int readline(FILE *f,char *buffer,size_t len)
{
   char c; 
   int i;

   memset(buffer,len);

   for (i = 0; i < len; i++)
   {   
      int c = fgetc(f); 

      if (!feof(f)) 
      {   
         if (c == '\r')
            buffer[i] = 0;
         else if (c == '\n')
         {   
            buffer[i] = 0;

            return i+1;
         }   
         else
            buffer[i] = c; 
      }   
      else
      {   
         //fprintf(stderr,"read_line(): recv returned %d\n",c);
         return -1; 
      }   
   }   

   return -1; 
}