1# dirent_h.m4 serial 19
2dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl Written by Bruno Haible.
8
9AC_DEFUN_ONCE([gl_DIRENT_H],
10[
11  dnl Ensure to expand the default settings once only, before all statements
12  dnl that occur in other macros.
13  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
14
15  dnl <dirent.h> is always overridden, because of GNULIB_POSIXCHECK.
16  gl_CHECK_NEXT_HEADERS([dirent.h])
17  if test $ac_cv_header_dirent_h = yes; then
18    HAVE_DIRENT_H=1
19  else
20    HAVE_DIRENT_H=0
21  fi
22  AC_SUBST([HAVE_DIRENT_H])
23
24  dnl Check for declarations of anything we want to poison if the
25  dnl corresponding gnulib module is not in use.
26  gl_WARN_ON_USE_PREPARE([[#include <dirent.h>
27    ]], [alphasort closedir dirfd fdopendir opendir readdir rewinddir scandir])
28])
29
30# gl_DIRENT_MODULE_INDICATOR([modulename])
31# sets the shell variable that indicates the presence of the given module
32# to a C preprocessor expression that will evaluate to 1.
33# This macro invocation must not occur in macros that are AC_REQUIREd.
34AC_DEFUN([gl_DIRENT_MODULE_INDICATOR],
35[
36  dnl Ensure to expand the default settings once only.
37  gl_DIRENT_H_REQUIRE_DEFAULTS
38  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
39  dnl Define it also as a C macro, for the benefit of the unit tests.
40  gl_MODULE_INDICATOR_FOR_TESTS([$1])
41])
42
43# Initializes the default values for AC_SUBSTed shell variables.
44# This macro must not be AC_REQUIREd.  It must only be invoked, and only
45# outside of macros or in macros that are not AC_REQUIREd.
46AC_DEFUN([gl_DIRENT_H_REQUIRE_DEFAULTS],
47[
48  m4_defun(GL_MODULE_INDICATOR_PREFIX[_DIRENT_H_MODULE_INDICATOR_DEFAULTS], [
49    gl_UNISTD_H_REQUIRE_DEFAULTS dnl for REPLACE_FCHDIR
50    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPENDIR])
51    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_READDIR])
52    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REWINDDIR])
53    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CLOSEDIR])
54    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DIRFD])
55    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FDOPENDIR])
56    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCANDIR])
57    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ALPHASORT])
58  ])
59  m4_require(GL_MODULE_INDICATOR_PREFIX[_DIRENT_H_MODULE_INDICATOR_DEFAULTS])
60  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
61])
62
63AC_DEFUN([gl_DIRENT_H_DEFAULTS],
64[
65  dnl Assume proper GNU behavior unless another module says otherwise.
66  HAVE_OPENDIR=1;       AC_SUBST([HAVE_OPENDIR])
67  HAVE_READDIR=1;       AC_SUBST([HAVE_READDIR])
68  HAVE_REWINDDIR=1;     AC_SUBST([HAVE_REWINDDIR])
69  HAVE_CLOSEDIR=1;      AC_SUBST([HAVE_CLOSEDIR])
70  HAVE_DECL_DIRFD=1;    AC_SUBST([HAVE_DECL_DIRFD])
71  HAVE_DECL_FDOPENDIR=1;AC_SUBST([HAVE_DECL_FDOPENDIR])
72  HAVE_FDOPENDIR=1;     AC_SUBST([HAVE_FDOPENDIR])
73  HAVE_SCANDIR=1;       AC_SUBST([HAVE_SCANDIR])
74  HAVE_ALPHASORT=1;     AC_SUBST([HAVE_ALPHASORT])
75  REPLACE_OPENDIR=0;    AC_SUBST([REPLACE_OPENDIR])
76  REPLACE_CLOSEDIR=0;   AC_SUBST([REPLACE_CLOSEDIR])
77  REPLACE_DIRFD=0;      AC_SUBST([REPLACE_DIRFD])
78  REPLACE_FDOPENDIR=0;  AC_SUBST([REPLACE_FDOPENDIR])
79])
80