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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"
)

//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
}