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stdlib: Add testcases for labs(). (BZ #30263)

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Test minimum and maximum long values, zero, and part of the range
of long values.  Use '-fno-builtin' to ensure we are testing the
implementation.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Joe Simmons-Talbott 2023-04-04 09:57:46 -04:00 committed by Siddhesh Poyarekar
parent 0d21b3783f
commit b11db301e1
2 changed files with 53 additions and 0 deletions
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2
stdlib/Makefile
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@ -198,6 +198,7 @@ tests := \
tst-cxa_atexit \
tst-environ \
tst-getrandom \
tst-labs \
tst-limits \
tst-makecontext \
tst-makecontext-align \
@ -289,6 +290,7 @@ LDFLAGS-test-dlclose-exit-race = $(LDFLAGS-rdynamic)
LDLIBS-test-dlclose-exit-race-helper.so = $(libsupport) $(shared-thread-library)
CFLAGS-tst-abs.c += -fno-builtin
CFLAGS-tst-labs.c += -fno-builtin
ifeq ($(have-cxx-thread_local),yes)
CFLAGS-tst-quick_exit.o = -std=c++11

51
stdlib/tst-labs.c Normal file
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@ -0,0 +1,51 @@
/* Basic tests for labs.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <limits.h>
#include <stdlib.h>
#include <support/check.h>
#define LARGE_PRIME 49999
static int do_test (void)
{
long i;
TEST_COMPARE(labs(LONG_MAX), LONG_MAX);
TEST_COMPARE(labs(LONG_MIN + 1), LONG_MAX);
TEST_COMPARE(labs(-1), 1);
TEST_COMPARE(labs(0), 0);
TEST_COMPARE(labs(1), 1);
for (i = LONG_MIN + 1; i < LONG_MIN + INT_MAX; i += LARGE_PRIME)
TEST_COMPARE(labs(i), -i);
for (i = LONG_MAX - INT_MAX; i < LONG_MAX - LARGE_PRIME; i += LARGE_PRIME)
TEST_COMPARE(labs(i), i);
for (i = INT_MIN + 1; i < 0; i += LARGE_PRIME)
TEST_COMPARE(labs(i), -i);
for (i = 0; i < INT_MAX; i += LARGE_PRIME)
TEST_COMPARE(labs(i), i);
return EXIT_SUCCESS;
}
#include <support/test-driver.c>