Ultrix-3.1/src/libcurses/cr_put.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
/* SCCSID: @(#)cr_put.c 3.0 4/22/86 */
# include "curses.ext"
# define HARDTABS 8
extern char *tgoto();
int plodput();
/*
* Terminal driving and line formatting routines.
* Basic motion optimizations are done here as well
* as formatting of lines (printing of control characters,
* line numbering and the like).
*
* 3/27/83 (Berkeley) @(#)cr_put.c 1.4
*/
/*
* Sync the position of the output cursor.
* Most work here is rounding for terminal boundaries getting the
* column position implied by wraparound or the lack thereof and
* rolling up the screen to get destline on the screen.
*/
static int outcol, outline, destcol, destline;
WINDOW *_win;
mvcur(ly, lx, y, x)
int ly, lx, y, x; {
#ifdef DEBUG
fprintf(outf, "MVCUR: moving cursor from (%d,%d) to (%d,%d)\n", ly, lx, y, x);
#endif
destcol = x;
destline = y;
outcol = lx;
outline = ly;
fgoto();
}
char
_putchar(c)
reg char c; {
putchar(c);
#ifdef DEBUG
fprintf(outf, "_PUTCHAR(%s)\n", unctrl(c));
#endif
}
fgoto()
{
reg char *cgp;
reg int l, c;
if (destcol > COLS - 1) {
destline += destcol / COLS;
destcol %= COLS;
}
if (outcol > COLS - 1) {
l = (outcol + 1) / COLS;
outline += l;
outcol %= COLS;
if (AM == 0) {
while (l > 0) {
if (_pfast)
if (CR)
tputs(CR, 0, _putchar);
else
_putchar('\r');
if (NL)
tputs(NL, 0, _putchar);
else
_putchar('\n');
l--;
}
outcol = 0;
}
if (outline > LINES - 1) {
destline -= outline - (LINES - 1);
outline = LINES - 1;
}
}
if (destline > LINES - 1) {
l = destline;
destline = LINES - 1;
if (outline < LINES - 1) {
c = destcol;
if (_pfast == 0 && !CA)
destcol = 0;
fgoto();
destcol = c;
}
while (l > LINES - 1) {
/*
* The following linefeed (or simulation thereof)
* is supposed to scroll up the screen, since we
* are on the bottom line. We make the assumption
* that linefeed will scroll. If ns is in the
* capability list this won't work. We should
* probably have an sc capability but sf will
* generally take the place if it works.
*
* Superbee glitch: in the middle of the screen we
* have to use esc B (down) because linefeed screws up
* in "Efficient Paging" (what a joke) mode (which is
* essential in some SB's because CRLF mode puts garbage
* in at end of memory), but you must use linefeed to
* scroll since down arrow won't go past memory end.
* I turned this off after recieving Paul Eggert's
* Superbee description which wins better.
*/
if (NL /* && !XB */ && _pfast)
tputs(NL, 0, _putchar);
else
_putchar('\n');
l--;
if (_pfast == 0)
outcol = 0;
}
}
if (destline < outline && !(CA || UP))
destline = outline;
if (CA)
{
cgp = tgoto(CM, destcol, destline);
if (plod(strlen(cgp)) > 0)
plod(0);
else
tputs(cgp, 0, _putchar);
}
else
plod(0);
outline = destline;
outcol = destcol;
}
/*
* Move (slowly) to destination.
* Hard thing here is using home cursor on really deficient terminals.
* Otherwise just use cursor motions, hacking use of tabs and overtabbing
* and backspace.
*/
static int plodcnt, plodflg;
plodput(c)
{
if (plodflg)
plodcnt--;
else
_putchar(c);
}
plod(cnt)
{
register int i, j, k;
register int soutcol, soutline;
plodcnt = plodflg = cnt;
soutcol = outcol;
soutline = outline;
/*
* Consider homing and moving down/right from there, vs moving
* directly with local motions to the right spot.
*/
if (HO) {
/*
* i is the cost to home and tab/space to the right to
* get to the proper column. This assumes ND space costs
* 1 char. So i+destcol is cost of motion with home.
*/
if (GT)
i = (destcol / HARDTABS) + (destcol % HARDTABS);
else
i = destcol;
/*
* j is cost to move locally without homing
*/
if (destcol >= outcol) { /* if motion is to the right */
j = destcol / HARDTABS - outcol / HARDTABS;
if (GT && j)
j += destcol % HARDTABS;
else
j = destcol - outcol;
}
else
/* leftward motion only works if we can backspace. */
if (outcol - destcol <= i && (BS || BC))
i = j = outcol - destcol; /* cheaper to backspace */
else
j = i + 1; /* impossibly expensive */
/* k is the absolute value of vertical distance */
k = outline - destline;
if (k < 0)
k = -k;
j += k;
/*
* Decision. We may not have a choice if no UP.
*/
if (i + destline < j || (!UP && destline < outline)) {
/*
* Cheaper to home. Do it now and pretend it's a
* regular local motion.
*/
tputs(HO, 0, plodput);
outcol = outline = 0;
}
else if (LL) {
/*
* Quickly consider homing down and moving from there.
* Assume cost of LL is 2.
*/
k = (LINES - 1) - destline;
if (i + k + 2 < j && (k<=0 || UP)) {
tputs(LL, 0, plodput);
outcol = 0;
outline = LINES - 1;
}
}
}
else
/*
* No home and no up means it's impossible.
*/
if (!UP && destline < outline)
return -1;
if (GT)
i = destcol % HARDTABS + destcol / HARDTABS;
else
i = destcol;
/*
if (BT && outcol > destcol && (j = (((outcol+7) & ~7) - destcol - 1) >> 3)) {
j *= (k = strlen(BT));
if ((k += (destcol&7)) > 4)
j += 8 - (destcol&7);
else
j += k;
}
else
*/
j = outcol - destcol;
/*
* If we will later need a \n which will turn into a \r\n by
* the system or the terminal, then don't bother to try to \r.
*/
if ((NONL || !_pfast) && outline < destline)
goto dontcr;
/*
* If the terminal will do a \r\n and there isn't room for it,
* then we can't afford a \r.
*/
if (NC && outline >= destline)
goto dontcr;
/*
* If it will be cheaper, or if we can't back up, then send
* a return preliminarily.
*/
if (j > i + 1 || outcol > destcol && !BS && !BC) {
/*
* BUG: this doesn't take the (possibly long) length
* of CR into account.
*/
if (CR)
tputs(CR, 0, plodput);
else
plodput('\r');
if (NC) {
if (NL)
tputs(NL, 0, plodput);
else
plodput('\n');
outline++;
}
outcol = 0;
}
dontcr:
while (outline < destline) {
outline++;
if (NL && _pfast)
tputs(NL, 0, plodput);
else
plodput('\n');
if (plodcnt < 0)
goto out;
if (NONL || _pfast == 0)
outcol = 0;
}
if (BT)
k = strlen(BT);
while (outcol > destcol) {
if (plodcnt < 0)
goto out;
/*
if (BT && outcol - destcol > k + 4) {
tputs(BT, 0, plodput);
outcol--;
outcol &= ~7;
continue;
}
*/
outcol--;
if (BC)
tputs(BC, 0, plodput);
else
plodput('\b');
}
while (outline > destline) {
outline--;
tputs(UP, 0, plodput);
if (plodcnt < 0)
goto out;
}
if (GT && destcol - outcol > 1) {
for (;;) {
i = tabcol(outcol, HARDTABS);
if (i > destcol)
break;
if (TA)
tputs(TA, 0, plodput);
else
plodput('\t');
outcol = i;
}
if (destcol - outcol > 4 && i < COLS && (BC || BS)) {
if (TA)
tputs(TA, 0, plodput);
else
plodput('\t');
outcol = i;
while (outcol > destcol) {
outcol--;
if (BC)
tputs(BC, 0, plodput);
else
plodput('\b');
}
}
}
while (outcol < destcol) {
/*
* move one char to the right. We don't use ND space
* because it's better to just print the char we are
* moving over.
*/
if (_win != NULL)
if (plodflg) /* avoid a complex calculation */
plodcnt--;
else {
i = curscr->_y[outline][outcol];
if ((i&_STANDOUT) == (curscr->_flags&_STANDOUT))
putchar(i);
else
goto nondes;
}
else
nondes:
if (ND)
tputs(ND, 0, plodput);
else
plodput(' ');
outcol++;
if (plodcnt < 0)
goto out;
}
out:
if (plodflg) {
outcol = soutcol;
outline = soutline;
}
return(plodcnt);
}
/*
* Return the column number that results from being in column col and
* hitting a tab, where tabs are set every ts columns. Work right for
* the case where col > COLS, even if ts does not divide COLS.
*/
tabcol(col, ts)
int col, ts;
{
int offset, result;
if (col >= COLS) {
offset = COLS * (col / COLS);
col -= offset;
}
else
offset = 0;
return col + ts - (col % ts) + offset;
}