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Source file src/os/dir_plan9.go

Documentation: os

  // 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"
  )
  
  func (file *File) readdir(n int) ([]FileInfo, error) {
  	// If this file has no dirinfo, create one.
  	if file.dirinfo == nil {
  		file.dirinfo = new(dirInfo)
  	}
  	d := file.dirinfo
  	size := n
  	if size <= 0 {
  		size = 100
  		n = -1
  	}
  	fi := make([]FileInfo, 0, size) // Empty with room to grow.
  	for n != 0 {
  		// Refill the buffer if necessary.
  		if d.bufp >= d.nbuf {
  			nb, err := file.Read(d.buf[:])
  
  			// Update the buffer state before checking for errors.
  			d.bufp, d.nbuf = 0, nb
  
  			if err != nil {
  				if err == io.EOF {
  					break
  				}
  				return fi, &PathError{"readdir", file.name, err}
  			}
  			if nb < syscall.STATFIXLEN {
  				return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
  			}
  		}
  
  		// Get a record from the buffer.
  		b := d.buf[d.bufp:]
  		m := int(uint16(b[0])|uint16(b[1])<<8) + 2
  		if m < syscall.STATFIXLEN {
  			return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
  		}
  
  		dir, err := syscall.UnmarshalDir(b[:m])
  		if err != nil {
  			return fi, &PathError{"readdir", file.name, err}
  		}
  		fi = append(fi, fileInfoFromStat(dir))
  
  		d.bufp += m
  		n--
  	}
  
  	if n >= 0 && len(fi) == 0 {
  		return fi, io.EOF
  	}
  	return fi, nil
  }
  
  func (file *File) readdirnames(n int) (names []string, err error) {
  	fi, err := file.Readdir(n)
  	names = make([]string, len(fi))
  	for i := range fi {
  		names[i] = fi[i].Name()
  	}
  	return
  }
  

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