Mercurial > gnulib
view m4/dirfd.m4 @ 40214:452ab00796c7
Fix undefined behaviour.
* lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to
'unsigned int', to avoid shift operations on 'int'.
* lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size.
* tests/test-count-leading-zeros.c (main): Use a random number that has
as many bits as TYPE, not only 2*15 or 2*31 bits.
* tests/test-count-trailing-zeros.c (main): Likewise.
* tests/test-count-one-bits.c (main): Likewise.
* tests/test-memmem.c: Don't include "null-ptr.h".
(main): Use zerosize_ptr() instead of null_ptr().
* modules/memmem-tests (Files): Remove tests/null-ptr.h.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 20:32:25 +0100 |
parents | b06060465f09 |
children |
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# serial 26 -*- Autoconf -*- dnl Find out how to get the file descriptor associated with an open DIR*. # Copyright (C) 2001-2006, 2008-2019 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. dnl From Jim Meyering AC_DEFUN([gl_FUNC_DIRFD], [ AC_REQUIRE([gl_DIRENT_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles dnl Persuade glibc <dirent.h> to declare dirfd(). AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_CHECK_FUNCS([dirfd]) AC_CHECK_DECLS([dirfd], , , [[#include <sys/types.h> #include <dirent.h>]]) if test $ac_cv_have_decl_dirfd = no; then HAVE_DECL_DIRFD=0 fi AC_CACHE_CHECK([whether dirfd is a macro], [gl_cv_func_dirfd_macro], [AC_EGREP_CPP([dirent_header_defines_dirfd], [ #include <sys/types.h> #include <dirent.h> #ifdef dirfd dirent_header_defines_dirfd #endif], [gl_cv_func_dirfd_macro=yes], [gl_cv_func_dirfd_macro=no])]) # Use the replacement if we have no function or macro with that name, # or if OS/2 kLIBC whose dirfd() does not work. # Replace only if the system declares dirfd already. case $ac_cv_func_dirfd,$gl_cv_func_dirfd_macro,$host_os,$ac_cv_have_decl_dirfd in no,no,*,yes | *,*,os2*,yes) REPLACE_DIRFD=1 AC_DEFINE([REPLACE_DIRFD], [1], [Define to 1 if gnulib's dirfd() replacement is used.]);; esac ]) dnl Prerequisites of lib/dirfd.c. AC_DEFUN([gl_PREREQ_DIRFD], [ AC_CACHE_CHECK([how to get the file descriptor associated with an open DIR*], [gl_cv_sys_dir_fd_member_name], [ dirfd_save_CFLAGS=$CFLAGS for ac_expr in d_fd dd_fd; do CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include <sys/types.h> #include <dirent.h>]], [[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;]])], [dir_fd_found=yes] ) CFLAGS=$dirfd_save_CFLAGS test "$dir_fd_found" = yes && break done test "$dir_fd_found" = yes || ac_expr=no_such_member gl_cv_sys_dir_fd_member_name=$ac_expr ] ) if test $gl_cv_sys_dir_fd_member_name != no_such_member; then AC_DEFINE_UNQUOTED([DIR_FD_MEMBER_NAME], [$gl_cv_sys_dir_fd_member_name], [the name of the file descriptor member of DIR]) fi AH_VERBATIM([DIR_TO_FD], [#ifdef DIR_FD_MEMBER_NAME # define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME) #else # define DIR_TO_FD(Dir_p) -1 #endif ]) ])