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/* 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);
}
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