199767f8919635c4928607450d9e0abb932109ceToomas Soome/*
199767f8919635c4928607450d9e0abb932109ceToomas Soome * $NetBSD: pread.c,v 1.2 1997/03/22 01:48:38 thorpej Exp $
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome/*-
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 1996
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Matthias Drochner. All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * are met:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome * documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 3. All advertising materials mentioning features or use of this software
199767f8919635c4928607450d9e0abb932109ceToomas Soome * must display the following acknowledgement:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * This product includes software developed for the NetBSD Project
199767f8919635c4928607450d9e0abb932109ceToomas Soome * by Matthias Drochner.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 4. The name of the author may not be used to endorse or promote products
199767f8919635c4928607450d9e0abb932109ceToomas Soome * derived from this software without specific prior written permission.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
199767f8919635c4928607450d9e0abb932109ceToomas Soome * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/cdefs.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome__FBSDID("$FreeBSD$");
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome/* read into destination in flat addr space */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <stand.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include "libi386.h"
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifdef SAVE_MEMORY
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define BUFSIZE (1*1024)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#else
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define BUFSIZE (4*1024)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic char buf[BUFSIZE];
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomeint
199767f8919635c4928607450d9e0abb932109ceToomas Soomepread(fd, dest, size)
199767f8919635c4928607450d9e0abb932109ceToomas Soome int fd;
199767f8919635c4928607450d9e0abb932109ceToomas Soome vm_offset_t dest;
199767f8919635c4928607450d9e0abb932109ceToomas Soome int size;
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome int rsize;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome rsize = size;
199767f8919635c4928607450d9e0abb932109ceToomas Soome while (rsize > 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome int count, got;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome count = (rsize < BUFSIZE ? rsize : BUFSIZE);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome got = read(fd, buf, count);
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (got < 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* put to physical space */
199767f8919635c4928607450d9e0abb932109ceToomas Soome vpbcopy(buf, dest, got);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome dest += got;
199767f8919635c4928607450d9e0abb932109ceToomas Soome rsize -= got;
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (got < count)
199767f8919635c4928607450d9e0abb932109ceToomas Soome break; /* EOF */
199767f8919635c4928607450d9e0abb932109ceToomas Soome }
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (size - rsize);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}