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b2518f55 | 1 | /* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
28f540f4 RM |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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 | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #include <stdio.h> | |
20 | #include <termios.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | /* It is desireable to use this bit on systems that have it. | |
24 | The only bit of terminal state we want to twiddle is echoing, which is | |
25 | done in software; there is no need to change the state of the terminal | |
26 | hardware. */ | |
27 | ||
28 | #ifndef TCSASOFT | |
29 | #define TCSASOFT 0 | |
30 | #endif | |
31 | ||
32 | char * | |
33 | getpass (prompt) | |
34 | const char *prompt; | |
35 | { | |
36 | FILE *in, *out; | |
37 | struct termios t; | |
38 | int echo_off; | |
39 | static char *buf = NULL; | |
40 | static size_t bufsize = 0; | |
41 | ssize_t nread; | |
42 | ||
43 | /* Try to write to and read from the terminal if we can. | |
44 | If we can't open the terminal, use stderr and stdin. */ | |
45 | ||
46 | in = fopen ("/dev/tty", "w+"); | |
47 | if (in == NULL) | |
48 | { | |
49 | in = stdin; | |
50 | out = stderr; | |
51 | } | |
52 | else | |
53 | out = in; | |
54 | ||
55 | /* Turn echoing off if it is on now. */ | |
56 | ||
57 | if (tcgetattr (fileno (in), &t) == 0) | |
58 | { | |
59 | if (t.c_lflag & ECHO) | |
60 | { | |
61 | t.c_lflag &= ~ECHO; | |
62 | echo_off = tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0; | |
63 | t.c_lflag |= ECHO; | |
64 | } | |
65 | else | |
66 | echo_off = 0; | |
67 | } | |
68 | else | |
69 | echo_off = 0; | |
70 | ||
71 | /* Write the prompt. */ | |
72 | fputs (prompt, out); | |
73 | fflush (out); | |
74 | ||
75 | /* Read the password. */ | |
76 | nread = __getline (&buf, &bufsize, in); | |
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77 | if (buf != NULL) |
78 | if (nread < 0) | |
79 | buf[0] = '\0'; | |
80 | else if (buf[nread - 1] == '\n') | |
81 | { | |
82 | /* Remove the newline. */ | |
83 | buf[nread - 1] = '\0'; | |
84 | if (echo_off) | |
85 | /* Write the newline that was not echoed. */ | |
86 | putc ('\n', out); | |
87 | } | |
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88 | |
89 | /* Restore echoing. */ | |
90 | if (echo_off) | |
91 | (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t); | |
92 | ||
93 | if (in != stdin) | |
94 | /* We opened the terminal; now close it. */ | |
95 | fclose (in); | |
96 | ||
97 | return buf; | |
98 | } |