dolphin/Source/Core/Common/CommonFuncs.cpp

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// Copyright 2009 Dolphin Emulator Project
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// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstddef>
#include <cstring>
#include <errno.h>
#include <type_traits>
#include "Common/CommonFuncs.h"
#ifdef _WIN32
#include <windows.h>
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#define strerror_r(err, buf, len) strerror_s(buf, len, err)
#endif
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constexpr size_t BUFFER_SIZE = 256;
// Wrapper function to get last strerror(errno) string.
// This function might change the error code.
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std::string LastStrerrorString()
{
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char error_message[BUFFER_SIZE];
// 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.
// We check defines in order to figure out variant is in use, and we store the returned value
// to a variable so that we'll get a compile-time check that our assumption was correct.
#if (defined(__GLIBC__) || __ANDROID_API__ >= 23) && \
(_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
const char* str = strerror_r(errno, error_message, BUFFER_SIZE);
return std::string(str);
#else
int error_code = strerror_r(errno, error_message, BUFFER_SIZE);
return error_code == 0 ? std::string(error_message) : "";
#endif
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}
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#ifdef _WIN32
// Wrapper function to get GetLastError() string.
// This function might change the error code.
std::string GetLastErrorString()
{
char error_message[BUFFER_SIZE];
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), error_message, BUFFER_SIZE, nullptr);
return std::string(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;
}
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#endif