From: Chris Hanson <org/chris-hanson/cph>
Date: Sat, 23 Mar 1996 06:20:57 +0000 (+0000)
Subject: Add error check so that attempting to insert a negative number of
X-Git-Tag: 20090517-FFI~5638
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=910815d0fca916f477102390e58b0bd01dbbb600;p=mit-scheme.git

Add error check so that attempting to insert a negative number of
characters results in a tractable error rather than a SIGSEGV.
---

diff --git a/v7/src/edwin/grpops.scm b/v7/src/edwin/grpops.scm
index 6ca13f0ff..413b018d7 100644
--- a/v7/src/edwin/grpops.scm
+++ b/v7/src/edwin/grpops.scm
@@ -1,8 +1,8 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;	$Id: grpops.scm,v 1.22 1995/04/17 21:46:10 cph Exp $
+;;;	$Id: grpops.scm,v 1.23 1996/03/23 06:20:57 cph Exp $
 ;;;
-;;;	Copyright (c) 1986, 1989-95 Massachusetts Institute of Technology
+;;;	Copyright (c) 1986, 1989-96 Massachusetts Institute of Technology
 ;;;
 ;;;	This material was developed by the Scheme project at the
 ;;;	Massachusetts Institute of Technology, Department of
@@ -113,6 +113,8 @@
   (group-insert-chars! group index char 1))
 
 (define (group-insert-chars! group index char n)
+  (if (fix:< n 0)
+      (error:bad-range-argument n 'GROUP-INSERT-CHARS!))
   (let ((interrupt-mask (set-interrupt-enables! interrupt-mask/gc-ok)))
     (prepare-gap-for-insert! group index n)
     (let ((text (group-text group))