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# Configure a replacement for <strings.h>.
# serial 9
# Copyright (C) 2007, 2009-2023 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.
AC_DEFUN_ONCE([gl_STRINGS_H],
[
dnl Ensure to expand the default settings once only, before all statements
dnl that occur in other macros.
AC_REQUIRE([gl_STRINGS_H_DEFAULTS])
gl_CHECK_NEXT_HEADERS([strings.h])
if test $ac_cv_header_strings_h = yes; then
HAVE_STRINGS_H=1
else
HAVE_STRINGS_H=0
fi
AC_SUBST([HAVE_STRINGS_H])
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use.
gl_WARN_ON_USE_PREPARE([[
/* Minix 3.1.8 has a bug: <sys/types.h> must be included before
<strings.h>. */
#include <sys/types.h>
#include <strings.h>
]], [ffs strcasecmp strncasecmp])
])
# gl_STRINGS_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_STRINGS_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_STRINGS_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_STRINGS_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_STRINGS_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFS])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_STRINGS_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_STRINGS_H_DEFAULTS])
])
AC_DEFUN([gl_STRINGS_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_FFS=1; AC_SUBST([HAVE_FFS])
HAVE_STRCASECMP=1; AC_SUBST([HAVE_STRCASECMP])
HAVE_DECL_STRNCASECMP=1; AC_SUBST([HAVE_DECL_STRNCASECMP])
])
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