1 /* 2 BAREOS® - Backup Archiving REcovery Open Sourced 3 4 Copyright (C) 2000-2006 Free Software Foundation Europe e.V. 5 Copyright (C) 2014-2016 Bareos GmbH & Co. KG 6 7 This program is Free Software; you can redistribute it and/or 8 modify it under the terms of version three of the GNU Affero General Public 9 License as published by the Free Software Foundation and included 10 in the file LICENSE. 11 12 This program is distributed in the hope that it will be useful, but 13 WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 Affero General Public License for more details. 16 17 You should have received a copy of the GNU Affero General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 20 02110-1301, USA. 21 */ 22 /* 23 * Kern Sibbald, MM 24 */ 25 /* 26 * Some elementary bit manipulations 27 * NOTE: base 0 28 */ 29 30 #ifndef BAREOS_LIB_BITS_H_ 31 #define BAREOS_LIB_BITS_H_ 32 33 /* 34 * Number of bytes to hold n bits 35 */ 36 #define NbytesForBits(n) ((((n) - 1) >> 3) + 1) 37 38 /* 39 * Test if bit is set 40 */ 41 #define BitIsSet(b, var) (((var)[(b) >> 3] & (1 << ((b) & 0x7))) != 0) 42 43 /* 44 * Set bit 45 */ 46 #define SetBit(b, var) ((var)[(b) >> 3] |= (1 << ((b) & 0x7))) 47 48 /* 49 * Clear bit 50 */ 51 #define ClearBit(b, var) ((var)[(b) >> 3] &= ~(1 << ((b) & 0x7))) 52 53 /* 54 * Clear all bits 55 */ 56 #define ClearAllBits(b, var) memset((var), 0, NbytesForBits((b))) 57 58 /* 59 * Set range of bits 60 */ 61 #define SetBits(f, l, var) { \ 62 int bit; \ 63 for (bit = (f); bit <= (l); bit++) \ 64 SetBit(bit, (var)); \ 65 } 66 67 /* 68 * Clear range of bits 69 */ 70 #define ClearBits(f, l, var) { \ 71 int bit; \ 72 for (bit = (f); bit <= (l); bit++) \ 73 ClearBit(bit, (var)); \ 74 } 75 76 /* 77 * Clone all set bits from var1 to var2 78 */ 79 #define CopySetBits(l, var1, var2) { \ 80 int bit; \ 81 for (bit = 0; bit <= (l); bit++) \ 82 if (BitIsSet(bit, (var1))) \ 83 SetBit(bit, (var2)); \ 84 } 85 86 /* 87 * Copy all bits from var1 to var2 88 */ 89 #define CopyBits(b, var1, var2) memcpy((var2), (var1), NbytesForBits((b))) 90 91 #endif /* BAREOS_LIB_BITS_H_ */ 92