1 /* 2 * Copyright (c) 1980, 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1980, 1987, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)users.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.bin/users/users.c,v 1.8 2002/09/04 23:29:09 dwmalone Exp $ 36 * $DragonFly: src/usr.bin/users/users.c,v 1.5 2007/10/02 16:38:10 swildner Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <err.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include "utmpentry.h" 46 47 typedef char namebuf[32]; 48 49 static int scmp(const void *, const void *); 50 static void usage(void); 51 52 int 53 main(int argc, char **argv) 54 { 55 struct utmpentry *ep; 56 namebuf *names = NULL; 57 int ncnt = 0; 58 int nmax = 0; 59 int cnt; 60 int ch; 61 62 while ((ch = getopt(argc, argv, "")) != -1) { 63 switch(ch) { 64 default: 65 usage(); 66 } 67 } 68 argc -= optind; 69 argv += optind; 70 71 getutentries(NULL, &ep); 72 for (; ep; ep = ep->next) { 73 if (ncnt >= nmax) { 74 nmax += 32; 75 names = realloc(names, 76 sizeof (*names) * nmax); 77 if (names == NULL) 78 err(1, "realloc"); 79 } 80 strcpy(names[ncnt], ep->name); 81 ++ncnt; 82 } 83 if (ncnt) { 84 qsort(names, ncnt, 32, scmp); 85 printf("%.*s", 32, names[0]); 86 for (cnt = 1; cnt < ncnt; ++cnt) { 87 if (strcmp(names[cnt], names[cnt - 1])) 88 printf(" %.*s", 32, names[cnt]); 89 } 90 printf("\n"); 91 } 92 exit(0); 93 } 94 95 static void 96 usage(void) 97 { 98 fprintf(stderr, "usage: users\n"); 99 exit(1); 100 } 101 102 int 103 scmp(const void *p, const void *q) 104 { 105 return(strncmp(p, q, 32)); 106 } 107