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