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warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant).  These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

/*	$OpenBSD: uniq.c,v 1.6 2000/06/30 16:00:22 millert Exp $	*/
/*	$NetBSD: uniq.c,v 1.7 1995/08/31 22:03:48 jtc Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Case Larsen.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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) 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)uniq.c	8.3 (Berkeley) 5/4/95";
#endif
static char rcsid[] = "$OpenBSD: uniq.c,v 1.6 2000/06/30 16:00:22 millert Exp $";
#endif /* not lint */

#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>

#define	MAXLINELEN	(8 * 1024)

int cflag, dflag, uflag;
int numchars, numfields, repeats;

FILE	*file __P((char *, char *));
void	 show __P((FILE *, char *));
char	*skip __P((char *));
void	 obsolete __P((char *[]));
void	 usage __P((void));

int
main (argc, argv)
	int argc;
	char *argv[];
{
	register char *t1, *t2;
	FILE *ifp, *ofp;
	int ch;
	char *prevline, *thisline, *p;

	obsolete(argv);
	while ((ch = getopt(argc, argv, "-cdf:s:u")) != -1)
		switch (ch) {
		case '-':
			--optind;
			goto done;
		case 'c':
			cflag = 1;
			break;
		case 'd':
			dflag = 1;
			break;
		case 'f':
			numfields = strtol(optarg, &p, 10);
			if (numfields < 0 || *p)
				errx(1, "illegal field skip value: %s", optarg);
			break;
		case 's':
			numchars = strtol(optarg, &p, 10);
			if (numchars < 0 || *p)
				errx(1, "illegal character skip value: %s", optarg);
			break;
		case 'u':
			uflag = 1;
			break;
		case '?':
		default:
			usage();
	}

done:	argc -= optind;
	argv +=optind;

	/* If no flags are set, default is -d -u. */
	if (cflag) {
		if (dflag || uflag)
			usage();
	} else if (!dflag && !uflag)
		dflag = uflag = 1;

	switch(argc) {
	case 0:
		ifp = stdin;
		ofp = stdout;
		break;
	case 1:
		ifp = file(argv[0], "r");
		ofp = stdout;
		break;
	case 2:
		ifp = file(argv[0], "r");
		ofp = file(argv[1], "w");
		break;
	default:
		usage();
	}

	prevline = malloc(MAXLINELEN);
	thisline = malloc(MAXLINELEN);
	if (prevline == NULL || thisline == NULL)
		err(1, "malloc");

	if (fgets(prevline, MAXLINELEN, ifp) == NULL)
		exit(0);

	while (fgets(thisline, MAXLINELEN, ifp)) {
		/* If requested get the chosen fields + character offsets. */
		if (numfields || numchars) {
			t1 = skip(thisline);
			t2 = skip(prevline);
		} else {
			t1 = thisline;
			t2 = prevline;
		}

		/* If different, print; set previous to new value. */
		if (strcmp(t1, t2)) {
			show(ofp, prevline);
			t1 = prevline;
			prevline = thisline;
			thisline = t1;
			repeats = 0;
		} else
			++repeats;
	}
	show(ofp, prevline);
	exit(0);
}

/*
 * show --
 *	Output a line depending on the flags and number of repetitions
 *	of the line.
 */
void
show(ofp, str)
	FILE *ofp;
	char *str;
{

	if (cflag && *str)
		(void)fprintf(ofp, "%4d %s", repeats + 1, str);
	if (dflag && repeats || uflag && !repeats)
		(void)fprintf(ofp, "%s", str);
}

char *
skip(str)
	register char *str;
{
	register int infield, nchars, nfields;

	for (nfields = numfields, infield = 0; nfields && *str; ++str)
		if (isspace(*str)) {
			if (infield) {
				infield = 0;
				--nfields;
			}
		} else if (!infield)
			infield = 1;
	for (nchars = numchars; nchars-- && *str; ++str);
	return(str);
}

FILE *
file(name, mode)
	char *name, *mode;
{
	FILE *fp;

	if ((fp = fopen(name, mode)) == NULL)
		err(1, "%s", name);
	return(fp);
}

void
obsolete(argv)
	char *argv[];
{
	int len;
	char *ap, *p, *start;

	while (ap = *++argv) {
		/* Return if "--" or not an option of any form. */
		if (ap[0] != '-') {
			if (ap[0] != '+')
				return;
		} else if (ap[1] == '-')
			return;
		if (!isdigit(ap[1]))
			continue;
		/*
		 * Digit signifies an old-style option.  Malloc space for dash,
		 * new option and argument.
		 */
		len = strlen(ap);
		if ((start = p = malloc(len + 3)) == NULL)
			err(1, "malloc");
		*p++ = '-';
		*p++ = ap[0] == '+' ? 's' : 'f';
		(void)strcpy(p, ap + 1);
		*argv = start;
	}
}

void
usage()
{
	(void)fprintf(stderr,
	    "usage: uniq [-c | -du] [-f fields] [-s chars] [input [output]]\n");
	exit(1);
}