1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "nacl_io/getdents_helper.h"
13 #include "nacl_io/log.h"
15 #include "sdk_util/macros.h"
19 GetDentsHelper::GetDentsHelper()
20 : curdir_ino_(0), parentdir_ino_(0), init_defaults_(false) {
24 GetDentsHelper::GetDentsHelper(ino_t curdir_ino, ino_t parentdir_ino)
25 : curdir_ino_(curdir_ino),
26 parentdir_ino_(parentdir_ino),
27 init_defaults_(true) {
31 void GetDentsHelper::Reset() {
36 void GetDentsHelper::Initialize() {
38 // Add the default entries: "." and ".."
39 AddDirent(curdir_ino_, ".", 1);
40 AddDirent(parentdir_ino_, "..", 2);
44 void GetDentsHelper::AddDirent(ino_t ino, const char* name, size_t namelen) {
46 dirents_.push_back(dirent());
47 dirent& entry = dirents_.back();
49 entry.d_off = sizeof(dirent);
50 entry.d_reclen = sizeof(dirent);
53 namelen = strlen(name);
55 size_t d_name_max = MEMBER_SIZE(dirent, d_name) - 1; // -1 for \0.
56 size_t copylen = std::min(d_name_max, namelen);
57 strncpy(&entry.d_name[0], name, copylen);
58 entry.d_name[copylen] = 0;
61 Error GetDentsHelper::GetDents(size_t offs,
64 int* out_bytes) const {
67 // If the buffer pointer is invalid, fail
69 LOG_TRACE("dirent pointer is NULL.");
73 // If the buffer is too small, fail
74 if (size < sizeof(dirent)) {
75 LOG_TRACE("dirent buffer size is too small: %d < %d", size, sizeof(dirent));
79 // Force size to a multiple of dirent
80 size -= size % sizeof(dirent);
82 size_t max = dirents_.size() * sizeof(dirent);
84 // OK, trying to read past the end.
88 if (offs + size >= max)
91 memcpy(pdir, reinterpret_cast<const char*>(dirents_.data()) + offs, size);
96 } // namespace nacl_io