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diff --git a/lib/libm/src/s_cexp.c b/lib/libm/src/s_cexp.c
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+/*	$OpenBSD: s_cexp.c,v 1.1 2008/09/07 20:36:09 martynas Exp $	*/
+/*
+ * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
+ *
+ * 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.
+ */
+
+/*							cexp()
+ *
+ *	Complex exponential function
+ *
+ *
+ *
+ * SYNOPSIS:
+ *
+ * double complex cexp ();
+ * double complex z, w;
+ *
+ * w = cexp (z);
+ *
+ *
+ *
+ * DESCRIPTION:
+ *
+ * Returns the exponential of the complex argument z
+ * into the complex result w.
+ *
+ * If
+ *     z = x + iy,
+ *     r = exp(x),
+ *
+ * then
+ *
+ *     w = r cos y + i r sin y.
+ *
+ *
+ * ACCURACY:
+ *
+ *                      Relative error:
+ * arithmetic   domain     # trials      peak         rms
+ *    DEC       -10,+10      8700       3.7e-17     1.1e-17
+ *    IEEE      -10,+10     30000       3.0e-16     8.7e-17
+ *
+ */
+
+#include <complex.h>
+#include <math.h>
+
+double complex
+cexp(double complex z)
+{
+	double complex w;
+	double r, x, y;
+
+	x = creal (z);
+	y = cimag (z);
+	r = exp (x);
+	w = r * cos (y) + r * sin (y) * I;
+	return (w);
+}