1 files changed, 57 insertions, 0 deletions
diff --git a/contrib/sendmail/include/sm/bitops.h b/contrib/sendmail/include/sm/bitops.h
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+++ b/contrib/sendmail/include/sm/bitops.h
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+/*
+ * 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 */