diff options
Diffstat (limited to 'vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go')
-rw-r--r-- | vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go b/vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go new file mode 100644 index 000000000..c82e57df8 --- /dev/null +++ b/vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go @@ -0,0 +1,29 @@ +// 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) +} |