+ if (!ignorant_p)
+ {
+ x = path[i].x - start_x;
+ y = path[i].y - start_y;
+ /* choice one */
+ if(abs(y) <= abs(x))
+ dir = (x > 0) ? WALL_LEFT : WALL_RIGHT;
+ else
+ dir = (y > 0) ? WALL_TOP : WALL_BOTTOM;
+
+ if(dir & ways)
+ goto found;
+
+ /* choice two */
+ switch(dir)
+ {
+ case WALL_LEFT:
+ case WALL_RIGHT:
+ dir = (y > 0) ? WALL_TOP : WALL_BOTTOM; break;
+ case WALL_TOP:
+ case WALL_BOTTOM:
+ dir = (x > 0) ? WALL_LEFT : WALL_RIGHT;
+ }
+
+ if(dir & ways)
+ goto found;
+
+ /* choice three */
+
+ dir = (dir << 2 & WALL_ANY) | (dir >> 2 & WALL_ANY);
+ if(dir & ways)
+ goto found;
+
+ /* choice four */
+ dir = ways;
+ if(!dir)
+ goto backtrack;
+
+ found:
+ }
+ else
+ {
+ if(ways&WALL_TOP)
+ dir = WALL_TOP;
+ else if(ways&WALL_LEFT)
+ dir = WALL_LEFT;
+ else if(ways&WALL_BOTTOM)
+ dir = WALL_BOTTOM;
+ else if(ways&WALL_RIGHT)
+ dir = WALL_RIGHT;
+ else
+ goto backtrack;
+ }