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      1 /*	$NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1987, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\
     35  The Regents of the University of California.  All rights reserved.");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)users.c	8.1 (Berkeley) 6/6/93";
     41 #endif
     42 __RCSID("$NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan Exp $");
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 
     47 #include <err.h>
     48 #include <time.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 
     54 #include "utmpentry.h"
     55 
     56 int
     57 main(int argc, char **argv)
     58 {
     59 	int ncnt = 0;
     60 	int ch;
     61 	struct utmpentry *from, *ehead, *save, **nextp;
     62 
     63 	while ((ch = getopt(argc, argv, "")) != -1)
     64 		switch(ch) {
     65 		case '?':
     66 		default:
     67 			(void)fprintf(stderr, "usage: %s\n", getprogname());
     68 			exit(1);
     69 		}
     70 	argc -= optind;
     71 	argv += optind;
     72 
     73 	ncnt = getutentries(NULL, &ehead);
     74 
     75 	if (ncnt == 0)
     76 		return 0;
     77 
     78 	/*
     79 	 * XXX the utmp list belongs to getutentries and we shouldn't
     80 	 * sort it in place. Since we don't call endutentries and we
     81 	 * don't call getutentries again it doesn't matter, but it's
     82 	 * untidy. Maybe give getutentries a sort function? It has to
     83 	 * sort anyway if it's merging utmp and utmpx data.
     84 	 */
     85 
     86 	from = ehead;
     87 	ehead = NULL;
     88 	while (from != NULL) {
     89 		for (nextp = &ehead;
     90 		    (*nextp) && strcmp(from->name, (*nextp)->name) > 0;
     91 		    nextp = &(*nextp)->next)
     92 			continue;
     93 		save = from;
     94 		from = from->next;
     95 		save->next = *nextp;
     96 		*nextp = save;
     97 	}
     98 
     99 	save = ehead;
    100 	(void)printf("%s", ehead->name);
    101 
    102 	for (from = ehead->next; from; from = from->next)
    103 		if (strcmp(save->name, from->name) != 0) {
    104 			(void)printf(" %s", from->name);
    105 			save = from;
    106 		}
    107 
    108 	(void)printf("\n");
    109 	exit(0);
    110 }
    111