forked from KolibriOS/kolibrios
8e0821a737
Porting completed (demo VFS adapted for KolibriOS). Now it can be used) git-svn-id: svn://kolibrios.org@8931 a494cfbc-eb01-0410-851d-a64ba20cac60
609 lines
17 KiB
C
609 lines
17 KiB
C
#if !defined(SQLITE_TEST) || _KOLIBRI
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#include "sqlite3.h"
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#include <assert.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <time.h>
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#include <errno.h>
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#include <fcntl.h>
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/*
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** Size of the write buffer used by journal files in bytes.
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*/
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#ifndef SQLITE_DEMOVFS_BUFFERSZ
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# define SQLITE_DEMOVFS_BUFFERSZ 8192
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#endif
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/*
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** The maximum pathname length supported by this VFS.
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*/
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#define MAXPATHNAME 512
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sqlite3_vfs *sqlite3_kosvfs(void);
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/*
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** When using this VFS, the sqlite3_file* handles that SQLite uses are
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** actually pointers to instances of type KosFile.
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*/
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typedef struct KosFile KosFile;
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struct KosFile {
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sqlite3_file base; /* Base class. Must be first. */
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int fd; /* File descriptor */
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char *aBuffer; /* Pointer to malloc'd buffer */
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int nBuffer; /* Valid bytes of data in zBuffer */
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sqlite3_int64 iBufferOfst; /* Offset in file of zBuffer[0] */
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};
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/*
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** Write directly to the file passed as the first argument. Even if the
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** file has a write-buffer (KosFile.aBuffer), ignore it.
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*/
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static int kosDirectWrite(
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KosFile *p, /* File handle */
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const void *zBuf, /* Buffer containing data to write */
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int iAmt, /* Size of data to write in bytes */
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sqlite_int64 iOfst /* File offset to write to */
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){
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off_t ofst; /* Return value from lseek() */
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size_t nWrite; /* Return value from write() */
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ofst = lseek(p->fd, iOfst, SEEK_SET);
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if( ofst!=iOfst ){
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return SQLITE_IOERR_WRITE;
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}
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nWrite = write(p->fd, zBuf, iAmt);
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if( nWrite!=iAmt ){
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return SQLITE_IOERR_WRITE;
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}
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return SQLITE_OK;
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}
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/*
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** Flush the contents of the KosFile.aBuffer buffer to disk. This is a
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** no-op if this particular file does not have a buffer (i.e. it is not
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** a journal file) or if the buffer is currently empty.
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*/
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int sqlite3_os_init(){
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return sqlite3_vfs_register(sqlite3_kosvfs(), 0);
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}
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static int kosFlushBuffer(KosFile *p){
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int rc = SQLITE_OK;
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if( p->nBuffer ){
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rc = kosDirectWrite(p, p->aBuffer, p->nBuffer, p->iBufferOfst);
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p->nBuffer = 0;
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}
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return rc;
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}
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/*
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** Close a file.
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*/
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static int kosClose(sqlite3_file *pFile){
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int rc;
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KosFile *p = (KosFile*)pFile;
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rc = kosFlushBuffer(p);
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sqlite3_free(p->aBuffer);
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close(p->fd);
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return rc;
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}
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/*
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** Read data from a file.
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*/
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static int kosRead(
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sqlite3_file *pFile,
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void *zBuf,
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int iAmt,
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sqlite_int64 iOfst
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){
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KosFile *p = (KosFile*)pFile;
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off_t ofst; /* Return value from lseek() */
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int nRead; /* Return value from read() */
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int rc; /* Return code from kosFlushBuffer() */
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/* Flush any data in the write buffer to disk in case this operation
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** is trying to read data the file-region currently cached in the buffer.
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** It would be possible to detect this case and possibly save an
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** unnecessary write here, but in practice SQLite will rarely read from
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** a journal file when there is data cached in the write-buffer.
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*/
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rc = kosFlushBuffer(p);
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if( rc!=SQLITE_OK ){
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return rc;
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}
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ofst = lseek(p->fd, iOfst, SEEK_SET);
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if( ofst!=iOfst ){
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return SQLITE_IOERR_READ;
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}
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nRead = read(p->fd, zBuf, iAmt);
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if( nRead==iAmt ){
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return SQLITE_OK;
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}else if( nRead>=0 ){
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if( nRead<iAmt ){
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memset(&((char*)zBuf)[nRead], 0, iAmt-nRead);
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}
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return SQLITE_IOERR_SHORT_READ;
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}
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return SQLITE_IOERR_READ;
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}
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/*
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** Write data to a crash-file.
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*/
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static int kosWrite(
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sqlite3_file *pFile,
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const void *zBuf,
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int iAmt,
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sqlite_int64 iOfst
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){
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KosFile *p = (KosFile*)pFile;
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if( p->aBuffer ){
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char *z = (char *)zBuf; /* Pointer to remaining data to write */
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int n = iAmt; /* Number of bytes at z */
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sqlite3_int64 i = iOfst; /* File offset to write to */
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while( n>0 ){
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int nCopy; /* Number of bytes to copy into buffer */
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/* If the buffer is full, or if this data is not being written directly
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** following the data already buffered, flush the buffer. Flushing
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** the buffer is a no-op if it is empty.
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*/
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if( p->nBuffer==SQLITE_DEMOVFS_BUFFERSZ || p->iBufferOfst+p->nBuffer!=i ){
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int rc = kosFlushBuffer(p);
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if( rc!=SQLITE_OK ){
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return rc;
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}
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}
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assert( p->nBuffer==0 || p->iBufferOfst+p->nBuffer==i );
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p->iBufferOfst = i - p->nBuffer;
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/* Copy as much data as possible into the buffer. */
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nCopy = SQLITE_DEMOVFS_BUFFERSZ - p->nBuffer;
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if( nCopy>n ){
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nCopy = n;
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}
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memcpy(&p->aBuffer[p->nBuffer], z, nCopy);
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p->nBuffer += nCopy;
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n -= nCopy;
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i += nCopy;
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z += nCopy;
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}
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}else{
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return kosDirectWrite(p, zBuf, iAmt, iOfst);
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}
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return SQLITE_OK;
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}
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/*
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** Truncate a file. This is a no-op for this VFS (see header comments at
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** the top of the file).
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*/
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static int kosTruncate(sqlite3_file *pFile, sqlite_int64 size){
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#if 0
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if( ftruncate(((KosFile *)pFile)->fd, size) ) return SQLITE_IOERR_TRUNCATE;
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#endif
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return SQLITE_OK;
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}
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/*
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** Sync the contents of the file to the persistent media.
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*/
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static int kosSync(sqlite3_file *pFile, int flags){
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KosFile *p = (KosFile*)pFile;
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int rc;
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rc = kosFlushBuffer(p);
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if( rc!=SQLITE_OK ){
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return rc;
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}
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rc = fsync(p->fd);
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return (rc==0 ? SQLITE_OK : SQLITE_IOERR_FSYNC);
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}
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/*
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** Write the size of the file in bytes to *pSize.
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*/
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static int kosFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
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KosFile *p = (KosFile*)pFile;
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int rc; /* Return code from fstat() call */
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struct stat sStat; /* Output of fstat() call */
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/* Flush the contents of the buffer to disk. As with the flush in the
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** kosRead() method, it would be possible to avoid this and save a write
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** here and there. But in practice this comes up so infrequently it is
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** not worth the trouble.
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*/
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rc = kosFlushBuffer(p);
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if( rc!=SQLITE_OK ){
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return rc;
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}
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rc = fstat(p->fd, &sStat);
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if( rc!=0 ) return SQLITE_IOERR_FSTAT;
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*pSize = sStat.st_size;
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return SQLITE_OK;
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}
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/*
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** Locking functions. The xLock() and xUnlock() methods are both no-ops.
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** The xCheckReservedLock() always indicates that no other process holds
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** a reserved lock on the database file. This ensures that if a hot-journal
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** file is found in the file-system it is rolled back.
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*/
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static int kosLock(sqlite3_file *pFile, int eLock){
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return SQLITE_OK;
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}
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static int kosUnlock(sqlite3_file *pFile, int eLock){
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return SQLITE_OK;
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}
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static int kosCheckReservedLock(sqlite3_file *pFile, int *pResOut){
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*pResOut = 0;
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return SQLITE_OK;
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}
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/*
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** No xFileControl() verbs are implemented by this VFS.
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*/
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static int kosFileControl(sqlite3_file *pFile, int op, void *pArg){
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return SQLITE_NOTFOUND;
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}
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/*
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** The xSectorSize() and xDeviceCharacteristics() methods. These two
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** may return special values allowing SQLite to optimize file-system
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** access to some extent. But it is also safe to simply return 0.
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*/
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static int kosSectorSize(sqlite3_file *pFile){
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return 0;
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}
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static int kosDeviceCharacteristics(sqlite3_file *pFile){
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return 0;
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}
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/*
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** Open a file handle.
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*/
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static int kosOpen(
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sqlite3_vfs *pVfs, /* VFS */
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const char *zName, /* File to open, or 0 for a temp file */
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sqlite3_file *pFile, /* Pointer to KosFile struct to populate */
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int flags, /* Input SQLITE_OPEN_XXX flags */
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int *pOutFlags /* Output SQLITE_OPEN_XXX flags (or NULL) */
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){
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static const sqlite3_io_methods kosio = {
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1, /* iVersion */
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kosClose, /* xClose */
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kosRead, /* xRead */
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kosWrite, /* xWrite */
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kosTruncate, /* xTruncate */
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kosSync, /* xSync */
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kosFileSize, /* xFileSize */
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kosLock, /* xLock */
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kosUnlock, /* xUnlock */
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kosCheckReservedLock, /* xCheckReservedLock */
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kosFileControl, /* xFileControl */
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kosSectorSize, /* xSectorSize */
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kosDeviceCharacteristics /* xDeviceCharacteristics */
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};
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KosFile *p = (KosFile*)pFile; /* Populate this structure */
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int oflags = 0; /* flags to pass to open() call */
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char *aBuf = 0;
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if( zName==0 ){
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return SQLITE_IOERR;
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}
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if( flags&SQLITE_OPEN_MAIN_JOURNAL ){
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aBuf = (char *)sqlite3_malloc(SQLITE_DEMOVFS_BUFFERSZ);
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if( !aBuf ){
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return SQLITE_NOMEM;
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}
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}
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if( flags&SQLITE_OPEN_EXCLUSIVE ) oflags |= O_EXCL;
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if( flags&SQLITE_OPEN_CREATE ) oflags |= O_CREAT;
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if( flags&SQLITE_OPEN_READONLY ) oflags |= O_RDONLY;
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if( flags&SQLITE_OPEN_READWRITE ) oflags |= O_RDWR;
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memset(p, 0, sizeof(KosFile));
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p->fd = open(zName, oflags, 0600);
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if( p->fd<0 ){
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sqlite3_free(aBuf);
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return SQLITE_CANTOPEN;
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}
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p->aBuffer = aBuf;
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if( pOutFlags ){
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*pOutFlags = flags;
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}
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p->base.pMethods = &kosio;
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return SQLITE_OK;
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}
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/*
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** Delete the file identified by argument zPath. If the dirSync parameter
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** is non-zero, then ensure the file-system modification to delete the
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** file has been synced to disk before returning.
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*/
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static int kosDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
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int rc; /* Return code */
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rc = unlink(zPath);
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if( rc!=0 && errno==ENOENT ) return SQLITE_OK;
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if( rc==0 && dirSync ){
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int dfd; /* File descriptor open on directory */
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int i; /* Iterator variable */
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char zDir[MAXPATHNAME+1]; /* Name of directory containing file zPath */
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/* Figure out the directory name from the path of the file deleted. */
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sqlite3_snprintf(MAXPATHNAME, zDir, "%s", zPath);
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zDir[MAXPATHNAME] = '\0';
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for(i=strlen(zDir); i>1 && zDir[i]!='/'; i++);
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zDir[i] = '\0';
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/* Open a file-descriptor on the directory. Sync. Close. */
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dfd = open(zDir, O_RDONLY, 0);
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if( dfd<0 ){
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rc = -1;
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}else{
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rc = fsync(dfd);
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close(dfd);
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}
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}
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return (rc==0 ? SQLITE_OK : SQLITE_IOERR_DELETE);
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}
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#ifndef F_OK
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# define F_OK 0
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#endif
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#ifndef R_OK
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# define R_OK 4
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#endif
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#ifndef W_OK
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# define W_OK 2
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#endif
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/*
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** Query the file-system to see if the named file exists, is readable or
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** is both readable and writable.
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*/
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static int kosAccess(
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sqlite3_vfs *pVfs,
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const char *zPath,
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int flags,
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int *pResOut
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){
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int rc; /* access() return code */
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int eAccess = F_OK; /* Second argument to access() */
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assert( flags==SQLITE_ACCESS_EXISTS /* access(zPath, F_OK) */
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|| flags==SQLITE_ACCESS_READ /* access(zPath, R_OK) */
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|| flags==SQLITE_ACCESS_READWRITE /* access(zPath, R_OK|W_OK) */
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);
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if( flags==SQLITE_ACCESS_READWRITE ) eAccess = R_OK|W_OK;
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if( flags==SQLITE_ACCESS_READ ) eAccess = R_OK;
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rc = access(zPath, eAccess);
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*pResOut = (rc==0);
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return SQLITE_OK;
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}
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/*
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** Argument zPath points to a nul-terminated string containing a file path.
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** If zPath is an absolute path, then it is copied as is into the output
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** buffer. Otherwise, if it is a relative path, then the equivalent full
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** path is written to the output buffer.
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**
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** This function assumes that paths are UNIX style. Specifically, that:
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**
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** 1. Path components are separated by a '/'. and
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** 2. Full paths begin with a '/' character.
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*/
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static int kosFullPathname(
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sqlite3_vfs *pVfs, /* VFS */
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const char *zPath, /* Input path (possibly a relative path) */
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int nPathOut, /* Size of output buffer in bytes */
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char *zPathOut /* Pointer to output buffer */
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){
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char zDir[MAXPATHNAME+1];
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if( zPath[0]=='/' ){
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zDir[0] = '\0';
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}else{
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if( getcwd(zDir, sizeof(zDir))==0 ) return SQLITE_IOERR;
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}
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zDir[MAXPATHNAME] = '\0';
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sqlite3_snprintf(nPathOut, zPathOut, "%s/%s", zDir, zPath);
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zPathOut[nPathOut-1] = '\0';
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return SQLITE_OK;
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}
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/*
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** The following four VFS methods:
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**
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** xDlOpen
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** xDlError
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** xDlSym
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** xDlClose
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**
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** are supposed to implement the functionality needed by SQLite to load
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** extensions compiled as shared objects. This simple VFS does not support
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** this functionality, so the following functions are no-ops.
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*/
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static void *kosDlOpen(sqlite3_vfs *pVfs, const char *zPath){
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return 0;
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}
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static void kosDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
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sqlite3_snprintf(nByte, zErrMsg, "Loadable extensions are not supported");
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zErrMsg[nByte-1] = '\0';
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}
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static void (*kosDlSym(sqlite3_vfs *pVfs, void *pH, const char *z))(void){
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return 0;
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}
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static void kosDlClose(sqlite3_vfs *pVfs, void *pHandle){
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return;
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}
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/*
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** Parameter zByte points to a buffer nByte bytes in size. Populate this
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** buffer with pseudo-random data.
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*/
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static int kosRandomness(sqlite3_vfs *pVfs, int nByte, char *zByte){
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return SQLITE_OK;
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}
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/*
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** Sleep for at least nMicro microseconds. Return the (approximate) number
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** of microseconds slept for.
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*/
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static int kosSleep(sqlite3_vfs *pVfs, int nMicro){
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sleep(nMicro / 1000000);
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usleep(nMicro % 1000000);
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return nMicro;
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}
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/*
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** Set *pTime to the current UTC time expressed as a Julian day. Return
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** SQLITE_OK if successful, or an error code otherwise.
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**
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** http://en.wikipedia.org/wiki/Julian_day
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**
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** This implementation is not very good. The current time is rounded to
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** an integer number of seconds. Also, assuming time_t is a signed 32-bit
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** value, it will stop working some time in the year 2038 AD (the so-called
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** "year 2038" problem that afflicts systems that store time this way).
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*/
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static int kosCurrentTime(sqlite3_vfs *pVfs, double *pTime){
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time_t t = time(0);
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*pTime = t/86400.0 + 2440587.5;
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return SQLITE_OK;
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}
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/*
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** This function returns a pointer to the VFS implemented in this file.
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** To make the VFS available to SQLite:
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**
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** sqlite3_vfs_register(sqlite3_kosvfs(), 0);
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*/
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sqlite3_vfs *sqlite3_kosvfs(void){
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static sqlite3_vfs kosvfs = {
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1, /* iVersion */
|
|
sizeof(KosFile), /* szOsFile */
|
|
MAXPATHNAME, /* mxPathname */
|
|
0, /* pNext */
|
|
"kos", /* zName */
|
|
0, /* pAppData */
|
|
kosOpen, /* xOpen */
|
|
kosDelete, /* xDelete */
|
|
kosAccess, /* xAccess */
|
|
kosFullPathname, /* xFullPathname */
|
|
kosDlOpen, /* xDlOpen */
|
|
kosDlError, /* xDlError */
|
|
kosDlSym, /* xDlSym */
|
|
kosDlClose, /* xDlClose */
|
|
kosRandomness, /* xRandomness */
|
|
kosSleep, /* xSleep */
|
|
kosCurrentTime, /* xCurrentTime */
|
|
};
|
|
return &kosvfs;
|
|
}
|
|
|
|
SQLITE_API int sqlite3_os_end(void){
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
void _ksys_sleep(unsigned time)
|
|
{
|
|
__asm__ __volatile__(
|
|
"int $0x40"
|
|
::"a"(5), "b"(time)
|
|
:"memory");
|
|
};
|
|
|
|
unsigned sleep(unsigned time){
|
|
_ksys_sleep(time*100);
|
|
return 0;
|
|
}
|
|
|
|
int usleep(useconds_t usec){
|
|
_ksys_sleep(usec);
|
|
return 0;
|
|
}
|
|
|
|
int fsync(int fd){
|
|
return 0;
|
|
}
|
|
|
|
|
|
#endif /* !defined(SQLITE_TEST) || SQLITE_OS_UNIX */
|
|
|
|
|
|
#ifdef SQLITE_TEST
|
|
|
|
#if defined(INCLUDE_SQLITE_TCL_H)
|
|
# include "sqlite_tcl.h"
|
|
#else
|
|
# include "tcl.h"
|
|
# ifndef SQLITE_TCLAPI
|
|
# define SQLITE_TCLAPI
|
|
# endif
|
|
#endif
|
|
|
|
#if SQLITE_OS_UNIX
|
|
static int SQLITE_TCLAPI register_kosvfs(
|
|
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_kosvfs(), 1);
|
|
return TCL_OK;
|
|
}
|
|
static int SQLITE_TCLAPI unregister_kosvfs(
|
|
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_kosvfs());
|
|
return TCL_OK;
|
|
}
|
|
|
|
/*
|
|
** Register commands with the TCL interpreter.
|
|
*/
|
|
int Sqlitetest_kosvfs_Init(Tcl_Interp *interp){
|
|
Tcl_CreateObjCommand(interp, "register_kosvfs", register_kosvfs, 0, 0);
|
|
Tcl_CreateObjCommand(interp, "unregister_kosvfs", unregister_kosvfs, 0, 0);
|
|
return TCL_OK;
|
|
}
|
|
|
|
#else
|
|
int Sqlitetest_kosvfs_Init(Tcl_Interp *interp){ return TCL_OK; }
|
|
#endif
|
|
|
|
#endif /* SQLITE_TEST */
|