diff options
Diffstat (limited to 'src/pkg/os/dir_unix.go')
-rw-r--r-- | src/pkg/os/dir_unix.go | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/pkg/os/dir_unix.go b/src/pkg/os/dir_unix.go new file mode 100644 index 000000000..7835ed52b --- /dev/null +++ b/src/pkg/os/dir_unix.go @@ -0,0 +1,67 @@ +// 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 ( + "syscall" +) + +const ( + blockSize = 4096 +) + +// Readdirnames reads and returns a slice of names from the directory f. +// +// If n > 0, Readdirnames returns at most n names. In this case, if +// Readdirnames returns an empty slice, it will return a non-nil error +// explaining why. At the end of a directory, the error is os.EOF. +// +// If n <= 0, Readdirnames returns all the names from the directory in +// a single slice. In this case, if Readdirnames succeeds (reads all +// the way to the end of the directory), it returns the slice and a +// nil os.Error. If it encounters an error before the end of the +// directory, Readdirnames returns the names read until that point and +// a non-nil error. +func (f *File) Readdirnames(n int) (names []string, err Error) { + // If this file has no dirinfo, create one. + if f.dirinfo == nil { + f.dirinfo = new(dirInfo) + // The buffer must be at least a block long. + f.dirinfo.buf = make([]byte, blockSize) + } + d := f.dirinfo + + size := n + if size <= 0 { + size = 100 + n = -1 + } + + names = make([]string, 0, size) // Empty with room to grow. + for n != 0 { + // Refill the buffer if necessary + if d.bufp >= d.nbuf { + d.bufp = 0 + var errno int + d.nbuf, errno = syscall.ReadDirent(f.fd, d.buf) + if errno != 0 { + return names, NewSyscallError("readdirent", errno) + } + if d.nbuf <= 0 { + break // EOF + } + } + + // Drain the buffer + var nb, nc int + nb, nc, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], n, names) + d.bufp += nb + n -= nc + } + if n >= 0 && len(names) == 0 { + return names, EOF + } + return names, nil +} |