--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/pdcurses/clear.c Sat Jan 09 17:41:21 2016 +0200
@@ -0,0 +1,154 @@
+/* Public Domain Curses */
+
+#include <curspriv.h>
+
+RCSID("$Id: clear.c,v 1.35 2008/07/13 16:08:18 wmcbrine Exp $")
+
+/*man-start**************************************************************
+
+ Name: clear
+
+ Synopsis:
+ int clear(void);
+ int wclear(WINDOW *win);
+ int erase(void);
+ int werase(WINDOW *win);
+ int clrtobot(void);
+ int wclrtobot(WINDOW *win);
+ int clrtoeol(void);
+ int wclrtoeol(WINDOW *win);
+
+ Description:
+ erase() and werase() copy blanks (i.e. the background chtype) to
+ every cell of the window.
+
+ clear() and wclear() are similar to erase() and werase(), but
+ they also call clearok() to ensure that the the window is
+ cleared on the next wrefresh().
+
+ clrtobot() and wclrtobot() clear the window from the current
+ cursor position to the end of the window.
+
+ clrtoeol() and wclrtoeol() clear the window from the current
+ cursor position to the end of the current line.
+
+ Return Value:
+ All functions return OK on success and ERR on error.
+
+ Portability X/Open BSD SYS V
+ clear Y Y Y
+ wclear Y Y Y
+ erase Y Y Y
+ werase Y Y Y
+ clrtobot Y Y Y
+ wclrtobot Y Y Y
+ clrtoeol Y Y Y
+ wclrtoeol Y Y Y
+
+**man-end****************************************************************/
+
+int wclrtoeol(WINDOW *win)
+{
+ int x, y, minx;
+ chtype blank, *ptr;
+
+ PDC_LOG(("wclrtoeol() - called: Row: %d Col: %d\n",
+ win->_cury, win->_curx));
+
+ if (!win)
+ return ERR;
+
+ y = win->_cury;
+ x = win->_curx;
+
+ /* wrs (4/10/93) account for window background */
+
+ blank = win->_bkgd;
+
+ for (minx = x, ptr = &win->_y[y][x]; minx < win->_maxx; minx++, ptr++)
+ *ptr = blank;
+
+ if (x < win->_firstch[y] || win->_firstch[y] == _NO_CHANGE)
+ win->_firstch[y] = x;
+
+ win->_lastch[y] = win->_maxx - 1;
+
+ PDC_sync(win);
+ return OK;
+}
+
+int clrtoeol(void)
+{
+ PDC_LOG(("clrtoeol() - called\n"));
+
+ return wclrtoeol(stdscr);
+}
+
+int wclrtobot(WINDOW *win)
+{
+ int savey = win->_cury;
+ int savex = win->_curx;
+
+ PDC_LOG(("wclrtobot() - called\n"));
+
+ if (!win)
+ return ERR;
+
+ /* should this involve scrolling region somehow ? */
+
+ if (win->_cury + 1 < win->_maxy)
+ {
+ win->_curx = 0;
+ win->_cury++;
+ for (; win->_maxy > win->_cury; win->_cury++)
+ wclrtoeol(win);
+ win->_cury = savey;
+ win->_curx = savex;
+ }
+ wclrtoeol(win);
+
+ PDC_sync(win);
+ return OK;
+}
+
+int clrtobot(void)
+{
+ PDC_LOG(("clrtobot() - called\n"));
+
+ return wclrtobot(stdscr);
+}
+
+int werase(WINDOW *win)
+{
+ PDC_LOG(("werase() - called\n"));
+
+ if (wmove(win, 0, 0) == ERR)
+ return ERR;
+
+ return wclrtobot(win);
+}
+
+int erase(void)
+{
+ PDC_LOG(("erase() - called\n"));
+
+ return werase(stdscr);
+}
+
+int wclear(WINDOW *win)
+{
+ PDC_LOG(("wclear() - called\n"));
+
+ if (!win)
+ return ERR;
+
+ win->_clear = TRUE;
+ return werase(win);
+}
+
+int clear(void)
+{
+ PDC_LOG(("clear() - called\n"));
+
+ return wclear(stdscr);
+}