From: Chris Hanson <org/chris-hanson/cph>
Date: Fri, 9 Nov 1990 08:56:28 +0000 (+0000)
Subject: Change peek-char, read-char, and read-string operations to return EOF
X-Git-Tag: 20090517-FFI~11088
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=d9bf2214e2c91e234c9e8c22806c6c76ed56e1b4;p=mit-scheme.git

Change peek-char, read-char, and read-string operations to return EOF
objects when they reach the end of the input region.  This is an
incompatible change required by runtime system version 14.101.
---

diff --git a/v7/src/edwin/bufinp.scm b/v7/src/edwin/bufinp.scm
index afbcdc909..8b5592c1b 100644
--- a/v7/src/edwin/bufinp.scm
+++ b/v7/src/edwin/bufinp.scm
@@ -1,8 +1,8 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;	$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/bufinp.scm,v 1.2 1989/04/28 22:47:26 cph Rel $
+;;;	$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/bufinp.scm,v 1.3 1990/11/09 08:56:14 cph Rel $
 ;;;
-;;;	Copyright (c) 1986, 1989 Massachusetts Institute of Technology
+;;;	Copyright (c) 1986, 1989, 1990 Massachusetts Institute of Technology
 ;;;
 ;;;	This material was developed by the Scheme project at the
 ;;;	Massachusetts Institute of Technology, Department of
@@ -85,9 +85,10 @@
 (define (operation/peek-char port)
   (let ((state (input-port/state port)))
     (let ((current-index (buffer-input-port-state/current-index state)))
-      (and (< current-index (buffer-input-port-state/end-index state))
-	   (group-right-char (buffer-input-port-state/group state)
-			     current-index)))))
+      (if (< current-index (buffer-input-port-state/end-index state))
+	  (group-right-char (buffer-input-port-state/group state)
+			    current-index)
+	  (make-eof-object port)))))
 
 (define (operation/discard-char port)
   (let ((state (input-port/state port)))
@@ -98,13 +99,14 @@
 (define (operation/read-char port)
   (let ((state (input-port/state port)))
     (let ((current-index (buffer-input-port-state/current-index state)))
-      (and (< current-index (buffer-input-port-state/end-index state))
-	   (let ((char
-		  (group-right-char (buffer-input-port-state/group state)
-				    current-index)))
-	     (set-buffer-input-port-state/current-index! state
-							 (1+ current-index))
-	     char)))))
+      (if (< current-index (buffer-input-port-state/end-index state))
+	  (let ((char
+		 (group-right-char (buffer-input-port-state/group state)
+				   current-index)))
+	    (set-buffer-input-port-state/current-index! state
+							(1+ current-index))
+	    char)
+	  (make-eof-object port)))))
 
 (define (operation/read-string port delimiters)
   (let ((state (input-port/state port)))
@@ -112,7 +114,7 @@
 	  (end-index (buffer-input-port-state/end-index state))
 	  (group (buffer-input-port-state/group state)))
       (if (>= current-index end-index)
-	  ""
+	  (make-eof-object port)
 	  (let ((new-index
 		 (or (%find-next-char-in-set group current-index end-index
 					     delimiters)
diff --git a/v7/src/edwin/make.scm b/v7/src/edwin/make.scm
index 3209885d3..ddca76c2f 100644
--- a/v7/src/edwin/make.scm
+++ b/v7/src/edwin/make.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/make.scm,v 3.22 1990/11/02 04:19:34 cph Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/make.scm,v 3.23 1990/11/09 08:56:28 cph Exp $
 
 Copyright (c) 1989, 1990 Massachusetts Institute of Technology
 
@@ -37,4 +37,4 @@ MIT in each case. |#
 (declare (usual-integrations))
 
 (package/system-loader "edwin" '() 'QUERY)
-(add-system! (make-system "Edwin" 3 22 '()))
\ No newline at end of file
+(add-system! (make-system "Edwin" 3 23 '()))
\ No newline at end of file