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      1 # dirent_h.m4 serial 19
      2 dnl Copyright (C) 2008-2022 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 dnl Written by Bruno Haible.
      8 
      9 AC_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.
     34 AC_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.
     46 AC_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 
     63 AC_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