[PATCH]: Fix gdb secondary prompts in TUI

[Stephane Carrez <stcarrez at nerim dot fr>]

Hi!

As reported by Ton van Overbeek in [PATCH]: TUI, secondary prompts do not work
http://sources.redhat.com/ml/gdb-patches/2002-10/msg00000.html
the gdb secondary prompts are never printed in TUI mode.

They used to be printed correctly in the past by readline itself.
But since I introduced the use of rl_startup_hook()/rl_already_prompted to avoid
to have readline to write directly on the rl_outstream, the TUI must now obtain
the good prompt and print it correctly.

This must be done by saving the rl_prompt when readline configures itself
(tui_prep_terminal is a good place for that), and using that prompt when we
redisplay the readline buffer.

I committed this patch on 5_3-branch and mainline.

	Stephane

2002-10-26  Stephane Carrez  <stcarrez@nerim.fr>

	* tuiIO.c (tui_prep_terminal): Save the prompt registered in readline.
	(tui_redisplay_readline): Use the last saved prompt.
	(tui_rl_saved_prompt): New.
Index: tuiIO.c
===================================================================
RCS file: /cvs/src/src/gdb/tui/tuiIO.c,v
retrieving revision 1.15.2.4
diff -u -p -r1.15.2.4 tuiIO.c
--- tuiIO.c	25 Oct 2002 19:24:29 -0000	1.15.2.4
+++ tuiIO.c	26 Oct 2002 10:01:56 -0000
@@ -124,6 +124,10 @@ static FILE *tui_old_rl_outstream;
 static int tui_readline_pipe[2];
 #endif
 
+/* The last gdb prompt that was registered in readline.
+   This may be the main gdb prompt or a secondary prompt.  */
+static char *tui_rl_saved_prompt;
+
 static unsigned int _tuiHandleResizeDuringIO (unsigned int);
 
 static void
@@ -194,7 +198,7 @@ tui_redisplay_readline (void)
   if (tui_current_key_mode == tui_single_key_mode)
     prompt = "";
   else
-    prompt = get_prompt ();
+    prompt = tui_rl_saved_prompt;
   
   c_pos = -1;
   c_line = -1;
@@ -256,10 +260,15 @@ tui_redisplay_readline (void)
 }
 
 /* Readline callback to prepare the terminal.  It is called once
-   each time we enter readline.  There is nothing to do in curses mode.  */
+   each time we enter readline.  Terminal is already setup in curses mode.  */
 static void
 tui_prep_terminal (void)
 {
+  /* Save the prompt registered in readline to correctly display it.
+     (we can't use gdb_prompt() due to secondary prompts and can't use
+     rl_prompt because it points to an alloca buffer).  */
+  xfree (tui_rl_saved_prompt);
+  tui_rl_saved_prompt = xstrdup (rl_prompt);
 }
 
 /* Readline callback to restore the terminal.  It is called once