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/*
* $NetBSD: pread.c,v 1.2 1997/03/22 01:48:38 thorpej Exp $
*/
/*-
* Copyright (c) 1996
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by Matthias Drochner.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/boot/i386/libi386/pread.c 119482 2003-08-25 23:28:32Z obrien $");
/* read into destination in flat addr space */
#include <stand.h>
#include "libi386.h"
#ifdef SAVE_MEMORY
#define BUFSIZE (1*1024)
#else
#define BUFSIZE (4*1024)
#endif
static char buf[BUFSIZE];
int
pread(fd, dest, size)
int fd;
vm_offset_t dest;
int size;
{
int rsize;
rsize = size;
while (rsize > 0) {
int count, got;
count = (rsize < BUFSIZE ? rsize : BUFSIZE);
got = read(fd, buf, count);
if (got < 0)
return (-1);
/* put to physical space */
vpbcopy(buf, dest, got);
dest += got;
rsize -= got;
if (got < count)
break; /* EOF */
}
return (size - rsize);
}