1 /* $NetBSD: utmp.c,v 1.5 2002/11/17 20:49:33 itojun 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 1.5 2002/11/17 20:49:33 itojun Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <time.h> 49 #include <utmp.h> 50 51 static struct utmp utmp; 52 static FILE *ut; 53 static char utfile[MAXPATHLEN] = _PATH_UTMP; 54 55 void 56 setutent(void) 57 { 58 if (ut == NULL) 59 return; 60 (void)fseeko(ut, (off_t)0, SEEK_SET); 61 } 62 63 struct utmp * 64 getutent(void) 65 { 66 if (ut == NULL) { 67 if ((ut = fopen(utfile, "r")) == NULL) 68 return NULL; 69 } 70 if (fread(&utmp, sizeof(utmp), 1, ut) == 1) 71 return &utmp; 72 return NULL; 73 } 74 75 void 76 endutent(void) 77 { 78 if (ut != NULL) { 79 (void)fclose(ut); 80 ut = NULL; 81 } 82 } 83 84 int 85 utmpname(const char *fname) 86 { 87 size_t len = strlen(fname); 88 89 if (len >= sizeof(utfile)) 90 return 0; 91 92 /* must not end in x! */ 93 if (fname[len - 1] == 'x') 94 return 0; 95 96 (void)strlcpy(utfile, fname, sizeof(utfile)); 97 endutent(); 98 return 1; 99 } 100