X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffpending.m4;h=33a5c94c3a3732abfda755f55670c19a889e6bab;hb=5ba3e2240b3f1bba41db8a6f96363009f6d71fad;hp=dab08032a20268f075f1c1246df180bfdbd65e64;hpb=d62b599b13554b112db392b7320f75e913bf6986;p=gnulib.git

diff --git a/m4/fpending.m4 b/m4/fpending.m4
index dab08032a..33a5c94c3 100644
--- a/m4/fpending.m4
+++ b/m4/fpending.m4
@@ -1,70 +1,90 @@
-#serial 1
+# serial 19
+
+# Copyright (C) 2000-2001, 2004-2012 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,
+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.
+
+AC_DEFUN([gl_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
+  AC_CHECK_HEADERS_ONCE([stdio_ext.h])
+  AC_CHECK_FUNCS_ONCE([__fpending])
+  fp_headers='
+#     include <stdio.h>
+#     if HAVE_STDIO_EXT_H
+#      include <stdio_ext.h>
+#     endif
 '
+  AC_CHECK_DECLS([__fpending], , , $fp_headers)
+])
 
-	    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_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'])
 ])