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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //compat/linux/proc/self/root/usr/src/contrib/sendmail/include/sm/bitops.h |
/* * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers. * All rights reserved. * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved. * Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. * * * $Id: bitops.h,v 1.2 2001/09/22 22:05:42 ca Exp $ */ #ifndef SM_BITOPS_H # define SM_BITOPS_H /* ** Data structure for bit maps. ** ** Each bit in this map can be referenced by an ascii character. ** This is 256 possible bits, or 32 8-bit bytes. */ # define BITMAPBITS 256 /* number of bits in a bit map */ # define BYTEBITS 8 /* number of bits in a byte */ # define BITMAPBYTES (BITMAPBITS / BYTEBITS) /* number of bytes in bit map */ # define BITMAPMAX ((BITMAPBYTES / sizeof (int)) - 1) /* internal macros */ /* make sure this index never leaves the allowed range: 0 to BITMAPMAX */ # define _BITWORD(bit) (((unsigned char)(bit) / (BYTEBITS * sizeof (int))) & BITMAPMAX) # define _BITBIT(bit) ((unsigned int)1 << ((unsigned char)(bit) % (BYTEBITS * sizeof (int)))) typedef unsigned int BITMAP256[BITMAPBYTES / sizeof (int)]; /* properly case and truncate bit */ # define bitidx(bit) ((unsigned int) (bit) & 0xff) /* test bit number N */ # define bitnset(bit, map) ((map)[_BITWORD(bit)] & _BITBIT(bit)) /* set bit number N */ # define setbitn(bit, map) (map)[_BITWORD(bit)] |= _BITBIT(bit) /* clear bit number N */ # define clrbitn(bit, map) (map)[_BITWORD(bit)] &= ~_BITBIT(bit) /* clear an entire bit map */ # define clrbitmap(map) memset((char *) map, '\0', BITMAPBYTES) /* bit hacking */ # define bitset(bit, word) (((word) & (bit)) != 0) #endif /* ! SM_BITOPS_H */