X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=contrib%2Fsb-rotate-byte%2Frotate-byte.lisp;h=2861359f029ab4afce3d70e56c63f0d4720f1e55;hb=7f4bf063d5f4716b87d34cc706f05b27ad3906b1;hp=02342f82ad04ec27f380c5cf38d462e08c9f8e17;hpb=cec71f1e4e1ead387f2ea642f760e553b6053f2b;p=sbcl.git

diff --git a/contrib/sb-rotate-byte/rotate-byte.lisp b/contrib/sb-rotate-byte/rotate-byte.lisp
index 02342f8..2861359 100644
--- a/contrib/sb-rotate-byte/rotate-byte.lisp
+++ b/contrib/sb-rotate-byte/rotate-byte.lisp
@@ -1,20 +1,23 @@
 (in-package "SB-ROTATE-BYTE")
 
-(defun rotate-byte (count byte integer)
-  #+sb-doc "FIXME: Write a docstring"
-  (rotate-byte count byte integer))
+(defun rotate-byte (count bytespec integer)
+  "Rotates a field of bits within INTEGER; specifically, returns an
+integer that contains the bits of INTEGER rotated COUNT times
+leftwards within the byte specified by BYTESPEC, and elsewhere
+contains the bits of INTEGER."
+  (rotate-byte count bytespec integer))
 
 (defun %rotate-byte (count size pos integer)
   (let ((count (nth-value 1 (round count size)))
-	(mask (1- (ash 1 size))))
+        (mask (1- (ash 1 size))))
     (logior (logand integer (lognot (ash mask pos)))
-	    (let ((field (logand (ash mask pos) integer)))
-	      (logand (ash mask pos)
-		      (if (> count 0)
-			  (logior (ash field count)
-				  (ash field (- count size)))
-			  (logior (ash field count)
-				  (ash field (+ count size)))))))))
+            (let ((field (logand (ash mask pos) integer)))
+              (logand (ash mask pos)
+                      (if (> count 0)
+                          (logior (ash field count)
+                                  (ash field (- count size)))
+                          (logior (ash field count)
+                                  (ash field (+ count size)))))))))
 
 (defun %unsigned-32-rotate-byte (count integer)
   ;; inhibit transforms