Add test for _dbus_string_skip_blank()

[smcv: Fix a memory leak]

Reproduces: https://gitlab.freedesktop.org/dbus/dbus/-/issues/421

test/CMakeLists.txt

@@ -78,6 +78,7 @@ add_helper_executable(manual-dir-iter ${manual-dir-iter_SOURCES} ${DBUS_INTERNAL
 add_helper_executable(test-service ${test-service_SOURCES} dbus-testutils)
 add_helper_executable(test-names ${test-names_SOURCES} dbus-testutils)
 add_test_executable(test-shell ${test-shell_SOURCES} ${DBUS_INTERNAL_LIBRARIES})
+add_test_executable(test-string internals/strings.c dbus-testutils)
 add_test_executable(test-printf internals/printf.c dbus-testutils)
 add_helper_executable(test-privserver test-privserver.c dbus-testutils)
 add_helper_executable(test-shell-service ${test-shell-service_SOURCES} dbus-testutils)

test/Makefile.am

@@ -90,6 +90,7 @@ uninstallable_test_programs += \
 	test-bus-dispatch-sha1 \
 	test-marshal-recursive \
 	test-message-internals \
+	test-strings \
 	$(NULL)
 
 if ENABLE_TRADITIONAL_ACTIVATION
@@ -137,6 +138,8 @@ test_privserver_LDADD = libdbus-testutils.la
 test_shell_service_LDADD = libdbus-testutils.la
 test_shell_SOURCES = shell-test.c
 test_shell_LDADD = libdbus-testutils.la
+test_strings_SOURCES = internals/strings.c
+test_strings_LDADD = libdbus-testutils.la
 
 if ENABLE_TRADITIONAL_ACTIVATION
 test_spawn_SOURCES = spawn-test.c

test/internals/strings.c

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023 Ralf Habacker
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <config.h>
+
+#include "dbus/dbus-string.h"
+#include "dbus/dbus-test.h"
+#include "dbus/dbus-test-tap.h"
+#include "test/test-utils.h"
+
+static dbus_bool_t
+_dbus_string_skip_blank_test (const char *test_data_dir _DBUS_GNUC_UNUSED)
+{
+  int end;
+  DBusString s = _DBUS_STRING_INIT_INVALID;
+  const char *p = " \rT\r\n";
+
+  _dbus_string_init (&s);
+  if (!_dbus_string_append (&s, p))
+    {
+      _dbus_string_free (&s);
+      return FALSE;
+    }
+
+  _dbus_string_skip_blank (&s, 0, &end);
+  _dbus_string_free (&s);
+  return TRUE;
+}
+
+static const DBusTestCase test[] =
+{
+  { "skip_blank", _dbus_string_skip_blank_test },
+};
+
+
+int
+main (int    argc,
+      char **argv)
+{
+  return _dbus_test_main (argc, argv, sizeof(test) / sizeof (DBusTestCase), test,
+                          DBUS_TEST_FLAGS_CHECK_MEMORY_LEAKS,
+                          NULL, NULL);
+}

test/meson.build

@@ -397,6 +397,11 @@ tests += [
         'srcs': [ 'shell-test.c' ],
         'link': [ libdbus_testutils, ],
     },
+    {
+        'name': 'strings',
+        'srcs': [ 'internals/strings.c' ],
+        'link': [ libdbus_testutils, ],
+    },
     {
         'name': 'printf',
         'srcs': [ 'internals/printf.c' ],