Bugfix/validate-user-provided-file-object-paths (#1197)

* Fixed BACnet file object path name unintended path traversals by optionally restricting path name content with BACNET_FILE_PATH_RESTRICTED define.

* Added POSIX file path name checking for AtomicReadFile and AtomicWriteFile example applications. Prohibits use of relative and absolute file paths when BACNET_FILE_PATH_RESTRICTED is non-zero.

test/bacnet/basic/sys/filename/CMakeLists.txt

@@ -34,6 +34,7 @@ add_executable(${PROJECT_NAME}
     # File(s) under test
     ${SRC_DIR}/bacnet/basic/sys/filename.c
     # Support files and stubs (pathname alphabetical)
+    ${SRC_DIR}/bacnet/basic/sys/debug.c
     # Test and test library files
     ./src/main.c
     ${ZTST_DIR}/ztest_mock.c