Replace all use of POSIX unlink

Use `<filesystem>` instead of `unlink` and remove `unlink` portability
wrapper.

Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

source/lib/sysdep/filesystem.h

@@ -67,8 +67,6 @@ extern int wclose(int fd);
 // this function called.
 int wtruncate(const OsPath& pathname, off_t length);
 
-int wunlink(const OsPath& pathname);
-
 int wrmdir(const OsPath& path);
 
 

source/lib/sysdep/os/unix/ufilesystem.cpp

@@ -93,17 +93,11 @@ int wclose(int fd)
 	return close(fd);
 }
 
-
 int wtruncate(const OsPath& pathname, off_t length)
 {
 	return truncate(OsString(pathname).c_str(), length);
 }
 
-int wunlink(const OsPath& pathname)
-{
-	return unlink(OsString(pathname).c_str());
-}
-
 int wrmdir(const OsPath& path)
 {
 	return rmdir(OsString(path).c_str());

source/lib/sysdep/os/win/wposix/wfilesystem.cpp

@@ -146,12 +146,6 @@ int wtruncate(const OsPath& pathname, off_t length)
 }
 
 
-int wunlink(const OsPath& pathname)
-{
-	return _wunlink(OsString(pathname).c_str());
-}
-
-
 int wrmdir(const OsPath& path)
 {
 	return _wrmdir(OsString(path).c_str());

source/ps/ModIo.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -49,6 +49,7 @@
 #include <boost/algorithm/string/split.hpp>
 #include <cstdio>
 #include <cstring>
+#include <filesystem>
 #include <fmt/printf.h>
 #include <initializer_list>
 #include <js/Array.h>
@@ -56,6 +57,7 @@
 #include <js/RootingAPI.h>
 #include <js/TypeDecls.h>
 #include <js/Value.h>
+#include <system_error>
 
 class ScriptInterface;
 
@@ -545,7 +547,9 @@ bool ModIo::ParseMods(const ScriptInterface& scriptInterface, std::string& err)
 
 void ModIo::DeleteDownloadedFile()
 {
-	if (wunlink(m_DownloadFilePath) != 0)
+	std::error_code ec{};
+	std::filesystem::remove(m_DownloadFilePath.string(), ec);
+	if (ec)
 		LOGERROR("Failed to delete temporary file.");
 	m_DownloadFilePath = OsPath();
 }

source/ps/SavedGame.cpp

@@ -51,10 +51,12 @@
 
 #include <cstdint>
 #include <ctime>
+#include <filesystem>
 #include <js/RootingAPI.h>
 #include <js/TypeDecls.h>
 #include <memory>
 #include <sstream>
+#include <system_error>
 #include <utility>
 
 class ScriptInterface;
@@ -343,7 +345,9 @@ bool SavedGames::DeleteSavedGame(const std::wstring& name)
 		return false; // Error
 
 	// Delete actual file
-	if (wunlink(realpath) != 0)
+	std::error_code ec{};
+	std::filesystem::remove(realpath.string(), ec);
+	if (ec)
 		return false; // Error
 
 	// Successfully deleted file

source/ps/VisualReplay.cpp

@@ -42,6 +42,7 @@
 
 #include <SDL_events.h>
 #include <SDL_quit.h>
+#include <filesystem>
 #include <fstream>
 #include <iterator>
 #include <js/Array.h>
@@ -50,6 +51,7 @@
 #include <js/Value.h>
 #include <map>
 #include <string>
+#include <system_error>
 #include <tuple>
 #include <utility>
 #include <vector>
@@ -110,7 +112,8 @@ bool VisualReplay::ReadCacheFile(const ScriptInterface& scriptInterface, JS::Mut
 	}
 
 	LOGWARNING("The replay cache file is corrupted, it will be deleted");
-	wunlink(GetCacheFilePath());
+	std::error_code ec{};
+	std::filesystem::remove(GetCacheFilePath().string(), ec);
 	return false;
 }
 
@@ -123,7 +126,8 @@ void VisualReplay::StoreCacheFile(const ScriptInterface& scriptInterface, JS::Ha
 	cacheStream << Script::StringifyJSON(rq, &replaysRooted);
 	cacheStream.close();
 
-	wunlink(GetCacheFilePath());
+	std::error_code ec{};
+	std::filesystem::remove(GetCacheFilePath().string(), ec);
 	if (RenameFile(GetTempCacheFilePath(), GetCacheFilePath()))
 		LOGERROR("Could not store the replay cache");
 }

source/ps/scripting/JSInterface_VFS.cpp

@@ -43,6 +43,7 @@
 #include <array>
 #include <cstddef>
 #include <cstdint>
+#include <filesystem>
 #include <fmt/format.h>
 #include <js/Array.h>
 #include <js/PropertyAndElement.h>
@@ -53,6 +54,7 @@
 #include <stdexcept>
 #include <string>
 #include <string_view>
+#include <system_error>
 
 class ScriptInterface;
 
@@ -288,11 +290,15 @@ bool DeleteCampaignSave(const CStrW& filePath)
 	OsPath realPath;
 	if (filePath.Left(16) != L"saves/campaigns/" || filePath.Right(12) != L".0adcampaign")
 		return false;
-
-	return VfsFileExists(filePath) &&
-		g_VFS->GetRealPath(filePath, realPath) == INFO::OK &&
-		g_VFS->RemoveFile(filePath) == INFO::OK &&
-		wunlink(realPath) == 0;
+	if (!VfsFileExists(filePath))
+		return false;
+	if (g_VFS->GetRealPath(filePath, realPath) != INFO::OK)
+		return false;
+	if (g_VFS->RemoveFile(filePath) != INFO::OK)
+		return false;
+	std::error_code ec;
+	std::filesystem::remove(realPath.string(), ec);
+	return !ec;
 }
 
 void RegisterScriptFunctions_ReadWriteAnywhere(const ScriptRequest& rq,

source/simulation2/Simulation2.cpp

@@ -60,6 +60,7 @@
 #include <algorithm>
 #include <cstddef>
 #include <cstdint>
+#include <filesystem>
 #include <fstream>
 #include <functional>
 #include <iomanip>
@@ -70,6 +71,7 @@
 #include <optional>
 #include <set>
 #include <sstream>
+#include <system_error>
 
 class CSimulation2Impl
 {
@@ -321,19 +323,26 @@ void CSimulation2Impl::ReportSerializationFailure(
 	const OsPath path = createDateIndexSubdirectory(psLogDir() / "serializationtest");
 	debug_printf("Writing serializationtest-data to %s\n", path.string8().c_str());
 
-	// Clean up obsolete files from previous runs
-	wunlink(path / "hash.before.a");
-	wunlink(path / "hash.before.b");
-	wunlink(path / "debug.before.a");
-	wunlink(path / "debug.before.b");
-	wunlink(path / "state.before.a");
-	wunlink(path / "state.before.b");
-	wunlink(path / "hash.after.a");
-	wunlink(path / "hash.after.b");
-	wunlink(path / "debug.after.a");
-	wunlink(path / "debug.after.b");
-	wunlink(path / "state.after.a");
-	wunlink(path / "state.after.b");
+	// Try to clean up obsolete files from previous runs.
+	constexpr auto namesToRemove{std::to_array<std::string_view>({
+		"hash.before.a",
+		"hash.before.b",
+		"debug.before.a",
+		"debug.before.b",
+		"state.before.a",
+		"state.before.b",
+		"hash.after.a",
+		"hash.after.b",
+		"debug.after.a",
+		"debug.after.b",
+		"state.after.a",
+		"state.after.b",
+	})};
+
+	const std::filesystem::path fspath{path.string()};
+	std::error_code ec{};
+	for (const std::string_view nameToRemove : namesToRemove)
+		std::filesystem::remove(fspath / nameToRemove, ec);
 
 	if (primaryStateBefore)
 		DumpSerializationTestState(*primaryStateBefore, path, L"before.a");