105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
/*
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* Scyther : An automatic verifier for security protocols.
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* Copyright (C) 2007-2013 Cas Cremers
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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// @file warshall.c
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/* Based on public-domain code from Berkeley Yacc */
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#include "warshall.h"
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void
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transitive_closure (unsigned int *R, int n)
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{
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register int rowsize;
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register unsigned mask;
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register unsigned *rowj;
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register unsigned *rp;
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register unsigned *rend;
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register unsigned *ccol;
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register unsigned *relend;
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register unsigned *cword;
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register unsigned *rowi;
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rowsize = WORDSIZE (n);
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relend = R + n * rowsize;
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cword = R;
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mask = 1;
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rowi = R;
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while (rowi < relend)
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{
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ccol = cword;
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rowj = R;
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while (rowj < relend)
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{
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if (*ccol & mask)
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{
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rp = rowi;
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rend = rowj + rowsize;
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while (rowj < rend)
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*rowj++ |= *rp++;
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}
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else
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{
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rowj += rowsize;
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}
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ccol += rowsize;
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}
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mask <<= 1;
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if (mask == 0)
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{
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mask = 1;
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cword++;
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}
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rowi += rowsize;
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}
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}
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void
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reflexive_transitive_closure (unsigned int *R, int n)
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{
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register int rowsize;
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register unsigned mask;
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register unsigned *rp;
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register unsigned *relend;
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transitive_closure (R, n);
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rowsize = WORDSIZE (n);
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relend = R + n * rowsize;
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mask = 1;
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rp = R;
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while (rp < relend)
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{
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*rp |= mask;
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mask <<= 1;
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if (mask == 0)
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{
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mask = 1;
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rp++;
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}
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rp += rowsize;
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}
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}
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