1 /* $NetBSD: users.c,v 1.16 2012/03/20 20:34:59 matt 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 1.16 2012/03/20 20:34:59 matt 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(int, char **); 57 58 int 59 main(int argc, char **argv) 60 { 61 int ncnt = 0; 62 int ch; 63 struct utmpentry *from, *ehead, *save, **nextp; 64 65 while ((ch = getopt(argc, argv, "")) != -1) 66 switch(ch) { 67 case '?': 68 default: 69 (void)fprintf(stderr, "usage: %s\n", getprogname()); 70 exit(1); 71 } 72 argc -= optind; 73 argv += optind; 74 75 ncnt = getutentries(NULL, &ehead); 76 77 if (ncnt == 0) 78 return 0; 79 80 /* 81 * XXX the utmp list belongs to getutentries and we shouldn't 82 * sort it in place. Since we don't call endutentries and we 83 * don't call getutentries again it doesn't matter, but it's 84 * untidy. Maybe give getutentries a sort function? It has to 85 * sort anyway if it's merging utmp and utmpx data. 86 */ 87 88 from = ehead; 89 ehead = NULL; 90 while (from != NULL) { 91 for (nextp = &ehead; 92 (*nextp) && strcmp(from->name, (*nextp)->name) > 0; 93 nextp = &(*nextp)->next) 94 continue; 95 save = from; 96 from = from->next; 97 save->next = *nextp; 98 *nextp = save; 99 } 100 101 save = ehead; 102 (void)printf("%s", ehead->name); 103 104 for (from = ehead->next; from; from = from->next) 105 if (strcmp(save->name, from->name) != 0) { 106 (void)printf(" %s", from->name); 107 save = from; 108 } 109 110 (void)printf("\n"); 111 exit(0); 112 } 113