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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 
42 MODULE_ID("$Id: lib_redrawln.c,v 1.12 2007/10/13 20:08:56 tom Exp $")
43 
44 NCURSES_EXPORT(int)
45 wredrawln(WINDOW *win, int beg, int num)
46 {
47     int i;
48     int end;
49     size_t len;
50 
51     T((T_CALLED("wredrawln(%p,%d,%d)"), win, beg, num));
52 
53     if (win == 0)
54 	returnCode(ERR);
55 
56     if (beg < 0)
57 	beg = 0;
58 
59     if (touchline(win, beg, num) == ERR)
60 	returnCode(ERR);
61 
62     if (touchline(curscr, beg + win->_begy, num) == ERR)
63 	returnCode(ERR);
64 
65     end = beg + num;
66     if (end > curscr->_maxy + 1)
67 	end = curscr->_maxy + 1;
68     if (end > win->_maxy + 1)
69 	end = win->_maxy + 1;
70 
71     len = (win->_maxx + 1);
72     if (len > (size_t) (curscr->_maxx + 1))
73 	len = (size_t) (curscr->_maxx + 1);
74     len *= sizeof(curscr->_line[0].text[0]);
75 
76     for (i = beg; i < end; i++) {
77 	int crow = i + win->_begy;
78 
79 	memset(curscr->_line[crow].text + win->_begx, 0, len);
80 	_nc_make_oldhash(crow);
81     }
82 
83     returnCode(OK);
84 }
85