| /* Compute complex base 10 logarithm. |

| 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> |

| |

| #include "math_private.h" |

| |

| |

| __complex__ double |

| __clog10 (__complex__ double x) |

| { |

| __complex__ double result; |

| int rcls = fpclassify (__real__ x); |

| int icls = fpclassify (__imag__ x); |

| |

| if (rcls == FP_ZERO && icls == FP_ZERO) |

| { |

| /* Real and imaginary part are 0.0. */ |

| __imag__ result = signbit (__real__ x) ? M_PI : 0.0; |

| __imag__ result = __copysign (__imag__ result, __imag__ x); |

| /* Yes, the following line raises an exception. */ |

| __real__ result = -1.0 / fabs (__real__ x); |

| } |

| else if (rcls != FP_NAN && icls != FP_NAN) |

| { |

| /* Neither real nor imaginary part is NaN. */ |

| __real__ result = __ieee754_log10 (__ieee754_hypot (__real__ x, |

| __imag__ x)); |

| __imag__ result = M_LOG10E * __ieee754_atan2 (__imag__ x, __real__ x); |

| } |

| else |

| { |

| __imag__ result = __nan (""); |

| if (rcls == FP_INFINITE || icls == FP_INFINITE) |

| /* Real or imaginary part is infinite. */ |

| __real__ result = HUGE_VAL; |

| else |

| __real__ result = __nan (""); |

| } |

| |

| return result; |

| } |

| weak_alias (__clog10, clog10) |

| #ifdef NO_LONG_DOUBLE |

| strong_alias (__clog10, __clog10l) |

| weak_alias (__clog10, clog10l) |

| #endif |