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/* $OpenBSD: file_media.c,v 1.39 2016/01/23 03:46:18 krw Exp $ */
/*
* file_media.c -
*
* Written by Eryk Vershen
*/
/*
* Copyright 1997,1998 by Apple Computer, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h> /* DEV_BSIZE */
#include <err.h>
#include <stdio.h>
#include <unistd.h>
#include "file_media.h"
int
read_block(int fd, uint64_t sector, void *address)
{
ssize_t off;
off = pread(fd, address, DEV_BSIZE, sector * DEV_BSIZE);
if (off == DEV_BSIZE)
return (1);
if (off == 0)
fprintf(stderr, "end of file encountered");
else if (off == -1)
warn("reading file failed");
else
fprintf(stderr, "short read");
return (0);
}
int
write_block(int fd, uint64_t sector, void *address)
{
ssize_t off;
off = pwrite(fd, address, DEV_BSIZE, sector * DEV_BSIZE);
if (off == DEV_BSIZE)
return (1);
warn("writing to file failed");
return (0);
}
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