--- /dev/null
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && !appengine
+// +build linux,!appengine
+
+package fastwalk
+
+import (
+ "bytes"
+ "syscall"
+ "unsafe"
+)
+
+func direntNamlen(dirent *syscall.Dirent) uint64 {
+ const fixedHdr = uint16(unsafe.Offsetof(syscall.Dirent{}.Name))
+ nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
+ const nameBufLen = uint16(len(nameBuf))
+ limit := dirent.Reclen - fixedHdr
+ if limit > nameBufLen {
+ limit = nameBufLen
+ }
+ nameLen := bytes.IndexByte(nameBuf[:limit], 0)
+ if nameLen < 0 {
+ panic("failed to find terminating 0 byte in dirent")
+ }
+ return uint64(nameLen)
+}