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// Copyright 2009 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.
package os
import (
"io"
"syscall"
"unsafe"
)
func libc_dup(fd int) int __asm__ ("dup")
func libc_opendir(*byte) *syscall.DIR __asm__ ("opendir")
func libc_closedir(*syscall.DIR) int __asm__ ("closedir")
// FIXME: pathconf returns long, not int.
func libc_pathconf(*byte, int) int __asm__ ("pathconf")
func clen(n []byte) int {
for i := 0; i < len(n); i++ {
if n[i] == 0 {
return i
}
}
return len(n)
}
var elen int;
// Readdirnames reads and returns a slice of names from the directory f.
//
// If n > 0, Readdirnames returns at most n names. In this case, if
// Readdirnames returns an empty slice, it will return a non-nil error
// explaining why. At the end of a directory, the error is os.EOF.
//
// If n <= 0, Readdirnames returns all the names from the directory in
// a single slice. In this case, if Readdirnames succeeds (reads all
// the way to the end of the directory), it returns the slice and a
// nil error. If it encounters an error before the end of the
// directory, Readdirnames returns the names read until that point and
// a non-nil error.
func (file *File) Readdirnames(n int) (names []string, err error) {
if elen == 0 {
var dummy syscall.Dirent;
elen = (unsafe.Offsetof(dummy.Name) +
libc_pathconf(syscall.StringBytePtr(file.name), syscall.PC_NAME_MAX) +
1);
}
if file.dirinfo == nil {
file.dirinfo = new(dirInfo)
file.dirinfo.buf = make([]byte, elen)
file.dirinfo.dir = libc_opendir(syscall.StringBytePtr(file.name))
}
entry_dirent := unsafe.Pointer(&file.dirinfo.buf[0]).(*syscall.Dirent)
size := n
if size < 0 {
size = 100
n = -1
}
names = make([]string, 0, size) // Empty with room to grow.
dir := file.dirinfo.dir
if dir == nil {
return names, NewSyscallError("opendir", syscall.GetErrno())
}
for n != 0 {
var result *syscall.Dirent
i := libc_readdir_r(dir, entry_dirent, &result)
if i != 0 {
return names, NewSyscallError("readdir_r", i)
}
if result == nil {
break // EOF
}
var name = string(result.Name[0:clen(result.Name[0:])])
if name == "." || name == ".." { // Useless names
continue
}
names = append(names, name)
n--
}
if n >= 0 && len(names) == 0 {
return names, io.EOF
}
return names, nil
}
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