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// Copyright 2023 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 wasip1
package os
import (
"syscall"
"unsafe"
)
// https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md#-dirent-record
const sizeOfDirent = 24
func direntIno(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
}
func direntReclen(buf []byte) (uint64, bool) {
namelen, ok := direntNamlen(buf)
return sizeOfDirent + namelen, ok
}
func direntNamlen(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Namlen), unsafe.Sizeof(syscall.Dirent{}.Namlen))
}
func direntType(buf []byte) FileMode {
off := unsafe.Offsetof(syscall.Dirent{}.Type)
if off >= uintptr(len(buf)) {
return ^FileMode(0) // unknown
}
switch syscall.Filetype(buf[off]) {
case syscall.FILETYPE_BLOCK_DEVICE:
return ModeDevice
case syscall.FILETYPE_CHARACTER_DEVICE:
return ModeDevice | ModeCharDevice
case syscall.FILETYPE_DIRECTORY:
return ModeDir
case syscall.FILETYPE_REGULAR_FILE:
return 0
case syscall.FILETYPE_SOCKET_DGRAM:
return ModeSocket
case syscall.FILETYPE_SOCKET_STREAM:
return ModeSocket
case syscall.FILETYPE_SYMBOLIC_LINK:
return ModeSymlink
}
return ^FileMode(0) // unknown
}
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