dir_windows.go

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package os
     6  
     7  import (
     8  	"io"
     9  	"runtime"
    10  	"syscall"
    11  )
    12  
    13  func (file *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
    14  	if !file.isdir() {
    15  		return nil, nil, nil, &PathError{Op: "readdir", Path: file.name, Err: syscall.ENOTDIR}
    16  	}
    17  	wantAll := n <= 0
    18  	if wantAll {
    19  		n = -1
    20  	}
    21  	d := &file.dirinfo.data
    22  	for n != 0 && !file.dirinfo.isempty {
    23  		if file.dirinfo.needdata {
    24  			e := file.pfd.FindNextFile(d)
    25  			runtime.KeepAlive(file)
    26  			if e != nil {
    27  				if e == syscall.ERROR_NO_MORE_FILES {
    28  					break
    29  				} else {
    30  					err = &PathError{Op: "FindNextFile", Path: file.name, Err: e}
    31  					return
    32  				}
    33  			}
    34  		}
    35  		file.dirinfo.needdata = true
    36  		name := syscall.UTF16ToString(d.FileName[0:])
    37  		if name == "." || name == ".." { // Useless names
    38  			continue
    39  		}
    40  		if mode == readdirName {
    41  			names = append(names, name)
    42  		} else {
    43  			f := newFileStatFromWin32finddata(d)
    44  			f.name = name
    45  			f.path = file.dirinfo.path
    46  			f.appendNameToPath = true
    47  			if mode == readdirDirEntry {
    48  				dirents = append(dirents, dirEntry{f})
    49  			} else {
    50  				infos = append(infos, f)
    51  			}
    52  		}
    53  		n--
    54  	}
    55  	if !wantAll && len(names)+len(dirents)+len(infos) == 0 {
    56  		return nil, nil, nil, io.EOF
    57  	}
    58  	return names, dirents, infos, nil
    59  }
    60  
    61  type dirEntry struct {
    62  	fs *fileStat
    63  }
    64  
    65  func (de dirEntry) Name() string            { return de.fs.Name() }
    66  func (de dirEntry) IsDir() bool             { return de.fs.IsDir() }
    67  func (de dirEntry) Type() FileMode          { return de.fs.Mode().Type() }
    68  func (de dirEntry) Info() (FileInfo, error) { return de.fs, nil }
    69
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