1 /*-
2 * Copyright (c) 2002 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Christos Zoulas.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the NetBSD
19 * Foundation, Inc. and its contributors.
20 * 4. Neither the name of The NetBSD Foundation nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36 #include <sys/cdefs.h>
37
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
setutent(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 *
getutent(void)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
endutent(void)70 endutent(void)
71 {
72 if (ut != NULL) {
73 (void)fclose(ut);
74 ut = NULL;
75 }
76 }
77
78 int
utmpname(const char * fname)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