1 files changed, 90 insertions, 0 deletions
diff --git a/lib/libc/gen/fpclassify.c b/lib/libc/gen/fpclassify.c
new file mode 100644
index 00000000000..f126935961f
--- /dev/null
+++ b/lib/libc/gen/fpclassify.c
@@ -0,0 +1,90 @@
+/*	$OpenBSD: fpclassify.c,v 1.1 2008/07/24 09:31:07 martynas Exp $	*/
+/*
+ * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <machine/ieee.h>
+#include <math.h>
+
+int
+__fpclassify(double d)
+{
+	struct ieee_double *p = (struct ieee_double *)&d;
+
+	if (p->dbl_exp == 0) {
+		if (p->dbl_frach == 0 && p->dbl_fracl == 0)
+			return FP_ZERO;
+		else
+			return FP_SUBNORMAL;
+	}
+
+	if (p->dbl_exp == DBL_EXP_INFNAN) {
+		if (p->dbl_frach == 0 && p->dbl_fracl == 0)
+			return FP_INFINITE;
+		else
+			return FP_NAN;
+	}
+
+	return FP_NORMAL;
+}
+
+int
+__fpclassifyf(float f)
+{
+	struct ieee_single *p = (struct ieee_single *)&f;
+
+	if (p->sng_exp == 0) {
+		if (p->sng_frac == 0)
+			return FP_ZERO;
+		else
+			return FP_SUBNORMAL;
+	}
+
+	if (p->sng_exp == SNG_EXP_INFNAN) {
+		if (p->sng_frac == 0)
+			return FP_INFINITE;
+		else
+			return FP_NAN;
+	}
+
+	return FP_NORMAL;
+}
+
+#if 0	/* XXX */
+int
+__fpclassifyl(long double e)
+{
+	struct ieee_ext *p = (struct ieee_ext *)&e;
+
+	if (p->ext_exp == 0) {
+		if (p->ext_frach == 0 && p->ext_fracl == 0)
+			return FP_ZERO;
+		else
+			return FP_SUBNORMAL;
+	}
+
+	p->ext_frach &= ~0x80000000;	/* clear sign bit */
+
+	if (p->ext_exp == EXT_EXP_INFNAN) {
+		if (p->ext_frach == 0 && p->ext_fracl == 0)
+			return FP_INFINITE;
+		else
+			return FP_NAN;
+	}
+
+	return FP_NORMAL;
+}
+#endif	/* XXX */