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# strchrnul.m4 serial 9
dnl Copyright (C) 2003, 2007, 2009-2020 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_STRCHRNUL],
[
dnl Persuade glibc <string.h> to declare strchrnul().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_CHECK_FUNCS([strchrnul])
if test $ac_cv_func_strchrnul = no; then
HAVE_STRCHRNUL=0
else
AC_CACHE_CHECK([whether strchrnul works],
[gl_cv_func_strchrnul_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <string.h> /* for strchrnul */
]], [[const char *buf = "a";
return strchrnul (buf, 'b') != buf + 1;
]])],
[gl_cv_func_strchrnul_works=yes],
[gl_cv_func_strchrnul_works=no],
[dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10
AC_EGREP_CPP([Lucky user],
[
#if defined __CYGWIN__
#include <cygwin/version.h>
#if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9)
Lucky user
#endif
#else
Lucky user
#endif
],
[gl_cv_func_strchrnul_works="guessing yes"],
[gl_cv_func_strchrnul_works="guessing no"])
])
])
case "$gl_cv_func_strchrnul_works" in
*yes) ;;
*) REPLACE_STRCHRNUL=1 ;;
esac
fi
])
# Prerequisites of lib/strchrnul.c.
AC_DEFUN([gl_PREREQ_STRCHRNUL], [:])
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