# This file is part of Autoconf.                       -*- Autoconf -*-
# Checking for headers.
#
# Copyright (C) 2000, 2001, 2002, 2003 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.
#
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf.  You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them.  The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
#
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf.  We call these the "data" portions.  The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case.  We call these
# comments and executable code the "non-data" portions.  Autoconf never
# copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation.  When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with.  (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.)  If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
#
# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.


# Table of contents
#
# 1. Generic tests for headers
# 2. Default includes
# 3. Headers to tests with AC_CHECK_HEADERS
# 4. Tests for specific headers


## ------------------------------ ##
## 1. Generic tests for headers.  ##
## ------------------------------ ##


# AC_CHECK_HEADER(HEADER-FILE,
#                 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                 [INCLUDES])
# ---------------------------------------------------------
# We are slowly moving to checking headers with the compiler instead
# of the preproc, so that we actually learn about the usability of a
# header instead of its mere presence.  But since users are used to
# the old semantics, they check for headers in random order and
# without providing prerequisite headers.  This macro implements the
# transition phase, and should be cleaned up latter to use compilation
# only.
#
# If INCLUDES is empty, then check both via the compiler and preproc.
# If the results are different, issue a warning, but keep the preproc
# result.
#
# If INCLUDES is `-', keep only the old semantics.
#
# If INCLUDES is specified and different from `-', then use the new
# semantics only.
AC_DEFUN([AC_CHECK_HEADER],
[m4_case([$4],
	 [],  [_AC_CHECK_HEADER_MONGREL($@)],
	 [-], [_AC_CHECK_HEADER_OLD($@)],
	      [_AC_CHECK_HEADER_NEW($@)])
])# AC_CHECK_HEADER


# _AC_CHECK_HEADER_MONGREL(HEADER-FILE,
#                          [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                          [INCLUDES])
# --------------------------------------------------------------
# Check using both the compiler and the preprocessor.  If they disagree,
# warn, and the preproc wins.
#
# This is not based on _AC_CHECK_HEADER_NEW and _AC_CHECK_HEADER_OLD
# because it obfuscate the code to try to factor everything, in particular
# because of the cache variables, and the `checking...' messages.
m4_define([_AC_CHECK_HEADER_MONGREL],
[AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])dnl
AS_VAR_SET_IF(ac_Header,
	      [AC_CACHE_CHECK([for $1], ac_Header, [])],
	      [# Is the header compilable?
AC_MSG_CHECKING([$1 usability])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([AC_INCLUDES_DEFAULT([$4])
@%:@include <$1>])],
		  [ac_header_compiler=yes],
		  [ac_header_compiler=no])
AC_MSG_RESULT([$ac_header_compiler])

# Is the header present?
AC_MSG_CHECKING([$1 presence])
AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <$1>])],
		  [ac_header_preproc=yes],
		  [ac_header_preproc=no])
AC_MSG_RESULT([$ac_header_preproc])

# So?  What about this header?
case $ac_header_compiler:$ac_header_preproc:$ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag in
  yes:no: )
    AC_MSG_WARN([$1: accepted by the compiler, rejected by the preprocessor!])
    AC_MSG_WARN([$1: proceeding with the compiler's result])
    ac_header_preproc=yes
    ;;
  no:yes:* )
    AC_MSG_WARN([$1: present but cannot be compiled])
    AC_MSG_WARN([$1:     check for missing prerequisite headers?])
    AC_MSG_WARN([$1: see the Autoconf documentation])
    AC_MSG_WARN([$1:     section "Present But Cannot Be Compiled"])
    AC_MSG_WARN([$1: proceeding with the preprocessor's result])
    AC_MSG_WARN([$1: in the future, the compiler will take precedence])
    (
      AS_BOX([Report this to ]m4_ifset([AC_PACKAGE_BUGREPORT],
				       [AC_PACKAGE_BUGREPORT],
				       [the AC_PACKAGE_NAME lists. ]))
    ) |
      sed "s/^/$as_me: WARNING:     /" >&2
    ;;
esac
AC_CACHE_CHECK([for $1], ac_Header,
	       [AS_VAR_SET(ac_Header, $ac_header_preproc)])
])dnl ! set ac_HEADER
AS_IF([test AS_VAR_GET(ac_Header) = yes], [$2], [$3])[]dnl
AS_VAR_POPDEF([ac_Header])dnl
])# _AC_CHECK_HEADER_MONGREL


# _AC_CHECK_HEADER_NEW(HEADER-FILE,
#                      [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                      [INCLUDES])
# --------------------------------------------------------------
# Check the compiler accepts HEADER-FILE.  The INCLUDES are defaulted.
m4_define([_AC_CHECK_HEADER_NEW],
[AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])dnl
AC_CACHE_CHECK([for $1], ac_Header,
	       [AC_COMPILE_IFELSE([AC_LANG_SOURCE([AC_INCLUDES_DEFAULT([$4])
@%:@include <$1>])],
				  [AS_VAR_SET(ac_Header, yes)],
				  [AS_VAR_SET(ac_Header, no)])])
AS_IF([test AS_VAR_GET(ac_Header) = yes], [$2], [$3])[]dnl
AS_VAR_POPDEF([ac_Header])dnl
])# _AC_CHECK_HEADER_NEW


# _AC_CHECK_HEADER_OLD(HEADER-FILE,
#                      [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# --------------------------------------------------------------
# Check the preprocessor accepts HEADER-FILE.
m4_define([_AC_CHECK_HEADER_OLD],
[AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])dnl
AC_CACHE_CHECK([for $1], ac_Header,
	       [AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <$1>])],
					 [AS_VAR_SET(ac_Header, yes)],
					 [AS_VAR_SET(ac_Header, no)])])
AS_IF([test AS_VAR_GET(ac_Header) = yes], [$2], [$3])[]dnl
AS_VAR_POPDEF([ac_Header])dnl
])# _AC_CHECK_HEADER_OLD


# AH_CHECK_HEADERS(HEADER-FILE...)
# --------------------------------
m4_define([AH_CHECK_HEADERS],
[AC_FOREACH([AC_Header], [$1],
  [AH_TEMPLATE(AS_TR_CPP(HAVE_[]AC_Header),
	       [Define to 1 if you have the <]AC_Header[> header file.])])])


# AC_CHECK_HEADERS(HEADER-FILE...
#                  [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                  [INCLUDES])
# ----------------------------------------------------------
AC_DEFUN([AC_CHECK_HEADERS],
[AH_CHECK_HEADERS([$1])dnl
for ac_header in $1
do
AC_CHECK_HEADER($ac_header,
		[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$ac_header)) $2],
		[$3],
		[$4])dnl
done
])# AC_CHECK_HEADERS




## --------------------- ##
## 2. Default includes.  ##
## --------------------- ##

# Always use the same set of default headers for all the generic
# macros.  It is easier to document, to extend, and to understand than
# having specific defaults for each macro.

# _AC_INCLUDES_DEFAULT_REQUIREMENTS
# ---------------------------------
# Required when AC_INCLUDES_DEFAULT uses its default branch.
AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
[m4_divert_text([DEFAULTS],
[# Factoring default headers for most tests.
dnl If ever you change this variable, please keep autoconf.texi in sync.
ac_includes_default="\
#include <stdio.h>
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#if STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# if HAVE_STDLIB_H
#  include <stdlib.h>
# endif
#endif
#if HAVE_STRING_H
# if !STDC_HEADERS && HAVE_MEMORY_H
#  include <memory.h>
# endif
# include <string.h>
#endif
#if HAVE_STRINGS_H
# include <strings.h>
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#else
# if HAVE_STDINT_H
#  include <stdint.h>
# endif
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif"
])dnl
AC_REQUIRE([AC_HEADER_STDC])dnl
# On IRIX 5.3, sys/types and inttypes.h are conflicting.
AC_CHECK_HEADERS([sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
		  inttypes.h stdint.h unistd.h],
		 [], [], $ac_includes_default)
])# _AC_INCLUDES_DEFAULT_REQUIREMENTS


# AC_INCLUDES_DEFAULT([INCLUDES])
# -------------------------------
# If INCLUDES is empty, expand in default includes, otherwise in
# INCLUDES.
# In most cases INCLUDES is not double quoted as it should, and if
# for instance INCLUDES = `#include <stdio.h>' then unless we force
# a newline, the hash will swallow the closing paren etc. etc.
# The usual failure.
# Take no risk: for the newline.
AC_DEFUN([AC_INCLUDES_DEFAULT],
[m4_ifval([$1], [$1
],
	  [AC_REQUIRE([_AC_INCLUDES_DEFAULT_REQUIREMENTS])dnl
$ac_includes_default])])





## ------------------------------------------- ##
## 3. Headers to check with AC_CHECK_HEADERS.  ##
## ------------------------------------------- ##

# errno.h is portable.

AN_HEADER([OS.h],               [AC_CHECK_HEADERS])
AN_HEADER([argz.h],             [AC_CHECK_HEADERS])
AN_HEADER([arpa/inet.h],        [AC_CHECK_HEADERS])
AN_HEADER([fcntl.h],            [AC_CHECK_HEADERS])
AN_HEADER([fenv.h],             [AC_CHECK_HEADERS])
AN_HEADER([float.h],            [AC_CHECK_HEADERS])
AN_HEADER([fs_info.h],          [AC_CHECK_HEADERS])
AN_HEADER([inttypes.h],         [AC_CHECK_HEADERS])
AN_HEADER([langinfo.h],         [AC_CHECK_HEADERS])
AN_HEADER([libintl.h],          [AC_CHECK_HEADERS])
AN_HEADER([limits.h],           [AC_CHECK_HEADERS])
AN_HEADER([locale.h],           [AC_CHECK_HEADERS])
AN_HEADER([mach/mach.h],        [AC_CHECK_HEADERS])
AN_HEADER([malloc.h],           [AC_CHECK_HEADERS])
AN_HEADER([memory.h],           [AC_CHECK_HEADERS])
AN_HEADER([mntent.h],           [AC_CHECK_HEADERS])
AN_HEADER([mnttab.h],           [AC_CHECK_HEADERS])
AN_HEADER([netdb.h],            [AC_CHECK_HEADERS])
AN_HEADER([netinet/in.h],       [AC_CHECK_HEADERS])
AN_HEADER([nl_types.h],         [AC_CHECK_HEADERS])
AN_HEADER([nlist.h],            [AC_CHECK_HEADERS])
AN_HEADER([paths.h],            [AC_CHECK_HEADERS])
AN_HEADER([sgtty.h],            [AC_CHECK_HEADERS])
AN_HEADER([shadow.h],           [AC_CHECK_HEADERS])
AN_HEADER([stddef.h],           [AC_CHECK_HEADERS])
AN_HEADER([stdint.h],           [AC_CHECK_HEADERS])
AN_HEADER([stdio_ext.h],        [AC_CHECK_HEADERS])
AN_HEADER([stdlib.h],           [AC_CHECK_HEADERS])
AN_HEADER([string.h],           [AC_CHECK_HEADERS])
AN_HEADER([strings.h],          [AC_CHECK_HEADERS])
AN_HEADER([sys/acl.h],          [AC_CHECK_HEADERS])
AN_HEADER([sys/file.h],         [AC_CHECK_HEADERS])
AN_HEADER([sys/filsys.h],       [AC_CHECK_HEADERS])
AN_HEADER([sys/fs/s5param.h],   [AC_CHECK_HEADERS])
AN_HEADER([sys/fs_types.h],     [AC_CHECK_HEADERS])
AN_HEADER([sys/fstyp.h],        [AC_CHECK_HEADERS])
AN_HEADER([sys/ioctl.h],        [AC_CHECK_HEADERS])
AN_HEADER([sys/mntent.h],       [AC_CHECK_HEADERS])
AN_HEADER([sys/mount.h],        [AC_CHECK_HEADERS])
AN_HEADER([sys/param.h],        [AC_CHECK_HEADERS])
AN_HEADER([sys/socket.h],       [AC_CHECK_HEADERS])
AN_HEADER([sys/statfs.h],       [AC_CHECK_HEADERS])
AN_HEADER([sys/statvfs.h],      [AC_CHECK_HEADERS])
AN_HEADER([sys/systeminfo.h],   [AC_CHECK_HEADERS])
AN_HEADER([sys/time.h],         [AC_CHECK_HEADERS])
AN_HEADER([sys/timeb.h],        [AC_CHECK_HEADERS])
AN_HEADER([sys/vfs.h],          [AC_CHECK_HEADERS])
AN_HEADER([sys/window.h],       [AC_CHECK_HEADERS])
AN_HEADER([syslog.h],           [AC_CHECK_HEADERS])
AN_HEADER([termio.h],           [AC_CHECK_HEADERS])
AN_HEADER([termios.h],          [AC_CHECK_HEADERS])
AN_HEADER([unistd.h],           [AC_CHECK_HEADERS])
AN_HEADER([utime.h],            [AC_CHECK_HEADERS])
AN_HEADER([utmp.h],             [AC_CHECK_HEADERS])
AN_HEADER([utmpx.h],            [AC_CHECK_HEADERS])
AN_HEADER([values.h],           [AC_CHECK_HEADERS])
AN_HEADER([wchar.h],            [AC_CHECK_HEADERS])
AN_HEADER([wctype.h],           [AC_CHECK_HEADERS])



## ------------------------------- ##
## 4. Tests for specific headers.  ##
## ------------------------------- ##


# _AC_CHECK_HEADER_DIRENT(HEADER-FILE,
#                         [ACTION-IF-FOUND], [ACTION-IF-NOT_FOUND])
# -----------------------------------------------------------------
# Like AC_CHECK_HEADER, except also make sure that HEADER-FILE
# defines the type `DIR'.  dirent.h on NextStep 3.2 doesn't.
m4_define([_AC_CHECK_HEADER_DIRENT],
[AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_dirent_$1])dnl
AC_CACHE_CHECK([for $1 that defines DIR], ac_Header,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <$1>
],
				    [if ((DIR *) 0)
return 0;])],
		   [AS_VAR_SET(ac_Header, yes)],
		   [AS_VAR_SET(ac_Header, no)])])
AS_IF([test AS_VAR_GET(ac_Header) = yes], [$2], [$3])[]dnl
AS_VAR_POPDEF([ac_Header])dnl
])# _AC_CHECK_HEADER_DIRENT


# AH_CHECK_HEADERS_DIRENT(HEADERS...)
# -----------------------------------
m4_define([AH_CHECK_HEADERS_DIRENT],
[AC_FOREACH([AC_Header], [$1],
  [AH_TEMPLATE(AS_TR_CPP(HAVE_[]AC_Header),
	       [Define to 1 if you have the <]AC_Header[> header file, and
		it defines `DIR'.])])])


# AC_HEADER_DIRENT
# ----------------
AN_HEADER([dirent.h],   [AC_HEADER_DIRENT])
AN_HEADER([ndir.h],     [AC_HEADER_DIRENT])
AN_HEADER([sys/dir.h],  [AC_HEADER_DIRENT])
AN_HEADER([sys/ndir.h], [AC_HEADER_DIRENT])
AC_DEFUN([AC_HEADER_DIRENT],
[AH_CHECK_HEADERS_DIRENT(dirent.h sys/ndir.h sys/dir.h ndir.h)
ac_header_dirent=no
for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h; do
  _AC_CHECK_HEADER_DIRENT($ac_hdr,
			  [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$ac_hdr), 1)
ac_header_dirent=$ac_hdr; break])
done
# Two versions of opendir et al. are in -ldir and -lx on SCO Xenix.
if test $ac_header_dirent = dirent.h; then
  AC_SEARCH_LIBS(opendir, dir)
else
  AC_SEARCH_LIBS(opendir, x)
fi
])# AC_HEADER_DIRENT


# AC_HEADER_MAJOR
# ---------------
AN_FUNCTION([major],     [AC_HEADER_MAJOR])
AN_FUNCTION([makedev],   [AC_HEADER_MAJOR])
AN_FUNCTION([minor],     [AC_HEADER_MAJOR])
AN_HEADER([sys/mkdev.h], [AC_HEADER_MAJOR])
AC_DEFUN([AC_HEADER_MAJOR],
[AC_CACHE_CHECK(whether sys/types.h defines makedev,
		ac_cv_header_sys_types_h_makedev,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <sys/types.h>]],
				 [[return makedev(0, 0);]])],
		[ac_cv_header_sys_types_h_makedev=yes],
		[ac_cv_header_sys_types_h_makedev=no])
])

if test $ac_cv_header_sys_types_h_makedev = no; then
AC_CHECK_HEADER(sys/mkdev.h,
		[AC_DEFINE(MAJOR_IN_MKDEV, 1,
			   [Define to 1 if `major', `minor', and `makedev' are
			    declared in <mkdev.h>.])])

  if test $ac_cv_header_sys_mkdev_h = no; then
    AC_CHECK_HEADER(sys/sysmacros.h,
		    [AC_DEFINE(MAJOR_IN_SYSMACROS, 1,
			       [Define to 1 if `major', `minor', and `makedev'
				are declared in <sysmacros.h>.])])
  fi
fi
])# AC_HEADER_MAJOR


# AC_HEADER_STAT
# --------------
# FIXME: Shouldn't this be named AC_HEADER_SYS_STAT?
AN_IDENTIFIER([S_ISBLK], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISCHR], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISDIR], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISFIFO], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISLNK], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISREG], [AC_HEADER_STAT])
AN_IDENTIFIER([S_ISSOCK], [AC_HEADER_STAT])
AC_DEFUN([AC_HEADER_STAT],
[AC_CACHE_CHECK(whether stat file-mode macros are broken,
  ac_cv_header_stat_broken,
[AC_EGREP_CPP([You lose], [#include <sys/types.h>
#include <sys/stat.h>

#if defined(S_ISBLK) && defined(S_IFDIR)
# if S_ISBLK (S_IFDIR)
You lose.
# endif
#endif

#if defined(S_ISBLK) && defined(S_IFCHR)
# if S_ISBLK (S_IFCHR)
You lose.
# endif
#endif

#if defined(S_ISLNK) && defined(S_IFREG)
# if S_ISLNK (S_IFREG)
You lose.
# endif
#endif

#if defined(S_ISSOCK) && defined(S_IFREG)
# if S_ISSOCK (S_IFREG)
You lose.
# endif
#endif
], ac_cv_header_stat_broken=yes, ac_cv_header_stat_broken=no)])
if test $ac_cv_header_stat_broken = yes; then
  AC_DEFINE(STAT_MACROS_BROKEN, 1,
	    [Define to 1 if the `S_IS*' macros in <sys/stat.h> do not
	     work properly.])
fi
])# AC_HEADER_STAT


# AC_HEADER_STDBOOL
# -----------------
# Check for stdbool.h that conforms to C99.
AN_IDENTIFIER([bool], [AC_HEADER_STDBOOL])
AN_IDENTIFIER([true], [AC_HEADER_STDBOOL])
AN_IDENTIFIER([false],[AC_HEADER_STDBOOL])
AC_DEFUN([AC_HEADER_STDBOOL],
[AC_CACHE_CHECK([for stdbool.h that conforms to C99],
   [ac_cv_header_stdbool_h],
   [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
      [[
#include <stdbool.h>
#ifndef bool
# error bool is not defined
#endif
#ifndef false
# error false is not defined
#endif
#if false
# error false is not 0
#endif
#ifndef true
# error true is not defined
#endif
#if true != 1
# error true is not 1
#endif
#ifndef __bool_true_false_are_defined
# error __bool_true_false_are_defined is not defined
#endif

	struct s { _Bool s: 1; _Bool t; } s;

	char a[true == 1 ? 1 : -1];
	char b[false == 0 ? 1 : -1];
	char c[__bool_true_false_are_defined == 1 ? 1 : -1];
	char d[(bool) -0.5 == true ? 1 : -1];
	bool e = &s;
	char f[(_Bool) -0.0 == false ? 1 : -1];
	char g[true];
	char h[sizeof (_Bool)];
	char i[sizeof s.t];
      ]],
      [[ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ]])],
      [ac_cv_header_stdbool_h=yes],
      [ac_cv_header_stdbool_h=no])])
AC_CHECK_TYPES([_Bool])
if test $ac_cv_header_stdbool_h = yes; then
  AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
fi
])# AC_HEADER_STDBOOL


# AC_HEADER_STDC
# --------------
# FIXME: I find this list very strange.  It comes from the original
# autoscan list, but I don't think it is useful for the same reason
# that we don't bind AC_PROG_CC to finding a C function calls: if the
# user uses bcmp, then she will certainly have the `#include', and
# therefore, we will trigger AC_HEADER_STDC elsewhere.  --akim 2002-09-28
# FIXME: Err... index and rindex are _not_ to be used... --akim 2002-09-28
AN_FUNCTION([bcmp],     [AC_HEADER_STDC])
AN_FUNCTION([bcopy],    [AC_HEADER_STDC])
AN_FUNCTION([bzero],    [AC_HEADER_STDC])
AN_FUNCTION([index],    [AC_HEADER_STDC])
AN_FUNCTION([memchr],   [AC_HEADER_STDC])
AN_FUNCTION([memcpy],   [AC_HEADER_STDC])
AN_FUNCTION([memmove],  [AC_HEADER_STDC])
AN_FUNCTION([memset],   [AC_HEADER_STDC])
AN_FUNCTION([rindex],   [AC_HEADER_STDC])

AN_HEADER([float.h],    [AC_HEADER_STDC])
AN_HEADER([stdarg.h],   [AC_HEADER_STDC])
AN_HEADER([stddef.h],   [AC_HEADER_STDC])
AN_HEADER([stdlib.h],   [AC_HEADER_STDC])
AN_HEADER([string.h],   [AC_HEADER_STDC])

AC_DEFUN([AC_HEADER_STDC],
[AC_CACHE_CHECK(for ANSI C header files, ac_cv_header_stdc,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <float.h>
]])],
		    [ac_cv_header_stdc=yes],
		    [ac_cv_header_stdc=no])

if test $ac_cv_header_stdc = yes; then
  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
  AC_EGREP_HEADER(memchr, string.h, , ac_cv_header_stdc=no)
fi

if test $ac_cv_header_stdc = yes; then
  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
  AC_EGREP_HEADER(free, stdlib.h, , ac_cv_header_stdc=no)
fi

if test $ac_cv_header_stdc = yes; then
  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
  AC_RUN_IFELSE([AC_LANG_SOURCE(
[[#include <ctype.h>
#if ((' ' & 0x0FF) == 0x020)
# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
#else
# define ISLOWER(c) \
		   (('a' <= (c) && (c) <= 'i') \
		     || ('j' <= (c) && (c) <= 'r') \
		     || ('s' <= (c) && (c) <= 'z'))
# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
#endif

#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
int
main ()
{
  int i;
  for (i = 0; i < 256; i++)
    if (XOR (islower (i), ISLOWER (i))
	|| toupper (i) != TOUPPER (i))
      exit(2);
  exit (0);
}]])], , ac_cv_header_stdc=no, :)
fi])
if test $ac_cv_header_stdc = yes; then
  AC_DEFINE(STDC_HEADERS, 1,
	    [Define to 1 if you have the ANSI C header files.])
fi
])# AC_HEADER_STDC


# AC_HEADER_SYS_WAIT
# ------------------
AN_HEADER([sys/wait.h], [AC_HEADER_SYS_WAIT])
AC_DEFUN([AC_HEADER_SYS_WAIT],
[AC_CACHE_CHECK([for sys/wait.h that is POSIX.1 compatible],
  ac_cv_header_sys_wait_h,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/types.h>
#include <sys/wait.h>
#ifndef WEXITSTATUS
# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
#endif
#ifndef WIFEXITED
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
],
[  int s;
  wait (&s);
  s = WIFEXITED (s) ? WEXITSTATUS (s) : 1;])],
		 [ac_cv_header_sys_wait_h=yes],
		 [ac_cv_header_sys_wait_h=no])])
if test $ac_cv_header_sys_wait_h = yes; then
  AC_DEFINE(HAVE_SYS_WAIT_H, 1,
	    [Define to 1 if you have <sys/wait.h> that is POSIX.1 compatible.])
fi
])# AC_HEADER_SYS_WAIT


# AC_HEADER_TIME
# --------------
AN_IDENTIFIER([timeval],  [AC_HEADER_TIME])
AC_DEFUN([AC_HEADER_TIME],
[AC_CACHE_CHECK([whether time.h and sys/time.h may both be included],
  ac_cv_header_time,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
],
[if ((struct tm *) 0)
return 0;])],
		   [ac_cv_header_time=yes],
		   [ac_cv_header_time=no])])
if test $ac_cv_header_time = yes; then
  AC_DEFINE(TIME_WITH_SYS_TIME, 1,
	    [Define to 1 if you can safely include both <sys/time.h>
	     and <time.h>.])
fi
])# AC_HEADER_TIME


# _AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H
# ----------------------------------
m4_define([_AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H],
[AC_CACHE_CHECK([whether termios.h defines TIOCGWINSZ],
		ac_cv_sys_tiocgwinsz_in_termios_h,
[AC_EGREP_CPP([yes],
	      [#include <sys/types.h>
#include <termios.h>
#ifdef TIOCGWINSZ
  yes
#endif
],
		ac_cv_sys_tiocgwinsz_in_termios_h=yes,
		ac_cv_sys_tiocgwinsz_in_termios_h=no)])
])# _AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H


# _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL
# ----------------------------------
m4_define([_AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL],
[AC_CACHE_CHECK([whether sys/ioctl.h defines TIOCGWINSZ],
		ac_cv_sys_tiocgwinsz_in_sys_ioctl_h,
[AC_EGREP_CPP([yes],
	      [#include <sys/types.h>
#include <sys/ioctl.h>
#ifdef TIOCGWINSZ
  yes
#endif
],
		ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=yes,
		ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=no)])
])# _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL


# AC_HEADER_TIOCGWINSZ
# --------------------
# Look for a header that defines TIOCGWINSZ.
# FIXME: Is this the proper name?  Is this the proper implementation?
# I need more help.
AC_DEFUN([AC_HEADER_TIOCGWINSZ],
[_AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H
if test $ac_cv_sys_tiocgwinsz_in_termios_h != yes; then
  _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL
  if test $ac_cv_sys_tiocgwinsz_in_sys_ioctl_h = yes; then
    AC_DEFINE(GWINSZ_IN_SYS_IOCTL,1,
	      [Define to 1 if `TIOCGWINSZ' requires <sys/ioctl.h>.])
  fi
fi
])# AC_HEADER_TIOCGWINSZ


# AU::AC_UNISTD_H
# ---------------
AU_DEFUN([AC_UNISTD_H],
[AC_CHECK_HEADERS(unistd.h)])


# AU::AC_USG
# ----------
# Define `USG' if string functions are in strings.h.
AU_DEFUN([AC_USG],
[AC_DIAGNOSE([obsolete],
[$0: Remove `AC_MSG_CHECKING', `AC_LINK_IFELSE' and this `AC_WARNING'
when you adjust your code to use HAVE_STRING_H.])dnl
AC_MSG_CHECKING([for BSD string and memory functions])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <strings.h>]],
				[[rindex(0, 0); bzero(0, 0);]])],
	       [AC_MSG_RESULT(yes)],
	       [AC_MSG_RESULT(no)
		AC_DEFINE(USG, 1,
			  [Define to 1 if you do not have <strings.h>, index,
			   bzero, etc... This symbol is obsolete, you should
			   not depend upon it.])])
AC_CHECK_HEADERS(string.h)
])# AU::AC_USG


# AU::AC_MEMORY_H
# ---------------
# To be precise this macro used to be:
#
#   | AC_MSG_CHECKING(whether string.h declares mem functions)
#   | AC_EGREP_HEADER(memchr, string.h, ac_found=yes, ac_found=no)
#   | AC_MSG_RESULT($ac_found)
#   | if test $ac_found = no; then
#   |	AC_CHECK_HEADER(memory.h, [AC_DEFINE(NEED_MEMORY_H)])
#   | fi
#
# But it is better to check for both headers, and alias NEED_MEMORY_H to
# HAVE_MEMORY_H.
AU_DEFUN([AC_MEMORY_H],
[AC_DIAGNOSE([obsolete], [$0: Remove this warning and
`AC_CHECK_HEADER(memory.h, AC_DEFINE(...))' when you adjust your code to
use and HAVE_STRING_H and HAVE_MEMORY_H, not NEED_MEMORY_H.])dnl
AC_CHECK_HEADER(memory.h,
		[AC_DEFINE([NEED_MEMORY_H], 1,
			   [Same as `HAVE_MEMORY_H', don't depend on me.])])
AC_CHECK_HEADERS(string.h memory.h)
])


# AU::AC_DIR_HEADER
# -----------------
# Like calling `AC_HEADER_DIRENT' and `AC_FUNC_CLOSEDIR_VOID', but
# defines a different set of C preprocessor macros to indicate which
# header file is found.
AU_DEFUN([AC_DIR_HEADER],
[AC_HEADER_DIRENT
AC_FUNC_CLOSEDIR_VOID
AC_DIAGNOSE([obsolete],
[$0: Remove this warning and the four `AC_DEFINE' when you
adjust your code to use `AC_HEADER_DIRENT'.])
test ac_cv_header_dirent_dirent_h &&
  AC_DEFINE([DIRENT], 1, [Same as `HAVE_DIRENT_H', don't depend on me.])
test ac_cv_header_dirent_sys_ndir_h &&
  AC_DEFINE([SYSNDIR], 1, [Same as `HAVE_SYS_NDIR_H', don't depend on me.])
test ac_cv_header_dirent_sys_dir_h &&
  AC_DEFINE([SYSDIR], 1, [Same as `HAVE_SYS_DIR_H', don't depend on me.])
test ac_cv_header_dirent_ndir_h &&
  AC_DEFINE([NDIR], 1, [Same as `HAVE_NDIR_H', don't depend on me.])
])