74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/*
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* Copyright 2022 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "FmtError.hxx"
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#include <fmt/format.h>
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#include <array>
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std::system_error
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VFmtSystemError(std::error_code code,
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fmt::string_view format_str, fmt::format_args args) noexcept
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{
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std::array<char, 512> buffer;
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auto [p, _] = fmt::vformat_to_n(buffer.begin(), buffer.size() - 1,
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format_str, args);
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*p = 0;
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return std::system_error{code, buffer.data()};
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}
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#ifdef _WIN32
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#include <windef.h> // for HWND (needed by winbase.h)
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#include <winbase.h> // for FormatMessageA()
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std::system_error
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VFmtLastError(DWORD code,
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fmt::string_view format_str, fmt::format_args args) noexcept
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{
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std::array<char, 512> buffer;
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const auto end = buffer.data() + buffer.size();
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constexpr std::size_t max_prefix = sizeof(buffer) - 128;
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auto [p, _] = fmt::vformat_to_n(buffer.data(),
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buffer.size() - max_prefix,
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format_str, args);
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*p++ = ':';
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*p++ = ' ';
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FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr, code, 0, p, end - p, nullptr);
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return MakeLastError(code, buffer.data());
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}
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#endif // _WIN32
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