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users.c revision 1.10 
      1 /*	$NetBSD: users.c,v 1.10 2002/08/01 23:51:20 christos 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)users.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: users.c,v 1.10 2002/08/01 23:51:20 christos Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 
     51 #include <err.h>
     52 #include <time.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <unistd.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include "utmpentry.h"
     60 
     61 int	main __P((int, char **));
     62 
     63 int
     64 main(argc, argv)
     65 	int argc;
     66 	char **argv;
     67 {
     68 	int ncnt = 0;
     69 	int ch;
     70 	struct utmpentry *from, *ehead, *save, **nextp;
     71 
     72 	while ((ch = getopt(argc, argv, "")) != -1)
     73 		switch(ch) {
     74 		case '?':
     75 		default:
     76 			(void)fprintf(stderr, "Usage: %s\n", getprogname());
     77 			exit(1);
     78 		}
     79 	argc -= optind;
     80 	argv += optind;
     81 
     82 	ncnt = getutentries(NULL, &ehead);
     83 
     84 	if (ncnt == 0)
     85 		return 0;
     86 
     87 	from = ehead;
     88 	ehead = NULL;
     89 	while (from != NULL) {
     90 		for (nextp = &ehead;
     91 		    (*nextp) && strcmp(from->name, (*nextp)->name) > 0;
     92 		    nextp = &(*nextp)->next)
     93 			continue;
     94 		save = from;
     95 		from = from->next;
     96 		save->next = *nextp;
     97 		*nextp = save;
     98 	}
     99 
    100 	save = ehead;
    101 	(void)printf("%s", ehead->name);
    102 
    103 	for (from = ehead->next; from; from = from->next)
    104 		if (strcmp(save->name, from->name) != 0) {
    105 			(void)printf(" %s", from->name);
    106 			save = from;
    107 		}
    108 
    109 	(void)printf("\n");
    110 	exit(0);
    111 }
    112