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path: check for placement on non-free block

our map data structures kind of really suck

--- a/path.c

+++ b/path.c

@@ -75,11 +75,44 @@

 	return (*row & 1ULL << 63) != 0;

 }

+static Mobj *

+unitat(int px, int py)

+{

+	int x, y;

+	Rectangle r, mr;

+	Map *m;

+	Mobjl *ml;

+	Mobj *mo;

+

+	x = px / Node2Tile;

+	y = py / Node2Tile;

+	r = Rect(x-4, y-4, x, y);

+	for(; y>=r.min.y; y--)

+		for(x=r.max.x, m=map+y*mapwidth+x; x>=r.min.x; x--)

+			for(ml=m->ml.l; ml!=&m->ml; ml=ml->l){

+				mo = ml->mo;

+				mr.min.x = mo->x;

+				mr.min.y = mo->y;

+				mr.max.x = mr.min.x + mo->o->w;

+				mr.max.y = mr.min.y + mo->o->h;

+				if(px >= mo->x && px <= mo->x + mo->o->w

+				&& py >= mo->y && py <= mo->y + mo->o->h)

+					return mo;

+			}

+	return nil;

+}

+

 void

 markmobj(Mobj *mo, int set)

 {

 	int w, h;

+	Mobj *bmo;

+	if(isblocked(mo->x, mo->y, mo->o)){

+		bmo = unitat(mo->x, mo->y);

+		sysfatal("markmobj: attempt to place %s at %d,%d, non-free block having %s at %d,%d",

+			mo->o->name, mo->x, mo->y, bmo->o->name, bmo->x, bmo->y);

+	}

 	w = mo->o->w;

 	if((mo->subpx & Subpxmask) != 0 && mo->x != (mo->px + 1) / Nodewidth)

 		w++;