[Nauty-list] readgraph() (Susanne Nie?)

[William Rummler]

You should be using opengraphfile() and readg() from gtools.h to read
graphs generated by geng. Here is a short example program that
illustrates basic usage.

#define MAXN 30
#include "gtools.h"

int
main( void )
{
  /*
   * Variables for using with opengraphfile() and readg()
   */
  FILE *f;
  graph g[ MAXN * MAXM ];
  int codetype, m, n;

  /*
   * Example:
   * Reading graphs from standard input and printing their adjacency matrices
   */
  set *v;
  int i, j;
  f = opengraphfile( NULL, &codetype, 0, 0 );
  while( readg( f, g, 0, &m, &n ) )
    {
      for ( i = 0; i < n; ++i )
        {
          v = GRAPHROW( g, i, m );
          for ( j = 0; j < n; ++j )
            {
              printf( " %d", ISELEMENT( v, j ) ? 1 : 0 );
            }
          printf( "\n" );
        }
      printf( "\n" );
    }
  return 0;
}