initial import

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;
+}