1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#include <string.h>
29#include <stdio.h>
30#include <utmp.h>
31
32
33void pututline(struct utmp* utmp)
34{
35    FILE* f;
36    struct utmp u;
37    long i;
38
39    if (!(f = fopen(_PATH_UTMP, "w+e")))
40        return;
41
42    while (fread(&u, sizeof(struct utmp), 1, f) == 1)
43    {
44        if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) -1))
45        {
46            if ((i = ftell(f)) < 0)
47                goto ret;
48            if (fseek(f, i - sizeof(struct utmp), SEEK_SET) < 0)
49                goto ret;
50            fwrite(utmp, sizeof(struct utmp), 1, f);
51            goto ret;
52        }
53    }
54
55
56    fclose(f);
57
58    if (!(f = fopen(_PATH_UTMP, "w+e")))
59        return;
60    fwrite(utmp, sizeof(struct utmp), 1, f);
61
62ret:
63    fclose(f);
64}
65