Initial revision

diff --git a/m4/getcwd.m4 b/m4/getcwd.m4
new file mode 100644 (file)
index 0000000..ce4007e
--- /dev/null
+++ b/m4/getcwd.m4
@@ -0,0 +1,53 @@
+# getcwd.m4 - check whether getcwd (NULL, 0) allocates memory for result
+
+# Copyright 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 Paul Eggert.
+
+AC_DEFUN([AC_FUNC_GETCWD_NULL],
+  [AC_CHECK_HEADERS(stdlib.h unistd.h)
+   AC_CACHE_CHECK([[whether getcwd (NULL, 0) allocates memory for result]],
+     [ac_cv_func_getcwd_null],
+     [AC_TRY_RUN(
+        [
+#       ifdef HAVE_STDLIB_H
+#        include <stdlib.h>
+#       endif
+#       ifdef HAVE_UNISTD_H
+#        include <unistd.h>
+#       endif
+#       ifndef getcwd
+        char *getcwd ();
+#       endif
+        int
+        main ()
+        {
+          if (chdir ("/") != 0)
+            exit (1);
+          else
+            {
+              char *f = getcwd (NULL, 0);
+              exit (! (f && f[0] == '/' && !f[1]));
+            }
+        }],
+       [ac_cv_func_getcwd_null=yes],
+       [ac_cv_func_getcwd_null=no],
+       [ac_cv_func_getcwd_null=no])])
+   if test $ac_cv_func_getcwd_null = yes; then
+     AC_DEFINE(HAVE_GETCWD_NULL, 1,
+              [[Define if getcwd (NULL, 0) allocates memory for result.]])
+   fi])