1 /* 2 * Copyright (C) 1993-2001 by Darren Reed. 3 * 4 * See the IPFILTER.LICENCE file for details on licencing. 5 * 6 * $Id: fill6bits.c,v 1.5 2002/03/27 15:09:57 darrenr Exp $ 7 */ 8 9 #include "ipf.h" 10 11 fill6bits(bits,msk)12void fill6bits(bits, msk) 13 int bits; 14 u_int *msk; 15 { 16 if (bits == 0) { 17 msk[0] = 0; 18 msk[1] = 0; 19 msk[2] = 0; 20 msk[3] = 0; 21 return; 22 } 23 24 msk[0] = 0xffffffff; 25 msk[1] = 0xffffffff; 26 msk[2] = 0xffffffff; 27 msk[3] = 0xffffffff; 28 29 if (bits == 128) 30 return; 31 if (bits > 96) { 32 msk[3] = htonl(msk[3] << (128 - bits)); 33 } else if (bits > 64) { 34 msk[3] = 0; 35 msk[2] = htonl(msk[2] << (96 - bits)); 36 } else if (bits > 32) { 37 msk[3] = 0; 38 msk[2] = 0; 39 msk[1] = htonl(msk[1] << (64 - bits)); 40 } else { 41 msk[3] = 0; 42 msk[2] = 0; 43 msk[1] = 0; 44 msk[0] = htonl(msk[0] << (32 - bits)); 45 } 46 } 47