1 files changed, 58 insertions, 0 deletions
diff --git a/lib/libcurses/lib_redrawln.c b/lib/libcurses/lib_redrawln.c
new file mode 100644
index 00000000000..0fc687e03c8
--- /dev/null
+++ b/lib/libcurses/lib_redrawln.c
@@ -0,0 +1,58 @@
+/*	$OpenBSD: lib_redrawln.c,v 1.1 1997/12/03 05:21:28 millert Exp $	*/
+
+/******************************************************************************
+ * Copyright 1997 by Thomas E. Dickey <dickey@clark.net>                      *
+ * All Rights Reserved.                                                       *
+ *                                                                            *
+ * Permission to use, copy, modify, and distribute this software and its      *
+ * documentation for any purpose and without fee is hereby granted, provided  *
+ * that the above copyright notice appear in all copies and that both that    *
+ * copyright notice and this permission notice appear in supporting           *
+ * documentation, and that the name of the above listed copyright holder(s)   *
+ * not be used in advertising or publicity pertaining to distribution of the  *
+ * software without specific, written prior permission.                       *
+ *                                                                            *
+ * THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD   *
+ * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND  *
+ * FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE  *
+ * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES          *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN      *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR *
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.                *
+ ******************************************************************************/
+
+/*
+ *	lib_redrawln.c
+ *
+ *	The routine wredrawln().
+ *
+ */
+
+#include <curses.priv.h>
+
+MODULE_ID("Id: lib_redrawln.c,v 1.1 1997/11/29 20:10:56 tom Exp $")
+
+int wredrawln(WINDOW *win, int beg, int num)
+{
+int i;
+
+	T((T_CALLED("wredrawln(%p,%d,%d)"), win, beg, num));
+
+	if (touchline(win, beg, num) == OK) {
+		size_t len = win->_maxx * sizeof(chtype);
+
+		/*
+		 * XSI says that wredrawln() tells the library not to base
+		 * optimization on the contents of the lines that are marked.
+		 * We do that by changing the contents to nulls after touching
+		 * the corresponding lines to get the optimizer's attention.
+		 *
+		 * FIXME: this won't work if the application makes further
+		 * updates before the next refresh.
+		 */
+		for (i = beg; (i < beg + num) && (i < win->_maxy); i++) {
+			memset(win->_line[i].text, 0, len);
+		}
+	}
+	returnCode(OK);
+}