directory.cpp

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/*
 * This file is part of the µOS++ distribution.
 *   (https://github.com/micro-os-plus)
 * Copyright (c) 2015-2023 Liviu Ionescu. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software
 * for any purpose is hereby granted, under the terms of the MIT license.
 *
 * If a copy of the license was not distributed with this file, it can
 * be obtained from https://opensource.org/licenses/mit/.
 */
 
#if defined(OS_USE_OS_APP_CONFIG_H)
#include <cmsis-plus/os-app-config.h>
#endif
 
#include <cmsis-plus/posix-io/directory.h>
#include <cmsis-plus/posix-io/file-system.h>
 
#include <cmsis-plus/diag/trace.h>
 
#include <cerrno>
#include <cassert>
#include <string.h>
 
// ----------------------------------------------------------------------------
 
namespace os
{
  namespace posix
  {
    // ========================================================================
 
    directory::directory (directory_impl& impl) :
        impl_ (impl)
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory::%s()=%p\n", __func__, this);
#endif
    }
 
    directory::~directory ()
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory::%s() @%p\n", __func__, this);
#endif
    }
 
    // ------------------------------------------------------------------------
 
    /* struct */ dirent*
    directory::read (void)
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory::%s() @%p\n", __func__, this);
#endif
 
      // assert(file_system_ != nullptr);
 
      // POSIX requires not to change errno when end of directory is
      // encountered. However, in this implementation, errno is
      // always cleared when entering system calls.
      errno = 0;
 
      // Execute the implementation specific code.
      return impl ().do_read ();
    }
 
    void
    directory::rewind (void)
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory::%s() @%p\n", __func__, this);
#endif
 
      // assert(file_system_ != nullptr);
 
      // POSIX does not mention what to do with errno.
      errno = 0;
 
      // Execute the implementation specific code.
      impl ().do_rewind ();
    }
 
    int
    directory::close (void)
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory::%s() @%p\n", __func__, this);
#endif
 
      // assert(file_system_ != nullptr);
      errno = 0;
 
      // Execute the implementation specific code.
      int ret = impl ().do_close ();
      if (ret != 0)
        {
          trace::printf ("directory::%s() @%p do_close() returned %d\n",
                         __func__, this, ret);
        }
 
      // The file object will be deallocated at the next open.
      get_file_system ().add_deferred_directory (this);
 
      return ret;
    }
 
    // ========================================================================
 
    directory_impl::directory_impl (/* class */ file_system& fs) :
        file_system_ (fs)
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory_impl::%s()=%p\n", __func__, this);
#endif
      memset (&dir_entry_, 0, sizeof(/* struct */ dirent));
    }
 
    directory_impl::~directory_impl ()
    {
#if defined(OS_TRACE_POSIX_IO_DIRECTORY)
      trace::printf ("directory_impl::%s() @%p\n", __func__, this);
#endif
    }
 
  // ========================================================================
 
  } /* namespace posix */
} /* namespace os */
 
// ----------------------------------------------------------------------------