--- /dev/null
+/* xgetcwd.c -- return current directory with unlimited length
+ Copyright (C) 1992, 1996, 2000, 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include <sys/types.h>
+#include "pathmax.h"
+
+#if HAVE_GETCWD
+char *getcwd ();
+#else
+char *getwd ();
+# define getcwd(Buf, Max) getwd (Buf)
+#endif
+
+extern void *xmalloc ();
+extern char *xstrdup ();
+extern void free ();
+
+/* Return the current directory, newly allocated, arbitrarily long.
+ Return NULL and set errno on error. */
+
+char *
+xgetcwd ()
+{
+#if defined __GLIBC__ && __GLIBC__ >= 2
+ return getcwd (NULL, 0);
+#else
+ char *ret;
+ unsigned path_max;
+ char buf[1024];
+
+ errno = 0;
+ ret = getcwd (buf, sizeof (buf));
+ if (ret != NULL)
+ return xstrdup (buf);
+ if (errno != ERANGE)
+ return NULL;
+
+ path_max = 1300;
+ path_max += 2; /* The getcwd docs say to do this. */
+
+ for (;;)
+ {
+ char *cwd = (char *) xmalloc (path_max);
+
+ errno = 0;
+ ret = getcwd (cwd, path_max);
+ if (ret != NULL)
+ return ret;
+ if (errno != ERANGE)
+ {
+ int save_errno = errno;
+ free (cwd);
+ errno = save_errno;
+ return NULL;
+ }
+
+ free (cwd);
+
+ path_max += path_max / 16;
+ path_max += 32;
+ }
+#endif
+}