1 /* $NetBSD: utmp.c,v 1.7 2008/04/28 20:22:59 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: utmp.c,v 1.7 2008/04/28 20:22:59 martin Exp $"); 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include "namespace.h" 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <time.h> 43 #include <utmp.h> 44 45 static struct utmp utmp; 46 static FILE *ut; 47 static char utfile[MAXPATHLEN] = _PATH_UTMP; 48 49 void 50 setutent(void) 51 { 52 if (ut == NULL) 53 return; 54 (void)fseeko(ut, (off_t)0, SEEK_SET); 55 } 56 57 struct utmp * 58 getutent(void) 59 { 60 if (ut == NULL) { 61 if ((ut = fopen(utfile, "r")) == NULL) 62 return NULL; 63 } 64 if (fread(&utmp, sizeof(utmp), 1, ut) == 1) 65 return &utmp; 66 return NULL; 67 } 68 69 void 70 endutent(void) 71 { 72 if (ut != NULL) { 73 (void)fclose(ut); 74 ut = NULL; 75 } 76 } 77 78 int 79 utmpname(const char *fname) 80 { 81 size_t len = strlen(fname); 82 83 if (len >= sizeof(utfile)) 84 return 0; 85 86 /* must not end in x! */ 87 if (fname[len - 1] == 'x') 88 return 0; 89 90 (void)strlcpy(utfile, fname, sizeof(utfile)); 91 endutent(); 92 return 1; 93 } 94