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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: v_z.c,v 1.5 2009/10/27 23:59:48 deraadt Exp $	*/

/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 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 <sys/time.h>

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

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

/*
 * v_z -- [count]z[count][-.+^<CR>]
 *	Move the screen.
 *
 * PUBLIC: int v_z(SCR *, VICMD *);
 */
int
v_z(sp, vp)
	SCR *sp;
	VICMD *vp;
{
	recno_t lno;
	u_int value;

	/*
	 * The first count is the line to use.  If the value doesn't
	 * exist, use the last line.
	 */
	if (F_ISSET(vp, VC_C1SET)) {
		lno = vp->count;
		if (!db_exist(sp, lno) && db_last(sp, &lno))
			return (1);
	} else
		lno = vp->m_start.lno;

	/* Set default return cursor line. */
	vp->m_final.lno = lno;
	vp->m_final.cno = vp->m_start.cno;

	/*
	 * The second count is the displayed window size, i.e. the 'z' command
	 * is another way to get artificially small windows.  Note, you can't
	 * grow beyond the size of the window.
	 *
	 * !!!
	 * A window size of 0 was historically allowed, and simply ignored.
	 * This could be much more simply done by modifying the value of the
	 * O_WINDOW option, but that's not how it worked historically.
	 */
	if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
		if (vp->count2 > O_VAL(sp, O_WINDOW))
			vp->count2 = O_VAL(sp, O_WINDOW);
		if (vs_crel(sp, vp->count2))
			return (1);
	}

	switch (vp->character) {
	case '-':		/* Put the line at the bottom. */
		if (vs_sm_fill(sp, lno, P_BOTTOM))
			return (1);
		break;
	case '.':		/* Put the line in the middle. */
		if (vs_sm_fill(sp, lno, P_MIDDLE))
			return (1);
		break;
	case '+':
		/*
		 * If the user specified a line number, put that line at the
		 * top and move the cursor to it.  Otherwise, scroll forward
		 * a screen from the current screen.
		 */
		if (F_ISSET(vp, VC_C1SET)) {
			if (vs_sm_fill(sp, lno, P_TOP))
				return (1);
			if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
				return (1);
		} else
			if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
				return (1);
		break;
	case '^':
		/*
		 * If the user specified a line number, put that line at the
		 * bottom, move the cursor to it, and then display the screen
		 * before that one.  Otherwise, scroll backward a screen from
		 * the current screen.
		 *
		 * !!!
		 * Note, we match the off-by-one characteristics of historic
		 * vi, here.
		 */
		if (F_ISSET(vp, VC_C1SET)) {
			if (vs_sm_fill(sp, lno, P_BOTTOM))
				return (1);
			if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
				return (1);
			if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
				return (1);
		} else
			if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
				return (1);
		break;
	default:		/* Put the line at the top for <cr>. */
		value = KEY_VAL(sp, vp->character);
		if (value != K_CR && value != K_NL) {
			v_emsg(sp, vp->kp->usage, VIM_USAGE);
			return (1);
		}
		if (vs_sm_fill(sp, lno, P_TOP))
			return (1);
		break;
	}
	return (0);
}

/*
 * vs_crel --
 *	Change the relative size of the current screen.
 *
 * PUBLIC: int vs_crel(SCR *, long);
 */
int
vs_crel(sp, count)
	SCR *sp;
	long count;
{
	sp->t_minrows = sp->t_rows = count;
	if (sp->t_rows > sp->rows - 1)
		sp->t_minrows = sp->t_rows = sp->rows - 1;
	TMAP = HMAP + (sp->t_rows - 1);
	F_SET(sp, SC_SCR_REDRAW);
	return (0);
}