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converseg.c
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converseg.c
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/* converseg.c version 2.0; B D McKay, Jun 2015. */
#define USAGE "converseg [-q] [infile [outfile]]"
#define HELPTEXT \
" Take the converse digraphs of a file of graphs.\n\
\n\
The output file has a header if and only if the input file does.\n\
Undirected graphs are passed through without change, while\n\
directed graphs are written in digraph6 format.\n\
\n\
-q Suppress auxiliary information.\n"
/*************************************************************************/
#include "gtools.h"
/**************************************************************************/
static void
conv(graph *g, int m, int n)
/* Replace g by its converse */
{
int i,j;
graph *gi,*gj;
for (i = 0, gi = g; i < n; ++i, gi += m)
for (j = i+1, gj = gi+m; j < n; ++j, gj += m)
if ((ISELEMENT(gi,j)!=0) + (ISELEMENT(gj,i)!=0) == 1)
{
FLIPELEMENT(gi,j);
FLIPELEMENT(gj,i);
}
}
/**************************************************************************/
int
main(int argc, char *argv[])
{
char *infilename,*outfilename;
FILE *infile,*outfile;
boolean badargs,quiet;
boolean digraph;
int j,m,n,argnum;
int codetype,outcode;
graph *g;
// size_t ii,ned,nedc,nn,loops,loopsc,gwords;
nauty_counter nin;
char *arg,sw;
double t;
HELP; PUTVERSION;
infilename = outfilename = NULL;
badargs = FALSE;
quiet = FALSE;
argnum = 0;
badargs = FALSE;
for (j = 1; !badargs && j < argc; ++j)
{
arg = argv[j];
if (arg[0] == '-' && arg[1] != '\0')
{
++arg;
while (*arg != '\0')
{
sw = *arg++;
SWBOOLEAN('q',quiet)
else badargs = TRUE;
}
}
else
{
++argnum;
if (argnum == 1) infilename = arg;
else if (argnum == 2) outfilename = arg;
else badargs = TRUE;
}
}
if (badargs)
{
fprintf(stderr,">E Usage: %s\n",USAGE);
GETHELP;
exit(1);
}
if (!quiet)
{
fprintf(stderr,">A converseg");
if (argnum > 0) fprintf(stderr," %s",infilename);
if (argnum > 1) fprintf(stderr," %s",outfilename);
fprintf(stderr,"\n");
fflush(stderr);
}
if (infilename && infilename[0] == '-') infilename = NULL;
infile = opengraphfile(infilename,&codetype,FALSE,1);
if (!infile) exit(1);
if (!infilename) infilename = "stdin";
if (!outfilename || outfilename[0] == '-')
{
outfilename = "stdout";
outfile = stdout;
}
else if ((outfile = fopen(outfilename,"w")) == NULL)
{
fprintf(stderr,"Can't open output file %s\n",outfilename);
gt_abort(NULL);
}
if (codetype&SPARSE6) outcode = SPARSE6;
else if (codetype&DIGRAPH6) outcode = DIGRAPH6;
else outcode = GRAPH6;
if (codetype&HAS_HEADER)
{
if (outcode == SPARSE6) writeline(outfile,SPARSE6_HEADER);
else if (outcode == DIGRAPH6) writeline(outfile,DIGRAPH6_HEADER);
else writeline(outfile,GRAPH6_HEADER);
}
gtools_check(WORDSIZE,1,1,NAUTYVERSIONID);
nin = 0;
t = CPUTIME;
while (TRUE)
{
if ((g = readgg(infile,NULL,0,&m,&n,&digraph)) == NULL) break;
++nin;
if (!digraph)
writelast(outfile);
else
{
conv(g,m,n);
writed6(outfile,g,m,n);
}
FREES(g);
}
t = CPUTIME - t;
if (!quiet)
fprintf(stderr,">Z " COUNTER_FMT
" graphs converted from %s to %s in %3.2f sec.\n",
nin,infilename,outfilename,t);
exit(0);
}

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