You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.5 KiB
64 lines
1.5 KiB
4 months ago
|
/* Copyright 1996,1997,1999,2001,2002,2009 Alain Knaff.
|
||
|
|
* This file is part of mtools.
|
||
|
|
*
|
||
|
|
* Mtools is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation, either version 3 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* Mtools is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*
|
||
|
|
* Force I/O to be done to complete transfer length
|
||
|
|
*
|
||
|
|
* written by:
|
||
|
|
*
|
||
|
|
* Alain L. Knaff
|
||
|
|
* alain@knaff.lu
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "sysincludes.h"
|
||
|
|
#include "msdos.h"
|
||
|
|
#include "stream.h"
|
||
|
|
|
||
|
|
static int force_io(Stream_t *Stream,
|
||
|
|
char *buf, mt_off_t start, size_t len,
|
||
|
|
int (*io)(Stream_t *, char *, mt_off_t, size_t))
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
int done=0;
|
||
|
|
|
||
|
|
while(len){
|
||
|
|
ret = io(Stream, buf, start, len);
|
||
|
|
if ( ret <= 0 ){
|
||
|
|
if (done)
|
||
|
|
return done;
|
||
|
|
else
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
start += ret;
|
||
|
|
done += ret;
|
||
|
|
len -= ret;
|
||
|
|
buf += ret;
|
||
|
|
}
|
||
|
|
return done;
|
||
|
|
}
|
||
|
|
|
||
|
|
int force_write(Stream_t *Stream, char *buf, mt_off_t start, size_t len)
|
||
|
|
{
|
||
|
|
return force_io(Stream, buf, start, len,
|
||
|
|
Stream->Class->write);
|
||
|
|
}
|
||
|
|
|
||
|
|
int force_read(Stream_t *Stream, char *buf, mt_off_t start, size_t len)
|
||
|
|
{
|
||
|
|
return force_io(Stream, buf, start, len,
|
||
|
|
Stream->Class->read);
|
||
|
|
}
|