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utmp.c revision 1.7 
      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