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static int move_dir(Uint32 from,Uint32 obj,Uint32 dir) {
// This function is complicated, and there may be mistakes.
Object*o;
Object*oE;
Object*oF;
Uint32 objE,objF,objLF,objRF;
Uint32 hit=0;
Uint32 hF,vol;
Uint32 vol;
Value v;
if(StackProtection()) Throw("Call stack overflow during movement");
if(obj==VOIDLINK) return 0;
o=objects[obj];
o->dir=dir=resolve_dir(obj,dir);
if(o->weight>o->inertia) goto fail;
o->inertia-=o->weight;
restart:
if(hit&0x100000) dir=o->dir;
objF=obj_dir(obj,dir);
if(objF==VOIDLINK) goto fail;
if(hit) hit=(hit&0x0C000000)|0x800;
oF=objects[objF];
hF=oF?height_at(oF->x,oF->y):0;
if(height_at(oF->x,oF->y)<=o->climb) hit|=0x200000;
if(dir&1) {
// Diagonal movement
hit|=0x80000;
objLF=obj_dir(obj,(dir+1)&7);
objRF=obj_dir(obj,(dir-1)&7);
vol=o->volume;
if(objLF!=VOIDLINK) vol+=volume_at(objects[objLF]->x,objects[objLF]->y);
if(objRF!=VOIDLINK) vol+=volume_at(objects[objRF]->x,objects[objRF]->y);
if(vol<=max_volume) {
objE=objF;
while(objE!=VOIDLINK) {
if(o->oflags&(OF_DESTROYED|OF_VISUALONLY)) break;
oE=objects[objE];
if(oE->height>0) {
hit&=0xFC287000;
v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit|0x80000));
v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit));
if(v.t) Throw("Type mismatch in HIT/HITBY");
hit=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
if(hit&8) goto fail;
if(!(hit&0x11)) {
v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit|0x80000));
v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit));
if(v.t) Throw("Type mismatch in HIT/HITBY");
hit=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
if(hit&8) goto fail;
}
}
objE=obj_below(objE);
}
if(!(hit&0x402008)) {
if((hit&0x200000) && !(hit&0x402008)) {
if(hF<=o->climb || (hit&0x200000)) {
if(hit&0x20000) goto success;
if(!oF) goto fail;
if(move_to(from,obj,oF->x,oF->y)) goto success; else goto fail;
}
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if(!(v.u&1)) v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(v.u|0x80008));
}
objE=obj_below(objE);
}
}
} else {
// Orthogonal movement
if(hit) hit=(hit&0x0C000000)|0x800;
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}
}
if(hit&0x400) goto fail;
objE=obj_below(objE);
}
if(hit&0x2008) goto fail;
if((hit&0x48000)==0x8000) goto restart;
if(!(hit&0x400000)) {
if((hit&0x200000) && !(hit&0x400000)) {
if(hF<=o->climb || (hit&0x200000)) {
if(hit&0x20000) goto success;
if(move_to(from,obj,oF->x,oF->y)) goto success; else goto fail;
}
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