Mercurial > gnulib
view lib/ilogb.c @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +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> #include <limits.h> #ifdef USE_LONG_DOUBLE # define ILOGB ilogbl # define DOUBLE long double # define L_(literal) literal##L # define FREXP frexpl # define ISNAN isnanl #elif ! defined USE_FLOAT # define ILOGB ilogb # define DOUBLE double # define L_(literal) literal # define FREXP frexp # define ISNAN isnand #else /* defined USE_FLOAT */ # define ILOGB ilogbf # define DOUBLE float # define L_(literal) literal##f # define FREXP frexpf # define ISNAN isnanf #endif int ILOGB (DOUBLE x) { if (isfinite (x)) { if (x == L_(0.0)) return FP_ILOGB0; else { int e; (void) FREXP (x, &e); return e - 1; } } else { if (ISNAN (x)) return FP_ILOGBNAN; else return INT_MAX; } }