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/* deledgeg.c version 1.4; B D McKay, Jan 2015. */
#define USAGE "deledgeg [-lq] [-d#] [-z] [infile [outfile]]"
#define HELPTEXT \
" For each edge e, output G-e\n\
\n\
The output file has a header if and only if the input file does.\n\
\n\
-z Consider as digraph and delete directed edges\n\
-l Canonically label outputs\n\
-d# Specify a lower bound on the minimum out-degree of the output\n\
-q Suppress auxiliary information\n"
/*************************************************************************/
#include "gtools.h"
/**************************************************************************/
int
main(int argc, char *argv[])
{
char *infilename,*outfilename;
FILE *infile,*outfile;
boolean badargs,dolabel,quiet,dswitch;
boolean digraph;
int i,j,m,n,v,w,argnum;
int codetype,outcode;
graph *g,*gq;
nauty_counter nin,nout;
char *arg,sw;
setword *gv,*gw;
int mindeg,actmindeg,degv;
boolean zswitch;
double t;
#if MAXN
graph h[MAXN*MAXM];
int deg[MAXN];
#else
DYNALLSTAT(graph,h,h_sz);
DYNALLSTAT(int,deg,deg_sz);
#endif
HELP; PUTVERSION;
infilename = outfilename = NULL;
badargs = FALSE;
zswitch = dswitch = dolabel = 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('l',dolabel)
else SWBOOLEAN('z',zswitch)
else SWBOOLEAN('q',quiet)
else SWINT('d',dswitch,mindeg,">E deledgeg -d")
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 deledgeg");
if (dolabel || zswitch) fprintf(stderr," -");
if (dolabel) fprintf(stderr,"l");
if (zswitch) fprintf(stderr,"z");
if (dswitch) fprintf(stderr," -d%d",mindeg);
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);
}
if (!dswitch) mindeg = 0;
if (dolabel) nauty_check(WORDSIZE,1,1,NAUTYVERSIONID);
nin = nout = 0;
t = CPUTIME;
while (TRUE)
{
if ((g = readgg(infile,NULL,0,&m,&n,&digraph)) == NULL) break;
++nin;
#if !MAXN
DYNALLOC1(int,deg,deg_sz,n,"deledgeg");
#endif
actmindeg = n;
for (v = 0, gv = g; v < n; ++v, gv += m)
{
degv = 0;
for (i = 0; i < m; ++i)
degv += POPCOUNT(gv[i]);
if (degv < actmindeg) actmindeg = degv;
deg[v] = degv;
}
if (actmindeg < mindeg) continue;
if (zswitch || digraph)
{
for (v = 0, gv = g; v < n; ++v, gv += m)
{
if (deg[v] <= mindeg) continue;
for (w = -1; (w = nextelement(gv,m,w)) >= 0; )
{
DELELEMENT(gv,w);
gq = g;
if (dolabel)
{
#if !MAXN
DYNALLOC2(graph,h,h_sz,n,m,"deledgeg");
#endif
fcanonise(g,m,n,h,NULL,TRUE);
gq = h;
}
writed6(outfile,gq,m,n);
++nout;
ADDELEMENT(gv,w);
}
}
}
else
{
for (v = 0, gv = g; v < n; ++v, gv += m)
{
if (deg[v] <= mindeg) continue;
for (w = v-1; (w = nextelement(gv,m,w)) >= 0; )
{
if (deg[w] <= mindeg || (w == v && deg[w] <= mindeg+1)) continue;
gw = GRAPHROW(g,w,m);
DELELEMENT(gv,w);
DELELEMENT(gw,v);
gq = g;
if (dolabel)
{
#if !MAXN
DYNALLOC2(graph,h,h_sz,n,m,"deledgeg");
#endif
fcanonise(g,m,n,h,NULL,FALSE);
gq = h;
}
if (outcode == SPARSE6) writes6(outfile,gq,m,n);
else writeg6(outfile,gq,m,n);
++nout;
ADDELEMENT(gv,w);
ADDELEMENT(gw,v);
}
}
}
FREES(g);
}
t = CPUTIME - t;
if (!quiet)
fprintf(stderr,
">Z " COUNTER_FMT " graphs read from %s, "
COUNTER_FMT " written to %s; %3.2f sec.\n",
nin,infilename,nout,outfilename,t);
exit(0);
}
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