--- ray/src/rt/p_func.c	1994/01/12 16:46:50	2.3
+++ ray/src/rt/p_func.c	2003/03/05 16:16:53	2.6
@@ -1,15 +1,12 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: p_func.c,v 2.6 2003/03/05 16:16:53 greg Exp $";
 #endif
-
 /*
  *  p_func.c - routine for procedural patterns.
- *
- *     4/8/86
  */
 
+#include "copyright.h"
+
 #include  "ray.h"
 
 #include  "func.h"
@@ -50,7 +47,7 @@ RAY  *r;
 	setfunc(m, r);
 	errno = 0;
 	bval = evalue(mf->ep[0]);
-	if (errno) {
+	if (errno == EDOM || errno == ERANGE) {
 		objerror(m, WARNING, "compute error");
 		return(0);
 	}
@@ -74,7 +71,7 @@ RAY  *r;
 	setcolor(cval, evalue(mf->ep[0]),
 			evalue(mf->ep[1]),
 			evalue(mf->ep[2]));
-	if (errno) {
+	if (errno == EDOM || errno == ERANGE) {
 		objerror(m, WARNING, "compute error");
 		return(0);
 	}