86 lines
1.3 KiB
C
86 lines
1.3 KiB
C
// @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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