From 4224cb6213cfd1b6e36dcd8237ffada91bf9dbdb Mon Sep 17 00:00:00 2001
From: Kenichi Handa <handa@m17n.org>
Date: Sat, 26 Sep 1998 04:20:48 +0000
Subject: [PATCH] (Fformat): Check format control characters.

---
 src/editfns.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/editfns.c b/src/editfns.c
index f1f11cf2781..1f855e8480e 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -2551,7 +2551,12 @@ Use %% to put a single % into the output.")
 	       be a double.  */
 	    if (*format == 'e' || *format == 'f' || *format == 'g')
 	      args[n] = Ffloat (args[n]);
+	    else
 #endif
+	      if (*format != 'd' && *format != 'o' && *format != 'x'
+		  && *format != 'X' && *format != 'c')
+		error ("Invalid format operation %%%c", *format);
+
 	    thissize = 30;	
 	    if (*format == 'c'
 		&& (! SINGLE_BYTE_CHAR_P (XINT (args[n]))
-- 
2.39.2