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

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Test minimum and maximum int values, zero, and part of the range
of int 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 09:57:45 -04:00 committed by Siddhesh Poyarekar
parent 114f1b7881
commit 0d21b3783f
2 changed files with 48 additions and 0 deletions
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3
stdlib/Makefile
View File

@ -184,6 +184,7 @@ tests := \
testmb2 \
testrand \
testsort \
tst-abs \
tst-arc4random-fork \
tst-arc4random-stats \
tst-arc4random-thread \
@ -287,6 +288,8 @@ LDLIBS-test-dlclose-exit-race = $(shared-thread-library)
LDFLAGS-test-dlclose-exit-race = $(LDFLAGS-rdynamic)
LDLIBS-test-dlclose-exit-race-helper.so = $(libsupport) $(shared-thread-library)
CFLAGS-tst-abs.c += -fno-builtin
ifeq ($(have-cxx-thread_local),yes)
CFLAGS-tst-quick_exit.o = -std=c++11
LDLIBS-tst-quick_exit = -lstdc++

45
stdlib/tst-abs.c Normal file
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@ -0,0 +1,45 @@
/* Basic tests for abs.
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)
{
int i;
TEST_COMPARE(abs(INT_MAX), INT_MAX);
TEST_COMPARE(abs(INT_MIN + 1), INT_MAX);
TEST_COMPARE(abs(-1), 1);
TEST_COMPARE(abs(0), 0);
TEST_COMPARE(abs(1), 1);
for (i = INT_MIN + 1; i < 0; i += LARGE_PRIME)
TEST_COMPARE(abs(i), -i);
for (i = 0; i < INT_MAX - LARGE_PRIME; i += LARGE_PRIME)
TEST_COMPARE(abs(i), i);
return EXIT_SUCCESS;
}
#include <support/test-driver.c>