-#serial 1
+# serial 21
+
+# Copyright (C) 2000-2001, 2004-2013 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.
dnl From Jim Meyering
dnl Using code from emacs, based on suggestions from Paul Eggert
dnl and Ulrich Drepper.
dnl Find out how to determine the number of pending output bytes on a stream.
-dnl Solaris provides __fpending. On other systems, we have to grub around
-dnl in the FILE struct.
+dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems,
+dnl we have to grub around in the FILE struct.
-AC_DEFUN(jm_FUNC_FPENDING,
+AC_DEFUN([gl_FUNC_FPENDING],
[
- AC_CHECK_HEADERS(stdio_ext.h)
- AC_REPLACE_FUNCS([__fpending])
+ AC_CHECK_HEADERS_ONCE([stdio_ext.h])
fp_headers='
-# if HAVE_STDIO_EXT_H
-# include <stdio_ext.h>
-# endif
-'
- AC_CHECK_DECLS([__fpending], , , $fp_headers)
- 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_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
+ #include <stdio.h>
+ #if HAVE_STDIO_EXT_H
+ # include <stdio_ext.h>
+ #endif
+ '
+ AC_CACHE_CHECK([for __fpending], [gl_cv_func___fpending],
+ [
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([$fp_headers],
+ [[return ! __fpending (stdin);]])],
+ [gl_cv_func___fpending=yes],
+ [gl_cv_func___fpending=no])
+ ])
+ if test $gl_cv_func___fpending = yes; then
+ AC_CHECK_DECLS([__fpending], [], [], [$fp_headers])
+ fi
+])
- # Skip each embedded comment.
- case "$ac_expr" in '#'*) continue;; esac
+AC_DEFUN([gl_PREREQ_FPENDING],
+[
+ AC_CACHE_CHECK(
+ [how to determine the number of pending output bytes on a stream],
+ ac_cv_sys_pending_output_n_bytes,
+ [
+ for ac_expr in \
+ \
+ '# glibc2' \
+ 'fp->_IO_write_ptr - fp->_IO_write_base' \
+ \
+ '# traditional Unix' \
+ 'fp->_ptr - fp->_base' \
+ \
+ '# BSD' \
+ 'fp->_p - fp->_bf._base' \
+ \
+ '# SCO, Unixware' \
+ '(fp->__ptr ? fp->__ptr - fp->__base : 0)' \
+ \
+ '# QNX' \
+ '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
+ \
+ '# old glibc?' \
+ 'fp->__bufp - fp->__buffer' \
+ \
+ '# old glibc iostream?' \
+ 'fp->_pptr - fp->_pbase' \
+ \
+ '# emx+gcc' \
+ 'fp->_ptr - fp->_buffer' \
+ \
+ '# Minix' \
+ 'fp->_ptr - fp->_buf' \
+ \
+ '# Plan9' \
+ 'fp->wp - fp->buf' \
+ \
+ '# VMS' \
+ '(*fp)->_ptr - (*fp)->_base' \
+ \
+ '# e.g., DGUX R4.11; the info is not available' \
+ 1 \
+ ; do
- DEFS="$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
+ # Skip each embedded comment.
+ case "$ac_expr" in '#'*) continue;; esac
- ac_cv_sys_pending_output_n_bytes=$ac_expr
- ]
- )
- AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES,
- $ac_cv_sys_pending_output_n_bytes,
- [the number of pending output bytes on stream `fp'])
- fi
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+ [[FILE *fp = stdin; (void) ($ac_expr);]])],
+ [fp_done=yes]
+ )
+ 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'])
])
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