Index: /trunk/ccl/lib/streams.lisp
===================================================================
--- /trunk/ccl/lib/streams.lisp	(revision 4913)
+++ /trunk/ccl/lib/streams.lisp	(revision 4914)
@@ -45,16 +45,18 @@
 
 (defun read-char (&optional input-stream (eof-error-p t) eof-value recursive-p)
-  (declare (ignore recursive-p))
+  (declare (ignore recursive-p)
+           (optimize (speed 3) (space 0)))
   (setq input-stream (designated-input-stream input-stream))
-  (check-eof
-   (if (typep input-stream 'basic-stream)
-     (let* ((ioblock (basic-stream.state input-stream)))
-       (if ioblock
+  (if (typep input-stream 'basic-stream)
+    (let* ((ioblock (basic-stream.state input-stream)))
+      (if ioblock
+        (check-eof
          (funcall (ioblock-read-char-function ioblock) ioblock)
-         (error "~s is closed" input-stream)))
-     (stream-read-char input-stream))
-   input-stream
-   eof-error-p
-   eof-value))
+         input-stream eof-error-p eof-value)
+        (stream-is-closed input-stream)))
+    (check-eof (stream-read-char input-stream)
+               input-stream
+               eof-error-p
+               eof-value)))
 
 (defun unread-char (char &optional input-stream)
@@ -88,9 +90,17 @@
 
 (defun read-byte (stream &optional (eof-error-p t) eof-value)
-  (check-eof
-   (stream-read-byte stream)
-   stream
-   eof-error-p
-   eof-value))
+  (if (typep stream 'basic-stream)
+    (let* ((ioblock (basic-stream.state stream)))
+      (if ioblock
+        (check-eof (funcall (ioblock-read-byte-function ioblock) ioblock)
+                   stream
+                   eof-error-p
+                   eof-value)
+        (stream-is-closed ioblock)))
+    (check-eof
+     (stream-read-byte stream)
+     stream
+     eof-error-p
+     eof-value)))
 
 ;;;;;;;;;;;; OUTPUT STREAMS