----------------------------------------------------------------------
Patch name: patch.example-override-ask
Author: Bryce Denney
Date: Mon Sep 23 13:00:53 EDT 2002
Status: Demo

Detailed description:
This patch shows how to create your own siminterface callback function.
It is not intended to be checked in anytime, only to serve as an example
of how to use the siminterface.

Patch updated for current SVN. (Volker Ruppert, Apr 15, 2012)

Patch was created with:
  diff -u
Apply patch to what version:
  svn checked out on DATE
Instructions:
  To patch, go to main bochs directory.
  Type "patch -p0 < THIS_PATCH_FILE".
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diff -urN ../bochs/config.h.in ./config.h.in
--- ../bochs/config.h.in	2012-01-26 17:34:41.603286662 +0100
+++ ./config.h.in	2012-04-15 14:29:36.529504219 +0200
@@ -858,6 +858,9 @@
 // I/O Interface to debugger
 #define BX_SUPPORT_IODEBUG 0
 
+// Override ask dialog (demo)
+#define BX_OVERRIDE_ASK_EXAMPLE 1
+
 #ifdef WIN32
 #define BX_FLOPPY0_NAME "Floppy Disk A:"
 #define BX_FLOPPY1_NAME "Floppy Disk B:"
diff -urN ../bochs/gui/textconfig.cc ./gui/textconfig.cc
--- ../bochs/gui/textconfig.cc	2012-04-06 15:15:28.094038820 +0200
+++ ./gui/textconfig.cc	2012-04-15 14:31:30.538122593 +0200
@@ -1075,6 +1075,10 @@
   {
     case CI_START:
       bx_config_interface_init();
+#if BX_OVERRIDE_ASK_EXAMPLE
+      extern void override_ask_init();
+      override_ask_init();
+#endif
       if (SIM->get_param_enum(BXPN_BOCHS_START)->get() == BX_QUICK_START)
 	bx_config_interface(BX_CI_START_SIMULATION);
       else {
diff -urN ../bochs/Makefile.in ./Makefile.in
--- ../bochs/Makefile.in	2012-04-11 18:52:41.715215121 +0200
+++ ./Makefile.in	2012-04-15 14:29:36.530504215 +0200
@@ -141,6 +141,7 @@
 	osdep.o \
 	plugin.o \
 	crc.o \
+	overrideask.o \
 	@EXTRA_BX_OBJS@
 
 EXTERN_ENVIRONMENT_OBJS = \
diff -urN ../bochs/overrideask.cc ./overrideask.cc
--- ../bochs/overrideask.cc	1970-01-01 01:00:00.000000000 +0100
+++ ./overrideask.cc	2012-04-15 14:29:36.531504211 +0200
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <assert.h>
+#include "config.h"
+#include "osdep.h"
+#include "gui/siminterface.h"
+
+bxevent_handler old_callback = NULL;
+void *old_callback_arg = NULL;
+
+BxEvent *
+override_ask_callback (void *unused, BxEvent *event)
+{
+  int n;
+  int level;
+  fprintf (stderr, "override_ask_callback\n");
+  event->retcode = -1;
+  switch (event->type)
+  {
+    case BX_SYNC_EVT_LOG_ASK:
+      level = event->u.logmsg.level;
+      fprintf (stderr, "============ override_ask_callback was called ==========================\n");
+      fprintf (stderr, "Event type: %s\n", SIM->get_log_level_name (level));
+      fprintf (stderr, "Device: %s\n", event->u.logmsg.prefix);
+      fprintf (stderr, "Message: %s\n\n", event->u.logmsg.msg);
+      // note: 4 only available if BX_DEBUGGER=1. ideally, don't show it
+      fprintf (stderr, "What should I do? (0=continue, 1=alwayscont, 2=die, 3=abort, 4=debug) ");
+      while (scanf ("%d", &n) != 1 || (n<0 && n>4)) {
+	fprintf (stderr, "Enter 0-4 only.\n");
+      }
+      event->retcode = n;
+      fprintf (stderr, "============ override_ask_callback is done =============================\n");
+      return event;
+    case BX_SYNC_EVT_TICK: // called periodically by siminterface.
+    case BX_SYNC_EVT_ASK_PARAM: // called if simulator needs to know value of a param.
+    case BX_ASYNC_EVT_REFRESH: // called when some bx_param_c parameters have changed.
+      // fall into default case
+  default:
+    return (*old_callback)(old_callback_arg, event);
+  }
+}
+
+// called from textconfig.cc
+void override_ask_init ()
+{
+  fprintf (stderr, "override_ask_init");
+  // this should be called after the configuration interface has had a
+  // chance to install its own callback.  Otherwise, overrideask will not
+  // override anything.
+  SIM->get_notify_callback (&old_callback, &old_callback_arg);
+  assert (old_callback != NULL);
+  SIM->set_notify_callback (override_ask_callback, NULL);
+}