Mercurial > gnulib
view lib/sqrtl.c @ 40169:ecb43221748b
strtod, strtold: Work around HP-UX 11.31/ia64 bug.
* lib/strtod.c (STRTOD): When there is an extra character after the
exponent marker 'p', reparse the number.
* doc/posix-functions/strtod.texi: Document the HP-UX 11.31 bug.
* doc/posix-functions/strtold.texi: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 01 Feb 2019 00:18:57 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* Emulation for sqrtl. Contributed by Paolo Bonzini Copyright 2002-2003, 2007, 2009-2019 Free Software Foundation, Inc. This file is part of gnulib. 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/>. */ #include <config.h> /* Specification. */ #include <math.h> #if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE long double sqrtl (long double x) { return sqrt (x); } #else # include <float.h> /* A simple Newton-Raphson method. */ long double sqrtl (long double x) { long double delta, y; int exponent; /* Check for NaN */ if (isnanl (x)) return x; /* Check for negative numbers */ if (x < 0.0L) return (long double) sqrt (-1); /* Check for zero and infinites */ if (x + x == x) return x; frexpl (x, &exponent); y = ldexpl (x, -exponent / 2); do { delta = y; y = (y + x / y) * 0.5L; delta -= y; } while (delta != 0.0L); return y; } #endif