Utility functions for xrdp regions and tests

- xrdp_region_get_bounds
- xrdp_region_not_empty
- Incorporate example usage of cmocka
- Cmocka doesn't work with C++

tests/xrdp/Makefile.am

@@ -27,11 +27,16 @@ test_xrdp_SOURCES = \
     test_xrdp.h \
     test_xrdp_main.c \
     test_xrdp_egfx.c \
+    test_xrdp_region.c \
     test_bitmap_load.c
 
 test_xrdp_CFLAGS = \
     -D IMAGEDIR=\"$(srcdir)\" \
-    @CHECK_CFLAGS@
+    @CHECK_CFLAGS@ \
+    @CMOCKA_CFLAGS@
+
+test_xrdp_LDFLAGS = -Wl,--wrap=pixman_region_extents, \
+    -Wl,--wrap=pixman_region_not_empty
 
 test_xrdp_LDADD = \
     $(top_builddir)/xrdp/xrdp_bitmap_load.o \
@@ -58,4 +63,5 @@ test_xrdp_LDADD = \
     $(top_builddir)/xrdp/xrdp_main_utils.o \
     $(PIXMAN_LIBS) \
     $(IMLIB2_LIBS) \
-    @CHECK_LIBS@
+    @CHECK_LIBS@ \
+    @CMOCKA_LIBS@

tests/xrdp/test_xrdp.h

@@ -5,5 +5,6 @@
 
 Suite *make_suite_test_bitmap_load(void);
 Suite *make_suite_egfx_base_functions(void);
+Suite *make_suite_region(void);
 
 #endif /* TEST_XRDP_H */

tests/xrdp/test_xrdp_main.c

@@ -56,6 +56,7 @@ int main (void)
 
     sr = srunner_create (make_suite_test_bitmap_load());
     srunner_add_suite(sr, make_suite_egfx_base_functions());
+    srunner_add_suite(sr, make_suite_region());
 
     srunner_set_tap(sr, "-");
     srunner_run_all (sr, CK_ENV);

tests/xrdp/test_xrdp_region.c

@@ -0,0 +1,164 @@
+/**
+ * xrdp: A Remote Desktop Protocol server.
+ *
+ * Copyright (C) Jay Sorg, Christopher Pitstick 2004-2023
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Test driver for XRDP routines
+ *
+ * If you want to run this driver under valgrind to check for memory leaks,
+ * use the following command line:-
+ *
+ * CK_FORK=no valgrind --leak-check=full --show-leak-kinds=all \
+ *     .libs/test_xrdp
+ *
+ * without the 'CK_FORK=no', memory still allocated by the test driver will
+ * be logged
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config_ac.h"
+#endif
+
+#include "log.h"
+#include "os_calls.h"
+#include <stdlib.h>
+
+#if defined(XRDP_PIXMAN)
+#include <pixman.h>
+#else
+#include "pixman-region.h"
+#endif
+
+#include "test_xrdp.h"
+#include "xrdp.h"
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#ifdef __cplusplus
+#error "cmocka is not supported with C++"
+#else
+#include <cmocka.h>
+#endif
+
+#define UNUSED(x) (void)(x)
+
+// Mock functions
+static pixman_box16_t test_box =
+{
+    0, 0, 100, 100
+};
+
+pixman_box16_t *__wrap_pixman_region_extents(pixman_region16_t *region)
+{
+    check_expected_ptr(region);
+    return mock_ptr_type(pixman_box16_t *);
+}
+
+static void test_xrdp_region_get_bounds__negligent_path(void **state)
+{
+    struct xrdp_region *region = g_new0(struct xrdp_region, 1);
+    struct xrdp_rect *rect = g_new0(struct xrdp_rect, 1);
+
+    // Cmocka boilerplate
+    UNUSED(state);
+    expect_any(__wrap_pixman_region_extents, region);
+    will_return(__wrap_pixman_region_extents, NULL);
+
+    const int ret = xrdp_region_get_bounds(region, rect);
+
+    assert_int_equal(1, ret);
+
+    g_free(region);
+    g_free(rect);
+}
+
+static void test_xrdp_region_get_bounds__happy_path(void **state)
+{
+    struct xrdp_region *region = g_new0(struct xrdp_region, 1);
+    struct xrdp_rect *rect = g_new0(struct xrdp_rect, 1);
+
+    // Cmocka boilerplate
+    UNUSED(state);
+    expect_any(__wrap_pixman_region_extents, region);
+    will_return(__wrap_pixman_region_extents, &test_box);
+
+    const int ret = xrdp_region_get_bounds(region, rect);
+
+    assert_int_equal(0, ret);
+    assert_int_equal(0, rect->top);
+    assert_int_equal(0, rect->left);
+    assert_int_equal(100, rect->bottom);
+    assert_int_equal(100, rect->right);
+
+    g_free(region);
+    g_free(rect);
+}
+
+pixman_bool_t __wrap_pixman_region_not_empty(pixman_region16_t *region)
+{
+    check_expected_ptr(region);
+    return mock_type(pixman_bool_t);
+}
+
+static void test_xrdp_region_not_empty__happy_path(void **state)
+{
+    struct xrdp_region *region = g_new0(struct xrdp_region, 1);
+
+    // Cmocka boilerplate
+    UNUSED(state);
+    expect_any(__wrap_pixman_region_not_empty, region);
+    will_return(__wrap_pixman_region_not_empty, (pixman_bool_t)0);
+
+    const int ret = xrdp_region_not_empty(region);
+
+    assert_int_equal(0, ret);
+
+    g_free(region);
+}
+
+START_TEST(execute_suite)
+{
+    const struct CMUnitTest tests[] =
+    {
+        cmocka_unit_test(test_xrdp_region_get_bounds__negligent_path),
+        cmocka_unit_test(test_xrdp_region_get_bounds__happy_path),
+        cmocka_unit_test(test_xrdp_region_not_empty__happy_path)
+    };
+
+    ck_assert_int_eq(cmocka_run_group_tests(tests, NULL, NULL), 0);
+}
+END_TEST
+
+/******************************************************************************/
+/*
+For an example of how to use cmocka, see the following:
+https://gitlab.com/cmocka/cmocka/-/blob/master/example/mock/uptime/test_uptime.c
+*/
+Suite *
+make_suite_region(void)
+{
+    Suite *s;
+    TCase *tc_region;
+
+    s = suite_create("test_xrdp_region");
+
+    tc_region = tcase_create("test_xrdp_region");
+    tcase_add_test(tc_region, execute_suite);
+
+    suite_add_tcase(s, tc_region);
+
+    return s;
+}