  gray_init_cells( RAS_ARG_ void*  buffer,
                   long            byte_size )
  {
    ras.buffer      = buffer;
    ras.buffer_size = byte_size;

    ras.ycells      = (PCell*) buffer;
    ras.cells       = NULL;
    ras.max_cells   = 0;
    ras.num_cells   = 0;
    ras.area        = 0;
    ras.cover       = 0;
    ras.invalid     = 1;
  }

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.