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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /misc/getpass.c
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initial import
Diffstat (limited to 'misc/getpass.c')
-rw-r--r--misc/getpass.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/misc/getpass.c b/misc/getpass.c
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index 0000000..ec535c1
--- /dev/null
+++ b/misc/getpass.c
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+/* 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;
+}