kolibrios/programs/develop/open watcom/trunk/clib/handleio/qwrit.c
Sergey Semyonov (Serge) 54786d007d Clib create_file, read_file, write_file: watcom-specific implementation
git-svn-id: svn://kolibrios.org@711 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-02-05 06:08:42 +00:00

117 lines
3.3 KiB
C

/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
* DESCRIBE IT HERE!
*
****************************************************************************/
#include "variety.h"
#include <stdio.h>
#include <errno.h>
#include "iomode.h"
#include "fileacc.h"
#include "rtcheck.h"
#include "rtdata.h"
#include "seterrno.h"
#include "qwrite.h"
#include "liballoc.h"
#include "kolibri.h"
/*
Use caution when setting the file pointer in a multithreaded
application. You must synchronize access to shared resources. For
example, an application whose threads share a file handle, update the
file pointer, and read from the file must protect this sequence by
using a critical section object or a mutex object.
*/
typedef struct
{
char *name;
unsigned int offset;
}__file_handle;
char* getfullpath(const char* path);
int __qwrite( int handle, const void *buffer, unsigned len )
{
int atomic;
__file_handle *fh;
unsigned len_written;
__handle_check( handle, -1 );
fh = (__file_handle*) __getOSHandle( handle );
atomic = 0;
if( __GetIOMode( handle ) & _APPEND )
{
FILEINFO info;
_AccessFileH( handle );
atomic = 1;
get_fileinfo(fh->name,&info);
fh->offset = info.size;
};
if(write_file(fh->name,buffer,fh->offset,len,&len_written))
{
if ( len_written == 0)
{
if( atomic == 1 )
_ReleaseFileH( handle );
return (-1);
};
};
fh->offset+=len_written;
if( atomic == 1 )
{
_ReleaseFileH( handle );
}
return( len_written );
}
/********************
int write_once(const char *name, void *buffer, unsigned len)
{ char *path;
unsigned count;
path= getfullpath(name);
write_file(path,buffer,0,len,&count);
lib_free(path);
return count;
}
*******************/