include/boost/corosio/detail/make_err.hpp

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1		//
2		// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
3		// Copyright (c) 2026 Steve Gerbino
4		//
5		// Distributed under the Boost Software License, Version 1.0. (See accompanying
6		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7		//
8		// Official repository: https://github.com/cppalliance/corosio
9		//
10
11		#ifndef BOOST_COROSIO_DETAIL_MAKE_ERR_HPP
12		#define BOOST_COROSIO_DETAIL_MAKE_ERR_HPP
13
14		#include <boost/corosio/detail/config.hpp>
15		#include <boost/corosio/detail/platform.hpp>
16		#include <boost/capy/error.hpp>
17		#include <system_error>
18
19		#if BOOST_COROSIO_POSIX
20		#include <errno.h>
21		#else
22		#ifndef WIN32_LEAN_AND_MEAN
23		#define WIN32_LEAN_AND_MEAN
24		#endif
25		#include <Windows.h>
26		#endif
27
28		namespace boost::corosio::detail {
29
30		#if BOOST_COROSIO_POSIX
31
32		/** Convert a POSIX errno value to std::error_code.
33
34		Maps ECANCELED to capy::error::canceled.
35
36		@param errn The errno value.
37		@return The corresponding std::error_code.
38		*/
39		inline std::error_code
40	8	make_err(int errn) noexcept
41		{
42	8	if (errn == 0)
43	✗	return {};
44
45	8	if (errn == ECANCELED)
46	✗	return capy::error::canceled;
47
48	8	return std::error_code(errn, std::system_category());
49		}
50
51		#else
52
53		/** Convert a Windows error code to std::error_code.
54
55		Maps ERROR_OPERATION_ABORTED and ERROR_CANCELLED to capy::error::canceled.
56		Maps ERROR_HANDLE_EOF to capy::error::eof.
57
58		@param dwError The Windows error code (DWORD).
59		@return The corresponding std::error_code.
60		*/
61		inline std::error_code
62		make_err(unsigned long dwError) noexcept
63		{
64		if (dwError == 0)
65		return {};
66
67		if (dwError == ERROR_OPERATION_ABORTED \|\| dwError == ERROR_CANCELLED)
68		return capy::error::canceled;
69
70		if (dwError == ERROR_HANDLE_EOF)
71		return capy::error::eof;
72
73		return std::error_code(static_cast<int>(dwError), std::system_category());
74		}
75
76		#endif
77
78		} // namespace boost::corosio::detail
79
80		#endif
81