[Emacs-diffs] Changes to emacs/lisp/xt-mouse.el,v [EMACS_22_BASE]

[Stefan Monnier]

CVSROOT:        /sources/emacs
Module name:    emacs
Branch:         EMACS_22_BASE
Changes by:     Stefan Monnier <monnier>        07/05/25 15:00:41

Index: xt-mouse.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/xt-mouse.el,v
retrieving revision 1.39
retrieving revision 1.39.2.1
diff -u -b -r1.39 -r1.39.2.1
--- xt-mouse.el 3 Apr 2007 21:16:17 -0000       1.39
+++ xt-mouse.el 25 May 2007 15:00:41 -0000      1.39.2.1
@@ -122,6 +122,22 @@
         (+ c #x8000000 128)
       c)))
 
+(defun xterm-mouse-truncate-wrap (f)
+  "Truncate with wrap-around."
+  (condition-case nil
+      ;; First try the built-in truncate, in case there's no overflow.
+      (truncate f)
+    ;; In case of overflow, do wraparound by hand.
+    (range-error
+     ;; In our case, we wrap around every 3 days or so, so if we assume
+     ;; a maximum of 65536 wraparounds, we're safe for a couple years.
+     ;; Using a power of 2 makes rounding errors less likely.
+     (let* ((maxwrap (* 65536 2048))
+            (dbig (truncate (/ f maxwrap)))
+            (fdiff (- f (* 1.0 maxwrap dbig))))
+       (+ (truncate fdiff) (* maxwrap dbig))))))
+
+
 (defun xterm-mouse-event ()
   "Convert XTerm mouse event to Emacs mouse event."
   (let* ((type (- (xterm-mouse-event-read) #o40))
@@ -129,7 +145,7 @@
         (y (- (xterm-mouse-event-read) #o40 1))
         ;; Emulate timestamp information.  This is accurate enough
         ;; for default value of mouse-1-click-follows-link (450msec).
-        (timestamp (truncate
+        (timestamp (xterm-mouse-truncate-wrap
                     (* 1000
                        (- (float-time)
                           (or xt-mouse-epoch
@@ -206,5 +222,5 @@
 
 (provide 'xt-mouse)
 
-;;; arch-tag: 84962d4e-fae9-4c13-a9d7-ef4925a4ac03
+;; arch-tag: 84962d4e-fae9-4c13-a9d7-ef4925a4ac03
 ;;; xt-mouse.el ends here