Initial revision

lib/xgetcwd.c

@@ -0,0 +1,89 @@
+/* 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
+}