}
/*
+ * Message box with optional context help.
+ */
+
+/* Callback function to launch context help. */
+static VOID CALLBACK message_box_help_callback(LPHELPINFO lpHelpInfo)
+{
+ if (help_path) {
+ char *context = NULL;
+#define CHECK_CTX(name) \
+ do { \
+ if (lpHelpInfo->dwContextId == WINHELP_CTXID_ ## name) \
+ context = WINHELP_CTX_ ## name; \
+ } while (0)
+ CHECK_CTX(errors_hostkey_absent);
+ CHECK_CTX(errors_hostkey_changed);
+#undef CHECK_CTX
+ if (context) {
+ /* We avoid using malloc, in case we're in a situation where
+ * it would be awkward to do so. */
+ char cmd[WINHELP_CTX_MAXLEN+10];
+ sprintf(cmd, "JI(`',`%.*s')", WINHELP_CTX_MAXLEN, context);
+ WinHelp(hwnd, help_path, HELP_COMMAND, (DWORD)cmd);
+ requested_help = TRUE;
+ }
+ }
+}
+
+int message_box(LPCTSTR text, LPCTSTR caption, DWORD style, DWORD helpctxid)
+{
+ MSGBOXPARAMS mbox;
+
+ /*
+ * We use MessageBoxIndirect() because it allows us to specify a
+ * callback function for the Help button.
+ */
+ mbox.cbSize = sizeof(mbox);
+ /* FIXME: assumes global hwnd and hinst are always the Right Thing;
+ * are they? */
+ mbox.hInstance = hinst;
+ mbox.hwndOwner = hwnd;
+ mbox.lpfnMsgBoxCallback = &message_box_help_callback;
+ mbox.dwLanguageId = LANG_NEUTRAL;
+ mbox.lpszText = text;
+ mbox.lpszCaption = caption;
+ mbox.dwContextHelpId = helpctxid;
+ mbox.dwStyle = style;
+ if (helpctxid != 0 && help_path) mbox.dwStyle |= MB_HELP;
+ return MessageBoxIndirect(&mbox);
+}
+
+/*
* Split a complete command line into argc/argv, attempting to do
* it exactly the same way Windows itself would do it (so that
* console utilities, which receive argc and argv from Windows,