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
|
/* Copyright (C) 1992,93,94,95,96,97,98,99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
/* It is desirable to use this bit on systems that have it.
The only bit of terminal state we want to twiddle is echoing, which is
done in software; there is no need to change the state of the terminal
hardware. */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif
#define PWD_BUFFER_SIZE 256
char *
getpass (prompt)
const char *prompt;
{
FILE *in, *out;
struct termios s, t;
int tty_changed;
static char buf[PWD_BUFFER_SIZE];
int nread;
/* Try to write to and read from the terminal if we can.
If we can't open the terminal, use stderr and stdin. */
in = fopen ("/dev/tty", "r+");
if (in == NULL)
{
in = stdin;
out = stderr;
}
else
out = in;
/* Turn echoing off if it is on now. */
if (tcgetattr (fileno (in), &t) == 0)
{
/* Save the old one. */
s = t;
/* Tricky, tricky. */
t.c_lflag &= ~(ECHO|ISIG);
tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
/* Disable buffering for input FILE to prevent the buffering from flushing. */
setvbuf(in, NULL, _IOLBF, 0);
}
else
tty_changed = 0;
/* Write the prompt. */
fputs(prompt, out);
fflush(out);
/* Read the password. */
fgets (buf, PWD_BUFFER_SIZE-1, in);
if (buf != NULL)
{
nread = strlen(buf);
if (nread < 0)
buf[0] = '\0';
else if (buf[nread - 1] == '\n')
{
/* Remove the newline. */
buf[nread - 1] = '\0';
if (tty_changed)
/* Write the newline that was not echoed. */
putc('\n', out);
}
}
/* Restore the original setting. */
if (tty_changed) {
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
/* Re-enable buffering. */
setlinebuf(in);
}
if (in != stdin)
/* We opened the terminal; now close it. */
fclose (in);
return buf;
}
|
