[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/misc/crtmbox.cpp

@@ -0,0 +1,94 @@
+/***
+*crtmbox.c - CRT MessageBoxA wrapper.
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       Wrap MessageBoxA.
+*
+*******************************************************************************/
+
+#include <corecrt_internal.h>
+#include <corecrt_internal_traits.h>
+
+
+
+namespace
+{
+    template <typename Character>
+    struct message_box_arguments
+    {
+        Character const* _caption;
+        Character const* _text;
+        unsigned int     _type;
+        int              _result;
+    };
+}
+
+template <typename Character>
+static int __cdecl common_show_message_box(
+    Character const* const text,
+    Character const* const caption,
+    unsigned         const type
+    ) throw()
+{
+    using traits = __crt_char_traits<Character>;
+
+    bool const debugger_attached = IsDebuggerPresent();
+    if (debugger_attached)
+    {
+        // Output the message to the attached debugger.  This is useful when
+        // remotely debugging.
+        if (text)
+        {
+            traits::output_debug_string(text);
+        }
+
+        // We do not want to display a message box if a debugger
+        // is already attached, unless it's a desktop app.
+        // Instead, let the caller know that we want to
+        // directly break into the debugger:
+        bool const is_desktop_app = __acrt_get_windowing_model_policy() == windowing_model_policy_hwnd;
+        if (!is_desktop_app)
+        {
+            return IDRETRY; // Retry = Break into the debugger
+        }
+    }
+
+    bool const show_ui = __acrt_get_developer_information_policy() == developer_information_policy_ui;
+    if (!show_ui || !__acrt_can_show_message_box())
+    {
+        // If we can't get the message box pointers (perhaps because running on CoreSys),
+        // just abort, unless a debugger is attached--then break into the debugger instead.
+        // The message string was already output to the debugger above.
+        return debugger_attached ? IDRETRY : IDABORT;
+    }
+
+    // If the current process isn't attached to a visible window station (e.g.
+    // a non-interactive service), then we need to set the MB_SERVICE_NOTIFICATION
+    // flag, otherwise the message box will be invisible, stalling the program.
+    if (!__acrt_is_interactive())
+    {
+        return traits::message_box(nullptr, text, caption, type | MB_SERVICE_NOTIFICATION);
+    }
+
+    return traits::message_box(__acrt_get_parent_window(), text, caption, type);
+}
+
+extern "C" int __cdecl __acrt_show_narrow_message_box(
+    char const* const text,
+    char const* const caption,
+    unsigned    const type
+    )
+{
+    return common_show_message_box(text, caption, type);
+}
+
+extern "C" int __cdecl __acrt_show_wide_message_box(
+    wchar_t const* const text,
+    wchar_t const* const caption,
+    unsigned       const type
+    )
+{
+    return common_show_message_box(text, caption, type);
+}