engine: filesystem: fixed current directory changing for Windows

engine/common/common.h

@@ -566,6 +566,7 @@ int FS_FileTime( const char *filename, qboolean gamedironly );
 int FS_Print( file_t *file, const char *msg );
 qboolean FS_Rename( const char *oldname, const char *newname );
 int FS_FileExists( const char *filename, int gamedironly );
+int FS_SetCurrentDirectory( const char *path );
 qboolean FS_SysFileExists( const char *path, qboolean casesensitive );
 qboolean FS_FileCopy( file_t *pOutput, file_t *pInput, int fileSize );
 qboolean FS_Delete( const char *path );

engine/common/filesystem.c

@@ -463,6 +463,22 @@ static const char *FS_FixFileCase( const char *path )
 	return path;
 }
 
+#if XASH_WIN32
+/*
+====================
+FS_PathToWideChar
+
+Converts input UTF-8 string to wide char string.
+====================
+*/
+const wchar_t *FS_PathToWideChar( const char *path )
+{
+	static wchar_t pathBuffer[MAX_PATH];
+	MultiByteToWideChar( CP_UTF8, 0, path, -1, pathBuffer, MAX_PATH );
+	return pathBuffer;
+}
+#endif
+
 /*
 ====================
 FS_AddFileToPack
@@ -2240,7 +2256,11 @@ static file_t *FS_SysOpen( const char *filepath, const char *mode )
 	file->filetime = FS_SysFileTime( filepath );
 	file->ungetc = EOF;
 
+#if XASH_WIN32
+	file->handle = _wopen( FS_PathToWideChar(filepath), mod | opt, 0666 );
+#else
 	file->handle = open( filepath, mod|opt, 0666 );
+#endif
 
 #if !XASH_WIN32
 	if( file->handle < 0 )
@@ -2394,6 +2414,24 @@ qboolean FS_SysFileExists( const char *path, qboolean caseinsensitive )
 #endif
 }
 
+/*
+==================
+FS_SetCurrentDirectory
+
+Sets current directory, path should be in UTF-8 encoding
+==================
+*/
+int FS_SetCurrentDirectory( const char *path )
+{
+#if XASH_WIN32
+	return SetCurrentDirectoryW( FS_PathToWideChar(path) );
+#elif XASH_POSIX
+	return !chdir( path );
+#else
+#error
+#endif
+}
+
 /*
 ==================
 FS_SysFolderExists

engine/common/host.c

@@ -980,7 +980,7 @@ void Host_InitCommon( int argc, char **argv, const char *progname, qboolean bCha
 	if( len && host.rodir[len - 1] == '/' )
 		host.rodir[len - 1] = 0;
 
-	if( !COM_CheckStringEmpty( host.rootdir ) || SetCurrentDirectory( host.rootdir ) != 0 )
+	if( !COM_CheckStringEmpty( host.rootdir ) || FS_SetCurrentDirectory( host.rootdir ) != 0 )
 		Con_Reportf( "%s is working directory now\n", host.rootdir );
 	else
 		Sys_Error( "Changing working directory to %s failed.\n", host.rootdir );