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Viewing changes to gnulib/m4/fpending.m4

  • Committer: stefan
  • Date: 2008-09-05 20:22:13 UTC
  • Revision ID: stefan@lsd-20080905202213-tkhx46qm7rx4ynip
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gnulib/m4/fpending.m4
 
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#serial 10
 
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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_CHECK_HEADERS_ONCE(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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])