[RFA] windows-nat.c: Copy console information for new console

["Pierre Muller" <pierre.muller@ics-cnrs.unistra.fr>]

  Using 
(gdb) set new-console on
on Windows native is nice for some features but is
also terribly annoying sometimes.
  Especially on nice big displays, because
the newly created console is 25 lines times 80 columns 
by default which is really not much when you usually work on
60 or more lines.
  This patch copies the values of the current console
(if it exists) and uses the same parameters to start
the new-console. I copied both the window and the buffer
size (having a long buffer allows to see history of output...).

  I did, on purpose not set the same position for the new
console, which results in a usual shift to the left and down
avoid a complete overlap of the windows.

  This make using new-console much easier to use.
A possible extension would be to be able to 
specify these parameters with something like
(gdb) set w32 console lines 45
  There is apparently no way to specify the
font. This might lead to windows size that are not optimal
for the buffer size used, and it is calculated on the current 
console font which might not be the default font. But I don't know
how to find out what the default font is.
  I tested this patch on Windows XP and on
Windows 2008 64-bit run mingw64 GDB.
 

Pierre Muller
Pascal language support maintainer for GDB

2010-05-21  Pierre Muller  <muller@ics.u-strasbg.fr>

	* windows-nat.c (GetConsoleFontSize, GetCurrentConsoleFont):
	New macros.
	(windows_create_inferior): Copy current console information
	into SI structure if on a console if new-console is on.
	(bad_GetCurrentConsoleFont, bad_GetConsoleFontSize): New functions.
	(_initialize_loadable): Initialize GetConsoleFontSize and
	GetCurrentConsoleFont.

Index: windows-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/windows-nat.c,v
retrieving revision 1.208
diff -u -p -r1.208 windows-nat.c
--- windows-nat.c	16 Apr 2010 07:49:35 -0000	1.208
+++ windows-nat.c	21 May 2010 21:04:16 -0000
@@ -75,6 +75,8 @@
 #define GetModuleInformation		dyn_GetModuleInformation
 #define LookupPrivilegeValueA		dyn_LookupPrivilegeValueA
 #define OpenProcessToken		dyn_OpenProcessToken
+#define GetConsoleFontSize		dyn_GetConsoleFontSize
+#define GetCurrentConsoleFont		dyn_GetCurrentConsoleFont
 
 static BOOL WINAPI (*AdjustTokenPrivileges)(HANDLE, BOOL,
PTOKEN_PRIVILEGES,
 					    DWORD, PTOKEN_PRIVILEGES,
PDWORD);
@@ -87,7 +89,8 @@ static BOOL WINAPI (*GetModuleInformatio
 					    DWORD);
 static BOOL WINAPI (*LookupPrivilegeValueA)(LPCSTR, LPCSTR, PLUID);
 static BOOL WINAPI (*OpenProcessToken)(HANDLE, DWORD, PHANDLE);
-
+static BOOL WINAPI (*GetCurrentConsoleFont) (HANDLE, BOOL,
CONSOLE_FONT_INFO *);
+static COORD WINAPI (*GetConsoleFontSize) (HANDLE, DWORD);
 static struct target_ops windows_ops;
 
 #undef STARTUPINFO
@@ -1933,7 +1940,39 @@ windows_create_inferior (struct target_o
     flags |= CREATE_NEW_PROCESS_GROUP;
 
   if (new_console)
-    flags |= CREATE_NEW_CONSOLE;
+    {
+      HANDLE hconsole = CreateFile ("CONOUT$", GENERIC_READ |
GENERIC_WRITE,
+				    FILE_SHARE_READ, NULL, OPEN_EXISTING, 0,
0);
+
+      /* If we are on a console, try to copy the parameters of that console
+	 to create the new console.
+	 The size of the used font is not available on all versions of
+	 Windows OS.  Furthermore, the current font might not be the default
+	 font, but this is still better than before.  */
+      if (hconsole != INVALID_HANDLE_VALUE)
+	{
+	  CONSOLE_SCREEN_BUFFER_INFO sbinfo;
+	  COORD font_size;
+	  CONSOLE_FONT_INFO cfi;
+	  GetCurrentConsoleFont (hconsole, FALSE, &cfi);
+	  font_size = GetConsoleFontSize (hconsole, cfi.nFont);
+	  GetConsoleScreenBufferInfo(hconsole, &sbinfo);
+	  si.dwXSize = sbinfo.srWindow.Right - sbinfo.srWindow.Left + 1;
+	  si.dwYSize = sbinfo.srWindow.Bottom - sbinfo.srWindow.Top + 1;
+	  if (font_size.X)
+	    si.dwXSize *= font_size.X;
+	  else
+	    si.dwXSize *= 8;
+	  if (font_size.Y)
+	    si.dwYSize *= font_size.Y;
+	  else
+	    si.dwYSize *= 12;
+	  si.dwXCountChars = sbinfo.dwSize.X;
+	  si.dwYCountChars = sbinfo.dwSize.Y;
+	  si.dwFlags |= STARTF_USESIZE | STARTF_USECOUNTCHARS;
+	}
+      flags |= CREATE_NEW_CONSOLE;
+    }
 
 #ifdef __CYGWIN__
   if (!useshell)
@@ -2570,6 +2609,21 @@ bad_OpenProcessToken (HANDLE w, DWORD x,
   return FALSE;
 }
 
+static BOOL WINAPI
+bad_GetCurrentConsoleFont (HANDLE w, BOOL bMaxWindow, CONSOLE_FONT_INFO *f)
+{
+  f->nFont = 0;
+  return 1;
+}
+static COORD WINAPI
+bad_GetConsoleFontSize (HANDLE w, DWORD nFont)
+{
+  COORD size;
+  size.X = 8;
+  size.Y = 12;
+  return size;
+}
+ 
 /* Load any functions which may not be available in ancient versions
    of Windows. */
 void
@@ -2586,6 +2640,10 @@ _initialize_loadable (void)
 	GetProcAddress (hm, "DebugBreakProcess");
       DebugSetProcessKillOnExit = (void *)
 	GetProcAddress (hm, "DebugSetProcessKillOnExit");
+      GetConsoleFontSize = (void *) 
+	GetProcAddress (hm, "GetConsoleFontSize");
+      GetCurrentConsoleFont = (void *) 
+	GetProcAddress (hm, "GetCurrentConsoleFont");
     }
 
   /* Set variables to dummy versions of these processes if the function
@@ -2597,6 +2655,10 @@ _initialize_loadable (void)
       DebugActiveProcessStop = bad_DebugActiveProcessStop;
       DebugSetProcessKillOnExit = bad_DebugSetProcessKillOnExit;
     }
+  if (!GetConsoleFontSize)
+    GetConsoleFontSize = bad_GetConsoleFontSize;
+  if (!GetCurrentConsoleFont)
+    GetCurrentConsoleFont = bad_GetCurrentConsoleFont;
 
   /* Load optional functions used for retrieving filename information
      associated with the currently debugged process or its dlls. */