shithub: asif

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path/bfs: update for new vec api and same improvements

--- a/path/bfs.c

+++ b/path/bfs.c

@@ -27,9 +27,8 @@

 {

 	static Node *suc[8+1];

 	static dtab[2*(nelem(suc)-1)]={

-		-1,-1, 0,-1, 1,-1,

-		-1,0, 1,0,

-		-1,1, 0,1, 1,1,

+		0,-1, 1,0, 0,1, -1,0,

+		1,-1, 1,1, -1,1, -1,-1,

 	};

 	int i;

 	Node *s, **np;

@@ -83,16 +82,16 @@

 static Node *

 bfs(Node *a, Node *b)

 {

-	Vector v;

+	Vector *v;

 	Node *x, *s, **sl;

 	assert(a != nil && b != nil);

 	assert(a != b);

+	v = vec(sizeof a);

 	x = a;

-	newvec(&v, manhdist(a, b), sizeof a);

-	pushvec(&v, a);

-	while(v.n > 0){

-		x = popvec(&v);

+	vecpush(v, &x);

+	while(v->len > 0){

+		x = *((Node **)vechpop(v));

 		if(x == b)

 			break;

 		x->closed = 1;

@@ -99,14 +98,14 @@

 		if((sl = successorfn(x)) == nil)

 			sysfatal("bfs: %r");

 		for(s=*sl++; s!=nil; s=*sl++){

-			if(s->closed || s->open)

+			if(s->open)

 				continue;

 			s->from = x;

-			pushvec(&v, s);

+			vecpush(v, &s);

 			s->open = 1;

 		}

 	}

-	freevec(&v);

+	vecfree(v);

 	return x;

 }

@@ -113,11 +112,15 @@

 static int

 findpath(void)

 {

-	if(start == nil || goal == nil)

+	if(start == nil || goal == nil){

+		werrstr("findpath: start and/or goal undefined");

 		return -1;

+	}

 	resetmap();

-	if(bfs(start, goal) != goal)

+	if(bfs(start, goal) != goal){

+		werrstr("findpath: failed");

 		return -1;

+	}

 	backtrack();

 	return 0;

 }

@@ -126,8 +129,8 @@

 mouseinput(Node *n, Mouse m)

 {

 	switch(m.buttons & 7){

-	case 1: if(start != n) goal = n; return findpath();

-	case 2: if(goal != n) start = n; return findpath();

+	case 1: if(goal != n) start = n; return findpath();

+	case 2: if(start != n) goal = n; return findpath();

 	case 4: n->blocked ^= 1; break;

 	}

 	return 0;