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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: colcrt.c,v 1.10 2009/10/27 23:59:36 deraadt Exp $	*/
/*	$NetBSD: colcrt.c,v 1.3 1995/03/26 05:31:00 glass Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	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. 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 <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <err.h>

/*
 * colcrt - replaces col for crts with new nroff esp. when using tbl.
 * Bill Joy UCB July 14, 1977
 *
 * This filter uses a screen buffer, 267 half-lines by 132 columns.
 * It interprets the up and down sequences generated by the new
 * nroff when used with tbl and by \u \d and \r.
 * General overstriking doesn't work correctly.
 * Underlining is split onto multiple lines, etc.
 *
 * Option - suppresses all underlining.
 * Option -2 forces printing of all half lines.
 */

char	page[267][132];

int	outline = 1;
int	outcol;

char	suppresul;
char	printall;

FILE	*f;

void	pflush(int);
int	plus(char, char);
void	move(int, int);

int
main(int argc, char *argv[])
{
	extern char *__progname;
	char *cp, *dp;
	int c;

	argc--;
	argv++;
	while (argc > 0 && argv[0][0] == '-') {
		switch (argv[0][1]) {
			case 0:
				suppresul = 1;
				break;
			case '2':
				printall = 1;
				break;
			default:
				fprintf(stderr,
				    "usage: %s [-] [-2] [file ...]\n",
				    __progname);
				fflush(stdout);
				exit(1);
		}
		argc--;
		argv++;
	}
	do {
		if (argc > 0) {
			close(0);
			if (!(f = fopen(argv[0], "r"))) {
				fflush(stdout);
				err(1, "fopen: %s", argv[0]);
			}
			argc--;
			argv++;
		}
		for (;;) {
			c = getc(stdin);
			if (c == -1) {
				pflush(outline);
				fflush(stdout);
				break;
			}
			switch (c) {
				case '\n':
					if (outline >= 265)
						pflush(62);
					outline += 2;
					outcol = 0;
					continue;
				case '\016':
					case '\017':
					continue;
				case 033:
					c = getc(stdin);
					switch (c) {
						case '9':
							if (outline >= 266)
								pflush(62);
							outline++;
							continue;
						case '8':
							if (outline >= 1)
								outline--;
							continue;
						case '7':
							outline -= 2;
							if (outline < 0)
								outline = 0;
							continue;
						default:
							continue;
					}
				case '\b':
					if (outcol)
						outcol--;
					continue;
				case '\t':
					outcol += 8;
					outcol &= ~7;
					outcol--;
					c = ' ';
				default:
					if (outcol >= 132) {
						outcol++;
						continue;
					}
					cp = &page[outline][outcol];
					outcol++;
					if (c == '_') {
						if (suppresul)
							continue;
						cp += 132;
						c = '-';
					}
					if (*cp == 0) {
						*cp = c;
						dp = cp - outcol;
						for (cp--; cp >= dp && *cp == 0; cp--)
							*cp = ' ';
					} else
						if (plus(c, *cp) || plus(*cp, c))
							*cp = '+';
						else if (*cp == ' ' || *cp == 0)
							*cp = c;
					continue;
			}
		}
	} while (argc > 0);
	fflush(stdout);
	exit(0);
}

int
plus(char c, char d)
{

	return ((c == '|' && d == '-') || d == '_');
}

int first;

void
pflush(int ol)
{
	int i;
	char *cp;
	char lastomit;
	int l;

	l = ol;
	lastomit = 0;
	if (l > 266)
		l = 266;
	else
		l |= 1;
	for (i = first | 1; i < l; i++) {
		move(i, i - 1);
		move(i, i + 1);
	}
	for (i = first; i < l; i++) {
		cp = page[i];
		if (printall == 0 && lastomit == 0 && *cp == 0) {
			lastomit = 1;
			continue;
		}
		lastomit = 0;
		printf("%s\n", cp);
	}
	bcopy(page[ol], page, (267 - ol) * 132);
	bzero(page[267- ol], ol * 132);
	outline -= ol;
	outcol = 0;
	first = 1;
}

void
move(int l, int m)
{
	char *cp, *dp;

	for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
		switch (*cp) {
			case '|':
				if (*dp != ' ' && *dp != '|' && *dp != 0)
					return;
				break;
			case ' ':
				break;
			default:
				return;
		}
	}
	if (*cp == 0) {
		for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
			if (*cp == '|')
				*dp = '|';
			else if (*dp == 0)
				*dp = ' ';
		page[l][0] = 0;
	}
}