From 7302bb4484d517a72cdffbd13ec7a9f2324cde01 Mon Sep 17 00:00:00 2001
From: Daniel Wilhelm <shieldwed@outlook.com>
Date: Sat, 29 Oct 2016 11:41:53 +0200
Subject: 8.6

---
 zen/sys_error.h | 48 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 8 deletions(-)

(limited to 'zen/sys_error.h')

diff --git a/zen/sys_error.h b/zen/sys_error.h
index 5897b413..4798b959 100644
--- a/zen/sys_error.h
+++ b/zen/sys_error.h
@@ -13,8 +13,8 @@
 #include "scope_guard.h"
 
 #ifdef ZEN_WIN
-    #include "win.h" //includes "windows.h"
-
+    #include "win.h" //tame WinINet.h include
+    #include <WinINet.h>
 #elif defined ZEN_LINUX || defined ZEN_MAC
     #include <cstring>
     #include <cerrno>
@@ -50,6 +50,22 @@ private:
 
 
 
+#ifdef _MSC_VER
+#define THROW_LAST_SYS_ERROR(functionName)                           \
+    do                                                               \
+    {                                                                \
+        const ErrorCode ecInternal = getLastError();                 \
+        throw SysError(formatSystemError(functionName, ecInternal)); \
+        \
+        __pragma(warning(suppress: 4127)) /*"conditional expression is constant"*/ \
+    } while (false)
+
+#else //same thing witout "__pragma":
+#define THROW_LAST_SYS_ERROR(functionName)                           \
+    do { const ErrorCode ecInternal = getLastError(); throw SysError(formatSystemError(functionName, ecInternal)); } while (false)
+#endif
+
+
 
 
 
@@ -78,10 +94,26 @@ std::wstring formatSystemErrorRaw(ErrorCode ec) //return empty string on error
     ZEN_ON_SCOPE_EXIT(::SetLastError(currentError)); //this function must not change active system error variable!
 
     LPWSTR buffer = nullptr;
-    if (::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM    |
-                        FORMAT_MESSAGE_MAX_WIDTH_MASK |
-                        FORMAT_MESSAGE_IGNORE_INSERTS | //important: without this flag ::FormatMessage() will fail if message contains placeholders
-                        FORMAT_MESSAGE_ALLOCATE_BUFFER, nullptr, ec, 0, reinterpret_cast<LPWSTR>(&buffer), 0, nullptr) != 0)
+    const DWORD rv = [&]
+    {
+        if (INTERNET_ERROR_BASE <= ec && ec <= INTERNET_ERROR_LAST)
+            return ::FormatMessage(FORMAT_MESSAGE_FROM_HMODULE   |
+            FORMAT_MESSAGE_MAX_WIDTH_MASK |
+            FORMAT_MESSAGE_IGNORE_INSERTS |
+            FORMAT_MESSAGE_ALLOCATE_BUFFER, ::GetModuleHandle(L"WinINet.dll"), ec, 0, reinterpret_cast<LPWSTR>(&buffer), 0, nullptr);
+        else
+            return ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM    |
+            FORMAT_MESSAGE_MAX_WIDTH_MASK |
+            FORMAT_MESSAGE_IGNORE_INSERTS | //important: without this flag ::FormatMessage() will fail if message contains placeholders
+            FORMAT_MESSAGE_ALLOCATE_BUFFER, //_In_     DWORD   dwFlags,
+            nullptr,        //_In_opt_ LPCVOID lpSource,
+            ec,             //_In_     DWORD   dwMessageId,
+            0,              //_In_     DWORD   dwLanguageId,
+            reinterpret_cast<LPWSTR>(&buffer), //_Out_    LPTSTR  lpBuffer,
+            0,              //_In_     DWORD   nSize,
+            nullptr);       //_In_opt_ va_list *Arguments
+    }();
+    if (rv  != 0)
         if (buffer) //"don't trust nobody"
         {
             ZEN_ON_SCOPE_EXIT(::LocalFree(buffer));
@@ -102,9 +134,9 @@ std::wstring formatSystemErrorRaw(ErrorCode ec) //return empty string on error
 std::wstring formatSystemError(const std::wstring& functionName, long long lastError) = delete; //intentional overload ambiguity to catch usage errors with HRESULT!
 
 inline
-std::wstring formatSystemError(const std::wstring& functionName, ErrorCode ec) 
+std::wstring formatSystemError(const std::wstring& functionName, ErrorCode ec)
 {
-	return formatSystemError(functionName, numberTo<std::wstring>(ec), formatSystemErrorRaw(ec)); 
+    return formatSystemError(functionName, numberTo<std::wstring>(ec), formatSystemErrorRaw(ec));
 }
 
 
-- 
cgit