2 files changed, 177 insertions, 0 deletions

diff --git a/lib/libc/tests/stdlib/Makefile b/lib/libc/tests/stdlib/Makefile
index bd85efcb1b95..ffba83443a9e 100644
--- a/lib/libc/tests/stdlib/Makefile
+++ b/lib/libc/tests/stdlib/Makefile
@@ -2,6 +2,7 @@
 
 .include <src.opts.mk>
 
+ATF_TESTS_C+=		clearenv_test
 ATF_TESTS_C+=		dynthr_test
 ATF_TESTS_C+=		heapsort_test
 ATF_TESTS_C+=		mergesort_test
diff --git a/lib/libc/tests/stdlib/clearenv_test.c b/lib/libc/tests/stdlib/clearenv_test.c
new file mode 100644
index 000000000000..0c705bfece1e
--- /dev/null
+++ b/lib/libc/tests/stdlib/clearenv_test.c
@@ -0,0 +1,176 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 2021 Mariusz Zaborski <oshogbo@FreeBSD.org>
+ *
+ * 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 clearenv(3) routine.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <atf-c.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define TEST_VARIABLE		"TEST_VAR"
+#define TEST_SYSTEM_VARIABLE	"PWD"
+
+extern char **environ;
+
+void
+create_multiple_variables(int num)
+{
+	char name[64];
+	char value[64];
+	int i;
+
+	for (i = 0; i < num; i++) {
+		snprintf(name, sizeof(name), "%s_%d", TEST_VARIABLE, i);
+		snprintf(value, sizeof(value), "%d", i);
+		ATF_CHECK(getenv(name) == NULL);
+		ATF_CHECK(setenv(name, value, 0) != -1);
+		ATF_CHECK_STREQ(getenv(name), value);
+	}
+}
+
+void
+check_if_nulled_variables(int num)
+{
+	char name[64];
+	int i;
+
+	for (i = 0; i < num; i++) {
+		snprintf(name, sizeof(name), "%s_%d", TEST_VARIABLE, i);
+		ATF_CHECK(getenv(name) == NULL);
+	}
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__single_var_test);
+ATF_TC_BODY(clearenv__single_var_test, tc)
+{
+
+	ATF_CHECK(setenv(TEST_VARIABLE, "true", 0) != -1);
+	ATF_CHECK_STREQ(getenv(TEST_VARIABLE), "true");
+	ATF_CHECK(clearenv() == 0);
+	ATF_CHECK(getenv(TEST_VARIABLE) == NULL);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__multiple_vars_test);
+ATF_TC_BODY(clearenv__multiple_vars_test, tc)
+{
+
+	create_multiple_variables(10);
+	ATF_CHECK(clearenv() == 0);
+	check_if_nulled_variables(10);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__recreated_vars_test);
+ATF_TC_BODY(clearenv__recreated_vars_test, tc)
+{
+
+	create_multiple_variables(10);
+	ATF_CHECK(clearenv() == 0);
+	check_if_nulled_variables(10);
+	create_multiple_variables(10);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__system_var_test);
+ATF_TC_BODY(clearenv__system_var_test, tc)
+{
+
+	ATF_CHECK(getenv(TEST_SYSTEM_VARIABLE) != NULL);
+	ATF_CHECK(clearenv() == 0);
+	ATF_CHECK(getenv(TEST_SYSTEM_VARIABLE) == NULL);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__recreated_system_var_test);
+ATF_TC_BODY(clearenv__recreated_system_var_test, tc)
+{
+
+	ATF_CHECK(getenv(TEST_SYSTEM_VARIABLE) != NULL);
+	ATF_CHECK(clearenv() == 0);
+	ATF_CHECK(getenv(TEST_SYSTEM_VARIABLE) == NULL);
+	ATF_CHECK(setenv(TEST_SYSTEM_VARIABLE, "test", 0) != -1);
+	ATF_CHECK_STREQ(getenv(TEST_SYSTEM_VARIABLE), "test");
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__double_clear_vars);
+ATF_TC_BODY(clearenv__double_clear_vars, tc)
+{
+
+	create_multiple_variables(10);
+	ATF_CHECK(clearenv() == 0);
+	check_if_nulled_variables(10);
+	ATF_CHECK(clearenv() == 0);
+	check_if_nulled_variables(10);
+	create_multiple_variables(10);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__environ_null);
+ATF_TC_BODY(clearenv__environ_null, tc)
+{
+
+	ATF_CHECK(clearenv() == 0);
+	ATF_CHECK(environ == NULL);
+}
+
+ATF_TC_WITHOUT_HEAD(clearenv__putenv_vars);
+ATF_TC_BODY(clearenv__putenv_vars, tc)
+{
+	char buf[64], ref[64];
+
+	snprintf(buf, sizeof(buf), "%s=1", TEST_VARIABLE);
+	strcpy(ref, buf);
+
+	ATF_CHECK(getenv(TEST_VARIABLE) == NULL);
+	ATF_CHECK(putenv(buf) != -1);
+	ATF_CHECK(strcmp(getenv(TEST_VARIABLE), "1") == 0);
+
+	ATF_CHECK(clearenv() == 0);
+
+	ATF_CHECK(getenv(TEST_VARIABLE) == NULL);
+	ATF_CHECK(strcmp(buf, ref) == 0);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+	ATF_TP_ADD_TC(tp, clearenv__single_var_test);
+	ATF_TP_ADD_TC(tp, clearenv__multiple_vars_test);
+	ATF_TP_ADD_TC(tp, clearenv__recreated_vars_test);
+
+	ATF_TP_ADD_TC(tp, clearenv__system_var_test);
+	ATF_TP_ADD_TC(tp, clearenv__recreated_system_var_test);
+
+	ATF_TP_ADD_TC(tp, clearenv__double_clear_vars);
+	ATF_TP_ADD_TC(tp, clearenv__environ_null);
+
+	ATF_TP_ADD_TC(tp, clearenv__putenv_vars);
+
+	return (atf_no_error());
+}