1# getcwd.m4 - check for working getcwd that is compatible with glibc
2
3# Copyright (C) 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
4# This file is free software; the Free Software Foundation
5# gives unlimited permission to copy and/or distribute it,
6# with or without modifications, as long as this notice is preserved.
7
8# Written by Paul Eggert.
9
10AC_DEFUN([gl_FUNC_GETCWD_NULL],
11  [
12   AC_LIBSOURCES([getcwd.c, getcwd.h])
13
14   AC_CHECK_HEADERS_ONCE(unistd.h)
15   AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
16     [gl_cv_func_getcwd_null],
17     [AC_TRY_RUN(
18        [
19#          include <stdlib.h>
20#          ifdef HAVE_UNISTD_H
21#           include <unistd.h>
22#          endif
23#          ifndef getcwd
24           char *getcwd ();
25#          endif
26           int
27           main ()
28           {
29             if (chdir ("/") != 0)
30               exit (1);
31             else
32               {
33                 char *f = getcwd (NULL, 0);
34                 exit (! (f && f[0] == '/' && !f[1]));
35               }
36           }],
37          [gl_cv_func_getcwd_null=yes],
38          [gl_cv_func_getcwd_null=no],
39          [gl_cv_func_getcwd_null=no])])
40])
41
42AC_DEFUN([gl_FUNC_GETCWD],
43[
44  AC_REQUIRE([gl_FUNC_GETCWD_NULL])
45
46  case $gl_cv_func_getcwd_null in
47  yes) gl_FUNC_GETCWD_PATH_MAX;;
48  esac
49
50  case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max in
51  yes,yes) ;;
52  *)
53    AC_LIBOBJ([getcwd])
54    AC_DEFINE([__GETCWD_PREFIX], [[rpl_]],
55      [Define to rpl_ if the getcwd replacement function should be used.])
56    gl_PREREQ_GETCWD;;
57  esac
58])
59
60# Prerequisites of lib/getcwd.c.
61AC_DEFUN([gl_PREREQ_GETCWD],
62[
63  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
64  AC_REQUIRE([AC_HEADER_DIRENT])
65  AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
66  :
67])
68