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This diff is rather large, but it's just simply removing unnecessary headers
, remove some lint-style comments, add missing void to functions without args,
also some function prototypes (extern) were missing their args, so I added them
as they were defined in hack.h

OK tb@ on separate diffs

/*	$OpenBSD: hack.topl.c,v 1.12 2016/01/09 18:33:15 mestre Exp $	*/

/*
 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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.
 */

/*
 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
 * 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. The name of the author 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 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 AUTHOR 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 <stdio.h>
#include <stdlib.h>

#include "hack.h"

extern int CO;

char toplines[BUFSZ];
xchar tlx, tly;			/* set by pline; used by addtopl */

struct topl {
	struct topl *next_topl;
	char *topl_text;
} *old_toplines, *last_redone_topl;
#define	OTLMAX	20		/* max nr of old toplines remembered */

static void redotoplin(void);
static void xmore(char *);


int
doredotopl(void)
{
	if(last_redone_topl)
		last_redone_topl = last_redone_topl->next_topl;
	if(!last_redone_topl)
		last_redone_topl = old_toplines;
	if(last_redone_topl){
		(void) strlcpy(toplines, last_redone_topl->topl_text, sizeof toplines);
	}
	redotoplin();
	return(0);
}

static void
redotoplin(void)
{
	home();
	if(strchr(toplines, '\n')) cl_end();
	putstr(toplines);
	cl_end();
	tlx = curx;
	tly = cury;
	flags.toplin = 1;
	if(tly > 1)
		more();
}

void
remember_topl(void)
{
	struct topl *tl;
	int cnt = OTLMAX;
	size_t slen;

	if(last_redone_topl &&
	   !strcmp(toplines, last_redone_topl->topl_text)) return;
	if(old_toplines &&
	   !strcmp(toplines, old_toplines->topl_text)) return;
	last_redone_topl = 0;
	slen = strlen(toplines) + 1;
	tl = (struct topl *)
		alloc(sizeof(struct topl) + slen);
	tl->next_topl = old_toplines;
	tl->topl_text = (char *)(tl + 1);
	(void) strlcpy(tl->topl_text, toplines, slen);
	old_toplines = tl;
	while(cnt && tl){
		cnt--;
		tl = tl->next_topl;
	}
	if(tl && tl->next_topl){
		free(tl->next_topl);
		tl->next_topl = 0;
	}
}

void
addtopl(char *s)
{
	curs(tlx,tly);
	if(tlx + strlen(s) > CO) putsym('\n');
	putstr(s);
	tlx = curx;
	tly = cury;
	flags.toplin = 1;
}

static void
xmore(char *s)
{
	if(flags.toplin) {
		curs(tlx, tly);
		if(tlx + 8 > CO) putsym('\n'), tly++;
	}

	if(flags.standout)
		standoutbeg();
	putstr("--More--");
	if(flags.standout)
		standoutend();

	xwaitforspace(s);
	if(flags.toplin && tly > 1) {
		home();
		cl_end();
		docorner(1, tly-1);
	}
	flags.toplin = 0;
}

void
more(void)
{
	xmore("");
}

void
cmore(char *s)
{
	xmore(s);
}

void
clrlin(void)
{
	if(flags.toplin) {
		home();
		cl_end();
		if(tly > 1) docorner(1, tly-1);
		remember_topl();
	}
	flags.toplin = 0;
}

void
pline(const char *line, ...)
{
	va_list ap;

	va_start(ap, line);
	vpline(line, ap);
	va_end(ap);
}

void
vpline(const char *line, va_list ap)
{
	char pbuf[BUFSZ];
	char *bp = pbuf, *tl;
	int n,n0;

	if(!line || !*line) return;
	(void) vsnprintf(pbuf, sizeof pbuf, line, ap);
	if(flags.toplin == 1 && !strcmp(pbuf, toplines)) return;
	nscr();		/* %% */

	/* If there is room on the line, print message on same line */
	/* But messages like "You die..." deserve their own line */
	n0 = strlen(bp);
	if(flags.toplin == 1 && tly == 1 &&
	    n0 + strlen(toplines) + 3 < CO-8 &&  /* leave room for --More-- */
	    strncmp(bp, "You ", 4)) {
		(void) strlcat(toplines, "  ", sizeof toplines);
		(void) strlcat(toplines, bp, sizeof toplines);
		tlx += 2;
		addtopl(bp);
		return;
	}
	if(flags.toplin == 1) more();
	remember_topl();
	toplines[0] = 0;
	while(n0){
		if(n0 >= CO){
			/* look for appropriate cut point */
			n0 = 0;
			for(n = 0; n < CO; n++) if(bp[n] == ' ')
				n0 = n;
			if(!n0) for(n = 0; n < CO-1; n++)
				if(!letter(bp[n])) n0 = n;
			if(!n0) n0 = CO-2;
		}
		(void) strncpy((tl = eos(toplines)), bp, n0);
		tl[n0] = '\0';
		bp += n0;

		/* remove trailing spaces, but leave one */
		while(n0 > 1 && tl[n0-1] == ' ' && tl[n0-2] == ' ')
			tl[--n0] = 0;

		n0 = strlen(bp);
		if(n0 && tl[0])
			(void) strlcat(tl, "\n",
			    toplines + sizeof toplines - tl);
	}
	redotoplin();
}

void
putsym(char c)
{
	switch(c) {
	case '\b':
		backsp();
		return;
	case '\n':
		curx = 1;
		cury++;
		if(cury > tly) tly = cury;
		break;
	default:
		if(curx == CO)
			putsym('\n');	/* 1 <= curx <= CO; avoid CO */
		else
			curx++;
	}
	(void) putchar(c);
}

void
putstr(char *s)
{
	while(*s) putsym(*s++);
}