feat: add cross_dirent

This adds the dirent library for windows.
https://github.com/tronkko/dirent

cross_dirent/.gitignore

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+/CMakeCache.txt
+/CMakeFiles
+/CTestTestfile.cmake
+/DartConfiguration.tcl
+/Makefile
+/Testing
+/Win32
+/cmake_install.cmake
+/find
+/locate
+/ls
+/scandir
+/cat
+/t-compile
+/t-dirent
+/t-scandir
+/t-cplusplus
+/t-unicode
+/t-strverscmp
+/t-utf8
+/updatedb
+/*.filters
+/*.vcxproj
+/*.dir

cross_dirent/CMakeLists.txt

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+cmake_minimum_required (VERSION 2.8.12)
+project (dirent LANGUAGES C CXX)
+
+# User options
+option(DIRENT_BUILD_TESTS "Build bundled tests" ON)
+message(STATUS "Build test and example programs: ${DIRENT_BUILD_TESTS}")
+
+# Initialize C and C++ compilers
+enable_language (C CXX)
+
+# Compile in debug mode by default
+if (NOT CMAKE_BUILD_TYPE)
+    set (CMAKE_BUILD_TYPE Debug
+        CACHE STRING
+        "Type of build: None Debug Release RelWithDebInfo MinSizeRel."
+        FORCE
+    )
+endif (NOT CMAKE_BUILD_TYPE)
+
+# Use the include directory only on Windows
+if (WIN32)
+    include_directories (${CMAKE_SOURCE_DIR}/include)
+endif (WIN32)
+
+# Install dirent.h
+if (WIN32)
+    install (FILES include/dirent.h DESTINATION include)
+endif (WIN32)
+
+# Add distclean target
+add_custom_target (distclean
+    COMMAND ${CMAKE_BUILD_TOOL} clean
+    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_SOURCE_DIR}/distclean.cmake
+)
+
+# Build example programs
+if(DIRENT_BUILD_TESTS)
+    add_executable (find examples/find.c)
+    add_executable (ls examples/ls.c)
+    add_executable (locate examples/locate.c)
+    add_executable (updatedb examples/updatedb.c)
+    add_executable (scandir examples/scandir.c)
+    add_executable (cat examples/cat.c)
+    add_executable (dirls examples/dirls.c)
+
+    # Build test programs
+    include (CTest)
+    add_custom_target (check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C ${CMAKE_CFG_INTDIR})
+    function (add_test_executable TEST_NAME)
+        add_executable (${TEST_NAME} EXCLUDE_FROM_ALL ${ARGN})
+        add_test (NAME ${TEST_NAME} WORKING_DIRECTORY ${CMAKE_SOURCE_DIR} COMMAND $<TARGET_FILE:${TEST_NAME}>)
+        add_dependencies (check ${TEST_NAME})
+    endfunction (add_test_executable)
+
+    add_test_executable (t-compile tests/t-compile.c)
+    add_test_executable (t-dirent tests/t-dirent.c)
+    add_test_executable (t-scandir tests/t-scandir.c)
+    add_test_executable (t-unicode tests/t-unicode.c)
+    add_test_executable (t-cplusplus tests/t-cplusplus.cpp)
+    add_test_executable (t-strverscmp tests/t-strverscmp.c)
+    add_test_executable (t-utf8 tests/t-utf8.c)
+endif(DIRENT_BUILD_TESTS)

cross_dirent/CONTRIBUTING.md

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+# Contributing to Dirent
+
+Dirent is an open source project and we love to receive contributions from our
+community -- you!  There are many ways to contribute, from writing tutorials
+or blog posts, improving the documentation, submitting bug reports and
+feature requests, or writing code which can be incorporated into Dirent.
+
+For example, we are looking for contributions which
+
+1. Improve portability of code developed for Unix/Linux to Microsoft Windows.
+2. Make Dirent easier to use and/or more useful for programmers working on
+   Microsoft Windows platform.
+3. Remove compiler warnings or fix bugs.
+
+## How to Suggest a Feature
+
+We use Github to host code, to track issues and to discuss about Dirent.  If
+you would like to suggest a feature, then open an issue at Github.
+
+## How to Report a Bug
+
+If you have trouble using Dirent, then try to repeat the problem with the
+latest version found at Github.  If the problem remains, then open an issue
+at Github.
+
+## How to Submit a Fix or an Enhancement
+
+If you wish to contribute code, then fork the repo and test the change in your
+private repo first.  If the change works for you and you would like to donate
+the change back to the community, then make a pull request at Github.
+
+Before making a pull request, please consider that:
+
+1. We can only accept contributions which are compatible with [MIT Software
+   License](LICENSE).
+2. By making a pull request, you agree to transfer all copyrights to us.
+3. Our code will be reviewed and edited by us.  In particular, we may
+   reformat your code according to the [Linux Kernel Coding
+   Style](https://www.kernel.org/doc/html/v4.10/process/coding-style.html)
+
+

cross_dirent/ChangeLog

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+2018-05-08  Toni Rönkkö
+
+	* Version 1.23.2: fixes bad scandir prototype.
+
+2017-08-27  Toni Rönkkö
+
+	* Version 1.23: support readdir_r and scandir functions.
+
+2017-07-18  Toni Rönkkö
+
+	* Created release branches v1.22 and v1.21 to Git.  Published version
+	1.22 at softagalleria.net.
+
+2016-09-11  Toni Rönkkö
+
+	* Version 1.22: added support for CMake.  Thanks to Paul Fultz II.
+
+2014-09-25  Toni Rönkkö
+
+	* Version 1.21: compiles correctly under Open Watcom.  Thanks to
+	Virgil Banowetz for a patch!
+
+2014-04-07  Toni Rönkkö
+
+	* Version 1.20.1: the zip file from the previous version did not open
+	correctly with Microsoft's compressed folders.  Thanks to Alexandre
+	for info!
+
+2014-03-17  Toni Ronkko
+
+	* Version 1.20: dirent.h compiles correctly in 64-bit architecture.
+	Thanks to Aaron Simmons!
+
+2014-03-03  Toni Ronkko
+
+	* Version 1.13.2: define DT_LNK for compatibility with Unix
+	programs.  Thanks to Joel Bruick for suggestion!
+
+2013-01-27  Toni Ronkko
+
+	* Version 1.13.1: patch from Edward Berner fixes set_errno() on
+	Windows NT 4.0.
+
+	* Revised wcstombs() and mbstowcs() wrappers to make sure that they do
+	not write past their target string.
+
+	* PATH_MAX from windows.h includes zero terminator so there is no
+	need to add one extra byte to variables and structures.
+
+2012-12-12  Toni Ronkko
+
+	* Version 1.13: use the traditional 8+3 file naming scheme if a file
+	name cannot be represented in the default ANSI code page.  Now
+	compiles again with MSVC 6.0.  Thanks to Konstantin Khomoutov for
+	testing.
+
+2012-10-01  Toni Ronkko
+
+	* Version 1.12.1: renamed wide-character DIR structure _wDIR to
+	_WDIR (with capital W) in order to maintain compatibility with MingW.
+
+2012-09-30  Toni Ronkko
+
+	* Version 1.12: define PATH_MAX and NAME_MAX.  Added wide-character
+	variants _wDIR, _wdirent, _wopendir(), _wreaddir(), _wclosedir() and
+	_wrewinddir().  Thanks to Edgar Buerkle and Jan Nijtmans for ideas
+	and code.
+
+	* Now avoiding windows.h.  This allows dirent.h to be integrated
+	more easily into programs using winsock.  Thanks to Fernando
+	Azaldegui.
+
+2011-03-15  Toni Ronkko
+
+	* Version 1.11: defined FILE_ATTRIBUTE_DEVICE for MSVC 6.0.
+
+2010-08-11  Toni Ronkko
+
+	* Version 1.10: added d_type and d_namlen fields to dirent structure.
+	The former is especially useful for determining whether directory
+	entry represents a file or a directory.  For more information, see
+	http://www.delorie.com/gnu/docs/glibc/libc_270.html
+
+	* Improved conformance to the standards.  For example, errno is now
+	set properly on failure and assert() is never used.  Thanks to Peter
+	Brockam for suggestions.
+
+	* Fixed a bug in rewinddir(): when using relative directory names,
+	change of working directory no longer causes rewinddir() to fail.
+
+2009-12-15  John Cunningham
+
+	* Version 1.9: added rewinddir member function
+
+2008-01-18  Toni Ronkko
+
+	* Version 1.8: Using FindFirstFileA and WIN32_FIND_DATAA to avoid
+	converting string between multi-byte and unicode representations.
+	This makes the code simpler and also allows the code to be compiled
+	under MingW.  Thanks to Azriel Fasten for the suggestion.
+
+2007-03-04  Toni Ronkko
+
+	* Bug fix: due to the strncpy_s() function this file only compiled in
+	Visual Studio 2005.  Using the new string functions only when the
+	compiler version allows.
+
+2006-11-02  Toni Ronkko
+
+	* Major update: removed support for Watcom C, MS-DOS and Turbo C to
+	simplify the file, updated the code to compile cleanly on Visual
+	Studio 2005 with both unicode and multi-byte character strings,
+	removed rewinddir() as it had a bug.
+
+2006-08-20  Toni Ronkko
+
+	* Removed all remarks about MSVC 1.0, which is antiqued now.
+	Simplified comments by removing SGML tags.
+
+2002-05-14  Toni Ronkko
+
+	* Embedded the function definitions directly to the header so that no
+	source modules need to be included in the Visual Studio project.
+	Removed all the dependencies to other projects so that this header
+	file can be used independently.
+
+1998-05-28  Toni Ronkko
+
+	* First version.

cross_dirent/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 1998-2019 Toni Ronkko
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.