Mercurial > gnulib
view m4/readlink.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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# readlink.m4 serial 14 dnl Copyright (C) 2003, 2007, 2009-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_READLINK], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CHECK_FUNCS_ONCE([readlink]) if test $ac_cv_func_readlink = no; then HAVE_READLINK=0 else AC_CACHE_CHECK([whether readlink signature is correct], [gl_cv_decl_readlink_works], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include <unistd.h> /* Cause compilation failure if original declaration has wrong type. */ ssize_t readlink (const char *, char *, size_t);]])], [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) dnl Solaris 9 ignores trailing slash. dnl FreeBSD 7.2 dereferences only one level of links with trailing slash. AC_CACHE_CHECK([whether readlink handles trailing slash correctly], [gl_cv_func_readlink_works], [# We have readlink, so assume ln -s works. ln -s conftest.no-such conftest.link ln -s conftest.link conftest.lnk2 AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <unistd.h> ]], [[char buf[20]; return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])], [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no], [case "$host_os" in # Guess yes on Linux systems. linux-* | linux) gl_cv_func_readlink_works="guessing yes" ;; # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_readlink_works="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_readlink_works="guessing no" ;; esac ]) rm -f conftest.link conftest.lnk2]) case "$gl_cv_func_readlink_works" in *yes) if test "$gl_cv_decl_readlink_works" != yes; then REPLACE_READLINK=1 fi ;; *) AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink fails to recognize a trailing slash.]) REPLACE_READLINK=1 ;; esac fi ]) # Like gl_FUNC_READLINK, except prepare for separate compilation # (no REPLACE_READLINK, no AC_LIBOBJ). AC_DEFUN([gl_FUNC_READLINK_SEPARATE], [ AC_CHECK_FUNCS_ONCE([readlink]) gl_PREREQ_READLINK ]) # Prerequisites of lib/readlink.c. AC_DEFUN([gl_PREREQ_READLINK], [ : ])