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2 * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
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28
29/****************************************************************************
30 *  Author: Thomas E. Dickey <dickey@clark.net> 1997                        *
31 ****************************************************************************/
32
33/*
34 *	lib_redrawln.c
35 *
36 *	The routine wredrawln().
37 *
38 */
39
40#include <curses.priv.h>
41
42MODULE_ID("$Id: lib_redrawln.c,v 1.17 2010/12/19 00:03:23 tom Exp $")
43
44NCURSES_EXPORT(int)
45wredrawln(WINDOW *win, int beg, int num)
46{
47    int i;
48    int end;
49    size_t len;
50    SCREEN *sp;
51
52    T((T_CALLED("wredrawln(%p,%d,%d)"), (void *) win, beg, num));
53
54    if (win == 0)
55	returnCode(ERR);
56
57    sp = _nc_screen_of(win);
58
59    if (beg < 0)
60	beg = 0;
61
62    if (touchline(win, beg, num) == ERR)
63	returnCode(ERR);
64
65    if (touchline(CurScreen(sp), beg + win->_begy, num) == ERR)
66	returnCode(ERR);
67
68    end = beg + num;
69    if (end > CurScreen(sp)->_maxy + 1 - win->_begy)
70	end = CurScreen(sp)->_maxy + 1 - win->_begy;
71    if (end > win->_maxy + 1)
72	end = win->_maxy + 1;
73
74    len = (size_t) (win->_maxx + 1);
75    if (len > (size_t) (CurScreen(sp)->_maxx + 1 - win->_begx))
76	len = (size_t) (CurScreen(sp)->_maxx + 1 - win->_begx);
77    len *= sizeof(CurScreen(sp)->_line[0].text[0]);
78
79    for (i = beg; i < end; i++) {
80	int crow = i + win->_begy;
81
82	memset(CurScreen(sp)->_line[crow].text + win->_begx, 0, len);
83	NCURSES_SP_NAME(_nc_make_oldhash) (NCURSES_SP_ARGx crow);
84    }
85
86    returnCode(OK);
87}
88