Mercurial > gnulib
view tests/nan.h @ 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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/* Macros for not-a-number. Copyright (C) 2007-2019 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/>. */ /* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The former does not support NaN and its isnan() implementation returns zero for all values. */ #if defined __MVS__ && defined __IBMC__ && !defined __BFP__ # error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee" #endif /* NaNf () returns a 'float' not-a-number. */ /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains. PGI 16.10 complains. */ #if (defined __DECC || defined _MSC_VER \ || (defined __MVS__ && defined __IBMC__) \ || defined __PGI) static float NaNf () { static float zero = 0.0f; return zero / zero; } #else # define NaNf() (0.0f / 0.0f) #endif /* NaNd () returns a 'double' not-a-number. */ /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains. PGI 16.10 complains. */ #if (defined __DECC || defined _MSC_VER \ || (defined __MVS__ && defined __IBMC__) \ || defined __PGI) static double NaNd () { static double zero = 0.0; return zero / zero; } #else # define NaNd() (0.0 / 0.0) #endif /* NaNl () returns a 'long double' not-a-number. */ /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the runtime type conversion. The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L. The IBM XL C compiler on z/OS complains. PGI 16.10 complains. */ #ifdef __sgi static long double NaNl () { double zero = 0.0; return zero / zero; } #elif defined _MSC_VER || (defined __MVS__ && defined __IBMC__) || defined __PGI static long double NaNl () { static long double zero = 0.0L; return zero / zero; } #else # define NaNl() (0.0L / 0.0L) #endif