1 /* Copyright (C) 1992-2001, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #include "unlocked-io.h"
29 /* It is desirable to use this bit on systems that have it.
30 The only bit of terminal state we want to twiddle is echoing, which is
31 done in software; there is no need to change the state of the terminal
39 getpass (const char *prompt)
45 static size_t bufsize;
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. */
51 in = fopen ("/dev/tty", "w+");
60 /* Turn echoing off if it is on now. */
62 if (tcgetattr (fileno (in), &t) == 0)
64 /* Save the old one. */
67 t.c_lflag &= ~(ECHO|ISIG);
68 tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
73 /* Write the prompt. */
77 /* Read the password. */
78 nread = getline (&buf, &bufsize, in);
83 else if (buf[nread - 1] == '\n')
85 /* Remove the newline. */
86 buf[nread - 1] = '\0';
89 /* Write the newline that was not echoed.
90 But before doing that, do a no-op fseek. According to the C
91 standard, input may not be followed by output on the same
92 stream without an intervening call to a file positioning
93 function. Without this fseek() call, on Solaris, HP-UX,
94 AIX, OSF/1, the previous input gets echoed, whereas on IRIX,
95 the following newline is not output as it should. */
97 fseek (out, 0, SEEK_CUR);
103 /* Restore the original setting. */
105 (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
108 /* We opened the terminal; now close it. */