93 lines
2.3 KiB
Go
93 lines
2.3 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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package os
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import (
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"io"
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"syscall"
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"unsafe"
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)
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func libc_dup(fd int) int __asm__ ("dup")
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func libc_opendir(*byte) *syscall.DIR __asm__ ("opendir")
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func libc_closedir(*syscall.DIR) int __asm__ ("closedir")
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// FIXME: pathconf returns long, not int.
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func libc_pathconf(*byte, int) int __asm__ ("pathconf")
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func clen(n []byte) int {
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for i := 0; i < len(n); i++ {
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if n[i] == 0 {
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return i
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}
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}
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return len(n)
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}
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var elen int;
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// Readdirnames reads and returns a slice of names from the directory f.
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//
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// If n > 0, Readdirnames returns at most n names. In this case, if
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// Readdirnames returns an empty slice, it will return a non-nil error
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// explaining why. At the end of a directory, the error is os.EOF.
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//
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// If n <= 0, Readdirnames returns all the names from the directory in
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// a single slice. In this case, if Readdirnames succeeds (reads all
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// the way to the end of the directory), it returns the slice and a
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// nil error. If it encounters an error before the end of the
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// directory, Readdirnames returns the names read until that point and
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// a non-nil error.
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func (file *File) Readdirnames(n int) (names []string, err error) {
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if elen == 0 {
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var dummy syscall.Dirent;
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elen = (unsafe.Offsetof(dummy.Name) +
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libc_pathconf(syscall.StringBytePtr(file.name), syscall.PC_NAME_MAX) +
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1);
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}
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if file.dirinfo == nil {
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file.dirinfo = new(dirInfo)
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file.dirinfo.buf = make([]byte, elen)
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file.dirinfo.dir = libc_opendir(syscall.StringBytePtr(file.name))
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}
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entry_dirent := unsafe.Pointer(&file.dirinfo.buf[0]).(*syscall.Dirent)
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size := n
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if size < 0 {
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size = 100
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n = -1
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}
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names = make([]string, 0, size) // Empty with room to grow.
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dir := file.dirinfo.dir
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if dir == nil {
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return names, NewSyscallError("opendir", syscall.GetErrno())
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}
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for n != 0 {
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var result *syscall.Dirent
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i := libc_readdir_r(dir, entry_dirent, &result)
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if i != 0 {
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return names, NewSyscallError("readdir_r", i)
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}
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if result == nil {
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break // EOF
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}
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var name = string(result.Name[0:clen(result.Name[0:])])
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if name == "." || name == ".." { // Useless names
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continue
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}
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names = append(names, name)
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n--
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}
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if n >= 0 && len(names) == 0 {
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return names, io.EOF
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}
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return names, nil
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}
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