1//===--- Implementation of a platform independent Dir data structure ------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "dir.h"
10
11#include "src/__support/CPP/mutex.h" // lock_guard
12#include "src/__support/CPP/new.h"
13#include "src/__support/error_or.h"
14#include "src/__support/libc_errno.h" // For error macros
15#include "src/__support/macros/config.h"
16
17namespace LIBC_NAMESPACE_DECL {
18
19ErrorOr<Dir *> Dir::open(const char *path) {
20 auto fd = platform_opendir(path);
21 if (!fd)
22 return LIBC_NAMESPACE::Error(fd.error());
23
24 LIBC_NAMESPACE::AllocChecker ac;
25 Dir *dir = new (ac) Dir(fd.value());
26 if (!ac)
27 return LIBC_NAMESPACE::Error(ENOMEM);
28 return dir;
29}
30
31ErrorOr<struct ::dirent *> Dir::read() {
32 cpp::lock_guard lock(mutex);
33 if (readptr >= fillsize) {
34 auto readsize = platform_fetch_dirents(fd, buffer);
35 if (!readsize)
36 return LIBC_NAMESPACE::Error(readsize.error());
37 fillsize = readsize.value();
38 readptr = 0;
39 }
40 if (fillsize == 0)
41 return nullptr;
42
43 struct ::dirent *d = reinterpret_cast<struct ::dirent *>(buffer + readptr);
44#ifdef __linux__
45 // The d_reclen field is available on Linux but not required by POSIX.
46 readptr += d->d_reclen;
47#else
48 // Other platforms have to implement how the read pointer is to be updated.
49#error "DIR read pointer update is missing."
50#endif
51 return d;
52}
53
54int Dir::close() {
55 {
56 cpp::lock_guard lock(mutex);
57 int retval = platform_closedir(fd);
58 if (retval != 0)
59 return retval;
60 }
61 delete this;
62 return 0;
63}
64
65} // namespace LIBC_NAMESPACE_DECL
66

source code of libc/src/__support/File/dir.cpp