-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
- * @(#)bitstring.h 8.1 (Berkeley) 7/19/93
+ * $FreeBSD$
*/
#ifndef _BITSTRING_H_
/* external macros */
/* bytes in a bitstring of nbits bits */
#define bitstr_size(nbits) \
- ((((nbits) - 1) >> 3) + 1)
+ (((nbits) + 7) >> 3)
/* allocate a bitstring */
#define bit_alloc(nbits) \
- (bitstr_t *)calloc(1, \
- (unsigned int)bitstr_size(nbits) * sizeof(bitstr_t))
+ (bitstr_t *)calloc((size_t)bitstr_size(nbits), sizeof(bitstr_t))
/* allocate a bitstring on the stack */
#define bit_decl(name, nbits) \
- (name)[bitstr_size(nbits)]
+ ((name)[bitstr_size(nbits)])
/* is bit N of bitstring name set? */
#define bit_test(name, bit) \
/* set bit N of bitstring name */
#define bit_set(name, bit) \
- (name)[_bit_byte(bit)] |= _bit_mask(bit)
+ ((name)[_bit_byte(bit)] |= _bit_mask(bit))
/* clear bit N of bitstring name */
#define bit_clear(name, bit) \
- (name)[_bit_byte(bit)] &= ~_bit_mask(bit)
+ ((name)[_bit_byte(bit)] &= ~_bit_mask(bit))
/* clear bits start ... stop in bitstring */
-#define bit_nclear(name, start, stop) { \
- register bitstr_t *_name = name; \
- register int _start = start, _stop = stop; \
- register int _startbyte = _bit_byte(_start); \
- register int _stopbyte = _bit_byte(_stop); \
+#define bit_nclear(name, start, stop) do { \
+ bitstr_t *_name = (name); \
+ int _start = (start), _stop = (stop); \
+ int _startbyte = _bit_byte(_start); \
+ int _stopbyte = _bit_byte(_stop); \
if (_startbyte == _stopbyte) { \
_name[_startbyte] &= ((0xff >> (8 - (_start&0x7))) | \
(0xff << ((_stop&0x7) + 1))); \
_name[_startbyte] = 0; \
_name[_stopbyte] &= 0xff << ((_stop&0x7) + 1); \
} \
-}
+} while (0)
/* set bits start ... stop in bitstring */
-#define bit_nset(name, start, stop) { \
- register bitstr_t *_name = name; \
- register int _start = start, _stop = stop; \
- register int _startbyte = _bit_byte(_start); \
- register int _stopbyte = _bit_byte(_stop); \
+#define bit_nset(name, start, stop) do { \
+ bitstr_t *_name = (name); \
+ int _start = (start), _stop = (stop); \
+ int _startbyte = _bit_byte(_start); \
+ int _stopbyte = _bit_byte(_stop); \
if (_startbyte == _stopbyte) { \
_name[_startbyte] |= ((0xff << (_start&0x7)) & \
(0xff >> (7 - (_stop&0x7)))); \
_name[_startbyte] = 0xff; \
_name[_stopbyte] |= 0xff >> (7 - (_stop&0x7)); \
} \
-}
+} while (0)
/* find first bit clear in name */
-#define bit_ffc(name, nbits, value) { \
- register bitstr_t *_name = name; \
- register int _byte, _nbits = nbits; \
- register int _stopbyte = _bit_byte(_nbits), _value = -1; \
- for (_byte = 0; _byte < _stopbyte; ++_byte) \
- if (_name[_byte] != 0xff) { \
- _value = _byte << 3; \
- for (_stopbyte = _name[_byte]; (_stopbyte&0x1); \
- ++_value, _stopbyte >>= 1); \
- break; \
- } \
+#define bit_ffc(name, nbits, value) do { \
+ bitstr_t *_name = (name); \
+ int _byte, _nbits = (nbits); \
+ int _stopbyte = _bit_byte(_nbits - 1), _value = -1; \
+ if (_nbits > 0) \
+ for (_byte = 0; _byte <= _stopbyte; ++_byte) \
+ if (_name[_byte] != 0xff) { \
+ bitstr_t _lb; \
+ _value = _byte << 3; \
+ for (_lb = _name[_byte]; (_lb&0x1); \
+ ++_value, _lb >>= 1); \
+ break; \
+ } \
+ if (_value >= nbits) \
+ _value = -1; \
*(value) = _value; \
-}
+} while (0)
/* find first bit set in name */
-#define bit_ffs(name, nbits, value) { \
- register bitstr_t *_name = name; \
- register int _byte, _nbits = nbits; \
- register int _stopbyte = _bit_byte(_nbits), _value = -1; \
- for (_byte = 0; _byte < _stopbyte; ++_byte) \
- if (_name[_byte]) { \
- _value = _byte << 3; \
- for (_stopbyte = _name[_byte]; !(_stopbyte&0x1); \
- ++_value, _stopbyte >>= 1); \
- break; \
- } \
+#define bit_ffs(name, nbits, value) do { \
+ bitstr_t *_name = (name); \
+ int _byte, _nbits = (nbits); \
+ int _stopbyte = _bit_byte(_nbits - 1), _value = -1; \
+ if (_nbits > 0) \
+ for (_byte = 0; _byte <= _stopbyte; ++_byte) \
+ if (_name[_byte]) { \
+ bitstr_t _lb; \
+ _value = _byte << 3; \
+ for (_lb = _name[_byte]; !(_lb&0x1); \
+ ++_value, _lb >>= 1); \
+ break; \
+ } \
+ if (_value >= nbits) \
+ _value = -1; \
*(value) = _value; \
-}
+} while (0)
#endif /* !_BITSTRING_H_ */
projects / apple / libc.git / blobdiff