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Annotation of embedaddon/tmux/compat/bitstring.h, revision 1.1

1.1     ! misho       1: /*     $OpenBSD: bitstring.h,v 1.5 2003/06/02 19:34:12 millert Exp $   */
        !             2: /*     $NetBSD: bitstring.h,v 1.5 1997/05/14 15:49:55 pk Exp $ */
        !             3: 
        !             4: /*
        !             5:  * Copyright (c) 1989, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to Berkeley by
        !             9:  * Paul Vixie.
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  * 3. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  *
        !            35:  *     @(#)bitstring.h 8.1 (Berkeley) 7/19/93
        !            36:  */
        !            37: 
        !            38: #ifndef _BITSTRING_H_
        !            39: #define        _BITSTRING_H_
        !            40: 
        !            41: /* modified for SV/AT and bitstring bugfix by M.R.Murphy, 11oct91
        !            42:  * bitstr_size changed gratuitously, but shorter
        !            43:  * bit_alloc   spelling error fixed
        !            44:  * the following were efficient, but didn't work, they've been made to
        !            45:  * work, but are no longer as efficient :-)
        !            46:  * bit_nclear, bit_nset, bit_ffc, bit_ffs
        !            47:  */
        !            48: typedef        unsigned char bitstr_t;
        !            49: 
        !            50: /* internal macros */
        !            51:                                /* byte of the bitstring bit is in */
        !            52: #define        _bit_byte(bit) \
        !            53:        ((bit) >> 3)
        !            54: 
        !            55:                                /* mask for the bit within its byte */
        !            56: #define        _bit_mask(bit) \
        !            57:        (1 << ((bit)&0x7))
        !            58: 
        !            59: /* external macros */
        !            60:                                /* bytes in a bitstring of nbits bits */
        !            61: #define        bitstr_size(nbits) \
        !            62:        (((nbits) + 7) >> 3)
        !            63: 
        !            64:                                /* allocate a bitstring */
        !            65: #define        bit_alloc(nbits) \
        !            66:        (bitstr_t *)calloc((size_t)bitstr_size(nbits), sizeof(bitstr_t))
        !            67: 
        !            68:                                /* allocate a bitstring on the stack */
        !            69: #define        bit_decl(name, nbits) \
        !            70:        ((name)[bitstr_size(nbits)])
        !            71: 
        !            72:                                /* is bit N of bitstring name set? */
        !            73: #define        bit_test(name, bit) \
        !            74:        ((name)[_bit_byte(bit)] & _bit_mask(bit))
        !            75: 
        !            76:                                /* set bit N of bitstring name */
        !            77: #define        bit_set(name, bit) \
        !            78:        ((name)[_bit_byte(bit)] |= _bit_mask(bit))
        !            79: 
        !            80:                                /* clear bit N of bitstring name */
        !            81: #define        bit_clear(name, bit) \
        !            82:        ((name)[_bit_byte(bit)] &= ~_bit_mask(bit))
        !            83: 
        !            84:                                /* clear bits start ... stop in bitstring */
        !            85: #define        bit_nclear(name, start, stop) do { \
        !            86:        register bitstr_t *_name = name; \
        !            87:        register int _start = start, _stop = stop; \
        !            88:        while (_start <= _stop) { \
        !            89:                bit_clear(_name, _start); \
        !            90:                _start++; \
        !            91:                } \
        !            92: } while(0)
        !            93: 
        !            94:                                /* set bits start ... stop in bitstring */
        !            95: #define        bit_nset(name, start, stop) do { \
        !            96:        register bitstr_t *_name = name; \
        !            97:        register int _start = start, _stop = stop; \
        !            98:        while (_start <= _stop) { \
        !            99:                bit_set(_name, _start); \
        !           100:                _start++; \
        !           101:                } \
        !           102: } while(0)
        !           103: 
        !           104:                                /* find first bit clear in name */
        !           105: #define        bit_ffc(name, nbits, value) do { \
        !           106:        register bitstr_t *_name = name; \
        !           107:        register int _bit, _nbits = nbits, _value = -1; \
        !           108:        for (_bit = 0; _bit < _nbits; ++_bit) \
        !           109:                if (!bit_test(_name, _bit)) { \
        !           110:                        _value = _bit; \
        !           111:                        break; \
        !           112:                } \
        !           113:        *(value) = _value; \
        !           114: } while(0)
        !           115: 
        !           116:                                /* find first bit set in name */
        !           117: #define        bit_ffs(name, nbits, value) do { \
        !           118:        register bitstr_t *_name = name; \
        !           119:        register int _bit, _nbits = nbits, _value = -1; \
        !           120:        for (_bit = 0; _bit < _nbits; ++_bit) \
        !           121:                if (bit_test(_name, _bit)) { \
        !           122:                        _value = _bit; \
        !           123:                        break; \
        !           124:                } \
        !           125:        *(value) = _value; \
        !           126: } while(0)
        !           127: 
        !           128: #endif /* !_BITSTRING_H_ */