home *** CD-ROM | disk | FTP | other *** search
- /*
- * 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[] = "@(#)cr_put.c 5.3 (Berkeley) 6/30/88";
- #endif /* not lint */
-
- # include "curses.ext"
- #include <string.h>
- #include <termcap.h>
-
- # define HARDTABS 8
-
- static int plod __PROTO((int));
- static int plodput __PROTO((int));
-
- /*
- * 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).
- */
-
- /*
- * 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;
-
- void 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();
- }
-
- void fgoto()
- {
- reg char *cgp;
- reg int l, c;
-
- if (destcol >= COLS) {
- destline += destcol / COLS;
- destcol %= COLS;
- }
- if (outcol >= COLS) {
- l = (outcol + 1) / COLS;
- outline += l;
- outcol %= COLS;
- if (AM == 0) {
- while (l > 0) {
- if (_pfast)
- if (CR)
- _puts(CR);
- else
- _putchar('\r', stdout);
- if (NL)
- _puts(NL);
- else
- _putchar('\n', stdout);
- l--;
- }
- outcol = 0;
- }
- if (outline > LINES - 1) {
- destline -= outline - (LINES - 1);
- outline = LINES - 1;
- }
- }
- if (destline >= LINES) {
- l = destline;
- destline = LINES - 1;
- if (outline < LINES - 1) {
- c = destcol;
- if (_pfast == 0 && !CA)
- destcol = 0;
- fgoto();
- destcol = c;
- }
- while (l >= LINES) {
- /*
- * 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)
- _puts(NL);
- else
- _putchar('\n', stdout);
- l--;
- if (_pfast == 0)
- outcol = 0;
- }
- }
- if (destline < outline && !(CA || UP))
- destline = outline;
- if (CA) {
- cgp = tgoto(CM, destcol, destline);
- if (plod((int)strlen(cgp)) > 0)
- plod(0);
- else
- tputs(cgp, 0, _fputchar);
- }
- 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;
-
- static int plodput(c)
- int c;
- {
- if (plodflg)
- plodcnt--;
- else
- _putchar(c, stdout);
- }
-
- static int plod(cnt)
- int 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 = (int)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)
- tputs(NL, 0, plodput);
- else
- plodput('\n');
- if (plodcnt < 0)
- goto out;
- if (NONL || _pfast == 0)
- outcol = 0;
- }
- if (BT)
- k = (int)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, stdout);
- 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.
- */
- int tabcol(col, ts)
- int col, ts;
- {
- int offset;
-
- if (col >= COLS) {
- offset = COLS * (col / COLS);
- col -= offset;
- }
- else
- offset = 0;
- return col + ts - (col % ts) + offset;
- }
-