forked from dolphin-emu/dolphin
bd5da5cfd6
Trying to force the XSI version by undefining _GNU_SOURCE can lead to compilation errors on some systems because of headers expecting that _GNU_SOURCE is defined. This commit uses define checks to detect which version we have. I tried making an overloaded function (int and const char*) instead, but that led to a warning about one of the variants being unused.
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// Copyright 2009 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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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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#include "Common/CommonFuncs.h"
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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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#endif
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constexpr size_t BUFFER_SIZE = 256;
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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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// 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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// We check defines in order to figure out variant is in use, and we store the returned value
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// to a variable so that we'll get a compile-time check that our assumption was correct.
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#if defined(__GLIBC__) && (_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
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const char* str = strerror_r(errno, error_message, BUFFER_SIZE);
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return std::string(str);
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#else
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int error_code = strerror_r(errno, error_message, BUFFER_SIZE);
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return error_code == 0 ? std::string(error_message) : "";
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#endif
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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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char error_message[BUFFER_SIZE];
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FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), error_message, BUFFER_SIZE, nullptr);
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return std::string(error_message);
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}
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#endif
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