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50304ef0 | 1 | /* Copyright (C) 1992, 93, 94, 95, 96, 97, 98 Free Software Foundation, Inc. |
6d52618b | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
6d52618b UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
6d52618b UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
6d52618b UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 RM |
18 | |
19 | #include <stdio.h> | |
20 | #include <termios.h> | |
21 | #include <unistd.h> | |
22 | ||
50304ef0 UD |
23 | #ifdef USE_IN_LIBIO |
24 | # define flockfile(s) _IO_flockfile (s) | |
25 | # define funlockfile(s) _IO_funlockfile (s) | |
26 | #endif | |
27 | ||
6d52618b | 28 | /* It is desirable to use this bit on systems that have it. |
28f540f4 RM |
29 | The only bit of terminal state we want to twiddle is echoing, which is |
30 | done in software; there is no need to change the state of the terminal | |
31 | hardware. */ | |
32 | ||
33 | #ifndef TCSASOFT | |
34 | #define TCSASOFT 0 | |
35 | #endif | |
36 | ||
37 | char * | |
38 | getpass (prompt) | |
39 | const char *prompt; | |
40 | { | |
41 | FILE *in, *out; | |
df4ef2ab UD |
42 | struct termios s, t; |
43 | int tty_changed; | |
28f540f4 RM |
44 | static char *buf = NULL; |
45 | static size_t bufsize = 0; | |
46 | ssize_t nread; | |
47 | ||
48 | /* Try to write to and read from the terminal if we can. | |
49 | If we can't open the terminal, use stderr and stdin. */ | |
50 | ||
51 | in = fopen ("/dev/tty", "w+"); | |
52 | if (in == NULL) | |
53 | { | |
54 | in = stdin; | |
55 | out = stderr; | |
56 | } | |
57 | else | |
58 | out = in; | |
59 | ||
50304ef0 UD |
60 | flockfile (out); |
61 | ||
28f540f4 RM |
62 | /* Turn echoing off if it is on now. */ |
63 | ||
50304ef0 | 64 | if (__tcgetattr (fileno (in), &t) == 0) |
28f540f4 | 65 | { |
df4ef2ab UD |
66 | /* Save the old one. */ |
67 | s = t; | |
68 | /* Tricky, tricky. */ | |
ceb2d9aa | 69 | t.c_lflag &= ~(ECHO|ISIG); |
df4ef2ab | 70 | tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0); |
28f540f4 RM |
71 | } |
72 | else | |
df4ef2ab | 73 | tty_changed = 0; |
28f540f4 RM |
74 | |
75 | /* Write the prompt. */ | |
50304ef0 UD |
76 | fputs_unlocked (prompt, out); |
77 | fflush_unlocked (out); | |
28f540f4 RM |
78 | |
79 | /* Read the password. */ | |
80 | nread = __getline (&buf, &bufsize, in); | |
5ca8c0ba MB |
81 | if (buf != NULL) |
82 | if (nread < 0) | |
83 | buf[0] = '\0'; | |
84 | else if (buf[nread - 1] == '\n') | |
85 | { | |
86 | /* Remove the newline. */ | |
87 | buf[nread - 1] = '\0'; | |
df4ef2ab | 88 | if (tty_changed) |
5ca8c0ba | 89 | /* Write the newline that was not echoed. */ |
50304ef0 | 90 | putc_unlocked ('\n', out); |
5ca8c0ba | 91 | } |
28f540f4 | 92 | |
df4ef2ab UD |
93 | /* Restore the original setting. */ |
94 | if (tty_changed) | |
95 | (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s); | |
28f540f4 | 96 | |
50304ef0 UD |
97 | funlockfile (out); |
98 | ||
28f540f4 RM |
99 | if (in != stdin) |
100 | /* We opened the terminal; now close it. */ | |
101 | fclose (in); | |
102 | ||
103 | return buf; | |
104 | } |