usr.sbin/dumplfs/misc.c

   1 /*      $NetBSD: misc.c,v 1.6 2001/07/13 20:30:21 perseant Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)misc.c      8.2 (Berkeley) 4/28/95";
  37 #else
  38 __RCSID("$NetBSD: misc.c,v 1.6 2001/07/13 20:30:21 perseant Exp $");
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <sys/types.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include "extern.h"
  51
  52 void
  53 get(int fd, off_t off, void *p, size_t len)
  54 {
  55         int rbytes;
  56
  57         if (lseek(fd, off, SEEK_SET) < 0)
  58                 err(1, "%s", special);
  59         if ((rbytes = read(fd, p, len)) < 0)
  60                 err(1, "%s", special);
  61         if (rbytes != len)
  62                 errx(1, "%s: short read (%d, not %lu)", special, rbytes,
  63                     (u_long)len);
  64 }