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100 lines
4.5 KiB
Plaintext
100 lines
4.5 KiB
Plaintext
# serial 21
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# Copyright (C) 2000-2001, 2004-2015 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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dnl From Jim Meyering
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dnl Using code from emacs, based on suggestions from Paul Eggert
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dnl and Ulrich Drepper.
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dnl Find out how to determine the number of pending output bytes on a stream.
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dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems,
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dnl we have to grub around in the FILE struct.
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AC_DEFUN([gl_FUNC_FPENDING],
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[
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AC_CHECK_HEADERS_ONCE([stdio_ext.h])
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fp_headers='
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#include <stdio.h>
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#if HAVE_STDIO_EXT_H
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# include <stdio_ext.h>
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#endif
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'
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AC_CACHE_CHECK([for __fpending], [gl_cv_func___fpending],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM([$fp_headers],
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[[return ! __fpending (stdin);]])],
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[gl_cv_func___fpending=yes],
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[gl_cv_func___fpending=no])
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])
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if test $gl_cv_func___fpending = yes; then
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AC_CHECK_DECLS([__fpending], [], [], [$fp_headers])
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fi
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])
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AC_DEFUN([gl_PREREQ_FPENDING],
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[
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AC_CACHE_CHECK(
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[how to determine the number of pending output bytes on a stream],
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ac_cv_sys_pending_output_n_bytes,
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[
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for ac_expr in \
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\
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'# glibc2' \
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'fp->_IO_write_ptr - fp->_IO_write_base' \
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\
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'# traditional Unix' \
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'fp->_ptr - fp->_base' \
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\
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'# BSD' \
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'fp->_p - fp->_bf._base' \
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\
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'# SCO, Unixware' \
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'(fp->__ptr ? fp->__ptr - fp->__base : 0)' \
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\
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'# QNX' \
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'(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
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\
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'# old glibc?' \
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'fp->__bufp - fp->__buffer' \
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\
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'# old glibc iostream?' \
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'fp->_pptr - fp->_pbase' \
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\
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'# emx+gcc' \
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'fp->_ptr - fp->_buffer' \
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\
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'# Minix' \
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'fp->_ptr - fp->_buf' \
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\
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'# Plan9' \
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'fp->wp - fp->buf' \
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\
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'# VMS' \
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'(*fp)->_ptr - (*fp)->_base' \
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\
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'# e.g., DGUX R4.11; the info is not available' \
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1 \
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; do
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# Skip each embedded comment.
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case "$ac_expr" in '#'*) continue;; esac
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
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[[FILE *fp = stdin; (void) ($ac_expr);]])],
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[fp_done=yes]
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)
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test "$fp_done" = yes && break
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done
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ac_cv_sys_pending_output_n_bytes=$ac_expr
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]
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)
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AC_DEFINE_UNQUOTED([PENDING_OUTPUT_N_BYTES],
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$ac_cv_sys_pending_output_n_bytes,
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[the number of pending output bytes on stream 'fp'])
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])
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