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96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
// Copyright 2009 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/CommonFuncs.h"
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#include <cstddef>
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#include <cstring>
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#include <errno.h>
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#include <type_traits>
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#ifdef _WIN32
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#include <windows.h>
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#define strerror_r(err, buf, len) strerror_s(buf, len, err)
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#include "Common/StringUtil.h"
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#endif
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namespace Common
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{
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constexpr size_t BUFFER_SIZE = 256;
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// There are two variants of strerror_r. The XSI version stores the message to the passed-in
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// buffer and returns an int (0 on success). The GNU version returns a pointer to the message,
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// which might have been stored in the passed-in buffer or might be a static string.
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//
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// This function might change the errno value.
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//
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// References:
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// https://www.gnu.org/software/gnulib/manual/html_node/strerror_005fr.html
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/strerror_r.html
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// https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-strerror-r.html
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const char* StrErrorWrapper(int error, char* buffer, std::size_t length)
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{
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// We check defines in order to figure out which variant is in use.
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#if (defined(__GLIBC__) || __ANDROID_API__ >= 23) && \
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(_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
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return strerror_r(error, buffer, length);
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#else
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const int error_code = strerror_r(error, buffer, length);
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return error_code == 0 ? buffer : "";
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#endif
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}
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// Wrapper function to get last strerror(errno) string.
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// This function might change the error code.
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std::string LastStrerrorString()
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{
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char error_message[BUFFER_SIZE];
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return StrErrorWrapper(errno, error_message, BUFFER_SIZE);
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}
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#ifdef _WIN32
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// Wrapper function to get GetLastError() string.
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// This function might change the error code.
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std::string GetLastErrorString()
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{
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return GetWin32ErrorString(GetLastError());
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}
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// Like GetLastErrorString() but if you have already queried the error code.
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std::string GetWin32ErrorString(DWORD error_code)
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{
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wchar_t error_message[BUFFER_SIZE];
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FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), error_message, BUFFER_SIZE, nullptr);
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return WStringToUTF8(error_message);
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}
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// Obtains a full path to the specified module.
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std::optional<std::wstring> GetModuleName(void* hInstance)
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{
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DWORD max_size = 50; // Start with space for 50 characters and grow if needed
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std::wstring name(max_size, L'\0');
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DWORD size;
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while ((size = GetModuleFileNameW(static_cast<HMODULE>(hInstance), name.data(), max_size)) ==
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max_size &&
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GetLastError() == ERROR_INSUFFICIENT_BUFFER)
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{
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max_size *= 2;
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name.resize(max_size);
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}
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if (size == 0)
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{
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return std::nullopt;
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}
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name.resize(size);
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return name;
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}
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#endif
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} // namespace Common
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