Return to ex_z.c CVS log

Up to [local] / src / usr.bin / vi / ex

rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ex_z.c,v 1.6 2009/10/27 23:59:47 deraadt Exp $	*/

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>

#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../common/common.h"

/*
 * ex_z -- :[line] z [^-.+=] [count] [flags]
 *	Adjust window.
 *
 * PUBLIC: int ex_z(SCR *, EXCMD *);
 */
int
ex_z(sp, cmdp)
	SCR *sp;
	EXCMD *cmdp;
{
	MARK mark_abs;
	recno_t cnt, equals, lno;
	int eofcheck;

	NEEDFILE(sp, cmdp);

	/*
	 * !!!
	 * If no count specified, use either two times the size of the
	 * scrolling region, or the size of the window option.  POSIX
	 * 1003.2 claims that the latter is correct, but historic ex/vi
	 * documentation and practice appear to use the scrolling region.
	 * I'm using the window size as it means that the entire screen
	 * is used instead of losing a line to roundoff.  Note, we drop
	 * a line from the cnt if using the window size to leave room for
	 * the next ex prompt.
	 */
	if (FL_ISSET(cmdp->iflags, E_C_COUNT))
		cnt = cmdp->count;
	else
#ifdef HISTORIC_PRACTICE
		cnt = O_VAL(sp, O_SCROLL) * 2;
#else
		cnt = O_VAL(sp, O_WINDOW) - 1;
#endif

	equals = 0;
	eofcheck = 0;
	lno = cmdp->addr1.lno;

	switch (FL_ISSET(cmdp->iflags,
	    E_C_CARAT | E_C_DASH | E_C_DOT | E_C_EQUAL | E_C_PLUS)) {
	case E_C_CARAT:		/* Display cnt * 2 before the line. */
		eofcheck = 1;
		if (lno > cnt * 2)
			cmdp->addr1.lno = (lno - cnt * 2) + 1;
		else
			cmdp->addr1.lno = 1;
		cmdp->addr2.lno = (cmdp->addr1.lno + cnt) - 1;
		break;
	case E_C_DASH:		/* Line goes at the bottom of the screen. */
		cmdp->addr1.lno = lno > cnt ? (lno - cnt) + 1 : 1;
		cmdp->addr2.lno = lno;
		break;
	case E_C_DOT:		/* Line goes in the middle of the screen. */
		/*
		 * !!!
		 * Historically, the "middleness" of the line overrode the
		 * count, so that "3z.19" or "3z.20" would display the first
		 * 12 lines of the file, i.e. (N - 1) / 2 lines before and
		 * after the specified line.
		 */
		eofcheck = 1;
		cnt = (cnt - 1) / 2;
		cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
		cmdp->addr2.lno = lno + cnt;

		/*
		 * !!!
		 * Historically, z. set the absolute cursor mark.
		 */
		mark_abs.lno = sp->lno;
		mark_abs.cno = sp->cno;
		(void)mark_set(sp, ABSMARK1, &mark_abs, 1);
		break;
	case E_C_EQUAL:		/* Center with hyphens. */
		/*
		 * !!!
		 * Strangeness.  The '=' flag is like the '.' flag (see the
		 * above comment, it applies here as well) but with a special
		 * little hack.  Print out lines of hyphens before and after
		 * the specified line.  Additionally, the cursor remains set
		 * on that line.
		 */
		eofcheck = 1;
		cnt = (cnt - 1) / 2;
		cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
		cmdp->addr2.lno = lno - 1;
		if (ex_pr(sp, cmdp))
			return (1);
		(void)ex_puts(sp, "----------------------------------------\n");
		cmdp->addr2.lno = cmdp->addr1.lno = equals = lno;
		if (ex_pr(sp, cmdp))
			return (1);
		(void)ex_puts(sp, "----------------------------------------\n");
		cmdp->addr1.lno = lno + 1;
		cmdp->addr2.lno = (lno + cnt) - 1;
		break;
	default:
		/* If no line specified, move to the next one. */
		if (F_ISSET(cmdp, E_ADDR_DEF))
			++lno;
		/* FALLTHROUGH */
	case E_C_PLUS:		/* Line goes at the top of the screen. */
		eofcheck = 1;
		cmdp->addr1.lno = lno;
		cmdp->addr2.lno = (lno + cnt) - 1;
		break;
	}

	if (eofcheck) {
		if (db_last(sp, &lno))
			return (1);
		if (cmdp->addr2.lno > lno)
			cmdp->addr2.lno = lno;
	}

	if (ex_pr(sp, cmdp))
		return (1);
	if (equals)
		sp->lno = equals;
	return (0);
}