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complg.c
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/* complg.c version 2.0; B D McKay, Jun 2015. */
#define USAGE "complg [-lq] [-r|-R] [infile [outfile]]"
#define HELPTEXT \
" Take the complements of a file of graphs.\n\
\n\
The output file has a header if and only if the input file does.\n\
The output format is defined by the header or first graph.\n\
\n\
-r Only complement if the complement has fewer directed edges.\n\
-R Only complement if the complement has fewer directed edges\n\
or has the same number of directed edges and is canonically\n\
less than the original.\n\
-L Complement the loops too. By default, preserve them.\n\
-l Canonically label outputs.\n\
-q Suppress auxiliary information.\n"
/*************************************************************************/
#include "gtools.h"
/**************************************************************************/
static void
compl(graph *g, int m, int n, graph *h, boolean comploops)
/* h := complement of g */
{
int i,j;
setword *gi,*hi;
#if MAXN
set all[MAXM];
#else
DYNALLSTAT(set,all,all_sz);
DYNALLOC1(set,all,all_sz,m,"complg");
#endif
EMPTYSET(all,m);
for (i = 0; i < n; ++i) ADDELEMENT(all,i);
gi = (setword*) g;
hi = (setword*) h;
for (i = 0; i < n; ++i)
{
for (j = 0; j < m; ++j) hi[j] = gi[j] ^ all[j];
if (!comploops) FLIPELEMENT(hi,i);
gi += m;
hi += m;
}
}
/**************************************************************************/
int
main(int argc, char *argv[])
{
char *infilename,*outfilename;
FILE *infile,*outfile;
boolean dolabel,badargs,restricted,Restricted,quiet;
boolean digraph,Lswitch;
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;
static graph *gq;
double t;
#if MAXN
graph gc[MAXN*MAXM],h[MAXN*MAXM],hc[MAXN*MAXM];
#else
DYNALLSTAT(graph,gc,gc_sz);
DYNALLSTAT(graph,h,h_sz);
DYNALLSTAT(graph,hc,hc_sz);
#endif
HELP; PUTVERSION;
infilename = outfilename = NULL;
dolabel = badargs = FALSE;
restricted = Restricted = quiet = Lswitch = 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('r',restricted)
else SWBOOLEAN('R',Restricted)
else SWBOOLEAN('l',dolabel)
else SWBOOLEAN('L',Lswitch)
else 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 complg");
if (restricted || Restricted || dolabel || Lswitch)
fprintf(stderr," -");
if (restricted && !Restricted) fprintf(stderr,"r");
if (Restricted) fprintf(stderr,"R");
if (dolabel) fprintf(stderr,"l");
if (Lswitch) fprintf(stderr,"L");
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);
}
nauty_check(WORDSIZE,1,1,NAUTYVERSIONID);
nin = 0;
t = CPUTIME;
while (TRUE)
{
if ((g = readgg(infile,NULL,0,&m,&n,&digraph)) == NULL) break;
++nin;
#if !MAXN
DYNALLOC2(graph,gc,gc_sz,n,m,"complg");
#endif
if (restricted || Restricted)
{
ned = loops = 0;
gwords = m * (size_t)n;
nn = n * (size_t)(n-1);
for (ii = 0; ii < gwords; ++ii) ned += POPCOUNT(g[ii]);
for (ii = 0; ii < n; ++ii) if (ISELEMENT(g+m*ii,ii)) ++loops;
if (Lswitch)
{
loopsc = n - loops;
nedc = nn + n - (ned-loops)/2;
}
else
{
loopsc = loops;
nedc = nn - (ned-3*loops)/2;
}
if (ned > nedc || (ned == nedc && !Restricted))
{
compl(g,m,n,gc,Lswitch);
if (dolabel)
{
#if !MAXN
DYNALLOC2(graph,hc,hc_sz,n,m,"complg");
#endif
fcanonise(gc,m,n,hc,NULL,digraph||loopsc>0);
gq = hc;
}
else
gq = gc;
}
else if (ned < nedc)
{
if (dolabel)
{
#if !MAXN
DYNALLOC2(graph,h,h_sz,n,m,"complg");
#endif
fcanonise(g,m,n,h,NULL,digraph||loops>0);
gq = h;
}
else
gq = g;
}
else
{
compl(g,m,n,gc,Lswitch);
#if !MAXN
DYNALLOC2(graph,h,h_sz,n,m,"complg");
DYNALLOC2(graph,hc,hc_sz,n,m,"complg");
#endif
fcanonise(g,m,n,h,NULL,digraph||loops>0);
fcanonise(gc,m,n,hc,NULL,digraph||loopsc>0);
for (ii = 0; ii < gwords; ++ii)
if (h[ii] != hc[ii]) break;
if (ii == gwords || hc[ii] < h[ii])
{
if (dolabel) gq = hc; else gq = gc;
}
else
{
if (dolabel) gq = h; else gq = g;
}
}
}
else /* Not restricted */
{
compl(g,m,n,gc,Lswitch);
if (dolabel)
{
#if !MAXN
DYNALLOC2(graph,hc,hc_sz,n,m,"complg");
#endif
fcanonise(gc,m,n,hc,NULL,digraph||loopsc>0);
gq = hc;
}
else
gq = gc;
}
if (outcode == SPARSE6) writes6(outfile,gq,m,n);
else if (outcode == DIGRAPH6) writed6(outfile,gq,m,n);
else writeg6(outfile,gq,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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