Source file src/os/dir_plan9.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		"syscall"
    10	)
    11	
    12	func (file *File) readdir(n int) ([]FileInfo, error) {
    13		// If this file has no dirinfo, create one.
    14		if file.dirinfo == nil {
    15			file.dirinfo = new(dirInfo)
    16		}
    17		d := file.dirinfo
    18		size := n
    19		if size <= 0 {
    20			size = 100
    21			n = -1
    22		}
    23		fi := make([]FileInfo, 0, size) // Empty with room to grow.
    24		for n != 0 {
    25			// Refill the buffer if necessary.
    26			if d.bufp >= d.nbuf {
    27				nb, err := file.Read(d.buf[:])
    28	
    29				// Update the buffer state before checking for errors.
    30				d.bufp, d.nbuf = 0, nb
    31	
    32				if err != nil {
    33					if err == io.EOF {
    34						break
    35					}
    36					return fi, &PathError{"readdir", file.name, err}
    37				}
    38				if nb < syscall.STATFIXLEN {
    39					return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
    40				}
    41			}
    42	
    43			// Get a record from the buffer.
    44			b := d.buf[d.bufp:]
    45			m := int(uint16(b[0])|uint16(b[1])<<8) + 2
    46			if m < syscall.STATFIXLEN {
    47				return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
    48			}
    49	
    50			dir, err := syscall.UnmarshalDir(b[:m])
    51			if err != nil {
    52				return fi, &PathError{"readdir", file.name, err}
    53			}
    54			fi = append(fi, fileInfoFromStat(dir))
    55	
    56			d.bufp += m
    57			n--
    58		}
    59	
    60		if n >= 0 && len(fi) == 0 {
    61			return fi, io.EOF
    62		}
    63		return fi, nil
    64	}
    65	
    66	func (file *File) readdirnames(n int) (names []string, err error) {
    67		fi, err := file.Readdir(n)
    68		names = make([]string, len(fi))
    69		for i := range fi {
    70			names[i] = fi[i].Name()
    71		}
    72		return
    73	}
    74	

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