mirror of
https://github.com/golang/go
synced 2024-10-05 06:21:24 -06:00
3b864e4195
whole-package compilation. new Makefiles, tests now in separate package bytes flag fmt io math once os reflect strconv sync time utf8 delete import "xxx" in package xxx. inside package xxx, xxx is not declared anymore so s/xxx.//g delete file and package level forward declarations. note the new internal_test.go and sync and strconv to provide public access to internals during testing. the installed version of the package omits that file and thus does not open the internals to all clients. R=r OCL=33065 CL=33097
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"syscall";
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"unsafe";
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)
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const (
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blockSize = 4096 // TODO(r): use statfs
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)
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func (file *File) Readdirnames(count int) (names []string, err Error) {
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// If this file has no dirinfo, create one.
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if file.dirinfo == nil {
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file.dirinfo = new(dirInfo);
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// The buffer must be at least a block long.
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// TODO(r): use fstatfs to find fs block size.
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file.dirinfo.buf = make([]byte, blockSize);
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}
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d := file.dirinfo;
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size := count;
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if size < 0 {
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size = 100
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}
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names = make([]string, 0, size); // Empty with room to grow.
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for count != 0 {
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// Refill the buffer if necessary
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if d.bufp >= d.nbuf {
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var errno int;
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d.bufp = 0;
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// Final argument is (basep *uintptr) and the syscall doesn't take nil.
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d.nbuf, errno = syscall.Getdirentries(file.fd, d.buf, new(uintptr));
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if errno != 0 {
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d.nbuf = 0;
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return names, NewSyscallError("getdirentries", errno);
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}
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if d.nbuf <= 0 {
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break // EOF
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}
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}
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// Drain the buffer
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for count != 0 && d.bufp < d.nbuf {
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dirent := (*syscall.Dirent)(unsafe.Pointer(&d.buf[d.bufp]));
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if dirent.Reclen == 0 {
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d.bufp = d.nbuf;
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break
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}
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d.bufp += int(dirent.Reclen);
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if dirent.Ino == 0 { // File absent in directory.
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continue
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}
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bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]));
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var name = string(bytes[0:dirent.Namlen]);
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if name == "." || name == ".." { // Useless names
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continue
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}
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count--;
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if len(names) == cap(names) {
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nnames := make([]string, len(names), 2*len(names));
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for i := 0; i < len(names); i++ {
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nnames[i] = names[i]
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}
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names = nnames;
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}
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names = names[0:len(names)+1];
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names[len(names)-1] = name;
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}
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}
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return names, nil
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}
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