Make reader accept "#*" as a valid, zero-length bit string.

diff --git a/v7/src/runtime/parse.scm b/v7/src/runtime/parse.scm
index 1de139ebfbba9a4e2f3fca7f1326a48f8f994075..7fa41fc40cdc406c8735d49465341728869d8472 100644 (file)
--- a/v7/src/runtime/parse.scm
+++ b/v7/src/runtime/parse.scm
@@ -1,8 +1,8 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/parse.scm,v 14.9 1989/10/26 06:46:39 cph Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/parse.scm,v 14.10 1990/09/07 00:27:35 cph Exp $
 
-Copyright (c) 1988, 1989 Massachusetts Institute of Technology
+Copyright (c) 1988, 1989, 1990 Massachusetts Institute of Technology
 
 This material was developed by the Scheme project at the Massachusetts
 Institute of Technology, Department of Electrical Engineering and
@@ -286,10 +286,21 @@ MIT in each case. |#
 (define (parse-object/bit-string)
   (discard-char)
   (let ((string (read-atom)))
-    (unsigned-integer->bit-string
-     (string-length string)
-     (or (string->number string 2)
-        (error "READ: bad syntax for bit-string")))))\f
+    (let ((length (string-length string)))
+      (unsigned-integer->bit-string
+       length
+       (let loop ((index 0) (result 0))
+        (if (< index length)
+            (loop (1+ index)
+                  (+ (* result 2)
+                     (case (string-ref string index)
+                       ((#\0) 0)
+                       ((#\1) 1)
+                       (else
+                        (error "READ: bad bit-string syntax"
+                               (string-append "#*" string))))))
+            result))))))
+\f
 ;;;; Lists/Vectors
 
 (define (parse-object/list-open)