- do not use POSIX directory functions in common code.

For Windows these need to redirect to Unicode system functions to properly handle paths not representable in 8 bit encodings.

src/common/platform/posix/cocoa/i_system.mm

@@ -171,9 +171,24 @@ unsigned int I_MakeRNGSeed()
 	return static_cast<unsigned int>(arc4random());
 }
 
+FString I_GetCWD()
+{
+	char curdir[PATH_MAX];
+	if (!getcwd(curdir, countof(curdir)))
+	{
+		return "";
+	}
+	return curdir;
+}
+
+bool I_ChDir(const char* path)
+{
+	return chdir(path) == 0;
+}
+
 void I_OpenShellFolder(const char* folder)
 {
-	char curdir[256];
+	char curdir[PATH_MAX];
 	if (!getcwd (curdir, countof(curdir)))
 	{
 		Printf ("Current path too long\n");

src/common/platform/posix/i_system.h

@@ -69,6 +69,8 @@ inline int I_GetNumaNodeCount() { return 1; }
 inline int I_GetNumaNodeThreadCount(int numaNode) { return std::max<int>(std::thread::hardware_concurrency(), 1); }
 inline void I_SetThreadNumaNode(std::thread &thread, int numaNode) { }
 
+FString I_GetCWD();
+bool I_ChDir(const char* path);
 void I_OpenShellFolder(const char*);
 
 #endif

src/common/platform/posix/sdl/i_system.cpp

@@ -410,6 +410,21 @@ FString I_GetFromClipboard (bool use_primary_selection)
 	return "";
 }
 
+FString I_GetCWD()
+{
+	char curdir[PATH_MAX];
+	if (!getcwd(curdir, countof(curdir)))
+	{
+		return "";
+	}
+	return curdir;
+}
+
+bool I_ChDir(const char* path)
+{
+	return chdir(path) == 0;
+}
+
 // Return a random seed, preferably one with lots of entropy.
 unsigned int I_MakeRNGSeed()
 {
@@ -434,7 +449,7 @@ unsigned int I_MakeRNGSeed()
 
 void I_OpenShellFolder(const char* folder)
 {
-	char curdir[256];
+	char curdir[PATH_MAX];
 	if (!getcwd (curdir, countof(curdir)))
 	{
 		Printf ("Current path too long\n");

src/common/platform/win32/i_system.cpp

@@ -961,6 +961,25 @@ void I_SetThreadNumaNode(std::thread &thread, int numaNode)
 	}
 }
 
+FString I_GetCWD()
+{
+	auto len = GetCurrentDirectoryW(0, nullptr);
+	TArray<wchar_t> curdir(len + 1, true);
+	if (!GetCurrentDirectoryW(len + 1, curdir.Data()))
+	{
+		return "";
+	}
+	FString returnv(curdir.Data());
+	FixPathSeperator(returnv);
+	return returnv;
+}
+
+bool I_ChDir(const char* path)
+{
+	return SetCurrentDirectoryW(WideString(path).c_str());
+}
+
+
 void I_OpenShellFolder(const char* infolder)
 {
 	auto len = GetCurrentDirectoryW(0, nullptr);

src/common/platform/win32/i_system.h

@@ -80,5 +80,7 @@ int I_GetNumaNodeThreadCount(int numaNode);
 void I_SetThreadNumaNode(std::thread &thread, int numaNode);
 
 void I_OpenShellFolder(const char*);
+FString I_GetCWD();
+bool I_ChDir(const char* path);
 
 #endif