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kolibrios/programs/develop/open watcom/trunk/clib/handleio/read.c
Sergey Semyonov (Serge) a73bea0da8 Clib chsize, fstat, setmode.
set_file_size: watcom-specific implementation

git-svn-id: svn://kolibrios.org@727 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-02-10 14:10:44 +00:00

137 lines
4.0 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 <io.h>
#include <fcntl.h>
#include <errno.h>
#include "iomode.h"
#include "fileacc.h"
#include "rtcheck.h"
#include "rtdata.h"
#include "seterrno.h"
#include "lseek.h"
#include "kolibri.h"
typedef struct
{
char *name;
unsigned int offset;
}__file_handle;
_WCRTLINK int read( int handle, void *buf, unsigned len )
{
unsigned read_len, total_len;
unsigned reduce_idx, finish_idx;
unsigned iomode_flags;
char *buffer = buf;
BOOL rc;
HANDLE h;
unsigned amount_read;
int err;
__file_handle *fh;
__handle_check( handle, -1 );
__ChkTTYIOMode( handle );
iomode_flags = __GetIOMode( handle );
if( iomode_flags == 0 )
{
__set_errno( EBADF );
return( -1 );
}
if( !(iomode_flags & _READ) )
{
__set_errno( EACCES ); /* changed from EBADF to EACCES 23-feb-89 */
return( -1 );
}
fh = (__file_handle*) __getOSHandle( handle );
if( iomode_flags & _BINARY ) /* if binary mode */
{
err=read_file(fh->name,buffer,fh->offset,len,&amount_read);
fh->offset+=amount_read;
total_len = amount_read;
if(err)
if ( amount_read == 0)
return (-1);
}
else
{
total_len = 0;
read_len = len;
do
{
err=read_file(fh->name,buffer,fh->offset,len,&amount_read);
fh->offset+=amount_read;
if( amount_read == 0 )
break; /* EOF */
reduce_idx = 0;
finish_idx = reduce_idx;
for( ; reduce_idx < amount_read; ++reduce_idx )
{
if( buffer[ reduce_idx ] == 0x1a ) /* EOF */
{
__lseek( handle,
((long)reduce_idx - (long)amount_read)+1L,
SEEK_CUR );
total_len += finish_idx;
return( total_len );
}
if( buffer[ reduce_idx ] != '\r' )
{
buffer[ finish_idx++ ] = buffer[ reduce_idx ];
};
}
total_len += finish_idx;
buffer += finish_idx;
read_len -= finish_idx;
if( iomode_flags & _ISTTY )
{
break; /* 04-feb-88, FWC */
}
} while( read_len != 0 );
}
return( total_len );
}