From ef85eec1781d9fc311905de03cc0a63d9363a550 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Tue, 4 Mar 2025 18:12:21 +0300
Subject: [PATCH] Use wide strings for io::file_stream on Windows

---
 libs/io/source/file_stream.cpp | 79 ++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 22 deletions(-)

diff --git a/libs/io/source/file_stream.cpp b/libs/io/source/file_stream.cpp
index 7c1cc481..089b9c71 100644
--- a/libs/io/source/file_stream.cpp
+++ b/libs/io/source/file_stream.cpp
@@ -1,27 +1,72 @@
 #include <psemek/io/file_stream.hpp>
 #include <psemek/util/system_error.hpp>
+#include <psemek/util/enum.hpp>
 
 #include <cstring>
-#include <codecvt>
 
 namespace psemek::io
 {
 
-	static void throw_fopen [[noreturn]] (std::filesystem::path const & path)
+	namespace
 	{
-		throw util::system_error(std::error_code{errno, std::system_category()}, "Failed to open " + path.string());
-	}
 
-	static FILE * safe_fopen(std::filesystem::path const & path, const char * mode)
-	{
-		std::string path_str = path.string();
-		auto f = std::fopen(path_str.c_str(), mode);
-		if (!f) throw_fopen(path);
-		return f;
+		void throw_fopen [[noreturn]] (std::filesystem::path const & path)
+		{
+			throw util::system_error(std::error_code{errno, std::system_category()}, "Failed to open " + path.string());
+		}
+
+#ifdef __WIN32__
+		wchar_t const * fopen_read_mode()
+		{
+			return L"rb";
+		}
+
+		wchar_t const * fopen_write_mode(unsigned flags)
+		{
+			switch (flags)
+			{
+			case 0: return L"wb";
+			case file_ostream::append: return L"ab";
+			}
+
+			throw util::exception("Unknown file_ostream open flags");
+		}
+
+		FILE * safe_fopen(std::filesystem::path const & path, wchar_t const * mode)
+		{
+			auto f = _wfopen(path.c_str(), mode);
+			if (!f) throw_fopen(path);
+			return f;
+		}
+#else
+		char const * fopen_read_mode()
+		{
+			return "rb";
+		}
+
+		char const * fopen_write_mode(unsigned flags)
+		{
+			switch (flags)
+			{
+			case 0: return "wb";
+			case file_ostream::append: return "ab";
+			}
+
+			throw util::exception("Unknown file_ostream open flags");
+		}
+
+		FILE * safe_fopen(std::filesystem::path const & path, char const * mode)
+		{
+			auto f = std::fopen(path.c_str(), mode);
+			if (!f) throw_fopen(path);
+			return f;
+		}
+#endif
+
 	}
 
 	file_istream::file_istream(std::filesystem::path const & path)
-		: file_{safe_fopen(path.c_str(), "rb")}
+		: file_{safe_fopen(path, fopen_read_mode())}
 	{}
 
 	void file_istream::reset()
@@ -43,18 +88,8 @@ namespace psemek::io
 		return std::feof(file_) != 0;
 	}
 
-	static char const * fopen_write_mode(unsigned flags)
-	{
-		switch (flags)
-		{
-		case 0: return "wb";
-		case file_ostream::append: return "ab";
-		default: throw util::exception("Unknown file_ostream open flags");
-		}
-	}
-
 	file_ostream::file_ostream(std::filesystem::path const & path, unsigned flags)
-		: file_{safe_fopen(path.c_str(), fopen_write_mode(flags))}
+		: file_{safe_fopen(path, fopen_write_mode(flags))}
 	{}
 
 	void file_ostream::reset()