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# getcwd.m4 - check for working getcwd that is compatible with glibc
# Copyright (C) 2001, 2003-2007, 2009-2020 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# Written by Paul Eggert.
# serial 18
AC_DEFUN([gl_FUNC_GETCWD_NULL],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_HEADERS_ONCE([unistd.h])
AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
[gl_cv_func_getcwd_null],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
# include <stdlib.h>
# if HAVE_UNISTD_H
# include <unistd.h>
# else /* on Windows with MSVC */
# include <direct.h>
# endif
# ifndef getcwd
char *getcwd ();
# endif
]], [[
#if defined _WIN32 && ! defined __CYGWIN__
/* mingw cwd does not start with '/', but getcwd does allocate.
However, mingw fails to honor non-zero size. */
#else
if (chdir ("/") != 0)
return 1;
else
{
char *f = getcwd (NULL, 0);
if (! f)
return 2;
if (f[0] != '/')
{ free (f); return 3; }
if (f[1] != '\0')
{ free (f); return 4; }
free (f);
return 0;
}
#endif
]])],
[gl_cv_func_getcwd_null=yes],
[gl_cv_func_getcwd_null=no],
[[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_getcwd_null="guessing yes";;
# Guess yes on musl systems.
*-musl*) gl_cv_func_getcwd_null="guessing yes";;
# Guess yes on Cygwin.
cygwin*) gl_cv_func_getcwd_null="guessing yes";;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_getcwd_null="$gl_cross_guess_normal";;
esac
]])])
])
AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
[
AC_CACHE_CHECK([for getcwd with POSIX signature],
[gl_cv_func_getcwd_posix_signature],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <unistd.h>]],
[[extern
#ifdef __cplusplus
"C"
#endif
char *getcwd (char *, size_t);
]])
],
[gl_cv_func_getcwd_posix_signature=yes],
[gl_cv_func_getcwd_posix_signature=no])
])
])
dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
dnl that either the system getcwd is robust, or that calling code is okay
dnl with spurious failures when run from a directory with an absolute name
dnl larger than 4k bytes.
dnl
dnl Assumes that getcwd exists; if you are worried about obsolete
dnl platforms that lacked getcwd(), then you need to use the GPL module.
AC_DEFUN([gl_FUNC_GETCWD_LGPL],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_GETCWD_NULL])
AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
*yes,yes) ;;
*)
dnl Minimal replacement lib/getcwd-lgpl.c.
REPLACE_GETCWD=1
;;
esac
])
dnl Check for all known getcwd bugs; useful for a program likely to be
dnl executed from an arbitrary location.
AC_DEFUN([gl_FUNC_GETCWD],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_GETCWD_NULL])
AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
gl_abort_bug=no
case "$host_os" in
mingw*)
gl_cv_func_getcwd_path_max=yes
;;
*)
gl_FUNC_GETCWD_PATH_MAX
case "$gl_cv_func_getcwd_null" in
*yes)
gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
;;
esac
;;
esac
dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
dnl if appropriate.
case "$gl_cv_func_getcwd_path_max" in
*"no" | *"no, it has the AIX bug") ;;
*)
AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
[Define to 1 if getcwd minimally works, that is, its result can be
trusted when it succeeds.])
;;
esac
case "$gl_cv_func_getcwd_path_max" in
*"no, but it is partly working")
AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
[Define to 1 if getcwd works, except it sometimes fails when it
shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
;;
*"yes, but with shorter paths")
AC_DEFINE([HAVE_GETCWD_SHORTER], [1],
[Define to 1 if getcwd works, but with shorter paths
than is generally tested with the replacement.])
;;
esac
if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
|| test $gl_cv_func_getcwd_posix_signature != yes \
|| { case "$gl_cv_func_getcwd_path_max" in *yes*) false;; *) true;; esac; } \
|| test $gl_abort_bug = yes; then
REPLACE_GETCWD=1
fi
])
# Prerequisites of lib/getcwd.c, when full replacement is in effect.
AC_DEFUN([gl_PREREQ_GETCWD],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
:
])
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