X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=ncurses%2Ftty%2Ftty_update.c;h=b86dfe4eb9f8f414030177abee3ecad45723a60a;hb=81c758ae6facb0256dbc8a9d1d93795dd093d683;hp=fd35c47beb2e2bdd174f365736f70e04ab35ff46;hpb=61d8ae54ff6acd69e9dab2afb21591d44c46ee1f;p=ncurses.git

diff --git a/ncurses/tty/tty_update.c b/ncurses/tty/tty_update.c
index fd35c47b..b86dfe4e 100644
--- a/ncurses/tty/tty_update.c
+++ b/ncurses/tty/tty_update.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2017,2018 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2018,2019 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -84,7 +84,7 @@
 
 #include <ctype.h>
 
-MODULE_ID("$Id: tty_update.c,v 1.298 2018/05/05 19:11:55 tom Exp $")
+MODULE_ID("$Id: tty_update.c,v 1.300 2019/02/25 21:42:01 tom Exp $")
 
 /*
  * This define controls the line-breakout optimization.  Every once in a
@@ -373,9 +373,18 @@ PutAttrChar(NCURSES_SP_DCLx CARG_CH_T ch)
 	} else
 #endif
 	if (!SP_PARM->_screen_acs_map[c8]) {
+	    /*
+	     * If we found no mapping for a given alternate-character set item
+	     * in the terminal description, attempt to use the ASCII fallback
+	     * code which is populated in the _acs_map[] array.  If that did
+	     * not correspond to a line-drawing, etc., graphics character, the
+	     * array entry would be empty.
+	     */
 	    chtype temp = UChar(SP_PARM->_acs_map[c8]);
-	    RemAttr(attr, A_ALTCHARSET);
-	    SetChar(my_ch, temp, AttrOf(attr));
+	    if (temp) {
+		RemAttr(attr, A_ALTCHARSET);
+		SetChar(my_ch, temp, AttrOf(attr));
+	    }
 	}
 
 	/*
@@ -677,8 +686,9 @@ EmitRange(NCURSES_SP_DCLx const NCURSES_CH_T * ntext, int num)
 	    } else if (repeat_char != 0 &&
 #if USE_WIDEC_SUPPORT
 		       (!SP_PARM->_screen_unicode &&
-			((AttrOf(ntext0) & A_ALTCHARSET) == 0 ||
-			 (CharOf(ntext0) < ACS_LEN))) &&
+			(CharOf(ntext0) < ((AttrOf(ntext0) & A_ALTCHARSET)
+					   ? ACS_LEN
+					   : 256))) &&
 #endif
 		       runcount > SP_PARM->_rep_cost) {
 		NCURSES_CH_T temp;