6 files changed, 49 insertions, 45 deletions

diff --git a/src/coding.c b/src/coding.c
index b914574bbca..f7da394def1 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7305,12 +7305,13 @@ Return the corresponding character code in Big5.  */)
 }
 
 DEFUN ("set-terminal-coding-system-internal", Fset_terminal_coding_system_internal,
-       Sset_terminal_coding_system_internal, 1, 1, 0,
+       Sset_terminal_coding_system_internal, 1, 2, 0,
        doc: /* Internal use only.  */)
-     (coding_system)
+     (coding_system, display)
      Lisp_Object coding_system;
+     Lisp_Object display;
 {
-  struct coding_system *terminal_coding = FRAME_TERMINAL_CODING (SELECTED_FRAME ());
+  struct coding_system *terminal_coding = DISPLAY_TERMINAL_CODING (get_display (display, 1));
   CHECK_SYMBOL (coding_system);
   setup_coding_system (Fcheck_coding_system (coding_system), terminal_coding);
   /* We had better not send unsafe characters to terminal.  */
@@ -7343,33 +7344,39 @@ DEFUN ("set-safe-terminal-coding-system-internal", Fset_safe_terminal_coding_sys
 }
 
 DEFUN ("terminal-coding-system", Fterminal_coding_system,
-       Sterminal_coding_system, 0, 0, 0,
-       doc: /* Return coding system specified for terminal output.  */)
-     ()
+       Sterminal_coding_system, 0, 1, 0,
+       doc: /* Return coding system specified for terminal output on the given display.
+DISPLAY may be a display id, a frame, or nil for the selected frame's display.  */)
+     (display)
+     Lisp_Object display;
 {
-  return FRAME_TERMINAL_CODING (SELECTED_FRAME ())->symbol;
+  return DISPLAY_TERMINAL_CODING (get_display (display, 1))->symbol;
 }
 
 DEFUN ("set-keyboard-coding-system-internal", Fset_keyboard_coding_system_internal,
-       Sset_keyboard_coding_system_internal, 1, 1, 0,
+       Sset_keyboard_coding_system_internal, 1, 2, 0,
        doc: /* Internal use only.  */)
-     (coding_system)
+     (coding_system, display)
      Lisp_Object coding_system;
+     Lisp_Object display;
 {
+  struct display *d = get_display (display, 1);
   CHECK_SYMBOL (coding_system);
+
   setup_coding_system (Fcheck_coding_system (coding_system),
-                       FRAME_KEYBOARD_CODING (SELECTED_FRAME ()));
+                       DISPLAY_KEYBOARD_CODING (d));
   /* Character composition should be disabled.  */
-  FRAME_KEYBOARD_CODING (SELECTED_FRAME ())->composing = COMPOSITION_DISABLED;
+  DISPLAY_KEYBOARD_CODING (d)->composing = COMPOSITION_DISABLED;
   return Qnil;
 }
 
 DEFUN ("keyboard-coding-system", Fkeyboard_coding_system,
-       Skeyboard_coding_system, 0, 0, 0,
+       Skeyboard_coding_system, 0, 1, 0,
        doc: /* Return coding system specified for decoding keyboard input.  */)
-     ()
+     (display)
+     Lisp_Object display;
 {
-  return FRAME_KEYBOARD_CODING (SELECTED_FRAME ())->symbol;
+  return DISPLAY_KEYBOARD_CODING (get_display (display, 1))->symbol;
 }
 
 
diff --git a/src/dispextern.h b/src/dispextern.h
index abcda4fc731..df6bbd00eec 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -2925,7 +2925,7 @@ extern int per_line_cost P_ ((char *));
 extern void calculate_costs P_ ((struct frame *));
 extern void set_tty_color_mode P_ ((struct frame *, Lisp_Object));
 extern void tty_setup_colors P_ ((struct tty_display_info *, int));
-extern struct display *get_display P_ ((Lisp_Object display));
+extern struct display *get_display P_ ((Lisp_Object display, int));
 extern struct display *get_named_tty_display P_ ((char *));
 EXFUN (Fdisplay_tty_type, 1);
 extern struct display *init_initial_display P_ ((void));
diff --git a/src/frame.c b/src/frame.c
index d0d4b3491e4..f86cb0d43da 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -698,9 +698,7 @@ affects all frames on the same terminal device.  */)
       {
         display_device = XCDR (display_device);
         CHECK_NUMBER (display_device);
-        d = get_display (XINT (display_device));
-        if (!d)
-          wrong_type_argument (Qdisplay_live_p, display_device);
+        d = get_display (XINT (display_device), 1);
       }
   }
   
@@ -1073,7 +1071,7 @@ The display device is represented by its integer identifier.  */)
 
   CHECK_LIVE_FRAME (frame);
 
-  d = get_display (frame);
+  d = get_display (frame, 0);
 
   if (!d)
     return Qnil;
diff --git a/src/term.c b/src/term.c
index bc30e3fb0d8..9c733a46abb 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2105,17 +2105,17 @@ set_tty_color_mode (f, val)
 
 /* Return the display object specified by DISPLAY.  DISPLAY may be a
    display id, a frame, or nil for the display device of the current
-   frame. */
+   frame.  If THROW is zero, return NULL for failure, otherwise throw
+   an error.  */
 
 struct display *
-get_display (Lisp_Object display)
+get_display (Lisp_Object display, int throw)
 {
+  Lisp_Object result = NULL;
+
   if (NILP (display))
     display = selected_frame;
 
-  if (! INTEGERP (display) && ! FRAMEP (display))
-    return NULL;
-
   if (INTEGERP (display))
     {
       struct display *d;
@@ -2123,15 +2123,21 @@ get_display (Lisp_Object display)
       for (d = display_list; d; d = d->next_display)
         {
           if (d->id == XINT (display))
-            return d;
+            {
+              result = d;
+              break;
+            }
         }
-      return NULL;
     }
   else if (FRAMEP (display))
     {
-      return FRAME_DISPLAY (XFRAME (display));
+      result = FRAME_DISPLAY (XFRAME (display));
     }
-  return NULL;
+
+  if (result == NULL && throw)
+    wrong_type_argument (Qdisplay_live_p, display);
+
+  return result;
 }
 
 /* Return the tty display object specified by DISPLAY. */
@@ -2139,7 +2145,7 @@ get_display (Lisp_Object display)
 static struct display *
 get_tty_display (Lisp_Object display)
 {
-  struct display *d = get_display (display);
+  struct display *d = get_display (display, 0);
   
   if (d && d->type == output_initial)
     d = NULL;
@@ -2194,10 +2200,7 @@ frame's display). */)
   (display)
      Lisp_Object display;
 {
-  struct display *d = get_display (display);
-
-  if (!d)
-    wrong_type_argument (Qdisplay_live_p, display);
+  struct display *d = get_display (display, 1);
 
   if (d->name)
     return build_string (d->name);
@@ -2210,10 +2213,8 @@ DEFUN ("display-tty-type", Fdisplay_tty_type, Sdisplay_tty_type, 0, 1, 0,
   (display)
      Lisp_Object display;
 {
-  struct display *d = get_display (display);
+  struct display *d = get_display (display, 1);
 
-  if (!d)
-    wrong_type_argument (Qdisplay_live_p, display);
   if (d->type != output_termcap)
     error ("Display %d is not a termcap display", d->id);
            
@@ -2228,10 +2229,7 @@ DEFUN ("display-controlling-tty-p", Fdisplay_controlling_tty_p, Sdisplay_control
   (display)
      Lisp_Object display;
 {
-  struct display *d = get_display (display);
-
-  if (!d)
-    wrong_type_argument (Qdisplay_live_p, display);
+  struct display *d = get_display (display, 1);
 
   if (d->type != output_termcap || d->display_info.tty->name)
     return Qnil;
@@ -3157,7 +3155,7 @@ but if the second argument FORCE is non-nil, you may do so. */)
 {
   struct display *d, *p;
 
-  d = get_display (display);
+  d = get_display (display, 0);
 
   if (!d)
     return Qnil;
@@ -3193,7 +3191,7 @@ Displays are represented by their integer identifiers. */)
   if (!INTEGERP (object))
     return Qnil;
 
-  d = get_display (object);
+  d = get_display (object, 0);
 
   if (!d)
     return Qnil;
diff --git a/src/termhooks.h b/src/termhooks.h
index d424ad75e4a..788b57e9d1e 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -550,6 +550,9 @@ extern struct display *display_list;
 #define FRAME_TERMINAL_CODING(f) ((f)->display->terminal_coding)
 #define FRAME_KEYBOARD_CODING(f) ((f)->display->keyboard_coding)
 
+#define DISPLAY_TERMINAL_CODING(d) ((d)->terminal_coding)
+#define DISPLAY_KEYBOARD_CODING(d) ((d)->keyboard_coding)
+
 #define FRAME_RIF(f) ((f)->display->rif)
 
 #define FRAME_DISPLAY(f) ((f)->display)
diff --git a/src/xfns.c b/src/xfns.c
index 6a9ec8a6b47..666acfec773 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -263,10 +263,8 @@ check_x_display_info (frame)
     }
   else if (INTEGERP (frame))
     {
-      struct display *d = get_display (XINT (frame));
+      struct display *d = get_display (XINT (frame), 1);
 
-      if (!d)
-        wrong_type_argument (Qdisplay_live_p, frame);
       if (d->type != output_x_window)
         error ("Display %d is not an X display", XINT (frame));