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
94
95
96
97
98
99
100
101
102
103
|
/* logname -- print user's login name
Copyright (C) 90, 91, 92, 93, 94, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <getopt.h>
#include "version.h"
#include "system.h"
/* The name this program was run with. */
char *program_name;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output and exit. */
static int show_version;
static struct option const long_options[] =
{
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{0, 0, 0, 0}
};
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]...\n"), program_name);
printf (_("\
Print the name of the current user.\n\
\n\
--help display this help and exit\n\
--version output version information and exit\n\
"));
}
exit (status);
}
void
main (int argc, char **argv)
{
register char *cp;
int c;
program_name = argv[0];
while ((c = getopt_long (argc, argv, "", long_options, (int *) 0)) != EOF)
{
switch (c)
{
case 0:
break;
default:
usage (1);
}
}
if (show_version)
{
printf ("logname - %s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (argc - optind != 0)
usage (1);
/* POSIX.2 requires using getlogin (or equivalent code). */
cp = getlogin ();
if (cp)
{
puts (cp);
exit (0);
}
/* POSIX.2 prohibits using a fallback technique. */
fprintf (stderr,_("%s: no login name\n"), argv[0]);
exit (1);
}
|
