1 /* Copyright (C) 1992-2001, 2003-2007, 2009-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, see <https://www.gnu.org/licenses/>. */
19 /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
20 warns for the null checks on 'prompt' below. */
21 # define _GL_ARG_NONNULL(params)
29 #if !(defined _WIN32 && !defined __CYGWIN__)
33 # if HAVE_DECL___FSETLOCKING && HAVE___FSETLOCKING
35 # include <stdio_ext.h>
38 # define __fsetlocking(stream, type) /* empty */
46 # include "unlocked-io.h"
48 # if !HAVE_DECL_FFLUSH_UNLOCKED
49 # undef fflush_unlocked
50 # define fflush_unlocked(x) fflush (x)
52 # if !HAVE_DECL_FLOCKFILE
54 # define flockfile(x) ((void) 0)
56 # if !HAVE_DECL_FUNLOCKFILE
58 # define funlockfile(x) ((void) 0)
60 # if !HAVE_DECL_FPUTS_UNLOCKED
61 # undef fputs_unlocked
62 # define fputs_unlocked(str,stream) fputs (str, stream)
64 # if !HAVE_DECL_PUTC_UNLOCKED
66 # define putc_unlocked(c,stream) putc (c, stream)
70 /* It is desirable to use this bit on systems that have it.
71 The only bit of terminal state we want to twiddle is echoing, which is
72 done in software; there is no need to change the state of the terminal
80 call_fclose (void *arg
)
87 getpass (const char *prompt
)
94 bool tty_changed
= false;
96 static size_t bufsize
;
99 /* Try to write to and read from the terminal if we can.
100 If we can't open the terminal, use stderr and stdin. */
102 tty
= fopen ("/dev/tty", "w+e");
110 /* We do the locking ourselves. */
111 __fsetlocking (tty
, FSETLOCKING_BYCALLER
);
118 /* Turn echoing off if it is on now. */
120 if (tcgetattr (fileno (in
), &t
) == 0)
122 /* Save the old one. */
124 /* Tricky, tricky. */
125 t
.c_lflag
&= ~(ECHO
| ISIG
);
126 tty_changed
= (tcsetattr (fileno (in
), TCSAFLUSH
| TCSASOFT
, &t
) == 0);
132 /* Write the prompt. */
133 fputs_unlocked (prompt
, out
);
134 fflush_unlocked (out
);
137 /* Read the password. */
138 nread
= getline (&buf
, &bufsize
, in
);
140 /* According to the C standard, input may not be followed by output
141 on the same stream without an intervening call to a file
142 positioning function. Suppose in == out; then without this fseek
143 call, on Solaris, HP-UX, AIX, OSF/1, the previous input gets
144 echoed, whereas on IRIX, the following newline is not output as
145 it should be. POSIX imposes similar restrictions if fileno (in)
146 == fileno (out). The POSIX restrictions are tricky and change
147 from POSIX version to POSIX version, so play it safe and invoke
148 fseek even if in != out. */
149 fseeko (out
, 0, SEEK_CUR
);
155 else if (buf
[nread
- 1] == '\n')
157 /* Remove the newline. */
158 buf
[nread
- 1] = '\0';
161 /* Write the newline that was not echoed. */
162 putc_unlocked ('\n', out
);
167 /* Restore the original setting. */
170 tcsetattr (fileno (in
), TCSAFLUSH
| TCSASOFT
, &s
);
180 #else /* W32 native */
182 /* Windows implementation by Martin Lambers <marlam@marlam.de>,
183 improved by Simon Josefsson. */
193 # define PASS_MAX 512
197 getpass (const char *prompt
)
199 char getpassbuf
[PASS_MAX
+ 1];
205 fputs (prompt
, stderr
);
214 getpassbuf
[i
] = '\0';
217 else if (i
< PASS_MAX
)
224 getpassbuf
[i
] = '\0';
231 fputs ("\r\n", stderr
);
235 return strdup (getpassbuf
);