Mercurial > gnulib
view tests/test-integer_length.c @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 8250f2777afc |
children | 344018b6e5d7 |
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/* Test of integer_length(). Copyright (C) 2011-2013 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 <http://www.gnu.org/licenses/>. */ #include <config.h> #include "integer_length.h" #include <limits.h> #include "macros.h" #define NBITS (sizeof (unsigned int) * CHAR_BIT) static int naive (unsigned int x) { int j; for (j = NBITS - 1; j >= 0; j--) if (x & (1U << j)) return j + 1; return 0; } int main (int argc, char *argv[]) { unsigned int x; int i; for (x = 0; x <= 256; x++) ASSERT (integer_length (x) == naive (x)); for (i = 0; i < NBITS; i++) { ASSERT (integer_length (1U << i) == naive (1U << i)); ASSERT (integer_length (1U << i) == i + 1); ASSERT (integer_length (-1U << i) == NBITS); } for (i = 0; i < NBITS - 1; i++) ASSERT (integer_length (3U << i) == i + 2); for (i = 0; i < NBITS - 2; i++) ASSERT (integer_length (-3U << i) == NBITS); for (i = 0; i < NBITS - 2; i++) { ASSERT (integer_length (5U << i) == i + 3); ASSERT (integer_length (7U << i) == i + 3); } for (i = 0; i < NBITS - 3; i++) { ASSERT (integer_length (-5U << i) == NBITS); ASSERT (integer_length (-7U << i) == NBITS); } return 0; }