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utmp.c revision 1.3 
      1 /*	$NetBSD: utmp.c,v 1.3 2002/07/28 21:46:03 christos 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 1.3 2002/07/28 21:46:03 christos 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 <time.h>
     48 #include <utmp.h>
     49 
     50 static struct utmp utmp;
     51 static FILE *ut;
     52 static char utfile[MAXPATHLEN] = _PATH_UTMP;
     53 
     54 void
     55 setutent(void)
     56 {
     57 	if (ut == NULL)
     58 		return;
     59 	(void)fseeko(ut, (off_t)0, SEEK_SET);
     60 }
     61 
     62 struct utmp *
     63 getutent(void)
     64 {
     65 	if (ut == NULL) {
     66 		if ((ut = fopen(utfile, "r")) == NULL)
     67 			return NULL;
     68 	}
     69 	if (fread(&utmp, sizeof(utmp), 1, ut) == 1)
     70 		return &utmp;
     71 	return NULL;
     72 }
     73 
     74 void
     75 endutent(void)
     76 {
     77 	if (ut != NULL) {
     78 		(void)fclose(ut);
     79 		ut = NULL;
     80 	}
     81 }
     82 
     83 int
     84 utmpname(const char *fname)
     85 {
     86 	size_t len = strlen(fname);
     87 
     88 	if (len >= sizeof(utfile))
     89 		return 0;
     90 
     91 	/* must not end in x! */
     92 	if (fname[len - 1] == 'x')
     93 		return 0;
     94 
     95 	(void)strcpy(utfile, fname);
     96 	endutent();
     97 	return 1;
     98 }
     99