--- ray/src/rt/t_func.c	1991/11/25 09:50:59	2.2
+++ ray/src/rt/t_func.c	2004/03/30 16:13:01	2.7
@@ -1,18 +1,15 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: t_func.c,v 2.7 2004/03/30 16:13:01 schorsch Exp $";
 #endif
-
 /*
  *  t_func.c - routine for procedural textures.
- *
- *     4/8/86
  */
 
-#include  "ray.h"
+#include "copyright.h"
 
+#include  "ray.h"
 #include  "func.h"
+#include  "rtotypes.h"
 
 /*
  *	A procedural texture perturbs the surface normal
@@ -31,9 +28,11 @@ static char SCCSid[] = "$SunId$ LBL";
  */
 
 
-t_func(m, r)			/* compute texture for ray */
-register OBJREC  *m;
-register RAY  *r;
+extern int
+t_func(			/* compute texture for ray */
+	register OBJREC  *m,
+	register RAY  *r
+)
 {
 	FVECT  disp;
 	double  d;
@@ -47,9 +46,9 @@ register RAY  *r;
 	errno = 0;
 	for (i = 0; i < 3; i++) {
 		disp[i] = evalue(mf->ep[i]);
-		if (errno) {
+		if (errno == EDOM || errno == ERANGE) {
 			objerror(m, WARNING, "compute error");
-			return;
+			return(0);
 		}
 	}
 	if (mf->f != &unitxf)
@@ -61,4 +60,5 @@ register RAY  *r;
 		d = 1.0 / mf->f->sca;
 	for (i = 0; i < 3; i++)
 		r->pert[i] += disp[i] * d;
+	return(0);
 }