[Emacs-diffs] emacs/lisp/calc calc-bin.el

[Jay Belanger]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Jay Belanger <jpb>      09/11/16 00:00:22

Modified files:
        lisp/calc      : calc-bin.el 

Log message:
        (calc-word-size): Reset the variables `math-2-word-size' and 
`math-half-2-word-size'.
        (math-format-complement-signed, math-symclip, calcFunc-symclip, 
calc-symclip): New functions.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/emacs/lisp/calc/calc-bin.el?cvsroot=emacs&r1=1.25&r2=1.26

Patches:
Index: calc-bin.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/calc/calc-bin.el,v
retrieving revision 1.25
retrieving revision 1.26
diff -u -b -r1.25 -r1.26
--- calc-bin.el 5 Jan 2009 03:19:59 -0000       1.25
+++ calc-bin.el 16 Nov 2009 00:00:22 -0000      1.26
@@ -154,6 +154,10 @@
         (calc-change-mode '(calc-word-size calc-previous-modulo)
                           (list n (math-power-of-2 (math-abs n)))
                           calc-leading-zeros)))
+   (setq math-2-word-size (math-power-of-2 (math-abs n)))
+   (setq math-half-2-word-size (math-power-of-2 (1- (math-abs n))))
+   (calc-do-refresh)
+   (calc-refresh-evaltos)
    (if (< n 0)
        (message "Binary word size is %d bits (2's complement)" (- n))
      (message "Binary word size is %d bits" n))))
@@ -164,24 +168,28 @@
 
 ;;; d-prefix mode commands.
 
-(defun calc-radix (n)
+(defun calc-radix (n &optional arg)
   (interactive "NDisplay radix (2-36): ")
   (calc-wrapper
    (if (and (>= n 2) (<= n 36))
        (progn
-        (calc-change-mode 'calc-number-radix n t)
+        (calc-change-mode 
+          (list 'calc-number-radix 'calc-complement-signed-mode)
+          (list n (and (= n 2) arg)) t)
         ;; also change global value so minibuffer sees it
         (setq-default calc-number-radix calc-number-radix))
      (setq n calc-number-radix))
-   (message "Number radix is %d" n)))
+   (if calc-complement-signed-mode
+       (message "Number radix is %d, complement signed mode is on." n)
+     (message "Number radix is %d" n))))
 
 (defun calc-decimal-radix ()
   (interactive)
   (calc-radix 10))
 
-(defun calc-binary-radix ()
-  (interactive)
-  (calc-radix 2))
+(defun calc-binary-radix (&optional arg)
+  (interactive "P")
+  (calc-radix 2 arg))
 
 (defun calc-octal-radix ()
   (interactive)
@@ -812,6 +820,63 @@
                                                       calc-number-radix))))))
                               math-radix-float-cache))))))))
 
+;;; Complement signed mode
+
+(defun math-format-complement-signed (a)
+  "Format an integer in complement signed mode."
+  (let* (;(calc-leading-zeros t)
+         (overflow nil)
+         (negative nil)
+         (num
+          (cond
+           ((or (eq a 0)
+                (and (Math-integer-posp a)))
+            (if (integerp a)
+                (math-format-radix a)
+              (math-format-bignum-radix (cdr a))))
+           ((Math-integer-negp a)
+            (let ((newa (math-add a math-2-word-size)))
+              (if (integerp newa)
+                  (math-format-radix newa)
+                (math-format-bignum-radix (cdr newa))))))))
+    (let* ((calc-internal-prec 6)
+           (digs (math-compute-max-digits (math-abs calc-word-size)
+                                          calc-number-radix))
+           (len (length num)))
+      (if (< len digs)
+          (setq num (concat (make-string (- digs len) ?0) num))))
+    (concat 
+     (number-to-string calc-number-radix)
+     "##"
+     num)))
+
+(defun math-symclip (a)
+  "Reduce A to between -2^(w-1) and 2^(w-1)-1."
+  (if (not (Math-num-integerp a))
+      (math-reject-arg a 'integerp)
+    (if (and (Math-lessp a math-half-2-word-size)
+             (let 
+                 ((comparison (math-compare (Math-integer-neg a) 
math-half-2-word-size)))
+               (or (= comparison 0)
+                   (= comparison -1))))
+        a
+      (let ((smalla (math-clip a)))
+        (if (Math-lessp smalla math-half-2-word-size)
+            smalla
+          (math-sub smalla math-2-word-size))))))
+
+(defalias 'calcFunc-symclip 'math-symclip)
+
+(defun calc-symclip (n)
+  "Reduce N to between -2^(w-1) and 2^(w-1)-1."
+  (interactive "P")
+  (calc-slow-wrapper
+   (calc-enter-result 1 "sclp"
+                     (append '(calcFunc-symclip)
+                             (calc-top-list-n 1)
+                             (and n (list (prefix-numeric-value n)))))))
+
+
 (provide 'calc-bin)
 
 ;; arch-tag: f6dba7bc-53b2-41ae-919c-c266ab0ca8b3