lib/libdisk/disklabel.c

   1 /*
   2  * ----------------------------------------------------------------------------
   3  * "THE BEER-WARE LICENSE" (Revision 42):
   4  * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
   5  * can do whatever you want with this stuff. If we meet some day, and you think
   6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
   7  * ----------------------------------------------------------------------------
   8  *
   9  * $FreeBSD: src/lib/libdisk/disklabel.c,v 1.5.2.3 2001/05/13 21:01:38 jkh Exp $
  10  * $DragonFly: src/lib/libdisk/Attic/disklabel.c,v 1.2 2003/06/17 04:26:49 dillon Exp $
  11  *
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <sys/disklabel.h>
  18 #include "libdisk.h"
  19
  20 struct disklabel *
  21 read_disklabel(int fd, daddr_t block, u_long sector_size)
  22 {
  23         struct disklabel *dp;
  24
  25         dp = (struct disklabel *) read_block(fd, block, sector_size);
  26         if (dp->d_magic != DISKMAGIC)
  27                 return 0;
  28         if (dp->d_magic2 != DISKMAGIC)
  29                 return 0;
  30         if (dkcksum(dp) != 0)
  31                 return 0;
  32         return dp;
  33 }