/*
 * HvB: Bas van der Vlies
 *  This function compare the current result with the previous run
 *  and returns:
 *    0 : if the files are the same
 *    1 : if the files differ
*/
int CompareResult(filename, prev_file)

char *filename, *prev_file; 

{ int i;
  char digest1[EVP_MAX_MD_SIZE+1];
  char digest2[EVP_MAX_MD_SIZE+1];
  int  md_len1, md_len2;
  FILE *fp;
  int rtn = 0;

  Verbose("Comparing files  %s with %s\n", prev_file, filename);

  if ((fp=fopen(prev_file,"r")) != NULL) {
      fclose(fp);

      md_len1 = FileChecksum(prev_file, digest1, 'm');
      md_len2 = FileChecksum(filename,  digest2, 'm');

      if (md_len1 != md_len2) {
	  rtn = 1;
      } else {
	  for (i = 0; i < md_len1; i++) {
	      if (digest1[i] != digest2[i]) {
		  rtn = 1;
		  break;
	      }
	  }
      }
  } else {
      rtn = 1;
  }

  /* always update the symlink. */
  unlink(prev_file);
  if (symlink(filename, prev_file) == -1 ) {
      snprintf(OUTPUT,bufsize,"Could not link %s and %s",filename,prev_file);
      CfLog(cfinform,OUTPUT,"symlink");
      rtn = 1;
  }
  return(rtn);
}