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@@ -0,0 +1,53 @@
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+# getcwd.m4 - check whether getcwd (NULL, 0) allocates memory for result
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+
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+# Copyright 2001 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2, or (at your option)
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+# any later version.
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+
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+
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+# You should have received a copy of the GNU General Public License
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+# along with this program; if not, write to the Free Software Foundation,
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+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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+
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+# Written by Paul Eggert.
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+
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+AC_DEFUN([AC_FUNC_GETCWD_NULL],
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+ [AC_CHECK_HEADERS(stdlib.h unistd.h)
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+ AC_CACHE_CHECK([[whether getcwd (NULL, 0) allocates memory for result]],
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+ [ac_cv_func_getcwd_null],
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+ [AC_TRY_RUN(
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+ [
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+# ifdef HAVE_STDLIB_H
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+# include <stdlib.h>
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+# endif
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+# ifdef HAVE_UNISTD_H
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+# include <unistd.h>
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+# endif
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+# ifndef getcwd
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+ char *getcwd ();
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+# endif
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+ int
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+ main ()
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+ {
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+ if (chdir ("/") != 0)
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+ exit (1);
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+ else
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+ {
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+ char *f = getcwd (NULL, 0);
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+ exit (! (f && f[0] == '/' && !f[1]));
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+ }
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+ }],
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+ [ac_cv_func_getcwd_null=yes],
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+ [ac_cv_func_getcwd_null=no],
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+ [ac_cv_func_getcwd_null=no])])
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+ if test $ac_cv_func_getcwd_null = yes; then
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+ AC_DEFINE(HAVE_GETCWD_NULL, 1,
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+ [[Define if getcwd (NULL, 0) allocates memory for result.]])
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+ fi])
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Paul Eggert