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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 (
"os";
"syscall";
"unsafe";
)
const (
blockSize = 4096 // TODO(r): use statfs
)
// Negative count means read until EOF.
func readdirnames(file *File, count int) (names []string, err Error) {
// If this file has no dirinfo, create one.
if file.dirinfo == nil {
file.dirinfo = new(dirInfo);
// The buffer must be at least a block long.
// TODO(r): use fstatfs to find fs block size.
file.dirinfo.buf = make([]byte, blockSize);
}
d := file.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 int;
d.bufp = 0;
// Final argument is (basep *uintptr) and the syscall doesn't take nil.
d.nbuf, errno = syscall.Getdirentries(file.fd, d.buf, new(uintptr));
if errno != 0 {
d.nbuf = 0;
return names, ErrnoToError(errno)
}
if d.nbuf == 0 {
break // EOF
}
}
// Drain the buffer
for count != 0 && d.bufp < d.nbuf {
dirent := (*syscall.Dirent)(unsafe.Pointer(&d.buf[d.bufp]));
if dirent.Reclen == 0 {
d.bufp = d.nbuf;
break
}
d.bufp += int(dirent.Reclen);
if dirent.Ino == 0 { // File absent in directory.
continue
}
bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]));
var name = string(bytes[0:dirent.Namlen]);
if name == "." || name == ".." { // Useless names
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] = name;
}
}
return names, nil
}
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