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// 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";
"os";
"unsafe";
)
const (
blockSize = 4096 // TODO(r): use statfs
)
func clen(n []byte) int {
for i := 0; i < len(n); i++ {
if n[i] == 0 {
return i
}
}
return len(n)
}
// Negative count means read until EOF.
func Readdirnames(fd *FD, count int) (names []string, err *os.Error) {
// If this fd has no dirinfo, create one.
if fd.dirinfo == nil {
fd.dirinfo = new(DirInfo);
// The buffer must be at least a block long.
// TODO(r): use fstatfs to find fs block size.
fd.dirinfo.buf = make([]byte, blockSize);
}
d := fd.dirinfo;
size := count;
if size < 0 {
size = 100
}
names = make([]string, 0, size); // Empty with room to grow.
for count != 0 {
// Refill the buffer if necessary
if d.bufp == d.nbuf {
var errno int64;
dbuf := unsafe.Pointer(&d.buf[0]).(*syscall.Dirent);
d.nbuf, errno = syscall.Getdents(fd.fd, dbuf, int64(len(d.buf)));
if d.nbuf < 0 {
return names, os.ErrnoToError(errno)
}
if d.nbuf == 0 {
break // EOF
}
d.bufp = 0;
}
// Drain the buffer
for count != 0 && d.bufp < d.nbuf {
dirent := unsafe.Pointer(&d.buf[d.bufp]).(*syscall.Dirent);
d.bufp += int64(dirent.Reclen);
if dirent.Ino == 0 { // File absent in directory.
continue
}
count--;
if len(names) == cap(names) {
nnames := make([]string, len(names), 2*len(names));
for i := 0; i < len(names); i++ {
nnames[i] = names[i]
}
names = nnames;
}
names = names[0:len(names)+1];
names[len(names)-1] = string(dirent.Name[0:clen(dirent.Name)]);
}
}
return names, nil;
}
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