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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* tty -- print the path of the terminal connected to standard input
Copyright (C) 90,91,92,93,94,95,96,1997 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. */
/* Displays "not a tty" if stdin is not a terminal.
Displays nothing if -s option is given.
Exit status 0 if stdin is a tty, 1 if not, 2 if usage error,
3 if write error.
Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
static void usage PARAMS ((int status));
/* The name under which this program was run. */
char *program_name;
/* If nonzero, return an exit status but produce no output. */
static int silent;
/* 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 longopts[] =
{
{"help", no_argument, &show_help, 1},
{"silent", no_argument, NULL, 's'},
{"quiet", no_argument, NULL, 's'},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
int
main (int argc, char **argv)
{
char *tty;
int optc;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
silent = 0;
while ((optc = getopt_long (argc, argv, "s", longopts, NULL)) != -1)
{
switch (optc)
{
case 0:
break;
case 's':
silent = 1;
break;
default:
usage (2);
}
}
if (show_version)
{
printf ("tty (%s) %s\n", GNU_PACKAGE, VERSION);
exit (0);
}
if (show_help)
usage (0);
if (optind != argc)
usage (2);
tty = ttyname (0);
if (!silent)
{
if (tty)
puts (tty);
else
puts (_("not a tty"));
if (ferror (stdout) || fclose (stdout) == EOF)
error (3, errno, _("standard output"));
}
exit (isatty (0) ? 0 : 1);
}
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 file name of the terminal connected to standard input.\n\
\n\
-s, --silent, --quiet print nothing, only return an exit status\n\
--help display this help and exit\n\
--version output version information and exit\n\
"));
puts (_("\nReport bugs to <sh-utils-bugs@gnu.org>."));
}
exit (status);
}
|
