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81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
#serial 8
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# Copyright (C) 2000, 2001, 2004, 2005, 2006 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_LIBSOURCES([__fpending.c, __fpending.h])
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AC_CHECK_HEADERS(stdio_ext.h)
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AC_REPLACE_FUNCS([__fpending])
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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_CHECK_DECLS([__fpending], , , $fp_headers)
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if test $ac_cv_func___fpending = no; then
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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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'# 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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'# 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_TRY_COMPILE(
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[#include <stdio.h>
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],
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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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fi
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])
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