.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/fastwalk/fastwalk_dirent_namlen_linux.go

   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 // +build linux
   6 // +build !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 }