97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* Return value of complex exponential function for float complex value.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <complex.h>
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#include <math.h>
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__complex__ double
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__cexp (__complex__ double x)
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{
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__complex__ double retval;
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if (isfinite (__real__ x))
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{
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if (isfinite (__imag__ x))
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{
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double exp_val = __exp (__real__ x);
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if (isfinite (exp_val))
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{
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__real__ retval = exp_val * __cos (__imag__ x);
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__imag__ retval = exp_val * __sin (__imag__ x);
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}
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else
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{
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__real__ retval = __copysign (exp_val, __cos (__imag__ x));
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__imag__ retval = __copysign (exp_val, __sin (__imag__ x));
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}
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}
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else
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{
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/* If the imaginary part is +-inf or NaN and the real part
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is not +-inf the result is NaN + iNaN. */
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__real__ retval = __nan ("");
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__imag__ retval = __nan ("");
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}
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}
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else if (__isinf (__real__ x))
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{
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if (isfinite (__imag__ x))
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{
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double value = signbit (__real__ x) ? 0.0 : HUGE_VAL;
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if (__imag__ x == 0.0)
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{
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__real__ retval = value;
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__imag__ retval = __imag__ x;
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}
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else
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{
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__real__ retval = __copysign (value, __cos (__imag__ x));
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__imag__ retval = __copysign (value, __sin (__imag__ x));
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}
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}
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else if (signbit (__real__ x) == 0)
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{
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__real__ retval = HUGE_VAL;
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__imag__ retval = __nan ("");
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}
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else
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{
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__real__ retval = 0.0;
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__imag__ retval = __copysign (0.0, __imag__ x);
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}
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}
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else
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{
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/* If the real part is NaN the result is NaN + iNaN. */
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__real__ retval = __nan ("");
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__imag__ retval = __nan ("");
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}
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return retval;
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}
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weak_alias (__cexp, cexp)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__cexp, __cexpl)
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weak_alias (__cexp, cexpl)
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#endif
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