Subversion Repositories openrisc

// 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"

)

//extern opendir

func libc_opendir(*byte) *syscall.DIR

//extern closedir

func libc_closedir(*syscall.DIR) int

// FIXME: pathconf returns long, not int.

//extern pathconf

func libc_pathconf(*byte, int) int

func clen(n []byte) int {

        for i := 0; i < len(n); i++ {

                if n[i] == 0 {

                        return i

                }

        }

        return len(n)

}

var elen int

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

}