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