extend cmath (some of the functions are dummy)

[libm] / src / cmath / cacosh.c

diff --git a/src/cmath/cacosh.c b/src/cmath/cacosh.c
index 89cbb1f..c2dfc1b 100644 (file)
--- a/src/cmath/cacosh.c
+++ b/src/cmath/cacosh.c
@@ -1,48 +1,9 @@
-/* origin: OpenBSD /usr/src/lib/libm/src/s_cacosh.c */
-/*
- * 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.
- */
-/*
- *      Complex inverse hyperbolic cosine
- *
- *
- * SYNOPSIS:
- *
- * double complex cacosh();
- * double complex z, w;
- *
- * w = cacosh (z);
- *
- *
- * DESCRIPTION:
- *
- * acosh z = i acos z .
- *
- * ACCURACY:
- *
- *                      Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE      -10,+10     30000       1.6e-14     2.1e-15
- *
- */
-
-// FIXME: reeval
-
 #include "libm.h"
 
+/* acosh(z) = i acos(z) */
+
 double complex cacosh(double complex z)
 {
-       return I * cacos(z);
+       z = cacos(z);
+       return cpack(-cimag(z), creal(z));
 }