shithub: libgraphics

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clip: avoid division by zero.

--- a/clip.c

+++ b/clip.c

@@ -208,11 +208,11 @@

 			p0->y += (r.max.x - p0->x)*m;

 			p0->x = r.max.x;

 		}else if(code0 & CLIPB){

-			if(p0->x != p1->x)

+			if(p0->x != p1->x && m != 0)

 				p0->x += (r.min.y - p0->y)/m;

 			p0->y = r.min.y;

 		}else if(code0 & CLIPT){

-			if(p0->x != p1->x)

+			if(p0->x != p1->x && m != 0)

 				p0->x += (r.max.y - p0->y)/m;

 			p0->y = r.max.y;

 		}