From: Taylor R Campbell <campbell@mumble.net>
Date: Wed, 2 Jan 2019 05:50:16 +0000 (+0000)
Subject: Implement position for string input ports.
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=d3aaeebeda6aae6e1ac713c41c500c2d9509aa6c;p=mit-scheme.git

Implement position for string input ports.
---

diff --git a/src/runtime/string-io.scm b/src/runtime/string-io.scm
index fb111276e..4c7e0f38c 100644
--- a/src/runtime/string-io.scm
+++ b/src/runtime/string-io.scm
@@ -59,6 +59,7 @@ USA.
 			    (eof? ,string-in/eof?)
 			    (input-line ,string-in/input-line)
 			    (peek-char ,string-in/peek-char)
+			    (position ,string-in/position)
 			    (read-char ,string-in/read-char)
 			    (read-substring ,string-in/read-substring)
 			    (unread-char ,string-in/unread-char)
@@ -73,6 +74,10 @@ USA.
   (let ((ss (textual-port-state port)))
     (not (fix:< (istate-next ss) (istate-end ss)))))
 
+(define (string-in/position port)
+  (let ((ss (textual-port-state port)))
+    (istate-next ss)))
+
 (define (string-in/peek-char port)
   (let ((ss (textual-port-state port)))
     (if (fix:< (istate-next ss) (istate-end ss))