minix/commands/i386/mtools-3.9.7/force_io.c
2005-04-21 14:53:53 +00:00

48 lines
852 B
C
Executable file

/*
* Force I/O to be done to complete transfer length
*
* written by:
*
* Alain L. Knaff
* alain@linux.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);
}