+ static int8_t wrap_west_east = 0;
+ static int8_t wrap_north_south = 0;
+ if (!yx)
+ {
+ wrap_west_east = wrap_north_south = 0;
+ return 0;
+ }
+ char * err = "Too much wrapping in mv_yx_in_dir_legal().";
+ exit_err( INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south
+ || INT8_MAX == wrap_west_east || INT8_MAX == wrap_north_south, err);
+ struct yx_uint8 original;
+ original.y = yx->y;
+ original.x = yx->x;
+ mv_yx_in_dir(dir, yx);
+ if (('e' == dir || 'd' == dir || 'c' == dir) && yx->x < original.x)
+ {
+ wrap_west_east++;
+ }
+ else if (('x' == dir || 's' == dir || 'w' == dir) && yx->x > original.x)