1 /* $NetBSD: utmp.c,v 1.6 2004/05/09 11:25:52 kleink Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 #include <sys/cdefs.h> 39 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: utmp.c,v 1.6 2004/05/09 11:25:52 kleink Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 #include <sys/types.h> 46 #include <sys/param.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <time.h> 50 #include <utmp.h> 51 52 static struct utmp utmp; 53 static FILE *ut; 54 static char utfile[MAXPATHLEN] = _PATH_UTMP; 55 56 void 57 setutent(void) 58 { 59 if (ut == NULL) 60 return; 61 (void)fseeko(ut, (off_t)0, SEEK_SET); 62 } 63 64 struct utmp * 65 getutent(void) 66 { 67 if (ut == NULL) { 68 if ((ut = fopen(utfile, "r")) == NULL) 69 return NULL; 70 } 71 if (fread(&utmp, sizeof(utmp), 1, ut) == 1) 72 return &utmp; 73 return NULL; 74 } 75 76 void 77 endutent(void) 78 { 79 if (ut != NULL) { 80 (void)fclose(ut); 81 ut = NULL; 82 } 83 } 84 85 int 86 utmpname(const char *fname) 87 { 88 size_t len = strlen(fname); 89 90 if (len >= sizeof(utfile)) 91 return 0; 92 93 /* must not end in x! */ 94 if (fname[len - 1] == 'x') 95 return 0; 96 97 (void)strlcpy(utfile, fname, sizeof(utfile)); 98 endutent(); 99 return 1; 100 } 101