/*	$OpenBSD: soelim.c,v 1.7 2003/06/10 22:20:51 deraadt Exp $	*/
/*	$NetBSD: soelim.c,v 1.3 1994/12/21 08:11:26 jtc 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)soelim.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: soelim.c,v 1.7 2003/06/10 22:20:51 deraadt Exp $";
#endif /* not lint */

#include <stdio.h>
/*
 * soelim - a filter to process n/troff input eliminating .so's
 *
 * Author: Bill Joy UCB July 8, 1977
 *
 * This program eliminates .so's from a n/troff input stream.
 * It can be used to prepare safe input for submission to the
 * phototypesetter since the software supporting the operator
 * doesn't let him do chdir.
 *
 * This is a kludge and the operator should be given the
 * ability to do chdir.
 *
 * This program is more generally useful, it turns out, because
 * the program tbl doesn't understand ".so" directives.
 */
#define	STDIN_NAME	"-"

int process(char *file);

int
main(int argc, char *argv[])
{

	argc--;
	argv++;
	if (argc == 0) {
		(void)process(STDIN_NAME);
		exit(0);
	}
	do {
		(void)process(argv[0]);
		argv++;
		argc--;
	} while (argc > 0);
	exit(0);
}

int
process(char *file)
{
	char *cp;
	int c;
	char fname[BUFSIZ];
	FILE *soee;
	int isfile;

	if (!strcmp(file, STDIN_NAME)) {
		soee = stdin;
	} else {
		soee = fopen(file, "r");
		if (soee == NULL) {
			perror(file);
			return(-1);
		}
	}
	for (;;) {
		c = getc(soee);
		if (c == EOF)
			break;
		if (c != '.')
			goto simple;
		c = getc(soee);
		if (c != 's') {
			putchar('.');
			goto simple;
		}
		c = getc(soee);
		if (c != 'o') {
			printf(".s");
			goto simple;
		}
		do
			c = getc(soee);
		while (c == ' ' || c == '\t');
		cp = fname;
		isfile = 0;
		for (;;) {
			switch (c) {

			case ' ':
			case '\t':
			case '\n':
			case EOF:
				goto donename;

			default:
				*cp++ = c;
				c = getc(soee);
				isfile++;
				continue;
			}
		}
donename:
		if (cp == fname) {
			printf(".so");
			goto simple;
		}
		*cp = 0;
		if (process(fname) < 0)
			if (isfile)
				printf(".so %s\n", fname);
		continue;
simple:
		if (c == EOF)
			break;
		putchar(c);
		if (c != '\n') {
			c = getc(soee);
			goto simple;
		}
	}
	if (soee != stdin) {
		fclose(soee);
	}
	return(0);
}