kc3-lang/gnulib/lib/copysign.c

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• Hash : 5835ba72
  Author :
  Date : 2011-10-09T14:44:58
  

  copysign: Provide replacement.
  
  * lib/math.in.h (copysign): New declaration.
  * lib/copysign.c: New file.
  * m4/copysign.m4: New file.
  * m4/math_h.m4 (gl_MATH_H): Test whether copysign is declared.
  (gl_MATH_H_DEFAULTS): Initialize GNULIB_COPYSIGN, HAVE_COPYSIGN.
  * modules/math (Makefile.am): Substitute GNULIB_COPYSIGN,
  HAVE_COPYSIGN.
  * modules/copysign (Description): Clarify.
  (Files): Add lib/copysign.c, m4/copysign.m4.
  (Depends-on): Add math, signbit.
  (configure.ac): Invoke gl_FUNC_COPYSIGN, AC_LIBOBJ,
  gl_MATH_MODULE_INDICATOR.
  * tests/test-math-c++.cc: Check the declaration of copysign.
  * doc/posix-functions/copysign.texi: Mention the effects of the module
  on Minix and MSVC.
  

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• lib/copysign.c

• /* Copy sign into another 'double' number.
     Copyright (C) 2011 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <math.h>
  
  double
  copysign (double x, double y)
  {
    return (signbit (x) != signbit (y) ? - x : x);
  }
  

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