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Index: head/lib/libc/tests/stdlib/Makefile
===================================================================
--- head/lib/libc/tests/stdlib/Makefile
+++ head/lib/libc/tests/stdlib/Makefile
@@ -6,6 +6,7 @@
ATF_TESTS_C+= heapsort_test
ATF_TESTS_C+= mergesort_test
ATF_TESTS_C+= qsort_test
+ATF_TESTS_C+= qsort_r_test
ATF_TESTS_C+= qsort_s_test
ATF_TESTS_C+= set_constraint_handler_s_test
ATF_TESTS_C+= strfmon_test
Index: head/lib/libc/tests/stdlib/qsort_r_test.c
===================================================================
--- head/lib/libc/tests/stdlib/qsort_r_test.c
+++ head/lib/libc/tests/stdlib/qsort_r_test.c
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (C) 2020 Edward Tomasz Napierala <trasz@FreeBSD.org>
+ * Copyright (C) 2004 Maxim Sobolev <sobomax@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Test for qsort_r(3) routine.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "test-sort.h"
+
+#define THUNK 42
+
+static int
+sorthelp_r(void *thunk, const void *a, const void *b)
+{
+ const int *oa, *ob;
+
+ ATF_REQUIRE_EQ(*(int *)thunk, THUNK);
+
+ oa = a;
+ ob = b;
+ /* Don't use "return *oa - *ob" since it's easy to cause overflow! */
+ if (*oa > *ob)
+ return (1);
+ if (*oa < *ob)
+ return (-1);
+ return (0);
+}
+
+ATF_TC_WITHOUT_HEAD(qsort_r_test);
+ATF_TC_BODY(qsort_r_test, tc)
+{
+ int testvector[IVEC_LEN];
+ int sresvector[IVEC_LEN];
+ int i, j;
+ int thunk = THUNK;
+
+ for (j = 2; j < IVEC_LEN; j++) {
+ /* Populate test vectors */
+ for (i = 0; i < j; i++)
+ testvector[i] = sresvector[i] = initvector[i];
+
+ /* Sort using qsort_r(3) */
+ qsort_r(testvector, j, sizeof(testvector[0]), &thunk,
+ sorthelp_r);
+ /* Sort using reference slow sorting routine */
+ ssort(sresvector, j);
+
+ /* Compare results */
+ for (i = 0; i < j; i++)
+ ATF_CHECK_MSG(testvector[i] == sresvector[i],
+ "item at index %d didn't match: %d != %d",
+ i, testvector[i], sresvector[i]);
+ }
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+ ATF_TP_ADD_TC(tp, qsort_r_test);
+
+ return (atf_no_error());
+}

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