1 files changed, 49 insertions, 0 deletions
diff --git a/lib/libncurses/lib_insdel.c b/lib/libncurses/lib_insdel.c
new file mode 100644
index 0000000..da26a2a
--- /dev/null
+++ b/lib/libncurses/lib_insdel.c
@@ -0,0 +1,49 @@
+
+/* This work is copyrighted. See COPYRIGHT.OLD & COPYRIGHT.NEW for   *
+*  details. If they are missing then this copy is in violation of    *
+*  the copyright conditions.                                        */
+
+/*
+**	lib_insdel.c
+**
+**	The routine winsdel(win, n).
+**  positive n insert n lines above current line
+**  negative n delete n lines starting from current line 
+**
+*/
+
+#include <stdlib.h>
+#include "curses.priv.h"
+#include "terminfo.h"
+
+int
+winsdelln(WINDOW *win, int n)
+{
+	int ret, sscroll, stop, sbot;
+
+	T(("winsdel(%x,%d) called", win, n));
+
+	if (n == 0)
+		return OK;
+	if (n < 0 && win->_cury - n >= win->_maxy)
+		/* request to delete too many lines */
+		/* should we truncate to an appropriate number? */
+		return ERR;
+
+	sscroll = win->_scroll;
+	stop = win->_regtop;
+	sbot = win->_regbottom;
+
+	win->_scroll = TRUE;
+	win->_regtop = win->_cury;
+	if (win->_regtop > win->_regbottom)
+		win->_regbottom = win->_maxy;
+
+	ret = wscrl(win, -n);
+
+	win->_scroll = sscroll;
+	win->_regtop = stop;
+	win->_regbottom = sbot;
+
+	return ret;
+}