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authorWojciech Polak <polak@gnu.org>2004-02-14 11:12:08 (GMT)
committer Wojciech Polak <polak@gnu.org>2004-02-14 11:12:08 (GMT)
commit5b0521a20bb8c0ab5a6133305a55afd7a0f6cb16 (patch) (side-by-side diff)
tree9185421ec4ad5594c35e2661a81e9085eb4b22fc /lib
parent2af5d57c63c1c80cbf4487b032fefb4b94e9ee2a (diff)
downloadanubis-5b0521a20bb8c0ab5a6133305a55afd7a0f6cb16.tar.gz
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New file
Diffstat (limited to 'lib') (more/less context) (ignore whitespace changes)
-rw-r--r--lib/getpass.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/lib/getpass.c b/lib/getpass.c
new file mode 100644
index 0000000..8a993d3
--- a/dev/null
+++ b/lib/getpass.c
@@ -0,0 +1,192 @@
+/* Copyright (C) 1992-2001, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if _LIBC
+# define HAVE_STDIO_EXT_H 1
+#endif
+
+#include <stdbool.h>
+
+#include <stdio.h>
+#if HAVE_STDIO_EXT_H
+# include <stdio_ext.h>
+#else
+# define __fsetlocking(stream, type) /* empty */
+#endif
+#if !_LIBC
+# include "getline.h"
+#endif
+
+#include <termios.h>
+#include <unistd.h>
+
+#if _LIBC
+# include <wchar.h>
+#endif
+
+#if _LIBC
+# define NOTCANCEL_MODE "c"
+#else
+# define NOTCANCEL_MODE
+#endif
+
+#if _LIBC
+# define flockfile(s) _IO_flockfile (s)
+# define funlockfile(s) _IO_funlockfile (s)
+#else
+# include "unlocked-io.h"
+#endif
+
+#if _LIBC
+# include <bits/libc-lock.h>
+#else
+# define __libc_cleanup_push(function, arg) /* empty */
+# define __libc_cleanup_pop(execute) /* empty */
+#endif
+
+#if !_LIBC
+# define __getline getline
+# define __tcgetattr tcgetattr
+#endif
+
+/* It is desirable 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
+
+static void
+call_fclose (void *arg)
+{
+ if (arg != NULL)
+ fclose (arg);
+}
+
+char *
+getpass (const char *prompt)
+{
+ FILE *tty;
+ FILE *in, *out;
+ struct termios s, t;
+ bool tty_changed;
+ static char *buf;
+ static size_t bufsize;
+ 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. */
+
+ tty = fopen ("/dev/tty", "w+" NOTCANCEL_MODE);
+ if (tty == NULL)
+ {
+ in = stdin;
+ out = stderr;
+ }
+ else
+ {
+ /* We do the locking ourselves. */
+ __fsetlocking (tty, FSETLOCKING_BYCALLER);
+
+ out = in = tty;
+ }
+
+ /* Make sure the stream we opened is closed even if the thread is
+ canceled. */
+ __libc_cleanup_push (call_fclose, tty);
+
+ flockfile (out);
+
+ /* Turn echoing off if it is on now. */
+
+ if (__tcgetattr (fileno (in), &t) == 0)
+ {
+ /* Save the old one. */
+ s = t;
+ /* Tricky, tricky. */
+ t.c_lflag &= ~(ECHO|ISIG);
+ tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
+ }
+ else
+ tty_changed = false;
+
+ /* Write the prompt. */
+#ifdef USE_IN_LIBIO
+ if (_IO_fwide (out, 0) > 0)
+ __fwprintf (out, L"%s", prompt);
+ else
+#endif
+ fputs_unlocked (prompt, out);
+ fflush_unlocked (out);
+
+ /* Read the password. */
+ nread = __getline (&buf, &bufsize, in);
+
+#if !_LIBC
+ /* As far as is known, glibc doesn't need this no-op fseek. */
+
+ /* According to the C standard, input may not be followed by output
+ on the same stream without an intervening call to a file
+ positioning function. Suppose in == out; then without this fseek
+ call, on Solaris, HP-UX, AIX, OSF/1, the previous input gets
+ echoed, whereas on IRIX, the following newline is not output as
+ it should be. POSIX imposes similar restrictions if fileno (in)
+ == fileno (out). The POSIX restrictions are tricky and change
+ from POSIX version to POSIX version, so play it safe and invoke
+ fseek even if in != out. */
+ fseek (out, 0, SEEK_CUR);
+#endif
+
+ if (buf != NULL)
+ {
+ if (nread < 0)
+ buf[0] = '\0';
+ else if (buf[nread - 1] == '\n')
+ {
+ /* Remove the newline. */
+ buf[nread - 1] = '\0';
+ if (tty_changed)
+ {
+ /* Write the newline that was not echoed. */
+#ifdef USE_IN_LIBIO
+ if (_IO_fwide (out, 0) > 0)
+ putwc_unlocked (L'\n', out);
+ else
+#endif
+ putc_unlocked ('\n', out);
+ }
+ }
+ }
+
+ /* Restore the original setting. */
+ if (tty_changed)
+ (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
+
+ funlockfile (out);
+
+ __libc_cleanup_pop (0);
+
+ call_fclose (tty);
+
+ return buf;
+}

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