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common/misc: Deduplicate code in GetLastErrorMsg()

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Android and macOS have supported thread_local for quite a while, but
most importantly is that we don't even really need it. Instead of using
a thread-local buffer, we can just return a non-static buffer as a
std::string, avoiding the need for that quality entirely.
This commit is contained in:
Lioncash 2018-07-19 09:03:30 -04:00
parent cd4fca8447
commit e0b8a35937
2 changed files with 8 additions and 12 deletions
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4
src/common/common_funcs.h
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@ -4,6 +4,8 @@
#pragma once
#include <string>
#if !defined(ARCHITECTURE_x86_64) && !defined(ARCHITECTURE_ARM)
#include <cstdlib> // for exit
#endif
@ -90,7 +92,7 @@ __declspec(dllimport) void __stdcall DebugBreak(void);
// Call directly after the command or use the error num.
// This function might change the error code.
// Defined in Misc.cpp.
const char* GetLastErrorMsg();
std::string GetLastErrorMsg();
namespace Common {

16
src/common/misc.cpp
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@ -4,34 +4,28 @@
#include <cstddef>
#ifdef _WIN32
#include <windows.h>
#include <Windows.h>
#else
#include <cerrno>
#include <cstring>
#endif
// Neither Android nor OS X support TLS
#if defined(__APPLE__) || (ANDROID && __clang__)
#define __thread
#endif
#include "common/common_funcs.h"
// Generic function to get last error message.
// Call directly after the command or use the error num.
// This function might change the error code.
const char* GetLastErrorMsg() {
std::string GetLastErrorMsg() {
static const size_t buff_size = 255;
char err_str[buff_size];
#ifdef _WIN32
static __declspec(thread) char err_str[buff_size] = {};
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), err_str, buff_size, nullptr);
#else
static __thread char err_str[buff_size] = {};
// Thread safe (XSI-compliant)
strerror_r(errno, err_str, buff_size);
#endif
return err_str;
return std::string(err_str, buff_size);
}