[readline-mingw] backspace key and TUI size

[Denis PILAT <denis.pilat@st.com>]

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Hi,

When compiling gdb 6.4 for native window host (minGW) I get a gdb.exe 
and a gdbtui.exe where there were 2 problems.
- In the gdbtui.exe version, the TUI interface do not fit in the DOS 
command window.
- In the gdb.exe version, the backspace key do not behave correctly.

I did some little modification in readline to fix both problems. I 
attach the patch applied.
I've already submitted it to Chet Ramey (the readline maintainer at 
bash-maintainers@gnu.org) who accepted it.
I don't know the gdb policy with readline synchronization, but I would 
like it  to be integrated as well in gdb distribution.

Denis

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Index: readline/terminal.c
===================================================================
--- readline/terminal.c	(revision 328)
+++ readline/terminal.c	(working copy)
@@ -70,6 +70,11 @@
 #include "rlshell.h"
 #include "xmalloc.h"
 
+#if defined (__MINGW32__)
+#  include <windows.h>
+#  include <wincon.h>
+#endif
+
 #define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
 #define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)
 
@@ -201,6 +206,15 @@
   struct winsize window_size;
 #endif /* TIOCGWINSZ */
 
+/* For mingw version, we get console size from windows API*/
+#if defined (__MINGW32__)
+  HANDLE hConOut = GetStdHandle(STD_OUTPUT_HANDLE);
+  CONSOLE_SCREEN_BUFFER_INFO scr;  
+  GetConsoleScreenBufferInfo(hConOut, &scr);
+  _rl_screenwidth = scr.dwSize.X;
+  _rl_screenheight = scr.srWindow.Bottom - scr.srWindow.Top + 1;
+#endif
+
 #if defined (TIOCGWINSZ)
   if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
     {
@@ -299,6 +313,7 @@
 void
 rl_resize_terminal ()
 {
+printf("rl_resize_terminal\n");
   if (readline_echoing_p)
     {
       _rl_get_screen_size (fileno (rl_instream), 1);
@@ -593,8 +608,8 @@
 {
   register int i;
 
-#ifndef __MSDOS__
-  if (_rl_term_backspace)
+#if !defined (__MSDOS__) && !defined (__MINGW32__)
+  if (_rl_term_backspace) 
     for (i = 0; i < count; i++)
       tputs (_rl_term_backspace, 1, _rl_output_character_function);
   else