| 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/new.h" |
| 12 | #include "src/__support/error_or.h" |
| 13 | #include "src/errno/libc_errno.h" // For error macros |
| 14 | |
| 15 | namespace LIBC_NAMESPACE { |
| 16 | |
| 17 | ErrorOr<Dir *> Dir::open(const char *path) { |
| 18 | auto fd = platform_opendir(name: path); |
| 19 | if (!fd) |
| 20 | return LIBC_NAMESPACE::Error(fd.error()); |
| 21 | |
| 22 | LIBC_NAMESPACE::AllocChecker ac; |
| 23 | Dir *dir = new (ac) Dir(fd.value()); |
| 24 | if (!ac) |
| 25 | return LIBC_NAMESPACE::Error(ENOMEM); |
| 26 | return dir; |
| 27 | } |
| 28 | |
| 29 | ErrorOr<struct ::dirent *> Dir::read() { |
| 30 | MutexLock lock(&mutex); |
| 31 | if (readptr >= fillsize) { |
| 32 | auto readsize = platform_fetch_dirents(fd, buffer); |
| 33 | if (!readsize) |
| 34 | return LIBC_NAMESPACE::Error(readsize.error()); |
| 35 | fillsize = readsize.value(); |
| 36 | readptr = 0; |
| 37 | } |
| 38 | if (fillsize == 0) |
| 39 | return nullptr; |
| 40 | |
| 41 | struct ::dirent *d = reinterpret_cast<struct ::dirent *>(buffer + readptr); |
| 42 | #ifdef __linux__ |
| 43 | // The d_reclen field is available on Linux but not required by POSIX. |
| 44 | readptr += d->d_reclen; |
| 45 | #else |
| 46 | // Other platforms have to implement how the read pointer is to be updated. |
| 47 | #error "DIR read pointer update is missing." |
| 48 | #endif |
| 49 | return d; |
| 50 | } |
| 51 | |
| 52 | int Dir::close() { |
| 53 | { |
| 54 | MutexLock lock(&mutex); |
| 55 | int retval = platform_closedir(fd); |
| 56 | if (retval != 0) |
| 57 | return retval; |
| 58 | } |
| 59 | delete this; |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | } // namespace LIBC_NAMESPACE |
| 64 |