view lib/logf.c @ 15863:c2fa2febdb1f

New module 'logf'. * lib/math.in.h (logf): New declaration. * lib/logf.c: New file. * m4/logf.m4: New file. * m4/math_h.m4 (gl_MATH_H): Test whether logf is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_LOGF, HAVE_LOGF. * modules/math (Makefile.am): Substitute GNULIB_LOGF, HAVE_LOGF. * modules/logf: New file. * tests/test-math-c++.cc: Check the declaration of logf. * doc/posix-functions/logf.texi: Mention the new module.
author Bruno Haible <bruno@clisp.org>
date Sat, 08 Oct 2011 22:18:44 +0200 (2011-10-08)
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children 8250f2777afc
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/* Natural logarithmic function.
   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>

float
logf (float x)
{
  return (float) log ((double) x);
}