Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 81 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/getlogin.c b/REORG.TODO/sysdeps/unix/getlogin.c
new file mode 100644
index 0000000000..7d4ff53ba4
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/getlogin.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 1991-2017 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <limits.h>
+#include <fcntl.h>
+
+#include <utmp.h>
+
+static char name[UT_NAMESIZE + 1];
+
+/* Return the login name of the user, or NULL if it can't be determined.
+   The returned pointer, if not NULL, is good only until the next call.  */
+
+#ifdef STATIC
+STATIC
+#endif
+char *
+getlogin (void)
+{
+  char tty_pathname[2 + 2 * NAME_MAX];
+  char *real_tty_path = tty_pathname;
+  int err;
+  char *result = NULL;
+  struct utmp *ut, line, buffer;
+
+  /* Get name of tty connected to fd 0.  Return NULL if not a tty or
+     if fd 0 isn't open.  Note that a lot of documentation says that
+     getlogin() is based on the controlling terminal---what they
+     really mean is "the terminal connected to standard input".  The
+     getlogin() implementation of DEC Unix, SunOS, Solaris, HP-UX all
+     return NULL if fd 0 has been closed, so this is the compatible
+     thing to do.  Note that ttyname(open("/dev/tty")) on those
+     systems returns /dev/tty, so that is not a possible solution for
+     getlogin().  */
+  err = __ttyname_r (0, real_tty_path, sizeof (tty_pathname));
+  if (err != 0)
+    {
+      __set_errno (err);
+      return NULL;
+    }
+
+  real_tty_path += 5;		/* Remove "/dev/".  */
+
+  __setutent ();
+  strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);
+  if (__getutline_r (&line, &buffer, &ut) < 0)
+    {
+      if (errno == ESRCH)
+	/* The caller expects ENOENT if nothing is found.  */
+	__set_errno (ENOENT);
+      result = NULL;
+    }
+  else
+    {
+      strncpy (name, ut->ut_user, UT_NAMESIZE);
+      name[UT_NAMESIZE] = '\0';
+      result = name;
+    }
+
+  __endutent ();
+
+  return result;
+}