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