Beispiel #1
0
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
}
Beispiel #2
0
// arg is an open *File or a path string.
func dirstat(arg interface{}) (*syscall.Dir, error) {
	var name string
	var err error

	size := syscall.STATFIXLEN + 16*4

	for i := 0; i < 2; i++ {
		buf := make([]byte, _BIT16SZ+size)

		var n int
		switch a := arg.(type) {
		case *File:
			name = a.name
			n, err = syscall.Fstat(a.fd, buf)
		case string:
			name = a
			n, err = syscall.Stat(a, buf)
		default:
			panic("phase error in dirstat")
		}

		if n < _BIT16SZ {
			return nil, &PathError{"stat", name, err}
		}

		// Pull the real size out of the stat message.
		size = int(uint16(buf[0]) | uint16(buf[1])<<8)

		// If the stat message is larger than our buffer we will
		// go around the loop and allocate one that is big enough.
		if size <= n {
			d, err := syscall.UnmarshalDir(buf[:n])
			if err != nil {
				return nil, &PathError{"stat", name, err}
			}
			return d, nil
		}

	}

	if err == nil {
		err = syscall.ErrBadStat
	}

	return nil, &PathError{"stat", name, err}
}
Beispiel #3
0
// arg is an open *File or a path string.
func dirstat(arg interface{}) (*syscall.Dir, error) {
	var name string

	// This is big enough for most stat messages
	// and rounded to a multiple of 128 bytes.
	size := (syscall.STATFIXLEN + 16*4 + 128) &^ 128

	for i := 0; i < 2; i++ {
		buf := make([]byte, size)

		var n int
		var err error
		switch a := arg.(type) {
		case *File:
			name = a.name
			n, err = syscall.Fstat(a.fd, buf)
		case string:
			name = a
			n, err = syscall.Stat(a, buf)
		default:
			panic("phase error in dirstat")
		}
		if err != nil {
			return nil, &PathError{"stat", name, err}
		}
		if n < syscall.STATFIXLEN {
			return nil, &PathError{"stat", name, syscall.ErrShortStat}
		}

		// Pull the real size out of the stat message.
		size = int(uint16(buf[0]) | uint16(buf[1])<<8)

		// If the stat message is larger than our buffer we will
		// go around the loop and allocate one that is big enough.
		if size > n {
			continue
		}

		d, err := syscall.UnmarshalDir(buf[:n])
		if err != nil {
			return nil, &PathError{"stat", name, err}
		}
		return d, nil
	}
	return nil, &PathError{"stat", name, syscall.ErrBadStat}
}