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106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Bitset primitives used by the parser generator */
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#include "pgenheaders.h"
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#include "bitset.h"
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bitset
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newbitset(nbits)
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int nbits;
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{
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int nbytes = NBYTES(nbits);
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bitset ss = PyMem_NEW(BYTE, nbytes);
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if (ss == NULL)
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Py_FatalError("no mem for bitset");
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ss += nbytes;
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while (--nbytes >= 0)
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*--ss = 0;
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return ss;
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}
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void
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delbitset(ss)
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bitset ss;
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{
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PyMem_DEL(ss);
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}
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int
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addbit(ss, ibit)
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bitset ss;
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int ibit;
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{
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int ibyte = BIT2BYTE(ibit);
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BYTE mask = BIT2MASK(ibit);
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if (ss[ibyte] & mask)
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return 0; /* Bit already set */
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ss[ibyte] |= mask;
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return 1;
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}
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#if 0 /* Now a macro */
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int
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testbit(ss, ibit)
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bitset ss;
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int ibit;
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{
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return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0;
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}
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#endif
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int
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samebitset(ss1, ss2, nbits)
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bitset ss1, ss2;
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int nbits;
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{
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int i;
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for (i = NBYTES(nbits); --i >= 0; )
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if (*ss1++ != *ss2++)
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return 0;
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return 1;
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}
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void
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mergebitset(ss1, ss2, nbits)
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bitset ss1, ss2;
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int nbits;
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{
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int i;
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for (i = NBYTES(nbits); --i >= 0; )
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*ss1++ |= *ss2++;
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}
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