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users.c revision 1.13 
      1 /*	$NetBSD: users.c,v 1.13 2004/01/05 23:23:37 jmmv 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\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     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 1.13 2004/01/05 23:23:37 jmmv 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	main __P((int, char **));
     57 
     58 int
     59 main(argc, argv)
     60 	int argc;
     61 	char **argv;
     62 {
     63 	int ncnt = 0;
     64 	int ch;
     65 	struct utmpentry *from, *ehead, *save, **nextp;
     66 
     67 	while ((ch = getopt(argc, argv, "")) != -1)
     68 		switch(ch) {
     69 		case '?':
     70 		default:
     71 			(void)fprintf(stderr, "usage: %s\n", getprogname());
     72 			exit(1);
     73 		}
     74 	argc -= optind;
     75 	argv += optind;
     76 
     77 	ncnt = getutentries(NULL, &ehead);
     78 
     79 	if (ncnt == 0)
     80 		return 0;
     81 
     82 	from = ehead;
     83 	ehead = NULL;
     84 	while (from != NULL) {
     85 		for (nextp = &ehead;
     86 		    (*nextp) && strcmp(from->name, (*nextp)->name) > 0;
     87 		    nextp = &(*nextp)->next)
     88 			continue;
     89 		save = from;
     90 		from = from->next;
     91 		save->next = *nextp;
     92 		*nextp = save;
     93 	}
     94 
     95 	save = ehead;
     96 	(void)printf("%s", ehead->name);
     97 
     98 	for (from = ehead->next; from; from = from->next)
     99 		if (strcmp(save->name, from->name) != 0) {
    100 			(void)printf(" %s", from->name);
    101 			save = from;
    102 		}
    103 
    104 	(void)printf("\n");
    105 	exit(0);
    106 }
    107