Adding modding folder with a hacked build.

modding/hacked/crash/Handler.go

@@ -0,0 +1,4 @@
+package crash
+
+// Handler is a function that tries to preserve some panic/stack info to the user.
+var Handler = func(versionInfo string) {}

modding/hacked/crash/Handler_windows.go

@@ -0,0 +1,42 @@
+package crash
+
+//#include <windows.h>
+import "C"
+import (
+	"fmt"
+	"runtime/debug"
+	"unsafe"
+)
+
+func init() {
+	Handler = windowsHandler
+}
+
+func windowsHandler(versionInfo string) {
+	if e := recover(); e != nil {
+		text := `There was a crash in the application. This is bad and I am sorry.
+
+Perhaps you can make something with the details of the error below.
+If you can reproduce this, please make a screenshot of this box and report it with details on the http://www.systemshock.org forums.
+Thank you!
+
+`
+		text += fmt.Sprintf("%s:\n%s", e, debug.Stack())
+		messageBox(text, "Something unexpected happened - "+versionInfo)
+	}
+}
+
+func messageBox(text, caption string) {
+	textArg, textFin := wrapString(text)
+	defer textFin()
+	captionArg, captionFin := wrapString(caption)
+	defer captionFin()
+	var hwnd unsafe.Pointer
+	C.MessageBoxExA((*C.struct_HWND__)(hwnd), textArg, captionArg, C.UINT(0), C.WORD(0))
+}
+
+func wrapString(value string) (wrapped *C.char, finisher func()) {
+	wrapped = C.CString(value)
+	finisher = func() { C.free(unsafe.Pointer(wrapped)) } // nolint: gas
+	return
+}