dnl CF_FP_ISREADY version: 2 updated: 1998/04/18 20:51:42
dnl -------------
dnl Test for the common variations of stdio structures that we can use to
dnl test if a character is available for reading.
AC_DEFUN([CF_FP_ISREADY],
[
AC_CACHE_CHECK(for file-pointer ready definition,
cf_cv_fp_isready,[
cf_cv_fp_isready=none
while true
do
	read definition
	test -z "$definition" && break
	echo "test-compile $definition" 1>&AC_FD_CC

	AC_TRY_COMPILE([
#include <stdio.h>
#define isready_c(p) $definition
],[int x = isready_c(stdin)],
	[echo "$definition" >conftest.env
	 break])

done <<'CF_EOF'
( (p)->_IO_read_ptr < (p)->_IO_read_end)
( (p)->__cnt > 0)
( (p)->__rptr < (p)->__rend)
( (p)->_cnt > 0)
( (p)->_gptr < (p)->_egptr)
( (p)->_r > 0)
( (p)->_rcount > 0)
( (p)->endr < (p)->endb)
CF_EOF

test -f conftest.env && cf_cv_fp_isready=`cat conftest.env`

])

test "$cf_cv_fp_isready" != none && AC_DEFINE_UNQUOTED(isready_c(p),$cf_cv_fp_isready)

])dnl
