diff options
Diffstat (limited to 'misc/getpass.c')
-rw-r--r-- | misc/getpass.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/misc/getpass.c b/misc/getpass.c new file mode 100644 index 0000000..ec535c1 --- /dev/null +++ b/misc/getpass.c @@ -0,0 +1,92 @@ +/* Copyright (C) 1992, 1993, 1994 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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <stdio.h> +#include <termios.h> +#include <unistd.h> + +/* It is desireable 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 + +char * +getpass (prompt) + const char *prompt; +{ + FILE *in, *out; + struct termios t; + int echo_off; + static char *buf = NULL; + static size_t bufsize = 0; + ssize_t 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", "w+"); + if (in == NULL) + { + in = stdin; + out = stderr; + } + else + out = in; + + /* Turn echoing off if it is on now. */ + + if (tcgetattr (fileno (in), &t) == 0) + { + if (t.c_lflag & ECHO) + { + t.c_lflag &= ~ECHO; + echo_off = tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0; + t.c_lflag |= ECHO; + } + else + echo_off = 0; + } + else + echo_off = 0; + + /* Write the prompt. */ + fputs (prompt, out); + fflush (out); + + /* Read the password. */ + nread = __getline (&buf, &bufsize, in); + if (nread < 0 && buf != NULL) + buf[0] = '\0'; + else if (buf[nread - 1] == '\n') + /* Remove the newline. */ + buf[nread - 1] = '\0'; + + /* Restore echoing. */ + if (echo_off) + (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t); + + if (in != stdin) + /* We opened the terminal; now close it. */ + fclose (in); + + return buf; +} |