os/os2: wasi target support

core/os/os2/path_wasi.odin

@@ -0,0 +1,84 @@
+#+private
+package os2
+
+import "base:runtime"
+
+import "core:path/filepath"
+import "core:sys/wasm/wasi"
+
+_Path_Separator        :: '/'
+_Path_Separator_String :: "/"
+_Path_List_Separator   :: ':'
+
+_is_path_separator :: proc(c: byte) -> bool {
+	return c == _Path_Separator
+}
+
+_mkdir :: proc(name: string, perm: int) -> Error {
+	dir_fd, relative, ok := match_preopen(name)
+	if !ok {
+		return .Invalid_Path
+	}
+
+	return _get_platform_error(wasi.path_create_directory(dir_fd, relative))
+}
+
+_mkdir_all :: proc(path: string, perm: int) -> Error {
+	if path == "" {
+		return .Invalid_Path
+	}
+
+	TEMP_ALLOCATOR_GUARD()
+
+	if exists(path) {
+		return .Exist
+	}
+
+	clean_path := filepath.clean(path, temp_allocator())
+	return internal_mkdir_all(clean_path)
+
+	internal_mkdir_all :: proc(path: string) -> Error {
+		dir, file := filepath.split(path)
+		if file != path && dir != "/" {
+			if len(dir) > 1 && dir[len(dir) - 1] == '/' {
+				dir = dir[:len(dir) - 1]
+			}
+			internal_mkdir_all(dir) or_return
+		}
+
+		err := _mkdir(path, 0)
+		if err == .Exist { err = nil }
+		return err
+	}
+}
+
+_remove_all :: proc(path: string) -> (err: Error) {
+	//  PERF: this works, but wastes a bunch of memory using the read_directory_iterator API
+	// and using open instead of wasi fds directly.
+	{
+		dir := open(path) or_return
+		defer close(dir)
+
+		iter := read_directory_iterator_create(dir) or_return
+		defer read_directory_iterator_destroy(&iter)
+
+		for fi in read_directory_iterator(&iter) {
+			if fi.type == .Directory {
+				_remove_all(fi.fullpath) or_return
+			} else {
+				remove(fi.fullpath) or_return
+			}
+		}
+	}
+
+	return remove(path)
+}
+
+_get_working_directory :: proc(allocator: runtime.Allocator) -> (dir: string, err: Error) {
+	return ".", .Unsupported
+}
+
+_set_working_directory :: proc(dir: string) -> (err: Error) {
+	err = .Unsupported
+	return
+}