mirror of https://go.googlesource.com/go
102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
// Copyright 2009 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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//go:build unix || (js && wasm) || wasip1
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package syscall
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import (
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"internal/byteorder"
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"internal/goarch"
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"runtime"
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"unsafe"
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)
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// readInt returns the size-bytes unsigned integer in native byte order at offset off.
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func readInt(b []byte, off, size uintptr) (u uint64, ok bool) {
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if len(b) < int(off+size) {
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return 0, false
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}
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if goarch.BigEndian {
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return readIntBE(b[off:], size), true
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}
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return readIntLE(b[off:], size), true
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}
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func readIntBE(b []byte, size uintptr) uint64 {
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switch size {
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case 1:
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return uint64(b[0])
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case 2:
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return uint64(byteorder.BeUint16(b))
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case 4:
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return uint64(byteorder.BeUint32(b))
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case 8:
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return uint64(byteorder.BeUint64(b))
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default:
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panic("syscall: readInt with unsupported size")
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}
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}
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func readIntLE(b []byte, size uintptr) uint64 {
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switch size {
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case 1:
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return uint64(b[0])
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case 2:
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return uint64(byteorder.LeUint16(b))
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case 4:
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return uint64(byteorder.LeUint32(b))
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case 8:
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return uint64(byteorder.LeUint64(b))
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default:
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panic("syscall: readInt with unsupported size")
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}
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}
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// ParseDirent parses up to max directory entries in buf,
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// appending the names to names. It returns the number of
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// bytes consumed from buf, the number of entries added
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// to names, and the new names slice.
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func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) {
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origlen := len(buf)
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count = 0
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for max != 0 && len(buf) > 0 {
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reclen, ok := direntReclen(buf)
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if !ok || reclen > uint64(len(buf)) {
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return origlen, count, names
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}
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rec := buf[:reclen]
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buf = buf[reclen:]
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ino, ok := direntIno(rec)
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if !ok {
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break
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}
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// See src/os/dir_unix.go for the reason why this condition is
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// excluded on wasip1.
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if ino == 0 && runtime.GOOS != "wasip1" { // File absent in directory.
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continue
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}
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const namoff = uint64(unsafe.Offsetof(Dirent{}.Name))
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namlen, ok := direntNamlen(rec)
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if !ok || namoff+namlen > uint64(len(rec)) {
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break
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}
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name := rec[namoff : namoff+namlen]
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for i, c := range name {
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if c == 0 {
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name = name[:i]
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break
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}
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}
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// Check for useless names before allocating a string.
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if string(name) == "." || string(name) == ".." {
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continue
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}
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max--
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count++
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names = append(names, string(name))
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}
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return origlen - len(buf), count, names
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}
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