-#serial 1
+# serial 20
+
+# 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.
-AC_DEFUN(jm_FUNC_FPENDING,
-[
- AC_CHECK_HEADERS(stdio_ext.h)
- AC_FEPLACE_FUNCS([__fpending])
- if test $ac_cv_func___fpending = no; then
- AC_REPLACE_FUNCS(__fpending)
- AC_CACHE_CHECK(
- [how to determine the number of pending output bytes on a stream],
- ac_cv_sys_pending_output_n_bytes,
- [
- fp_save_DEFS=$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
- # Skip each embedded comment.
- case "$ac_expr" in '#'*) continue;; esac
-'
+dnl Find out how to determine the number of pending output bytes on a stream.
+dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems,
+dnl we have to grub around in the FILE struct.
- DEFS="$DEFS -DPENDING_OUTPUT_N_BYTES=$ac_expr"
- AC_TRY_COMPILE(
- [#include <stdio.h>
- ],
- [long unsigned int n = $ac_expr;],
- fp_done=yes
- )
- DEFS=$fp_save_DEFS
- test "$fp_done" = yes && break
- done
- AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES, $ac_expr,
- [the number of pending output bytes on stream `fp'])
- ])
- fi
+AC_DEFUN([gl_FUNC_FPENDING],
+[
+ AC_CHECK_HEADERS_ONCE([stdio_ext.h])
+ AC_CACHE_CHECK([for __fpending], [gl_cv_func___fpending],
+ [
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <stdio.h>
+ #if HAVE_STDIO_EXT_H
+ # include <stdio_ext.h>
+ #endif
+ ]],
+ [[return ! __fpending (stdin);]])],
+ [gl_cv_func___fpending=yes],
+ [gl_cv_func___fpending=no])
+ ])
+])
+AC_DEFUN([gl_PREREQ_FPENDING],
+[
+ AC_CACHE_CHECK(
+ [how to determine the number of pending output bytes on a stream],
+ ac_cv_sys_pending_output_n_bytes,
+ [
+ for ac_expr in \
+ \
+ '# glibc2' \
+ 'fp->_IO_write_ptr - fp->_IO_write_base' \
+ \
+ '# traditional Unix' \
+ 'fp->_ptr - fp->_base' \
+ \
+ '# BSD' \
+ 'fp->_p - fp->_bf._base' \
+ \
+ '# SCO, Unixware' \
+ '(fp->__ptr ? fp->__ptr - fp->__base : 0)' \
+ \
+ '# QNX' \
+ '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
+ \
+ '# old glibc?' \
+ 'fp->__bufp - fp->__buffer' \
+ \
+ '# old glibc iostream?' \
+ 'fp->_pptr - fp->_pbase' \
+ \
+ '# emx+gcc' \
+ 'fp->_ptr - fp->_buffer' \
+ \
+ '# Minix' \
+ 'fp->_ptr - fp->_buf' \
+ \
+ '# Plan9' \
+ 'fp->wp - fp->buf' \
+ \
+ '# VMS' \
+ '(*fp)->_ptr - (*fp)->_base' \
+ \
+ '# e.g., DGUX R4.11; the info is not available' \
+ 1 \
+ ; do
+ # Skip each embedded comment.
+ case "$ac_expr" in '#'*) continue;; esac
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+ [[FILE *fp = stdin; (void) ($ac_expr);]])],
+ [fp_done=yes]
+ )
+ test "$fp_done" = yes && break
+ done
- if test $fu_cv_sys_struct_timespec = yes; then
- AC_DEFINE_UNQUOTED(HAVE_STRUCT_TIMESPEC, 1,
- [Define if struct timespec is declared in <time.h>. ])
- fi
+ ac_cv_sys_pending_output_n_bytes=$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'])
])
projects / gnulib.git / blobdiff