refactor: refactor old IOHelper.

- move pointer left padding macro into single header file.
- move utf8 fopen into single header but not finished.
- add testbench for pointer left padding macro.
- add system pointer size detector according to new migrated features requested.

src/yycc/macro/os_detector.hpp

@@ -1,7 +1,7 @@
 #pragma once
 
 // Check OS macro
-#if (defined(YYCC_OS_WINDOWS) + defined(YYCC_OS_LINUX)) != 1
+#if (defined(YYCC_OS_WINDOWS) + defined(YYCC_OS_LINUX) + defined(YYCC_OS_MACOS)) != 1
 #error "Current operating system is not supported!"
 #endif
 
@@ -11,6 +11,7 @@ namespace yycc::macro::os {
     enum class OsKind {
         Windows, ///< Microsoft Windows
         Linux,   ///< GNU/Linux
+        MacOs,   ///< Apple macOS
     };
 
     /**
@@ -20,8 +21,10 @@ namespace yycc::macro::os {
     inline constexpr OsKind get_os() {
 #if defined(YYCC_OS_WINDOWS)
         return OsKind::Windows;
-#else
+#elif defined(YYCC_OS_LINUX)
         return OsKind::Linux;
+#else
+        return OsKind::MacOs;
 #endif
     }
 

src/yycc/macro/ptr_size_detector.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+// Check pointer size macro
+#if (defined(YYCC_PTRSIZE_32) + defined(YYCC_PTRSIZE_64)) != 1
+#error "Current environment used pointer size is not supported!"
+#endif