Merge pull request #55 from Reim-developer/dev

Implement new helper function `raw_cache_dir` & test this function in FFI test & backend test

Author: Reim-developer

src/back_end/src/utils/fs_utils.rs

@@ -71,11 +71,17 @@ pub extern "C" fn raw_config_dir() -> *mut c_char {
         .and_then(|path| path.into_os_string().into_string().ok())
         .and_then(|string| CString::new(string).ok());
 
-    result.map_or(null_mut(), |c_str| {
-        CString::new(c_str)
-            .map(CString::into_raw)
-            .unwrap_or(null_mut())
-    })
+    result.map_or(null_mut(), CString::into_raw)
+}
+
+#[must_use]
+#[unsafe(no_mangle)]
+pub extern "C" fn raw_cache_dir() -> *mut c_char {
+    let result = dirs::cache_dir()
+        .and_then(|path| path.into_os_string().into_string().ok())
+        .and_then(|string| CString::new(string).ok());
+
+    result.map_or(null_mut(), CString::into_raw)
 }
 
 #[must_use]

src/back_end/tests/fs_utils.rs

@@ -0,0 +1,13 @@
+#[test]
+fn test_raw_cache_dir() {
+    use back_end::utils::fs_utils::raw_cache_dir;
+    use std::ffi::CStr;
+
+    unsafe {
+        let result = raw_cache_dir();
+        let result_str = CStr::from_ptr(result).to_string_lossy();
+
+        assert!(!result.is_null());
+        assert!(!result_str.is_empty());
+    }
+}

tests-ffi/fs.cxx

@@ -1,13 +1,33 @@
-
 #include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <span>
+#include <string>
+
+using std::span;
+using std::string;
+
 extern "C" bool raw_is_path_exists(const char *path);
+extern "C" char *raw_cache_dir();
+extern "C" void raw_free_c_str(char *c_str);
 
-int main() {
-	const char *valid_path = "../tests-ffi";
+int main(int argc, char *argv[]) {
+	const auto this_file_span = span(argv, size_t(argc));
+
+	if (this_file_span.empty()) {
+		abort();
+	}
+
+	const char *file_name = this_file_span[0];
 	const char *wrong_path = "../abcxyzw1133";
 
-	assert(raw_is_path_exists(valid_path));
+	char *raw_cache_dir_value = raw_cache_dir();
+	const string cache_dir = string(raw_cache_dir_value);
+	raw_free_c_str(raw_cache_dir_value);
+
+	assert(raw_is_path_exists(file_name));
 	assert(!raw_is_path_exists(wrong_path));
+	assert(!cache_dir.empty());
 
 	return 0;
 }

tests-ffi/tests.sh

@@ -47,7 +47,7 @@ function run_ffi_test() {
 		build_output=$(basename "$file" ".cxx")
 		file_name=$(basename "$file")
 
-		$clang_cxx "$file" -l"$sqlite_lib" "$static_lib_path" -o "$build_dir/$build_output"
+		$clang_cxx "$file" -l"$sqlite_lib" "$static_lib_path" -o "$build_dir/$build_output" -std=c++20
 		echo
 		echo -e -n "\e[0;32m[+] Test for $file_name:\e[0;37m"