Move the MessageBox-with-help function out into winutils.c, although it's

[PuTTY.git] / windows / winutils.c

diff --git a/windows/winutils.c b/windows/winutils.c
index 2e91d8bb3a130738e678cb817cee4833ab982593..5bead7b206c075b9477061d5b25f39f211bcb191 100644 (file)
--- a/windows/winutils.c
+++ b/windows/winutils.c
@@ -88,6 +88,57 @@ void filereq_free(filereq *state)
     sfree(state);
 }
 
+/*
+ * 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