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/*

 * Copyright (c) 1980 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the University of

 *	California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <string.h>

/*

#ifndef lint

static char sccsid[] = "@(#)tgoto.c	5.4 (Berkeley) 6/1/90";

#endifi*/ /* not lint */

#define	CTRL(c)	((c) & 037)

#define MAXRETURNSIZE 64

char	*UP;

char	*BC;

/*

 * Routine to perform cursor addressing.

 * CM is a string containing printf type escapes to allow

 * cursor addressing.  We start out ready to print the destination

 * line, and switch each time we print row or column.

 * The following escapes are defined for substituting row/column:

 *

 *	%d	as in printf

 *	%2	like %2d

 *	%3	like %3d

 *	%.	gives %c hacking special case characters

 *	%+x	like %c but adding x first

 *

 *	The codes below affect the state but don't use up a value.

 *

 *	%>xy	if value > x add y

 *	%r	reverses row/column

 *	%i	increments row/column (for one origin indexing)

 *	%%	gives %

 *	%B	BCD (2 decimal digits encoded in one byte)

 *	%D	Delta Data (backwards bcd)

 *

 * all other characters are ``self-inserting''.

 */

char *

tgoto(CM, destcol, destline)

	char *CM;

	int destcol, destline;

{

	static char result[MAXRETURNSIZE];

	static char added[10];

	char *cp = CM;

	register char *dp = result;

	register int c;

	int oncol = 0;

	register int which = destline;

	if (cp == 0) {

toohard:

		/*

		 * ``We don't do that under BOZO's big top''

		 */

		return ("OOPS");

	}

	added[0] = 0;

	while ( (c = *cp++) ) {

		if (c != '%') {

			*dp++ = c;

			continue;

		}

		switch (c = *cp++) {

#ifdef CM_N

		case 'n':

			destcol ^= 0140;

			destline ^= 0140;

			goto setwhich;

#endif

		case 'd':

			if (which < 10)

				goto one;

			if (which < 100)

				goto two;

			/* fall into... */

		case '3':

			*dp++ = (which / 100) | '0';

			which %= 100;

			/* fall into... */

		case '2':

two:	

			*dp++ = which / 10 | '0';

one:

			*dp++ = which % 10 | '0';

swap:

			oncol = 1 - oncol;

setwhich:

			which = oncol ? destcol : destline;

			continue;

#ifdef CM_GT

		case '>':

			if (which > *cp++)

				which += *cp++;

			else

				cp++;

			continue;

#endif

		case '+':

			which += *cp++;

			/* fall into... */

		case '.':

/*casedot:*/

			/*

			 * This code is worth scratching your head at for a

			 * while.  The idea is that various weird things can

			 * happen to nulls, EOT's, tabs, and newlines by the

			 * tty driver, arpanet, and so on, so we don't send

			 * them if we can help it.

			 *

			 * Tab is taken out to get Ann Arbors to work, otherwise

			 * when they go to column 9 we increment which is wrong

			 * because bcd isn't continuous.  We should take out

			 * the rest too, or run the thing through more than

			 * once until it doesn't make any of these, but that

			 * would make termlib (and hence pdp-11 ex) bigger,

			 * and also somewhat slower.  This requires all

			 * programs which use termlib to stty tabs so they

			 * don't get expanded.  They should do this anyway

			 * because some terminals use ^I for other things,

			 * like nondestructive space.

			 */

			if (which == 0 || which == CTRL('d') || /* which == '\t' || */ which == '\n') {

				if (oncol || UP) /* Assumption: backspace works */

					/*

					 * Loop needed because newline happens

					 * to be the successor of tab.

					 */

					do {

						strcat(added, oncol ? (BC ? BC : "\b") : UP);

						which++;

					} while (which == '\n');

			}

			*dp++ = which;

			goto swap;

		case 'r':

			oncol = 1;

			goto setwhich;

		case 'i':

			destcol++;

			destline++;

			which++;

			continue;

		case '%':

			*dp++ = c;

			continue;

#ifdef CM_B

		case 'B':

			which = (which/10 << 4) + which%10;

			continue;

#endif

#ifdef CM_D

		case 'D':

			which = which - 2 * (which%16);

			continue;

#endif

		default:

			goto toohard;

		}

	}

	strcpy(dp, added);

	return (result);

}