From fbe0b0b37a4aef5df7ce97084cb620a45804d471 Mon Sep 17 00:00:00 2001 From: Bruno Haible Date: Sat, 15 Oct 2011 02:13:44 +0200 Subject: [PATCH] Tests for module 'integer_length'. * modules/integer_length-tests: New file. * tests/test-integer_length.c: New file. --- ChangeLog | 4 +++ modules/integer_length-tests | 11 ++++++++ tests/test-integer_length.c | 66 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 81 insertions(+) create mode 100644 modules/integer_length-tests create mode 100644 tests/test-integer_length.c diff --git a/ChangeLog b/ChangeLog index 03a78f786..5366cd393 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,9 @@ 2011-10-14 Bruno Haible + Tests for module 'integer_length'. + * modules/integer_length-tests: New file. + * tests/test-integer_length.c: New file. + New module 'integer_length'. * lib/integer_length.h: New file. * lib/integer_length.c: New file. diff --git a/modules/integer_length-tests b/modules/integer_length-tests new file mode 100644 index 000000000..e03ef57d2 --- /dev/null +++ b/modules/integer_length-tests @@ -0,0 +1,11 @@ +Files: +tests/test-integer_length.c +tests/macros.h + +Depends-on: + +configure.ac: + +Makefile.am: +TESTS += test-integer_length +check_PROGRAMS += test-integer_length diff --git a/tests/test-integer_length.c b/tests/test-integer_length.c new file mode 100644 index 000000000..b1655011f --- /dev/null +++ b/tests/test-integer_length.c @@ -0,0 +1,66 @@ +/* Test of integer_length(). + Copyright (C) 2011 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 + +#include "integer_length.h" + +#include + +#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; +} -- 2.11.0