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-rw-r--r--math/s_ccos.c80
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diff --git a/math/s_ccos.c b/math/s_ccos.c
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+/* Return cosine of complex 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 <fenv.h>
+#include <math.h>
+
+
+__complex__ double
+__ccos (__complex__ double x)
+{
+ __complex__ double res;
+
+ if (!isfinite (__real__ x) || __isnan (__imag__ x))
+ {
+ if (__real__ x == 0.0 || __imag__ x == 0.0)
+ {
+ __real__ res = __nan ("");
+ __imag__ res = 0.0;
+
+#ifdef FE_INVALID
+ if (__isinf (__real__ x))
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ else if (__isinf (__imag__ x))
+ {
+ __real__ res = HUGE_VAL;
+ __imag__ res = __nan ("");
+
+#ifdef FE_INVALID
+ if (__isinf (__real__ x))
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ else
+ {
+ __real__ res = __nan ("");
+ __imag__ res = __nan ("");
+
+#ifdef FE_INVALID
+ if (isfinite (__imag__ x))
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else
+ {
+ __complex__ double y;
+
+ __real__ y = -__imag__ x;
+ __imag__ y = __real__ x;
+
+ res = __ccosh (y);
+ }
+
+ return res;
+}
+weak_alias (__ccos, ccos)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__ccos, __ccosl)
+weak_alias (__ccos, ccosl)
+#endif