text: /* Compute complex base 10 logarithm.
     Copyright (C) 1997-2012 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, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <complex.h>
  #include <math.h>
  #include <math_private.h>
  #include <float.h>
  
  /* log_10 (2).  */
  #define M_LOG10_2l 0.3010299956639811952137388947244930267682L
  
  __complex__ long double
  __clog10l (__complex__ long double x)
  {
    __complex__ long double result;
    int rcls = fpclassify (__real__ x);
    int icls = fpclassify (__imag__ x);
  
    if (__builtin_expect (rcls == FP_ZERO && icls == FP_ZERO, 0))
      {
        /* Real and imaginary part are 0.0.  */
        __imag__ result = signbit (__real__ x) ? M_PIl : 0.0;
        __imag__ result = __copysignl (__imag__ result, __imag__ x);
        /* Yes, the following line raises an exception.  */
        __real__ result = -1.0 / fabsl (__real__ x);
      }
    else if (__builtin_expect (rcls != FP_NAN && icls != FP_NAN, 1))
      {
        /* Neither real nor imaginary part is NaN.  */
        long double d;
        int scale = 0;
  
        if (fabsl (__real__ x) > LDBL_MAX / 2.0L
  	  || fabsl (__imag__ x) > LDBL_MAX / 2.0L)
  	{
  	  scale = -1;
  	  __real__ x = __scalbnl (__real__ x, scale);
  	  __imag__ x = __scalbnl (__imag__ x, scale);
  	}
        else if (fabsl (__real__ x) < LDBL_MIN
  	       && fabsl (__imag__ x) < LDBL_MIN)
  	{
  	  scale = LDBL_MANT_DIG;
  	  __real__ x = __scalbnl (__real__ x, scale);
  	  __imag__ x = __scalbnl (__imag__ x, scale);
  	}
  
        d = __ieee754_hypotl (__real__ x, __imag__ x);
  
        __real__ result = __ieee754_log10l (d) - scale * M_LOG10_2l;
        __imag__ result = M_LOG10El * __ieee754_atan2l (__imag__ x, __real__ x);
      }
    else
      {
        __imag__ result = __nanl ("");
        if (rcls == FP_INFINITE || icls == FP_INFINITE)
  	/* Real or imaginary part is infinite.  */
  	__real__ result = HUGE_VALL;
        else
  	__real__ result = __nanl ("");
      }
  
    return result;
  }
  weak_alias (__clog10l, clog10l)
  