From 8ffec2a3aba6f114784e11f89ef1d57a096ae540 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:39:29 +0200 Subject: Adding upstream version 8.32. Signed-off-by: Daniel Baumann --- gnulib-tests/null-ptr.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 gnulib-tests/null-ptr.h (limited to 'gnulib-tests/null-ptr.h') diff --git a/gnulib-tests/null-ptr.h b/gnulib-tests/null-ptr.h new file mode 100644 index 0000000..b978418 --- /dev/null +++ b/gnulib-tests/null-ptr.h @@ -0,0 +1,33 @@ +/* Return a NULL pointer, without letting the compiler know it. + Copyright (C) 2017-2020 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 . */ + +#include + +/* Return NULL. + Usual compilers are not able to infer something about the return value. */ +static void * +null_ptr (void) +{ + unsigned int x = rand (); + unsigned int y = x * x; + if (y & 2) + return (void *) -1; + else + return (void *) 0; +} + +/* If you want to know why this always returns NULL, read + https://en.wikipedia.org/wiki/Quadratic_residue#Prime_power_modulus . */ -- cgit v1.2.3