* xdisp.c (produce_glyphless_glyph): Limit length of acronym to 6

characters.

src/ChangeLog

 2012-03-24  Andreas Schwab  <schwab@linux-m68k.org>
 
+	* xdisp.c (produce_glyphless_glyph): Limit length of acronym to 6
+	characters.
+
 	* xterm.c (XTread_socket): Only modify handling_signal if
 	!SYNC_INPUT.  (Bug#11080)
 

src/xdisp.c

@@ -24013,7 +24013,7 @@ produce_glyphless_glyph (struct it *it, int for_no_font, Lisp_Object acronym)
 	  sprintf (buf, "%0*X", it->c < 0x10000 ? 4 : 6, it->c);
 	  str = buf;
 	}
-      for (len = 0; str[len] && ASCII_BYTE_P (str[len]); len++)
+      for (len = 0; str[len] && ASCII_BYTE_P (str[len]) && len < 6; len++)
 	code[len] = font->driver->encode_char (font, str[len]);
       upper_len = (len + 1) / 2;
       font->driver->text_extents (font, code, upper_len,