From de712da3be4b586a962c50b78decfa1fa279478b Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Mon, 13 Jan 1997 03:33:26 +0000
Subject: [PATCH] (concat): Take modulus of thisindex before shifting. Declare
 thisindex as unsigned.

---
 src/fns.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/fns.c b/src/fns.c
index 1c7a98cae46..7991403eea4 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -409,7 +409,7 @@ concat (nargs, args, target_type, last_special)
     {
       Lisp_Object thislen;
       int thisleni;
-      register int thisindex = 0;
+      register unsigned int thisindex = 0;
 
       this = args[argnum];
       if (!CONSP (this))
@@ -443,7 +443,7 @@ concat (nargs, args, target_type, last_special)
 		       / BITS_PER_CHAR);
 		  int byte;
 		  byte = XBOOL_VECTOR (val)->data[thisindex / BITS_PER_CHAR];
-		  if (byte & (1 << thisindex))
+		  if (byte & (1 << (thisindex % BITS_PER_CHAR)))
 		    elt = Qt;
 		  else
 		    elt = Qnil;
-- 
2.39.5