From c050baa4488fdd83b4af50ee750d2b62c6d1eb87 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Thu, 28 Apr 1994 18:39:35 +0000
Subject: [PATCH] GNU shell utilities

---
 lib/pathmax.h | 53 +++++++++++++++++++++++++++++++++++++
 lib/xgetcwd.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 138 insertions(+)
 create mode 100644 lib/pathmax.h
 create mode 100644 lib/xgetcwd.c

diff --git a/lib/pathmax.h b/lib/pathmax.h
new file mode 100644
index 000000000..cfa14dd59
--- /dev/null
+++ b/lib/pathmax.h
@@ -0,0 +1,53 @@
+/* Define PATH_MAX somehow.  Requires sys/types.h.
+   Copyright (C) 1992 Free Software Foundation, Inc.
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _PATHMAX_H
+#define _PATHMAX_H
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
+   PATH_MAX but might cause redefinition warnings when sys/param.h is
+   later included (as on MORE/BSD 4.3).  */
+#if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
+#include <limits.h>
+#endif
+
+#ifndef _POSIX_PATH_MAX
+#define _POSIX_PATH_MAX 255
+#endif
+
+#if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
+#define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
+#endif
+
+/* Don't include sys/param.h if it already has been.  */
+#if !defined(PATH_MAX) && !defined(MAXPATHLEN) && !defined(__MSDOS__)
+#include <sys/param.h>
+#endif
+
+#if !defined(PATH_MAX) && defined(MAXPATHLEN)
+#define PATH_MAX MAXPATHLEN
+#endif
+
+#ifndef PATH_MAX
+#define PATH_MAX _POSIX_PATH_MAX
+#endif
+
+#endif /* _PATHMAX_H */
diff --git a/lib/xgetcwd.c b/lib/xgetcwd.c
new file mode 100644
index 000000000..6e775e74b
--- /dev/null
+++ b/lib/xgetcwd.c
@@ -0,0 +1,85 @@
+/* xgetcwd.c -- return current directory with unlimited length
+   Copyright (C) 1992 Free Software Foundation, Inc.
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Written by David MacKenzie, djm@gnu.ai.mit.edu. */
+
+#ifdef HAVE_CONFIG_H
+#if defined (CONFIG_BROKETS)
+/* We use <config.h> instead of "config.h" so that a compilation
+   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
+   (which it would do because it found this file in $srcdir).  */
+#include <config.h>
+#else
+#include "config.h"
+#endif
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+#include <sys/types.h>
+#include "pathmax.h"
+
+#if !defined(_POSIX_VERSION) && !defined(HAVE_GETCWD)
+char *getwd ();
+#define getcwd(buf, max) getwd (buf)
+#else
+char *getcwd ();
+#endif
+
+/* Amount to increase buffer size by in each try. */
+#define PATH_INCR 32
+
+char *xmalloc ();
+char *xrealloc ();
+void free ();
+
+/* Return the current directory, newly allocated, arbitrarily long.
+   Return NULL and set errno on error. */
+
+char *
+xgetcwd ()
+{
+  char *cwd;
+  char *ret;
+  unsigned path_max;
+
+  errno = 0;
+  path_max = (unsigned) PATH_MAX;
+  path_max += 2;		/* The getcwd docs say to do this. */
+
+  cwd = xmalloc (path_max);
+
+  errno = 0;
+  while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE)
+    {
+      path_max += PATH_INCR;
+      cwd = xrealloc (cwd, path_max);
+      errno = 0;
+    }
+
+  if (ret == NULL)
+    {
+      int save_errno = errno;
+      free (cwd);
+      errno = save_errno;
+      return NULL;
+    }
+  return cwd;
+}
-- 
2.11.0