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