mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
1bb28b7b4f
Adjust the testing approach to start from scenarios with only 2 elements, as insertion sort no longer handles such cases. Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* Test the heapsort implementation behind qsort.
|
|
Copyright (C) 2023-2024 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "qsort.c"
|
|
|
|
#include <stdio.h>
|
|
#include <support/check.h>
|
|
#include <support/support.h>
|
|
|
|
static int
|
|
cmp (const void *a1, const void *b1, void *closure)
|
|
{
|
|
const signed char *a = a1;
|
|
const signed char *b = b1;
|
|
return *a - *b;
|
|
}
|
|
|
|
static void
|
|
check_one_sort (signed char *array, int length)
|
|
{
|
|
signed char *copy = xmalloc (length);
|
|
memcpy (copy, array, length);
|
|
heapsort_r (copy, length - 1, 1, cmp, NULL);
|
|
|
|
/* Verify that the result is sorted. */
|
|
for (int i = 1; i < length; ++i)
|
|
if (copy[i] < copy[i - 1])
|
|
{
|
|
support_record_failure ();
|
|
printf ("error: sorting failure for length %d at offset %d\n",
|
|
length, i - 1);
|
|
printf ("input:");
|
|
for (int i = 0; i < length; ++i)
|
|
printf (" %d", array[i]);
|
|
printf ("\noutput:");
|
|
for (int i = 0; i < length; ++i)
|
|
printf (" %d", copy[i]);
|
|
putchar ('\n');
|
|
break;
|
|
}
|
|
|
|
/* Verify that no elements went away or were added. */
|
|
{
|
|
int expected_counts[256];
|
|
for (int i = 0; i < length; ++i)
|
|
++expected_counts[array[i] & 0xff];
|
|
int actual_counts[256];
|
|
for (int i = 0; i < length; ++i)
|
|
++actual_counts[copy[i] & 0xff];
|
|
for (int i = 0; i < 256; ++i)
|
|
TEST_COMPARE (expected_counts[i], expected_counts[i]);
|
|
}
|
|
|
|
free (copy);
|
|
}
|
|
|
|
/* Enumerate all possible combinations of LENGTH elements. */
|
|
static void
|
|
check_combinations (int length, signed char *start, int offset)
|
|
{
|
|
if (offset == length)
|
|
check_one_sort (start, length);
|
|
else
|
|
for (int i = 0; i < length; ++i)
|
|
{
|
|
start[offset] = i;
|
|
check_combinations(length, start, offset + 1);
|
|
}
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
/* A random permutation of 20 values. */
|
|
check_one_sort ((signed char[20]) {5, 12, 16, 10, 14, 11, 9, 13, 8, 15,
|
|
0, 17, 3, 7, 1, 18, 2, 19, 4, 6}, 20);
|
|
|
|
|
|
/* A permutation that appeared during adversarial testing for the
|
|
quicksort pass. */
|
|
check_one_sort ((signed char[16]) {15, 3, 4, 2, 1, 0, 8, 7, 6, 5, 14,
|
|
13, 12, 11, 10, 9}, 16);
|
|
|
|
for (int i = 2; i <= 8; ++i)
|
|
{
|
|
signed char *buf = xmalloc (i);
|
|
check_combinations (i, buf, 0);
|
|
free (buf);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|