don't allow calling private functions/methods

os/os.v

@@ -21,6 +21,12 @@ import const (
 	SEEK_END
 )
 
+fn C.getline(voidptr, voidptr, voidptr) int
+
+fn C.ftell(fp voidptr) int
+
+fn todo_remove(){}
+
 fn init_os_args(argc int, _argv *byteptr) []string {
 	mut args := []string
 	# char** argv = (char**) _argv;
@@ -38,8 +44,6 @@ fn parse_windows_cmd_line(cmd byteptr) []string {
 	return s.split(' ')
 }
 
-fn C.ftell(fp voidptr) int
-
 // read_file reads the file in `path` and returns the contents.
 pub fn read_file(path string) ?string {
 	mut res := ''
@@ -185,6 +189,7 @@ pub fn open_append(path string) File {
 	return create_file(path)
 }
 
+// TODO remove
 fn create_file(file string) File {
 	return create_file2(file, 'w')
 }
@@ -227,7 +232,7 @@ fn (f File) write_at(data voidptr, size, pos int) {
 	C.fseek(f.cfile, 0, SEEK_END)
 }
 
-fn (f File) appendln(s string) {
+pub fn (f File) appendln(s string) {
 	// C.fwrite(s.str, 1, s.len, f.cfile)
 	// ss := s.clone()
 	// TODO perf
@@ -236,7 +241,7 @@ fn (f File) appendln(s string) {
 	C.fputs('\n', f.cfile)
 }
 
-fn (f File) close() {
+pub fn (f File) close() {
 	C.fclose(f.cfile)
 }
 
@@ -319,10 +324,6 @@ pub fn getenv(key string) string {
 	return tos2(s)
 }
 
-fn exit(code int) {
-	C.exit(code)
-}
-
 // `file_exists` returns true if `path` exists.
 pub fn file_exists(path string) bool {
 	// # return access( path.str, F_OK ) != -1 ;
@@ -397,7 +398,6 @@ pub fn filename(path string) string {
 	return path.all_after('/')
 }
 
-fn C.getline(voidptr, voidptr, voidptr) int
 
 pub fn get_line() string {
 	max := 256

os/os_mac.v

@@ -28,13 +28,13 @@ fn chdir(path string) {
 	C.chdir(path.cstr())
 }
 
-fn getwd() string {
+pub fn getwd() string {
 	cwd := malloc(1024)
 	# if (getcwd(cwd, 1024)) return tos2(cwd);
 	return ''
 }
 
-fn ls(path string) []string {
+pub fn ls(path string) []string {
 	mut res := []string
 	# DIR *dir;
 	# struct dirent *ent;