gopls/internal/fastwalk/fastwalk_dirent_namlen

1	// Copyright 2018 The Go Authors. All rights reserved.
2	// Use of this source code is governed by a BSD-style
3	// license that can be found in the LICENSE file.
4
5	//go:build linux && !appengine
6	// +build linux,!appengine
7
8	package fastwalk
9
10	import (
11	"bytes"
12	"syscall"
13	"unsafe"
14	)
15
16	func direntNamlen(dirent *syscall.Dirent) uint64 {
17	const fixedHdr = uint16(unsafe.Offsetof(syscall.Dirent{}.Name))
18	nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
19	const nameBufLen = uint16(len(nameBuf))
20	limit := dirent.Reclen - fixedHdr
21	if limit > nameBufLen {
22	limit = nameBufLen
23	}
24	nameLen := bytes.IndexByte(nameBuf[:limit], 0)
25	if nameLen < 0 {
26	panic("failed to find terminating 0 byte in dirent")
27	}
28	return uint64(nameLen)
29	}
30

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