From 58d30975f0d46dc7812b7266c3c2c823695503e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sun, 31 Jul 2022 00:38:17 +0200
Subject: Simplify exception handling.

---
 c/common.cpp |  8 ++++++++
 c/common.h   |  1 +
 c/main.cpp   | 36 +++++++++++++++++-------------------
 3 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/c/common.cpp b/c/common.cpp
index 77d669c..7ce1372 100644
--- a/c/common.cpp
+++ b/c/common.cpp
@@ -55,6 +55,14 @@ wstring_owner WsoFromSz(const char* const sz, const int iCp)
 	return wsz;
 }
 
+wstring_owner WsoCopy(const wchar_t* const src)
+{
+	const int cb = wcslen(src)+1;
+	wchar_t* dst = new wchar_t[cb];
+	memcpy(dst, src, cb*sizeof(wchar_t));
+	return dst;
+}
+
 /* Win32Error: Exception for Windows API errors. */
 
 Win32Error::Win32Error() : dwErr(GetLastError()) {}
diff --git a/c/common.h b/c/common.h
index 8e850ed..e63095b 100644
--- a/c/common.h
+++ b/c/common.h
@@ -28,6 +28,7 @@ struct wstring_owner
 
 wstring_owner WsoFromSz(const char* sz, int iCp = CP_UTF8);
 int EBMessageBox(const wchar_t* wszText, const wchar_t* wszCaption, unsigned uType);
+wstring_owner WsoCopy(const wchar_t* wsz);
 
 struct Win32Error : public std::exception
 {
diff --git a/c/main.cpp b/c/main.cpp
index 144d151..7af5a0b 100644
--- a/c/main.cpp
+++ b/c/main.cpp
@@ -44,32 +44,30 @@ static void WaitFor(const char*, const char*);
 static INT_PTR CALLBACK AboutDlgProc(HWND, UINT, WPARAM, LPARAM);
 static void UpdateTheme();
 
-void TerminateMsg(const wchar_t* wsz1, const wchar_t* wsz2) noexcept
-{
-	wchar_t wsz[256] = {0};
-	if (wsz2)
-		wszf(wsz, L"Episode Browser was terminated due to %s: %s", wsz1, wsz2);
-	else
-		wszf(wsz, L"Episode Browser was terminated due to %s.", wsz1);
-	MessageBox(g_hWnd, wsz, L"Fatal Error", MB_ICONERROR);
-}
-
 void OnTerminate() noexcept
 {
+	const wchar_t* wszWhat = L"an exception";
+	wstring_owner wsoWhy;
+
 	try {
 		std::rethrow_exception(std::current_exception());
         } catch (const term_t& t) {
-		if (auto wso = PlString(t))
-			TerminateMsg(L"a Prolog exception", wso.p);
-		else
-			TerminateMsg(L"a Prolog exception", NULL);
+		wszWhat = L"a Prolog exception";
+		try { wsoWhy = PlString(t); } catch (...) {}
 	} catch (const Win32Error& e) {
-		TerminateMsg(L"a Windows error", e.WhatW());
+		wszWhat = L"a Windows error";
+		try { wsoWhy = WsoCopy(e.WhatW()); } catch (...) {}
 	} catch (const std::exception& e) {
-		TerminateMsg(L"an exception", WsoFromSz(e.what()).p);
-	} catch (...) {
-		TerminateMsg(L"an exception", NULL);
-	}
+		try { wsoWhy = WsoFromSz(e.what()); } catch (...) {}
+	} catch (...) {}
+
+	wchar_t wsz[256] = {0};
+	if (wsoWhy)
+		wszf(wsz, L"Episode Browser was terminated due to %s: %s", wszWhat, wsoWhy.p);
+	else
+		wszf(wsz, L"Episode Browser was terminated due to %s.", wszWhat);
+
+	MessageBox(g_hWnd, wsz, L"Fatal Error", MB_ICONERROR);
 	_Exit(1);
 }
 
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