4.3BSD-Tahoe/usr/src/usr.lib/libcurses/refresh.c
/*
* Copyright (c) 1981 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)refresh.c 5.3 (Berkeley) 6/30/88";
#endif /* not lint */
/*
* make the current screen look like "win" over the area coverd by
* win.
*/
# include "curses.ext"
# ifdef DEBUG
# define STATIC
# else
# define STATIC static
# endif
STATIC short ly, lx;
STATIC bool curwin;
WINDOW *_win = NULL;
wrefresh(win)
reg WINDOW *win;
{
reg short wy;
reg int retval;
reg WINDOW *orig;
/*
* make sure were in visual state
*/
if (_endwin) {
_puts(VS);
_puts(TI);
_endwin = FALSE;
}
/*
* initialize loop parameters
*/
ly = curscr->_cury;
lx = curscr->_curx;
wy = 0;
_win = win;
curwin = (win == curscr);
if (win->_clear || curscr->_clear || curwin) {
if ((win->_flags & _FULLWIN) || curscr->_clear) {
_puts(CL);
ly = 0;
lx = 0;
if (!curwin) {
curscr->_clear = FALSE;
curscr->_cury = 0;
curscr->_curx = 0;
werase(curscr);
}
touchwin(win);
}
win->_clear = FALSE;
}
if (!CA) {
if (win->_curx != 0)
_putchar('\n');
if (!curwin)
werase(curscr);
}
# ifdef DEBUG
fprintf(outf, "REFRESH(%0.2o): curwin = %d\n", win, curwin);
fprintf(outf, "REFRESH:\n\tfirstch\tlastch\n");
# endif
for (wy = 0; wy < win->_maxy; wy++) {
# ifdef DEBUG
fprintf(outf, "%d\t%d\t%d\n", wy, win->_firstch[wy],
win->_lastch[wy]);
# endif
if (win->_firstch[wy] != _NOCHANGE)
if (makech(win, wy) == ERR)
return ERR;
else {
if (win->_firstch[wy] >= win->_ch_off)
win->_firstch[wy] = win->_maxx +
win->_ch_off;
if (win->_lastch[wy] < win->_maxx +
win->_ch_off)
win->_lastch[wy] = win->_ch_off;
if (win->_lastch[wy] < win->_firstch[wy])
win->_firstch[wy] = _NOCHANGE;
}
# ifdef DEBUG
fprintf(outf, "\t%d\t%d\n", win->_firstch[wy],
win->_lastch[wy]);
# endif
}
if (win == curscr)
domvcur(ly, lx, win->_cury, win->_curx);
else {
if (win->_leave) {
curscr->_cury = ly;
curscr->_curx = lx;
ly -= win->_begy;
lx -= win->_begx;
if (ly >= 0 && ly < win->_maxy && lx >= 0 &&
lx < win->_maxx) {
win->_cury = ly;
win->_curx = lx;
}
else
win->_cury = win->_curx = 0;
}
else {
domvcur(ly, lx, win->_cury + win->_begy,
win->_curx + win->_begx);
curscr->_cury = win->_cury + win->_begy;
curscr->_curx = win->_curx + win->_begx;
}
}
retval = OK;
ret:
_win = NULL;
fflush(stdout);
return retval;
}
/*
* make a change on the screen
*/
STATIC
makech(win, wy)
reg WINDOW *win;
short wy;
{
reg char *nsp, *csp, *ce;
reg short wx, lch, y;
reg int nlsp, clsp; /* last space in lines */
wx = win->_firstch[wy] - win->_ch_off;
if (wx >= win->_maxx)
return OK;
else if (wx < 0)
wx = 0;
lch = win->_lastch[wy] - win->_ch_off;
if (lch < 0)
return OK;
else if (lch >= win->_maxx)
lch = win->_maxx - 1;;
y = wy + win->_begy;
if (curwin)
csp = " ";
else
csp = &curscr->_y[wy + win->_begy][wx + win->_begx];
nsp = &win->_y[wy][wx];
if (CE && !curwin) {
for (ce = &win->_y[wy][win->_maxx - 1]; *ce == ' '; ce--)
if (ce <= win->_y[wy])
break;
nlsp = ce - win->_y[wy];
}
if (!curwin)
ce = CE;
else
ce = NULL;
while (wx <= lch) {
if (*nsp != *csp) {
domvcur(ly, lx, y, wx + win->_begx);
# ifdef DEBUG
fprintf(outf, "MAKECH: 1: wx = %d, lx = %d\n", wx, lx);
# endif
ly = y;
lx = wx + win->_begx;
while (*nsp != *csp && wx <= lch) {
if (ce != NULL && wx >= nlsp && *nsp == ' ') {
/*
* check for clear to end-of-line
*/
ce = &curscr->_y[ly][COLS - 1];
while (*ce == ' ')
if (ce-- <= csp)
break;
clsp = ce - curscr->_y[ly] - win->_begx;
# ifdef DEBUG
fprintf(outf, "MAKECH: clsp = %d, nlsp = %d\n", clsp, nlsp);
# endif
if (clsp - nlsp >= strlen(CE)
&& clsp < win->_maxx) {
# ifdef DEBUG
fprintf(outf, "MAKECH: using CE\n");
# endif
_puts(CE);
lx = wx + win->_begx;
while (wx++ <= clsp)
*csp++ = ' ';
return OK;
}
ce = NULL;
}
/*
* enter/exit standout mode as appropriate
*/
if (SO && (*nsp&_STANDOUT) != (curscr->_flags&_STANDOUT)) {
if (*nsp & _STANDOUT) {
_puts(SO);
curscr->_flags |= _STANDOUT;
}
else {
_puts(SE);
curscr->_flags &= ~_STANDOUT;
}
}
wx++;
if (wx >= win->_maxx && wy == win->_maxy - 1)
if (win->_scroll) {
if ((curscr->_flags&_STANDOUT) &&
(win->_flags & _ENDLINE))
if (!MS) {
_puts(SE);
curscr->_flags &= ~_STANDOUT;
}
if (!curwin)
_putchar((*csp = *nsp) & 0177);
else
_putchar(*nsp & 0177);
if (win->_flags&_FULLWIN && !curwin)
scroll(curscr);
ly = win->_begy+win->_cury;
lx = win->_begx+win->_curx;
return OK;
}
else if (win->_flags&_SCROLLWIN) {
lx = --wx;
return ERR;
}
if (!curwin)
_putchar((*csp++ = *nsp) & 0177);
else
_putchar(*nsp & 0177);
# ifdef FULLDEBUG
fprintf(outf,
"MAKECH:putchar(%c)\n", *nsp & 0177);
# endif
if (UC && (*nsp & _STANDOUT)) {
_putchar('\b');
_puts(UC);
}
nsp++;
}
# ifdef DEBUG
fprintf(outf, "MAKECH: 2: wx = %d, lx = %d\n", wx, lx);
# endif
if (lx == wx + win->_begx) /* if no change */
break;
lx = wx + win->_begx;
if (lx >= COLS && AM) {
lx = 0;
ly++;
/*
* xn glitch: chomps a newline after auto-wrap.
* we just feed it now and forget about it.
*/
if (XN) {
_putchar('\n');
_putchar('\r');
}
}
}
else if (wx <= lch)
while (*nsp == *csp && wx <= lch) {
nsp++;
if (!curwin)
csp++;
++wx;
}
else
break;
# ifdef DEBUG
fprintf(outf, "MAKECH: 3: wx = %d, lx = %d\n", wx, lx);
# endif
}
return OK;
}
/*
* perform a mvcur, leaving standout mode if necessary
*/
STATIC
domvcur(oy, ox, ny, nx)
int oy, ox, ny, nx; {
if (curscr->_flags & _STANDOUT && !MS) {
_puts(SE);
curscr->_flags &= ~_STANDOUT;
}
mvcur(oy, ox, ny, nx);
}