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-rw-r--r--sysdeps/generic/s_cacosh.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/generic/s_cacosh.c b/sysdeps/generic/s_cacosh.c
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+++ b/sysdeps/generic/s_cacosh.c
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+/* Return arc hyperbole cosine for double value.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <complex.h>
+#include <math.h>
+
+
+__complex__ double
+__cacosh (__complex__ double x)
+{
+ __complex__ double res;
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
+ {
+ if (icls == FP_INFINITE)
+ {
+ __real__ res = HUGE_VAL;
+
+ if (rcls == FP_NAN)
+ __imag__ res = __nan ("");
+ else
+ __imag__ res = __copysign ((rcls == FP_INFINITE
+ ? (__real__ x < 0.0
+ ? M_PI - M_PI_4 : M_PI_4)
+ : M_PI_2), __imag__ x);
+ }
+ else if (rcls == FP_INFINITE)
+ {
+ __real__ res = HUGE_VAL;
+
+ if (icls >= FP_ZERO)
+ __imag__ res = __copysign (signbit (__real__ x) ? M_PI : 0.0,
+ __imag__ x);
+ else
+ __imag__ res = __nan ("");
+ }
+ else
+ {
+ __real__ res = __nan ("");
+ __imag__ res = __nan ("");
+ }
+ }
+ else if (rcls == FP_ZERO && icls == FP_ZERO)
+ {
+ __real__ res = 0.0;
+ __imag__ res = __copysign (M_PI_2, __imag__ x);
+ }
+ else
+ {
+ __complex__ double y;
+
+ __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0;
+ __imag__ y = 2.0 * __real__ x * __imag__ x;
+
+ y = __csqrt (y);
+
+ __real__ y += __real__ x;
+ __imag__ y += __imag__ x;
+
+ res = __clog (y);
+ }
+
+ return res;
+}
+weak_alias (__cacosh, cacosh)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__cacosh, __cacoshl)
+weak_alias (__cacosh, cacoshl)
+#endif