Mercurial > gnulib
view tests/test-integer_length_ll.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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/* Test of integer_length_ll(). Copyright (C) 2011-2019 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/>. */ #include <config.h> #include "integer_length.h" #include <limits.h> #include "macros.h" #define NBITS (sizeof (unsigned long long) * CHAR_BIT) static int naive (unsigned long long x) { int j; for (j = NBITS - 1; j >= 0; j--) if (x & (1ULL << j)) return j + 1; return 0; } int main (int argc, char *argv[]) { unsigned long x; int i; for (x = 0; x <= 256; x++) ASSERT (integer_length_ll (x) == naive (x)); for (i = 0; i < NBITS; i++) { ASSERT (integer_length_ll (1ULL << i) == naive (1ULL << i)); ASSERT (integer_length_ll (1ULL << i) == i + 1); ASSERT (integer_length_ll (-1ULL << i) == NBITS); } for (i = 0; i < NBITS - 1; i++) ASSERT (integer_length_ll (3ULL << i) == i + 2); for (i = 0; i < NBITS - 2; i++) ASSERT (integer_length_ll (-3ULL << i) == NBITS); for (i = 0; i < NBITS - 2; i++) { ASSERT (integer_length_ll (5ULL << i) == i + 3); ASSERT (integer_length_ll (7ULL << i) == i + 3); } for (i = 0; i < NBITS - 3; i++) { ASSERT (integer_length_ll (-5ULL << i) == NBITS); ASSERT (integer_length_ll (-7ULL << i) == NBITS); } return 0; }