Add a not-a-number test, based on Ben Harris's infinity test.

Disabled on vax.

regress/lib/libc/ieeefp/Makefile

@@ -1,7 +1,11 @@
-#	$NetBSD: Makefile,v 1.9 2001/10/27 23:36:32 bjh21 Exp $
+#	$NetBSD: Makefile,v 1.10 2001/10/28 10:41:56 simonb Exp $
 
 # Don't hook up testfloat just yet. (ross, 2001.3.12)
 
 SUBDIR+= except infinity round
+.if ${MACHINE} != "vax"
+SUBDIR+= nan
+.endif
+
 
 .include <bsd.subdir.mk>

regress/lib/libc/ieeefp/nan/Makefile

@@ -0,0 +1,9 @@
+#	$NetBSD: Makefile,v 1.1 2001/10/28 10:41:56 simonb Exp $
+
+PROG=	nan
+MKMAN=	no
+
+regress: ${PROG}
+	./${PROG}
+
+.include <bsd.prog.mk>

regress/lib/libc/ieeefp/nan/nan.c

@@ -0,0 +1,28 @@
+/*	$NetBSD: nan.c,v 1.1 2001/10/28 10:41:56 simonb Exp $	*/
+
+/*
+ * This file is in the Public Domain.
+ *
+ * Blatently copied from the infinity test by Ben Harris.
+ *
+ * Simon Burge, 2001
+ */
+
+/*
+ * Check that NAN (alias __nanf) really is not-a-number.
+ * Alternatively, check that isnan() minimally works.
+ */
+
+#include <err.h>
+#include <math.h>
+#include <stdlib.h>
+
+int
+main(int argc, char **argv)
+{
+
+	/* NAN is meant to be an infinity. */
+	if (!isnan(NAN))
+		errx(1, "NAN is a number");
+	return 0;
+}