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#serial 1
dnl From Jim Meyering
dnl Using code from emacs, based on suggestions from Paul Eggert
dnl and Ulrich Drepper.
AC_DEFUN(jm_FUNC_FPENDING,
[
AC_CHECK_HEADERS(stdio_ext.h)
AC_REPLACE_FUNCS([__fpending])
if test $ac_cv_func___fpending = no; then
AC_CACHE_CHECK(
[how to determine the number of pending output bytes on a stream],
ac_cv_sys_pending_output_n_bytes,
[
fp_save_DEFS=$DEFS
for ac_expr in \
\
'# glibc2' \
'fp->_IO_write_ptr - fp->_IO_write_x_base' \
\
'# traditional Unix' \
'fp->_ptr - fp->_base' \
\
'# BSD' \
'fp->_p - fp->_bf._base' \
\
'# SCO, Unixware' \
'fp->__ptr - fp->__base' \
\
'# old glibc?' \
'fp->__bufp - fp->__buffer' \
\
'# old glibc iostream?' \
'fp->_pptr - fp->_pbase' \
\
'# VMS' \
'(*fp)->_ptr - (*fp)->_base' \
\
'# e.g., DGUX R4.11; the info is not available' \
1 \
; do
# Skip each embedded comment.
case "$ac_expr" in '#'*) continue;; esac
DEFS="$DEFS -DPENDING_OUTPUT_N_BYTES=$ac_expr"
AC_TRY_COMPILE(
[#include <stdio.h>
],
[FILE *fp = stdin; (void) ($ac_expr);],
fp_done=yes
)
DEFS=$fp_save_DEFS
test "$fp_done" = yes && break
done
ac_cv_sys_pending_output_n_bytes=$ac_expr
]
)
AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES,
$ac_cv_sys_pending_output_n_bytes,
[the number of pending output bytes on stream `fp'])
fi
])
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