forked from KolibriOS/kolibrios
a73bea0da8
set_file_size: watcom-specific implementation git-svn-id: svn://kolibrios.org@727 a494cfbc-eb01-0410-851d-a64ba20cac60
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include <stdio.h>
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#include <io.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "iomode.h"
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#include "fileacc.h"
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#include "rtcheck.h"
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#include "rtdata.h"
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#include "seterrno.h"
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#include "lseek.h"
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#include "kolibri.h"
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typedef struct
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{
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char *name;
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unsigned int offset;
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}__file_handle;
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_WCRTLINK int read( int handle, void *buf, unsigned len )
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{
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unsigned read_len, total_len;
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unsigned reduce_idx, finish_idx;
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unsigned iomode_flags;
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char *buffer = buf;
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BOOL rc;
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HANDLE h;
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unsigned amount_read;
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int err;
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__file_handle *fh;
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__handle_check( handle, -1 );
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__ChkTTYIOMode( handle );
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iomode_flags = __GetIOMode( handle );
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if( iomode_flags == 0 )
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{
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__set_errno( EBADF );
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return( -1 );
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}
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if( !(iomode_flags & _READ) )
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{
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__set_errno( EACCES ); /* changed from EBADF to EACCES 23-feb-89 */
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return( -1 );
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}
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fh = (__file_handle*) __getOSHandle( handle );
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if( iomode_flags & _BINARY ) /* if binary mode */
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{
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err=read_file(fh->name,buffer,fh->offset,len,&amount_read);
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fh->offset+=amount_read;
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total_len = amount_read;
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if(err)
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if ( amount_read == 0)
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return (-1);
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}
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else
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{
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total_len = 0;
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read_len = len;
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do
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{
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err=read_file(fh->name,buffer,fh->offset,len,&amount_read);
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fh->offset+=amount_read;
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if( amount_read == 0 )
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break; /* EOF */
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reduce_idx = 0;
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finish_idx = reduce_idx;
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for( ; reduce_idx < amount_read; ++reduce_idx )
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{
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if( buffer[ reduce_idx ] == 0x1a ) /* EOF */
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{
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__lseek( handle,
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((long)reduce_idx - (long)amount_read)+1L,
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SEEK_CUR );
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total_len += finish_idx;
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return( total_len );
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}
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if( buffer[ reduce_idx ] != '\r' )
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{
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buffer[ finish_idx++ ] = buffer[ reduce_idx ];
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};
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}
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total_len += finish_idx;
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buffer += finish_idx;
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read_len -= finish_idx;
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if( iomode_flags & _ISTTY )
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{
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break; /* 04-feb-88, FWC */
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}
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} while( read_len != 0 );
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}
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return( total_len );
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}
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