Add unit test for read_common_sizet function

tests/API/probes/CMakeLists.txt

@@ -38,3 +38,12 @@ target_include_directories(oval_fts_list PUBLIC
 )
 target_link_libraries(oval_fts_list openscap)
 add_oscap_test("fts.sh")
+
+add_oscap_test_executable(test_memusage
+	"test_memusage.c"
+	"${CMAKE_SOURCE_DIR}/src/common/bfind.c"
+)
+target_include_directories(test_memusage PUBLIC
+	"${CMAKE_SOURCE_DIR}/src/common"
+)
+add_oscap_test("test_memusage.sh")

tests/API/probes/test_memusage.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2022 Red Hat Inc., Durham, North Carolina.
+ * All Rights Reserved.
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors:
+ *      "Jan Černý" <jcerny@redhat.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include "memusage.h"
+#include "memusage.c"
+#define OS_LINUX
+
+static int test_basic()
+{
+	size_t size;
+	char *strval = strdup("17 MB");
+	read_common_sizet(&size, strval);
+	free(strval);
+	return (size == 17);
+}
+
+static int test_errno()
+{
+	size_t size;
+	char *strval = strdup("17 MB");
+
+	/* Test that setting errno outside of the read_common_sizet function
+	 * doesn't influence the function and doesn't make the function fail.
+	 */
+	errno = EINVAL;
+
+	int ret = read_common_sizet(&size, strval);
+	free(strval);
+	return (ret != -1);
+}
+
+int main(int argc, char *argv[])
+{
+	if (!test_basic()) {
+		fprintf(stderr, "test_basic has failed\n");
+		return 1;
+	}
+	if (!test_errno()) {
+		fprintf(stderr, "test_errno has failed\n");
+		return 1;
+	}
+	return 0;
+}

tests/API/probes/test_memusage.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+. $builddir/tests/test_common.sh
+
+if [ -n "${CUSTOM_OSCAP+x}" ] ; then
+    exit 255
+fi
+
+./test_memusage