Moved from ports with several enhancements

1 files changed, 120 insertions, 0 deletions

diff --git a/lib/libncurses/lib_insdel.c b/lib/libncurses/lib_insdel.c
new file mode 100644
index 0000000..df68f87
--- /dev/null
+++ b/lib/libncurses/lib_insdel.c
@@ -0,0 +1,120 @@
+
+/* 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 <nterm.h>
+
+int
+winsdel(WINDOW *win, int n)
+{
+int	line, i;
+int touched = 0;
+chtype	*ptr, *temp;
+chtype  **saved;
+chtype	blank = ' ';
+
+	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;
+
+
+    saved = (chtype **)malloc(sizeof(chtype *) * abs(n));
+
+    if (n < 0) {
+		/* save overwritten lines */
+		
+		for (i = 0; i < -n; i++)
+		    saved[i] = win->_line[win->_regbottom-i];
+
+		/* delete n lines */
+		
+		for (line = win->_regbottom; line >= win->_cury; line--)
+		    win->_line[line] = win->_line[line+n];
+
+		/* restore saved lines and blank them */
+
+		for (i = 0, line = win->_regtop; line < win->_regtop-n; line++, i++) {
+		    win->_line[line] = saved[i]; 
+		    temp = win->_line[line];
+		    for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
+				*ptr = blank;
+		}
+    }
+
+    if (n > 0) {
+		/* save overwritten lines */
+		
+		for (i = 0; i < n; i++)
+		    saved[i] = win->_line[win->_regtop+i];
+
+		/* insert n lines */
+		
+		for (line = win->_regtop; line < win->_regtop + n; line++)
+		    win->_line[line] = win->_line[line+n];
+
+		/* restore saved lines and blank them */
+
+		for (i = 0, line = win->_regtop + n; i < n; line--, i++) {
+		    temp = win->_line[line] = saved[i];
+		    for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
+			*ptr = blank;
+		}
+	}
+	
+	free(saved);
+
+	/* as an optimization, if the window is COLS wide we can try
+	   using idl assuming _idlok is true */
+
+    if (win->_maxx == columns && win->_idlok == TRUE) {
+
+		if (n > 0) {
+			mvcur(-1, -1, win->_cury, 0);
+			if (parm_insert_line) {
+				putp(tparm(parm_insert_line, n));
+				touched = 1;
+			} else if (insert_line) {
+				while (n--)
+					putp(insert_line);
+				touched = 1;
+			}
+		}
+
+		if (n < 0) {
+			mvcur(-1, -1, win->_cury, 0);
+			n = abs(n);
+			if (parm_delete_line) {
+				putp(tparm(parm_delete_line, n));
+				touched = 1;
+		    } else if (delete_line) {
+		    	while (n--)
+					putp(delete_line);
+				touched = 1;
+			}
+		}
+
+		mvcur(-1, -1, win->_cury, win->_curx);
+	} 
+	if (touched == 0) 
+	    touchline(win, win->_regtop, win->_regbottom - win->_regtop + 1);
+	touched = 0;
+
+    return OK;
+}