1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* GNU's read utmp module.
Copyright (C) 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by jla; revised by djm */
#include <config.h>
#include <sys/stat.h>
#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
# include <string.h>
#else
# include <strings.h>
#endif /* STDC_HEADERS || HAVE_STRING_H */
#include "readutmp.h"
char *xmalloc ();
/* Copy UT->ut_name into storage obtained from malloc. Then remove any
trailing spaces from the copy, NUL terminate it, and return the copy. */
char *
extract_trimmed_name (ut)
const STRUCT_UTMP *ut;
{
char *p, *trimmed_name;
trimmed_name = xmalloc (sizeof (ut->ut_name) + 1);
strncpy (trimmed_name, ut->ut_name, sizeof (ut->ut_name));
/* Append a trailing space character. Some systems pad names shorter than
the maximum with spaces, others pad with NULs. Remove any spaces. */
trimmed_name[sizeof (ut->ut_name)] = ' ';
p = strchr (trimmed_name, ' ');
if (p != NULL)
*p = '\0';
return trimmed_name;
}
/* Read the utmp file FILENAME into *UTMP_BUF, set *N_ENTRIES to the
number of entries read, and return zero. If there is any error,
return non-zero and don't modify the parameters. */
int
read_utmp (filename, n_entries, utmp_buf)
const char *filename;
int *n_entries;
STRUCT_UTMP **utmp_buf;
{
FILE *utmp;
struct stat file_stats;
size_t n_read;
size_t size;
STRUCT_UTMP *buf;
utmp = fopen (filename, "r");
if (utmp == NULL)
return 1;
fstat (fileno (utmp), &file_stats);
size = file_stats.st_size;
if (size > 0)
buf = (STRUCT_UTMP *) xmalloc (size);
else
{
fclose (utmp);
return 1;
}
/* Use < instead of != in case the utmp just grew. */
n_read = fread (buf, 1, size, utmp);
if (ferror (utmp) || fclose (utmp) == EOF
|| n_read < size)
return 1;
*n_entries = size / sizeof (STRUCT_UTMP);
*utmp_buf = buf;
return 0;
}
|
