Mercurial > gnulib
view lib/logb.c @ 40160:5c7e0484c1e9
tmpfile: Add support for Android.
* m4/tmpfile.m4 (gl_FUNC_TMPFILE): Add a runtime test whether tmpfile()
works.
* lib/tmpfile.c (tmpfile): Add an alternative implementation for
Android.
* modules/tmpfile (Depends-on): Add 'stdbool'.
* doc/posix-functions/tmpfile.texi: Mention the Android bug.
* modules/argv-iter-tests (Depends-on): Add 'tmpfile'.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 27 Jan 2019 22:03:14 +0100 |
parents | b06060465f09 |
children |
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/* Floating-point exponent. Copyright (C) 2012-2019 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 <https://www.gnu.org/licenses/>. */ #if ! (defined USE_LONG_DOUBLE || defined USE_FLOAT) # include <config.h> #endif /* Specification. */ #include <math.h> #ifdef USE_LONG_DOUBLE # define LOGB logbl # define DOUBLE long double # define L_(literal) literal##L # define HUGEVAL HUGE_VALL # define FREXP frexpl # define ISNAN isnanl #elif ! defined USE_FLOAT # define LOGB logb # define DOUBLE double # define L_(literal) literal # define HUGEVAL HUGE_VAL # define FREXP frexp # define ISNAN isnand #else /* defined USE_FLOAT */ # define LOGB logbf # define DOUBLE float # define L_(literal) literal##f # define HUGEVAL HUGE_VALF # define FREXP frexpf # define ISNAN isnanf #endif DOUBLE LOGB (DOUBLE x) { if (isfinite (x)) { if (x == L_(0.0)) /* Return -Infinity. */ return - HUGEVAL; else { int e; (void) FREXP (x, &e); return (DOUBLE) (e - 1); } } else { if (ISNAN (x)) return x; /* NaN */ else /* Return +Infinity. */ return HUGEVAL; } }