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e07cf5db27
Implement ParseDirent in x/sys/unix instead of calling syscall.ParseDirent. The latter uses offsets into syscall.Dirent which might not be matching unix.Dirent depending on Go version. This is e.g. the case with of FreeBSD whose Dirent structure was updated for Go 1.12. This fixes TestDirent and TestGetdirentries on freebsd with Go 1.11 Reverts CL 88475 Change-Id: I04318f59c6fbf148c75ce3667255a0c0428288e2 Reviewed-on: https://go-review.googlesource.com/c/sys/+/183897 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Benny Siegert <bsiegert@gmail.com>
103 lines
3.0 KiB
Go
103 lines
3.0 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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// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
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package unix
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import "unsafe"
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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 isBigEndian {
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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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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[1]) | uint64(b[0])<<8
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case 4:
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[3]) | uint64(b[2])<<8 | uint64(b[1])<<16 | uint64(b[0])<<24
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case 8:
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
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uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
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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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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[0]) | uint64(b[1])<<8
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case 4:
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24
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case 8:
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
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uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
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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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if ino == 0 { // 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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