Fix the MSDOS build when running under CWSDPMI

* src/msdos.c (the_only_tty_output): Define.
* src/msdos.h (the_only_tty_output): Declare.
* src/frame.c (make_terminal_frame) [MSDOS]:
* src/dispnew.c (init_display) [MSDOS]: Set up
f->output_data.tty pointer using the_only_tty_output, before
dereferencing the pointer.  This prevents crashes with DPMI
servers that provide NULL pointer protection.

4 files changed, 6 insertions, 0 deletions

diff --git a/src/dispnew.c b/src/dispnew.c
index 03fac54e05b..15a58cc2f57 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -6117,6 +6117,7 @@ init_display (void)
 
     t->reference_count++;
 #ifdef MSDOS
+    f->output_data.tty = &the_only_tty_output;
     f->output_data.tty->display_info = &the_only_display_info;
 #else
     if (f->output_method == output_termcap)
diff --git a/src/frame.c b/src/frame.c
index 4ed140d7d08..08925308f9c 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1117,6 +1117,7 @@ make_terminal_frame (struct terminal *terminal)
   f->terminal = terminal;
   f->terminal->reference_count++;
 #ifdef MSDOS
+  f->output_data.tty = &the_only_tty_output;
   f->output_data.tty->display_info = &the_only_display_info;
   if (!inhibit_window_system
       && (!FRAMEP (selected_frame) || !FRAME_LIVE_P (XFRAME (selected_frame))
diff --git a/src/msdos.c b/src/msdos.c
index 3645dc8bb30..4367da4714d 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -420,6 +420,9 @@ static unsigned short outside_cursor;
 /* The only display since MS-DOS does not support multiple ones.  */
 struct tty_display_info the_only_display_info;
 
+/* The only tty_output, since MS-DOS supports only 1 display.  */
+struct tty_output the_only_tty_output;
+
 /* Support for DOS/V (allows Japanese characters to be displayed on
    standard, non-Japanese, ATs).  Only supported for DJGPP v2 and later.  */
 
diff --git a/src/msdos.h b/src/msdos.h
index ff756f8f634..0d15df7a331 100644
--- a/src/msdos.h
+++ b/src/msdos.h
@@ -93,6 +93,7 @@ typedef int XRectangle;
 typedef struct tty_display_info Display_Info;
 
 extern struct tty_display_info the_only_display_info;
+extern struct tty_output the_only_tty_output;
 
 #define FRAME_X_DISPLAY(f) ((Display *) 0)
 #define FRAME_FONT(f) ((f)->output_data.tty->font)