Include/bitset.h

   1 #ifndef Py_BITSET_H
   2 #define Py_BITSET_H
   3 #ifdef __cplusplus
   4 extern "C" {
   5 #endif
   6
   7 /***********************************************************
   8 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
   9 The Netherlands.
  10
  11                         All Rights Reserved
  12
  13 Permission to use, copy, modify, and distribute this software and its
  14 documentation for any purpose and without fee is hereby granted,
  15 provided that the above copyright notice appear in all copies and that
  16 both that copyright notice and this permission notice appear in
  17 supporting documentation, and that the names of Stichting Mathematisch
  18 Centrum or CWI or Corporation for National Research Initiatives or
  19 CNRI not be used in advertising or publicity pertaining to
  20 distribution of the software without specific, written prior
  21 permission.
  22
  23 While CWI is the initial source for this software, a modified version
  24 is made available by the Corporation for National Research Initiatives
  25 (CNRI) at the Internet address ftp://ftp.python.org.
  26
  27 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  28 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  29 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  30 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  31 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  32 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  33 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  34 PERFORMANCE OF THIS SOFTWARE.
  35
  36 ******************************************************************/
  37
  38 /* Bitset interface */
  39
  40 #define BYTE            char
  41
  42 typedef BYTE *bitset;
  43
  44 bitset newbitset Py_PROTO((int nbits));
  45 void delbitset Py_PROTO((bitset bs));
  46 #define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0)
  47 int addbit Py_PROTO((bitset bs, int ibit)); /* Returns 0 if already set */
  48 int samebitset Py_PROTO((bitset bs1, bitset bs2, int nbits));
  49 void mergebitset Py_PROTO((bitset bs1, bitset bs2, int nbits));
  50
  51 #define BITSPERBYTE     (8*sizeof(BYTE))
  52 #define NBYTES(nbits)   (((nbits) + BITSPERBYTE - 1) / BITSPERBYTE)
  53
  54 #define BIT2BYTE(ibit)  ((ibit) / BITSPERBYTE)
  55 #define BIT2SHIFT(ibit) ((ibit) % BITSPERBYTE)
  56 #define BIT2MASK(ibit)  (1 << BIT2SHIFT(ibit))
  57 #define BYTE2BIT(ibyte) ((ibyte) * BITSPERBYTE)
  58
  59 #ifdef __cplusplus
  60 }
  61 #endif
  62 #endif /* !Py_BITSET_H */