mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
|
|
* $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("$FreeBSD$");
|
|
|
|
/* 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);
|
|
}
|