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unifdef -U NO_DPROMPT and GOSREC.
NO_DPROMPT has been around since the import of mg2a and it has never been
considered a "(Common) compile-time option" in the Makefile.
Assume everyone has been running mg this way since at least 2000 if not
already in the 90s.

Same with GOSREC. Has always been there but it looks like no one noticed
it (and no one was running with it). Indeed, the mg tutorial appears to be
oblivious to GOSREC being an option.

With this commit there are no more #ifndef blocks in mg. Only a couple of
#ifdef blocks remain.

ok lum@

/*	$OpenBSD: window.c,v 1.33 2015/03/25 20:53:31 bcallah Exp $	*/

/* This file is in the public domain. */

/*
 *		Window handling.
 */

#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

#include "def.h"

struct mgwin *
new_window(struct buffer *bp)
{
	struct mgwin *wp;

	wp = calloc(1, sizeof(struct mgwin));
	if (wp == NULL)
		return (NULL);

	wp->w_bufp = bp;
	wp->w_dotp = NULL;
	wp->w_doto = 0;
	wp->w_markp = NULL;
	wp->w_marko = 0;
	wp->w_rflag = 0;
	wp->w_frame = 0;
	wp->w_wrapline = NULL;
	wp->w_dotline = wp->w_markline = 1;
	if (bp)
		bp->b_nwnd++;
	return (wp);
}

/*
 * Reposition dot in the current window to line "n".  If the argument is
 * positive, it is that line.  If it is negative it is that line from the
 * bottom.  If it is 0 the window is centered (this is what the standard
 * redisplay code does).
 */
/* ARGSUSED */
int
reposition(int f, int n)
{
	curwp->w_frame = (f & FFARG) ? (n >= 0 ? n + 1 : n) : 0;
	curwp->w_rflag |= WFFRAME;
	sgarbf = TRUE;
	return (TRUE);
}

/*
 * Refresh the display.  A call is made to the "ttresize" entry in the
 * terminal handler, which tries to reset "nrow" and "ncol".  They will,
 * however, never be set outside of the NROW or NCOL range.  If the display
 * changed size, arrange that everything is redone, then call "update" to
 * fix the display.  We do this so the new size can be displayed.  In the
 * normal case the call to "update" in "main.c" refreshes the screen, and
 * all of the windows need not be recomputed. This call includes a
 * 'force' parameter to ensure that the redraw is done, even after a
 * a suspend/continue (where the window size parameters will already
 * be updated). Note that when you get to the "display unusable"
 * message, the screen will be messed up. If you make the window bigger
 * again, and send another command, everything will get fixed!
 */
int
redraw(int f, int n)
{
	return (do_redraw(f, n, FALSE));
}

/* ARGSUSED */
int
do_redraw(int f, int n, int force)
{
	struct mgwin	*wp;
	int		 oldnrow, oldncol;

	oldnrow = nrow;
	oldncol = ncol;
	ttresize();
	if (nrow != oldnrow || ncol != oldncol || force) {

		/* find last */
		wp = wheadp;
		while (wp->w_wndp != NULL)
			wp = wp->w_wndp;

		/* check if too small */
		if (nrow < wp->w_toprow + 3) {
			dobeep();
			ewprintf("Display unusable");
			return (FALSE);
		}
		wp->w_ntrows = nrow - wp->w_toprow - 2;
		sgarbf = TRUE;
		update(CMODE);
	} else
		sgarbf = TRUE;
	return (TRUE);
}

/*
 * The command to make the next window (next => down the screen) the current
 * window. There are no real errors, although the command does nothing if
 * there is only 1 window on the screen.
 */
/* ARGSUSED */
int
nextwind(int f, int n)
{
	struct mgwin	*wp;

	if ((wp = curwp->w_wndp) == NULL)
		wp = wheadp;
	curwp = wp;
	curbp = wp->w_bufp;
	return (TRUE);
}

/* not in GNU Emacs */
/*
 * This command makes the previous window (previous => up the screen) the
 * current window. There are no errors, although the command does not do
 * a lot if there is only 1 window.
 */
/* ARGSUSED */
int
prevwind(int f, int n)
{
	struct mgwin	*wp1, *wp2;

	wp1 = wheadp;
	wp2 = curwp;
	if (wp1 == wp2)
		wp2 = NULL;
	while (wp1->w_wndp != wp2)
		wp1 = wp1->w_wndp;
	curwp = wp1;
	curbp = wp1->w_bufp;
	return (TRUE);
}

/*
 * This command makes the current window the only window on the screen.  Try
 * to set the framing so that "." does not have to move on the display.  Some
 * care has to be taken to keep the values of dot and mark in the buffer
 * structures right if the destruction of a window makes a buffer become
 * undisplayed.
 */
/* ARGSUSED */
int
onlywind(int f, int n)
{
	struct mgwin	*wp;
	struct line	*lp;
	int		 i;

	while (wheadp != curwp) {
		wp = wheadp;
		wheadp = wp->w_wndp;
		if (--wp->w_bufp->b_nwnd == 0) {
			wp->w_bufp->b_dotp = wp->w_dotp;
			wp->w_bufp->b_doto = wp->w_doto;
			wp->w_bufp->b_markp = wp->w_markp;
			wp->w_bufp->b_marko = wp->w_marko;
		}
		free(wp);
	}
	while (curwp->w_wndp != NULL) {
		wp = curwp->w_wndp;
		curwp->w_wndp = wp->w_wndp;
		if (--wp->w_bufp->b_nwnd == 0) {
			wp->w_bufp->b_dotp = wp->w_dotp;
			wp->w_bufp->b_doto = wp->w_doto;
			wp->w_bufp->b_markp = wp->w_markp;
			wp->w_bufp->b_marko = wp->w_marko;
		}
		free(wp);
	}
	lp = curwp->w_linep;
	i = curwp->w_toprow;
	while (i != 0 && lback(lp) != curbp->b_headp) {
		--i;
		lp = lback(lp);
	}
	curwp->w_toprow = 0;

	/* 2 = mode, echo */
	curwp->w_ntrows = nrow - 2;
	curwp->w_linep = lp;
	curwp->w_rflag |= WFMODE | WFFULL;
	return (TRUE);
}

/*
 * Split the current window.  A window smaller than 3 lines cannot be split.
 * The only other error that is possible is a "malloc" failure allocating the
 * structure for the new window.
 * If called with a FFOTHARG, flags on the new window are set to 'n'.
 */
/* ARGSUSED */
int
splitwind(int f, int n)
{
	struct mgwin	*wp, *wp1, *wp2;
	struct line	*lp;
	int		 ntru, ntrd, ntrl;

	if (curwp->w_ntrows < 3) {
		dobeep();
		ewprintf("Cannot split a %d line window", curwp->w_ntrows);
		return (FALSE);
	}
	wp = new_window(curbp);
	if (wp == NULL) {
		dobeep();
		ewprintf("Unable to create a window");
		return (FALSE);
	}

	/* use the current dot and mark */
	wp->w_dotp = curwp->w_dotp;
	wp->w_doto = curwp->w_doto;
	wp->w_markp = curwp->w_markp;
	wp->w_marko = curwp->w_marko;
	wp->w_dotline = curwp->w_dotline;
	wp->w_markline = curwp->w_markline;

	/* figure out which half of the screen we're in */
	ntru = (curwp->w_ntrows - 1) / 2;	/* Upper size */
	ntrl = (curwp->w_ntrows - 1) - ntru;	/* Lower size */

	for (lp = curwp->w_linep, ntrd = 0; lp != curwp->w_dotp;
	    lp = lforw(lp))
		ntrd++;

	lp = curwp->w_linep;

	/* old is upper window */
	if (ntrd <= ntru) {
		/* hit mode line */
		if (ntrd == ntru)
			lp = lforw(lp);
		curwp->w_ntrows = ntru;
		wp->w_wndp = curwp->w_wndp;
		curwp->w_wndp = wp;
		wp->w_toprow = curwp->w_toprow + ntru + 1;
		wp->w_ntrows = ntrl;
	/* old is lower window */
	} else {
		wp1 = NULL;
		wp2 = wheadp;
		while (wp2 != curwp) {
			wp1 = wp2;
			wp2 = wp2->w_wndp;
		}
		if (wp1 == NULL)
			wheadp = wp;
		else
			wp1->w_wndp = wp;
		wp->w_wndp = curwp;
		wp->w_toprow = curwp->w_toprow;
		wp->w_ntrows = ntru;

		/* mode line */
		++ntru;
		curwp->w_toprow += ntru;
		curwp->w_ntrows = ntrl;
		while (ntru--)
			lp = lforw(lp);
	}

	/* adjust the top lines if necessary */
	curwp->w_linep = lp;
	wp->w_linep = lp;

	curwp->w_rflag |= WFMODE | WFFULL;
	wp->w_rflag |= WFMODE | WFFULL;
	/* if FFOTHARG, set flags) */
	if (f & FFOTHARG)
		wp->w_flag = n;
		
	return (TRUE);
}

/*
 * Enlarge the current window.  Find the window that loses space.  Make sure
 * it is big enough.  If so, hack the window descriptions, and ask redisplay
 * to do all the hard work.  You don't just set "force reframe" because dot
 * would move.
 */
/* ARGSUSED */
int
enlargewind(int f, int n)
{
	struct mgwin	*adjwp;
	struct line	*lp;
	int		 i;

	if (n < 0)
		return (shrinkwind(f, -n));
	if (wheadp->w_wndp == NULL) {
		dobeep();
		ewprintf("Only one window");
		return (FALSE);
	}
	if ((adjwp = curwp->w_wndp) == NULL) {
		adjwp = wheadp;
		while (adjwp->w_wndp != curwp)
			adjwp = adjwp->w_wndp;
	}
	if (adjwp->w_ntrows <= n) {
		dobeep();
		ewprintf("Impossible change");
		return (FALSE);
	}

	/* shrink below */
	if (curwp->w_wndp == adjwp) {
		lp = adjwp->w_linep;
		for (i = 0; i < n && lp != adjwp->w_bufp->b_headp; ++i)
			lp = lforw(lp);
		adjwp->w_linep = lp;
		adjwp->w_toprow += n;
	/* shrink above */
	} else {
		lp = curwp->w_linep;
		for (i = 0; i < n && lback(lp) != curbp->b_headp; ++i)
			lp = lback(lp);
		curwp->w_linep = lp;
		curwp->w_toprow -= n;
	}
	curwp->w_ntrows += n;
	adjwp->w_ntrows -= n;
	curwp->w_rflag |= WFMODE | WFFULL;
	adjwp->w_rflag |= WFMODE | WFFULL;
	return (TRUE);
}

/*
 * Shrink the current window.  Find the window that gains space.  Hack at the
 * window descriptions. Ask the redisplay to do all the hard work.
 */
int
shrinkwind(int f, int n)
{
	struct mgwin	*adjwp;
	struct line	*lp;
	int		 i;

	if (n < 0)
		return (enlargewind(f, -n));
	if (wheadp->w_wndp == NULL) {
		dobeep();
		ewprintf("Only one window");
		return (FALSE);
	}
	/*
	 * Bit of flakiness - KRANDOM means it was an internal call, and
	 * to be trusted implicitly about sizes.
	 */
	if (!(f & FFRAND) && curwp->w_ntrows <= n) {
		dobeep();
		ewprintf("Impossible change");
		return (FALSE);
	}
	if ((adjwp = curwp->w_wndp) == NULL) {
		adjwp = wheadp;
		while (adjwp->w_wndp != curwp)
			adjwp = adjwp->w_wndp;
	}

	/* grow below */
	if (curwp->w_wndp == adjwp) {
		lp = adjwp->w_linep;
		for (i = 0; i < n && lback(lp) != adjwp->w_bufp->b_headp; ++i)
			lp = lback(lp);
		adjwp->w_linep = lp;
		adjwp->w_toprow -= n;
	/* grow above */
	} else {
		lp = curwp->w_linep;
		for (i = 0; i < n && lp != curbp->b_headp; ++i)
			lp = lforw(lp);
		curwp->w_linep = lp;
		curwp->w_toprow += n;
	}
	curwp->w_ntrows -= n;
	adjwp->w_ntrows += n;
	curwp->w_rflag |= WFMODE | WFFULL;
	adjwp->w_rflag |= WFMODE | WFFULL;
	return (TRUE);
}

/*
 * Delete current window. Call shrink-window to do the screen updating, then
 * throw away the window.
 */
/* ARGSUSED */
int
delwind(int f, int n)
{
	struct mgwin	*wp, *nwp;

	wp = curwp;		/* Cheap...		 */

	/* shrinkwind returning false means only one window... */
	if (shrinkwind(FFRAND, wp->w_ntrows + 1) == FALSE)
		return (FALSE);
	if (--wp->w_bufp->b_nwnd == 0) {
		wp->w_bufp->b_dotp = wp->w_dotp;
		wp->w_bufp->b_doto = wp->w_doto;
		wp->w_bufp->b_markp = wp->w_markp;
		wp->w_bufp->b_marko = wp->w_marko;
		wp->w_bufp->b_dotline = wp->w_dotline;
		wp->w_bufp->b_markline = wp->w_markline;
	}

	/* since shrinkwind did't crap out, we know we have a second window */
	if (wp == wheadp)
		wheadp = curwp = wp->w_wndp;
	else if ((curwp = wp->w_wndp) == NULL)
		curwp = wheadp;
	curbp = curwp->w_bufp;
	for (nwp = wheadp; nwp != NULL; nwp = nwp->w_wndp)
		if (nwp->w_wndp == wp) {
			nwp->w_wndp = wp->w_wndp;
			break;
		}
	free(wp);
	return (TRUE);
}