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//===--- Implementation of a platform independent Dir data structure ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "dir.h"
#include "src/__support/CPP/new.h"
#include "src/__support/error_or.h"
#include "src/errno/libc_errno.h" // For error macros
namespace __llvm_libc {
ErrorOr<Dir *> Dir::open(const char *path) {
auto fd = platform_opendir(path);
if (!fd)
return __llvm_libc::Error(fd.error());
__llvm_libc::AllocChecker ac;
Dir *dir = new (ac) Dir(fd);
if (!ac)
return __llvm_libc::Error(ENOMEM);
return dir;
}
ErrorOr<struct ::dirent *> Dir::read() {
MutexLock lock(&mutex);
if (readptr >= fillsize) {
auto readsize = platform_fetch_dirents(fd, buffer);
if (!readsize)
return __llvm_libc::Error(readsize.error());
fillsize = readsize;
readptr = 0;
}
if (fillsize == 0)
return nullptr;
struct ::dirent *d = reinterpret_cast<struct ::dirent *>(buffer + readptr);
#ifdef __unix__
// The d_reclen field is available on Linux but not required by POSIX.
readptr += d->d_reclen;
#else
// Other platforms have to implement how the read pointer is to be updated.
#error "DIR read pointer update is missing."
#endif
return d;
}
int Dir::close() {
{
MutexLock lock(&mutex);
int retval = platform_closedir(fd);
if (retval != 0)
return retval;
}
delete this;
return 0;
}
} // namespace __llvm_libc
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