(current_prefix_partial): New var.

(Funiversal_argument): New function, formerly inlined in keyboard.c.
(Fnegative_argument, Fdigit_argument): Likewise.
(clear_prefix_arg): Moved here from keyboard.c.
Don't clear the internal state if we're still building a prefix arg.
(finalize_prefix_arg, describe_prefix_arg): Moved from keyboard.c.
(syms_of_callint): defsubr the new lisp-callable functions.

1 files changed, 105 insertions, 0 deletions

diff --git a/src/callint.c b/src/callint.c
index 0bc1c996366..23907c7f151 100644
--- a/src/callint.c
+++ b/src/callint.c
@@ -28,6 +28,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 extern char *index ();
 
+int current_prefix_partial;
 Lisp_Object Vprefix_arg, Vcurrent_prefix_arg, Qminus, Qplus;
 Lisp_Object Qcall_interactively;
 Lisp_Object Vcommand_history;
@@ -47,6 +48,48 @@ static Lisp_Object preserved_fns;
 /* Marker used within call-interactively to refer to point.  */
 static Lisp_Object point_marker;
 
+
+void
+clear_prefix_arg ()
+{
+  if (!current_perdisplay)
+    abort ();
+  Vprefix_arg = Qnil;
+  if (!current_prefix_partial)
+    {
+      current_perdisplay->prefix_factor = Qnil;
+      current_perdisplay->prefix_value = Qnil;
+      current_perdisplay->prefix_sign = 1;
+      current_perdisplay->prefix_partial = 0;
+    }
+}
+
+void
+finalize_prefix_arg ()
+{
+  if (!NILP (current_perdisplay->prefix_factor))
+    Vprefix_arg = Fcons (current_perdisplay->prefix_factor, Qnil);
+  else if (NILP (current_perdisplay->prefix_value))
+    Vprefix_arg = (current_perdisplay->prefix_sign > 0 ? Qnil : Qminus);
+  else if (current_perdisplay->prefix_sign > 0)
+    Vprefix_arg = current_perdisplay->prefix_value;
+  else
+    XSETINT (Vprefix_arg, -XINT (current_perdisplay->prefix_value));
+  current_perdisplay->prefix_partial = 0;
+}
+
+static void
+describe_prefix_arg ()
+{
+  if (INTEGERP (Vprefix_arg))
+    message ("Arg: %d", Vprefix_arg);
+  else if (CONSP (Vprefix_arg))
+    message ("Arg: [%d]", XCONS (Vprefix_arg)->car);
+  else if (EQ (Vprefix_arg, Qminus))
+    message ("Arg: -");
+}
+
+
 /* This comment supplies the doc string for interactive,
    for make-docfile to see.  We cannot put this in the real DEFUN
    due to limits in the Unix cpp.
@@ -652,6 +695,65 @@ Its numeric meaning is what you would get from `(interactive \"p\")'.")
   return val;
 }
 
+DEFUN ("universal-argument", Funiversal_argument, Suniversal_argument, 0, 0, "",
+  "Begin a numeric argument for the following command.\n\
+Digits or minus sign following \\[universal-argument] make up the numeric argument.\n\
+\\[universal-argument] following the digits or minus sign ends the argument.\n\
+\\[universal-argument] without digits or minus sign provides 4 as argument.\n\
+Repeating \\[universal-argument] without digits or minus sign\n\
+ multiplies the argument by 4 each time.")
+  ()
+{
+  if (!current_prefix_partial)
+    {
+      /* First C-u */
+      XSETFASTINT (current_perdisplay->prefix_factor, 4);
+      current_perdisplay->prefix_value = Qnil;
+      current_perdisplay->prefix_sign = 1;
+      current_perdisplay->prefix_partial = 1;
+    }
+  else if (!NILP (current_perdisplay->prefix_factor))
+    {
+      /* Subsequent C-u */
+      XSETINT (current_perdisplay->prefix_factor,
+               XINT (current_perdisplay->prefix_factor) * 4);
+      current_perdisplay->prefix_partial = 1;
+    }
+  else
+    {
+      /* Terminating C-u */
+      finalize_prefix_arg ();
+      describe_prefix_arg ();
+    }
+}
+
+DEFUN ("negative-argument", Fnegative_argument, Snegative_argument, 0, 0, "",
+  "Begin a negative numeric argument for the next command.\n\
+\\[universal-argument] following digits or minus sign ends the argument.")
+  ()
+{
+  current_perdisplay->prefix_factor = Qnil;
+  current_perdisplay->prefix_sign *= -1;
+  current_perdisplay->prefix_partial = 1;
+}
+
+DEFUN ("digit-argument", Fdigit_argument, Sdigit_argument, 0, 0, "",
+  "Part of the numeric argument for the next command.\n\
+\\[universal-argument] following digits or minus sign ends the argument.")
+  ()
+{
+  int c;
+  if (!(INTEGERP (last_command_char)
+        && (c = (XINT (last_command_char) & 0177)) >= '0' && c <= '9'))
+    error("digit-argument must be bound to a digit key");
+  current_perdisplay->prefix_factor = Qnil;
+  if (NILP (current_perdisplay->prefix_value))
+    XSETFASTINT (current_perdisplay->prefix_value, 0);
+  XSETINT (current_perdisplay->prefix_value,
+           XINT (current_perdisplay->prefix_value) * 10 + (c - '0'));
+  current_perdisplay->prefix_partial = 1;
+}
+
 syms_of_callint ()
 {
   point_marker = Fmake_marker ();
@@ -732,4 +834,7 @@ a way to turn themselves off when a mouse command switches windows.");
   defsubr (&Sinteractive);
   defsubr (&Scall_interactively);
   defsubr (&Sprefix_numeric_value);
+  defsubr (&Suniversal_argument);
+  defsubr (&Snegative_argument);
+  defsubr (&Sdigit_argument);
 }