Fix bug in FIND-TAG-DEFAULT. This change requires new primitive

SCAN-FORWARD-PREFIX-CHARS, first installed in microcode 11.81.

diff --git a/v7/src/edwin/tagutl.scm b/v7/src/edwin/tagutl.scm
index ddb1c747228548d88fa0e259bf373de979ace1b6..1622b0af09676a9400645f2d56837f3ca13bdce9 100644 (file)
--- a/v7/src/edwin/tagutl.scm
+++ b/v7/src/edwin/tagutl.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/tagutl.scm,v 1.41 1991/05/15 01:12:06 cph Exp $
+;;;    $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/tagutl.scm,v 1.42 1991/05/20 20:31:21 cph Exp $
 ;;;
 ;;;    Copyright (c) 1986, 1989-91 Massachusetts Institute of Technology
 ;;;
@@ -120,22 +120,23 @@ See documentation of variable tags-file-name."
   unspecific)
 
 (define (find-tag-default)
-  (let ((point (current-point)))
-    (let ((end (group-end point)))
-      (let ((mark
-            (re-search-backward
-             "\\sw\\|\\s_"
-             (or (re-match-forward "\\(\\sw\\|\\s_\\)*" point end)
-                 point)
-             (group-start point))))
-       (and mark
-            (let ((mark (mark1+ mark)))
-              (let ((mark*
-                     (re-search-forward "\\(\\s'\\)*"
-                                        (backward-sexp mark 1 'LIMIT)
-                                        mark)))
-                (and mark*
-                     (extract-string mark* mark)))))))))
+  (let ((end
+        (let ((point (current-point)))
+          (or (re-match-forward "\\(\\sw\\|\\s_\\)+"
+                                point
+                                (group-end point)
+                                false)
+              (let ((mark
+                     (re-search-backward "\\sw\\|\\s_"
+                                         point
+                                         (group-start point)
+                                         false)))
+                (and mark
+                     (mark1+ mark)))))))
+    (and end
+        (extract-string (forward-prefix-chars (backward-sexp end 1 'LIMIT)
+                                              end)
+                        end))))
 \f
 (define (find-tag string buffer start find-file)
   (let ((end (group-end start)))