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