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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 1.17 2010/12/19 00:03:23 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     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