes in OS
-** buffers it is much more efficient to write data in blocks that are
-** an integer multiple of the sector-size in size and aligned at the
-** start of a sector.
-**
-** To work around this, the code in this file allocates a fixed size
-** buffer of SQLITE_DEMOVFS_BUFFERSZ using sqlite3_malloc() whenever a
-** journal file is opened. It uses the buffer to coalesce sequential
-** writes into aligned SQLITE_DEMOVFS_BUFFERSZ blocks. When SQLite
-** invokes the xSync() method to sync the contents of the file to disk,
-** all accumulated data is written out, even if it does not constitute
-** a complete block. This means the actual IO to create the rollback
-** journal for the example transaction above is this:
-**
-** Write offset | Bytes written
-** ----------------------------
-** 0 8192
-** 8192 4632
-** ++++++++++++SYNC+++++++++++
-** 0 12
-** ++++++++++++SYNC+++++++++++
-**
-** Much more efficient if the underlying OS is not caching write
-** operations.
-*/
-
-#if !defined(SQLITE_TEST) || SQLITE_OS_UNIX
-
-#include <sqlite3.h>
-
-#include <assert.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/file.h>
-#include <sys/param.h>
-#include <unistd.h>
-#include <time.h>
-#include <errno.h>
-#include <fcntl.h>
-
-/*
-** Size of the write buffer used by journal files in bytes.
-*/
-#ifndef SQLITE_DEMOVFS_BUFFERSZ
-# define SQLITE_DEMOVFS_BUFFERSZ 8192
-#endif
-
-/*
-** The maximum pathname length supported by this VFS.
-*/
-#define MAXPATHNAME 512
-
-/*
-** When using this VFS, the sqlite3_file* handles that SQLite uses are
-** actually pointers to instances of type DemoFile.
-*/
-typedef struct DemoFile DemoFile;
-struct DemoFile {
- sqlite3_file base; /* Base class. Must be first. */
- int fd; /* File descriptor */
-
- char *aBuffer; /* Pointer to malloc'd buffer */
- int nBuffer; /* Valid bytes of data in zBuffer */
- sqlite3_int64 iBufferOfst; /* Offset in file of zBuffer[0] */
-};
-
-/*
-** Write directly to the file passed as the first argument. Even if the
-** file has a write-buffer (DemoFile.aBuffer), ignore it.
-*/
-static int demoDirectWrite(
- DemoFile *p, /* File handle */
- const void *zBuf, /* Buffer containing data to write */
- int iAmt, /* Size of data to write in bytes */
- sqlite_int64 iOfst /* File offset to write to */
-){
- off_t ofst; /* Return value from lseek() */
- size_t nWrite; /* Return value from write() */
-
- ofst = lseek(p->fd, iOfst, SEEK_SET);
- if( ofst!=iOfst ){
- return SQLITE_IOERR_WRITE;
- }
-
- nWrite = write(p->fd, zBuf, iAmt);
- if( nWrite!=iAmt ){
- return SQLITE_IOERR_WRITE;
- }
-
- return SQLITE_OK;
-}
-
-/*
-** Flush the contents of the DemoFile.aBuffer buffer to disk. This is a
-** no-op if this particular file does not have a buffer (i.e. it is not
-** a journal file) or if the buffer is currently empty.
-*/
-static int demoFlushBuffer(DemoFile *p){
- int rc = SQLITE_OK;
- if( p->nBuffer ){
- rc = demoDirectWrite(p, p->aBuffer, p->nBuffer, p->iBufferOfst);
- p->nBuffer = 0;
- }
- return rc;
-}
-
-/*
-** Close a file.
-*/
-static int demoClose(sqlite3_file *pFile){
- int rc;
- DemoFile *p = (DemoFile*)pFile;
- rc = demoFlushBuffer(p);
- sqlite3_free(p->aBuffer);
- close(p->fd);
- return rc;
-}
-
-/*
-** Read data from a file.
-*/
-static int demoRead(
- sqlite3_file *pFile,
- void *zBuf,
- int iAmt,
- sqlite_int64 iOfst
-){
- DemoFile *p = (DemoFile*)pFile;
- off_t ofst; /* Return value from lseek() */
- int nRead; /* Return value from read() */
- int rc; /* Return code from demoFlushBuffer() */
-
- /* Flush any data in the write buffer to disk in case this operation
- ** is trying to read data the file-region currently cached in the buffer.
- ** It would be possible to detect this case and possibly save an
- ** unnecessary write here, but in practice SQLite will rarely read from
- ** a journal file when there is data cached in the write-buffer.
- */
- rc = demoFlushBuffer(p);
- if( rc!=SQLITE_OK ){
- return rc;
- }
-
- ofst = lseek(p->fd, iOfst, SEEK_SET);
- if( ofst!=iOfst ){
- return SQLITE_IOERR_READ;
- }
- nRead = read(p->fd, zBuf, iAmt);
-
- if( nRead==iAmt ){
- return SQLITE_OK;
- }else if( nRead>=0 ){
- return SQLITE_IOERR_SHORT_READ;
- }
-
- return SQLITE_IOERR_READ;
-}
-
-/*
-** Write data to a crash-file.
-*/
-static int demoWrite(
- sqlite3_file *pFile,
- const void *zBuf,
- int iAmt,
- sqlite_int64 iOfst
-){
- DemoFile *p = (DemoFile*)pFile;
-
- if( p->aBuffer ){
- char *z = (char *)zBuf; /* Pointer to remaining data to write */
- int n = iAmt; /* Number of bytes at z */
- sqlite3_int64 i = iOfst; /* File offset to write to */
-
- while( n>0 ){
- int nCopy; /* Number of bytes to copy into buffer */
-
- /* If the buffer is full, or if this data is not being written directly
- ** following the data already buffered, flush the buffer. Flushing
- ** the buffer is a no-op if it is empty.
- */
- if( p->nBuffer==SQLITE_DEMOVFS_BUFFERSZ || p->iBufferOfst+p->nBuffer!=i ){
- int rc = demoFlushBuffer(p);
- if( rc!=SQLITE_OK ){
- return rc;
- }
- }
- assert( p->nBuffer==0 || p->iBufferOfst+p->nBuffer==i );
- p->iBufferOfst = i - p->nBuffer;
-
- /* Copy as much data as possible into the buffer. */
- nCopy = SQLITE_DEMOVFS_BUFFERSZ - p->nBuffer;
- if( nCopy>n ){
- nCopy = n;
- }
- memcpy(&p->aBuffer[p->nBuffer], z, nCopy);
- p->nBuffer += nCopy;
-
- n -= nCopy;
- i += nCopy;
- z += nCopy;
- }
- }else{
- return demoDirectWrite(p, zBuf, iAmt, iOfst);
- }
-
- return SQLITE_OK;
-}
-
-/*
-** Truncate a file. This is a no-op for this VFS (see header comments at
-** the top of the file).
-*/
-static int demoTruncate(sqlite3_file *pFile, sqlite_int64 size){
-#if 0
- if( ftruncate(((DemoFile *)pFile)->fd, size) ) return SQLITE_IOERR_TRUNCATE;
-#endif
- return SQLITE_OK;
-}
-
-/*
-** Sync the contents of the file to the persistent media.
-*/
-static int demoSync(sqlite3_file *pFile, int flags){
- DemoFile *p = (DemoFile*)pFile;
- int rc;
-
- rc = demoFlushBuffer(p);
- if( rc!=SQLITE_OK ){
- return rc;
- }
-
- rc = fsync(p->fd);
- return (rc==0 ? SQLITE_OK : SQLITE_IOERR_FSYNC);
-}
-
-/*
-** Write the size of the file in bytes to *pSize.
-*/
-static int demoFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
- DemoFile *p = (DemoFile*)pFile;
- int rc; /* Return code from fstat() call */
- struct stat sStat; /* Output of fstat() call */
-
- /* Flush the contents of the buffer to disk. As with the flush in the
- ** demoRead() method, it would be possible to avoid this and save a write
- ** here and there. But in practice this comes up so infrequently it is
- ** not worth the trouble.
- */
- rc = demoFlushBuffer(p);
- if( rc!=SQLITE_OK ){
- return rc;
- }
-
- rc = fstat(p->fd, &sStat);
- if( rc!=0 ) return SQLITE_IOERR_FSTAT;
- *pSize = sStat.st_size;
- return SQLITE_OK;
-}
-
-/*
-** Locking functions. The xLock() and xUnlock() methods are both no-ops.
-** The xCheckReservedLock() always indicates that no other process holds
-** a reserved lock on the database file. This ensures that if a hot-journal
-** file is found in the file-system it is rolled back.
-*/
-static int demoLock(sqlite3_file *pFile, int eLock){
- return SQLITE_OK;
-}
-static int demoUnlock(sqlite3_file *pFile, int eLock){
- return SQLITE_OK;
-}
-static int demoCheckReservedLock(sqlite3_file *pFile, int *pResOut){
- *pResOut = 0;
- return SQLITE_OK;
-}
-
-/*
-** No xFileControl() verbs are implemented by this VFS.
-*/
-static int demoFileControl(sqlite3_file *pFile, int op, void *pArg){
- return SQLITE_OK;
-}
-
-/*
-** The xSectorSize() and xDeviceCharacteristics() methods. These two
-** may return special values allowing SQLite to optimize file-system
-** access to some extent. But it is also safe to simply return 0.
-*/
-static int demoSectorSize(sqlite3_file *pFile){
- return 0;
-}
-static int demoDeviceCharacteristics(sqlite3_file *pFile){
- return 0;
-}
-
-/*
-** Open a file handle.
-*/
-static int demoOpen(
- sqlite3_vfs *pVfs, /* VFS */
- const char *zName, /* File to open, or 0 for a temp file */
- sqlite3_file *pFile, /* Pointer to DemoFile struct to populate */
- int flags, /* Input SQLITE_OPEN_XXX flags */
- int *pOutFlags /* Output SQLITE_OPEN_XXX flags (or NULL) */
-){
- static const sqlite3_io_methods demoio = {
- 1, /* iVersion */
- demoClose, /* xClose */
- demoRead, /* xRead */
- demoWrite, /* xWrite */
- demoTruncate, /* xTruncate */
- demoSync, /* xSync */
- demoFileSize, /* xFileSize */
- demoLock, /* xLock */
- demoUnlock, /* xUnlock */
- demoCheckReservedLock, /* xCheckReservedLock */
- demoFileControl, /* xFileControl */
- demoSectorSize, /* xSectorSize */
- demoDeviceCharacteristics /* xDeviceCharacteristics */
- };
-
- DemoFile *p = (DemoFile*)pFile; /* Populate this structure */
- int oflags = 0; /* flags to pass to open() call */
- char *aBuf = 0;
-
- if( zName==0 ){
- return SQLITE_IOERR;
- }
-
- if( flags&SQLITE_OPEN_MAIN_JOURNAL ){
- aBuf = (char *)sqlite3_malloc(SQLITE_DEMOVFS_BUFFERSZ);
- if( !aBuf ){
- return SQLITE_NOMEM;
- }
- }
-
- if( flags&SQLITE_OPEN_EXCLUSIVE ) oflags |= O_EXCL;
- if( flags&SQLITE_OPEN_CREATE ) oflags |= O_CREAT;
- if( flags&SQLITE_OPEN_READONLY ) oflags |= O_RDONLY;
- if( flags&SQLITE_OPEN_READWRITE ) oflags |= O_RDWR;
-
- memset(p, 0, sizeof(DemoFile));
- p->fd = open(zName, oflags, 0600);
- if( p->fd<0 ){
- sqlite3_free(aBuf);
- return SQLITE_CANTOPEN;
- }
- p->aBuffer = aBuf;
-
- if( pOutFlags ){
- *pOutFlags = flags;
- }
- p->base.pMethods = &demoio;
- return SQLITE_OK;
-}
-
-/*
-** Delete the file identified by argument zPath. If the dirSync parameter
-** is non-zero, then ensure the file-system modification to delete the
-** file has been synced to disk before returning.
-*/
-static int demoDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
- int rc; /* Return code */
-
- rc = unlink(zPath);
- if( rc!=0 && errno==ENOENT ) return SQLITE_OK;
-
- if( rc==0 && dirSync ){
- int dfd; /* File descriptor open on directory */
- int i; /* Iterator variable */
- char zDir[MAXPATHNAME+1]; /* Name of directory containing file zPath */
-
- /* Figure out the directory name from the path of the file deleted. */
- sqlite3_snprintf(MAXPATHNAME, zDir, "%s", zPath);
- zDir[MAXPATHNAME] = '\0';
- for(i=strlen(zDir); i>1 && zDir[i]!='/'; i++);
- zDir[i] = '\0';
-
- /* Open a file-descriptor on the directory. Sync. Close. */
- dfd = open(zDir, O_RDONLY, 0);
- if( dfd<0 ){
- rc = -1;
- }else{
- rc = fsync(dfd);
- close(dfd);
- }
- }
- return (rc==0 ? SQLITE_OK : SQLITE_IOERR_DELETE);
-}
-
-#ifndef F_OK
-# define F_OK 0
-#endif
-#ifndef R_OK
-# define R_OK 4
-#endif
-#ifndef W_OK
-# define W_OK 2
-#endif
-
-/*
-** Query the file-system to see if the named file exists, is readable or
-** is both readable and writable.
-*/
-static int demoAccess(
- sqlite3_vfs *pVfs,
- const char *zPath,
- int flags,
- int *pResOut
-){
- int rc; /* access() return code */
- int eAccess = F_OK; /* Second argument to access() */
-
- assert( flags==SQLITE_ACCESS_EXISTS /* access(zPath, F_OK) */
- || flags==SQLITE_ACCESS_READ /* access(zPath, R_OK) */
- || flags==SQLITE_ACCESS_READWRITE /* access(zPath, R_OK|W_OK) */
- );
-
- if( flags==SQLITE_ACCESS_READWRITE ) eAccess = R_OK|W_OK;
- if( flags==SQLITE_ACCESS_READ ) eAccess = R_OK;
-
- rc = access(zPath, eAccess);
- *pResOut = (rc==0);
- return SQLITE_OK;
-}
-
-/*
-** Argument zPath points to a nul-terminated string containing a file path.
-** If zPath is an absolute path, then it is copied as is into the output
-** buffer. Otherwise, if it is a relative path, then the equivalent full
-** path is written to the output buffer.
-**
-** This function assumes that paths are UNIX style. Specifically, that:
-**
-** 1. Path components are separated by a '/'. and
-** 2. Full paths begin with a '/' character.
-*/
-static int demoFullPathname(
- sqlite3_vfs *pVfs, /* VFS */
- const char *zPath, /* Input path (possibly a relative path) */
- int nPathOut, /* Size of output buffer in bytes */
- char *zPathOut /* Pointer to output buffer */
-){
- char zDir[MAXPATHNAME+1];
- if( zPath[0]=='/' ){
- zDir[0] = '\0';
- }else{
- if( getcwd(zDir, sizeof(zDir))==0 ) return SQLITE_IOERR;
- }
- zDir[MAXPATHNAME] = '\0';
-
- sqlite3_snprintf(nPathOut, zPathOut, "%s/%s", zDir, zPath);
- zPathOut[nPathOut-1] = '\0';
-
- return SQLITE_OK;
-}
-
-/*
-** The following four VFS methods:
-**
-** xDlOpen
-** xDlError
-** xDlSym
-** xDlClose
-**
-** are supposed to implement the functionality needed by SQLite to load
-** extensions compiled as shared objects. This simple VFS does not support
-** this functionality, so the following functions are no-ops.
-*/
-static void *demoDlOpen(sqlite3_vfs *pVfs, const char *zPath){
- return 0;
-}
-static void demoDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
- sqlite3_snprintf(nByte, zErrMsg, "Loadable extensions are not supported");
- zErrMsg[nByte-1] = '\0';
-}
-static void (*demoDlSym(sqlite3_vfs *pVfs, void *pH, const char *z))(void){
- return 0;
-}
-static void demoDlClose(sqlite3_vfs *pVfs, void *pHandle){
- return;
-}
-
-/*
-** Parameter zByte points to a buffer nByte bytes in size. Populate this
-** buffer with pseudo-random data.
-*/
-static int demoRandomness(sqlite3_vfs *pVfs, int nByte, char *zByte){
- return SQLITE_OK;
-}
-
-/*
-** Sleep for at least nMicro microseconds. Return the (approximate) number
-** of microseconds slept for.
-*/
-static int demoSleep(sqlite3_vfs *pVfs, int nMicro){
- sleep(nMicro / 1000000);
- usleep(nMicro % 1000000);
- return nMicro;
-}
-
-/*
-** Set *pTime to the current UTC time expressed as a Julian day. Return
-** SQLITE_OK if successful, or an error code otherwise.
-**
-** http://en.wikipedia.org/wiki/Julian_day
-**
-** This implementation is not very good. The current time is rounded to
-** an integer number of seconds. Also, assuming time_t is a signed 32-bit
-** value, it will stop working some time in the year 2038 AD (the so-called
-** "year 2038" problem that afflicts systems that store time this way).
-*/
-static int demoCurrentTime(sqlite3_vfs *pVfs, double *pTime){
- time_t t = time(0);
- *pTime = t/86400.0 + 2440587.5;
- return SQLITE_OK;
-}
-
-/*
-** This function returns a pointer to the VFS implemented in this file.
-** To make the VFS available to SQLite:
-**
-** sqlite3_vfs_register(sqlite3_demovfs(), 0);
-*/
-sqlite3_vfs *sqlite3_demovfs(void){
- static sqlite3_vfs demovfs = {
- 1, /* iVersion */
- sizeof(DemoFile), /* szOsFile */
- MAXPATHNAME, /* mxPathname */
- 0, /* pNext */
- "demo", /* zName */
- 0, /* pAppData */
- demoOpen, /* xOpen */
- demoDelete, /* xDelete */
- demoAccess, /* xAccess */
- demoFullPathname, /* xFullPathname */
- demoDlOpen, /* xDlOpen */
- demoDlError, /* xDlError */
- demoDlSym, /* xDlSym */
- demoDlClose, /* xDlClose */
- demoRandomness, /* xRandomness */
- demoSleep, /* xSleep */
- demoCurrentTime, /* xCurrentTime */
- };
- return &demovfs;
-}
-
-#endif /* !defined(SQLITE_TEST) || SQLITE_OS_UNIX */
-
-
-#ifdef SQLITE_TEST
-
-#include <tcl.h>
-
-#if SQLITE_OS_UNIX
-static int register_demovfs(
- ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
- Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
- int objc, /* Number of arguments */
- Tcl_Obj *CONST objv[] /* Command arguments */
-){
- sqlite3_vfs_register(sqlite3_demovfs(), 1);
- return TCL_OK;
-}
-static int unregister_demovfs(
- ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
- Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
- int objc, /* Number of arguments */
- Tcl_Obj *CONST objv[] /* Command arguments */
-){
- sqlite3_vfs_unregister(sqlite3_demovfs());
- return TCL_OK;
-}
-
-/*
-** Register commands with the TCL interpreter.
-*/
-int Sqlitetest_demovfs_Init(Tcl_Interp *interp){
- Tcl_CreateObjCommand(interp, "register_demovfs", register_demovfs, 0, 0);
- Tcl_CreateObjCommand(interp, "unregister_demovfs", unregister_demovfs, 0, 0);
- return TCL_OK;
-}
-
-#else
-int Sqlitetest_demovfs_Init(Tcl_Interp *interp){ return TCL_OK; }
-#endif
-
-#endif /* SQLITE_TEST */
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