Simplify by assuming __fpending.

Now that Emacs is using the gnulib fpending module,
there's no need for Emacs to have a separate implementation.
* configure.ac (stdio_ext.h, __fpending): Remove now-duplicate checks.
(PENDING_OUTPUT_COUNT, DISPNEW_NEEDS_STDIO_EXT): Remove.
* admin/CPP-DEFINES (PENDING_OUTPUT_COUNT): Remove.
* src/dispnew.c: Include <fpending.h>, not <stdio_ext.h>.
(update_frame_1): Use __fpending, not PENDING_OUTPUT_COUNT.
Do not assume that __fpending's result fits in int.

6 files changed, 24 insertions, 101 deletions

diff --git a/ChangeLog b/ChangeLog
index a344ec765d8..83026bc5065 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2012-11-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Simplify by assuming __fpending.
+        Now that Emacs is using the gnulib fpending module,
+        there's no need for Emacs to have a separate implementation.
+        * configure.ac (stdio_ext.h, __fpending): Remove now-duplicate checks.
+        (PENDING_OUTPUT_COUNT, DISPNEW_NEEDS_STDIO_EXT): Remove.
+
 2012-11-03  Eli Zaretskii  <eliz@gnu.org>
 
         * lib/makefile.w32-in (GNULIBOBJS): Add $(BLD)/fpending.$(O) and
diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index 661cde9c43e..fb217fc22e6 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -425,7 +425,6 @@ ORDINARY_LINK
 O_RDONLY
 O_RDWR
 PAGESIZE
-PENDING_OUTPUT_COUNT
 PREFER_VSUSP
 PTY_ITERATION
 PTY_NAME_SPRINTF
diff --git a/admin/ChangeLog b/admin/ChangeLog
index ccb54a0a9ed..c48faadab16 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Simplify by assuming __fpending.
+        * CPP-DEFINES (PENDING_OUTPUT_COUNT): Remove.
+
 2012-11-03  Glenn Morris  <rgm@gnu.org>
 
         * admin.el (set-copyright): Add msdos/sed2v2.inp.
diff --git a/configure.ac b/configure.ac
index b0711923e1a..9a562a37a8d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1266,7 +1266,7 @@ fi
 dnl checks for header files
 AC_CHECK_HEADERS_ONCE(
   linux/version.h sys/systeminfo.h
-  stdio_ext.h fcntl.h coff.h pty.h
+  fcntl.h coff.h pty.h
   sys/vlimit.h sys/resource.h
   sys/utsname.h pwd.h utmp.h dirent.h util.h)
 
@@ -2874,7 +2874,7 @@ closedir getrusage get_current_dir_name \
 lrand48 setsid \
 fpathconf select euidaccess getpagesize setlocale \
 utimes getrlimit setrlimit setpgid getcwd shutdown getaddrinfo \
-__fpending strsignal setitimer \
+strsignal setitimer \
 sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
 gai_strerror mkstemp getline getdelim fsync sync \
 difftime posix_memalign \
@@ -3650,100 +3650,6 @@ case $opsys in
 esac
 
 
-dnl Used in dispnew.c
-AH_TEMPLATE(PENDING_OUTPUT_COUNT, [Number of chars of output in the
-  buffer of a stdio stream.])
-
-AC_MSG_CHECKING([whether we are using the GNU C library])
-AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
-#include <features.h>
-#ifndef __GNU_LIBRARY__
-# error "this is not the GNU C library"
-#endif
-  ]], [[]])], emacs_glibc=yes, emacs_glibc=no)
-AC_MSG_RESULT([$emacs_glibc])
-
-if test $emacs_glibc = yes; then
-
-  emacs_pending_output=unknown
-
-  case $opsys in
-    gnu | gnu-linux | gnu-kfreebsd )
-      AC_MSG_CHECKING([for style of pending output formalism])
-      dnl In autoconf 2.67 and later, we could use a single test
-      dnl since the preprocessed output is accessible in "conftest.i".
-      AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
-#include <stdio.h>
-#if !defined (_IO_STDIO_H) && !defined (_STDIO_USES_IOSTREAM)
-# error "stdio definitions not found"
-#endif
-        ]], [[]])], emacs_pending_output=new, [])
-
-      if test $emacs_pending_output = unknown; then
-        case $opsys in
-          gnu-linux | gnu-kfreebsd)
-            AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
-#include <stdio.h>
-#ifndef __UCLIBC__
-# error "not using uclibc"
-#endif
-            ]], [[]])], emacs_pending_output=uclibc, emacs_pending_output=old)
-            ;;
-        esac
-      fi
-
-      AC_MSG_RESULT([$emacs_pending_output])
-
-      case $emacs_pending_output in
-        new)
-          dnl New C libio names.
-          AC_DEFINE(PENDING_OUTPUT_COUNT(FILE),
-            [((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)])
-          ;;
-        uclibc)
-          dnl Using the uClibc library.
-          AC_DEFINE(PENDING_OUTPUT_COUNT(FILE),
-            [((FILE)->__bufpos - (FILE)->__bufstart)])
-          ;;
-        old)
-          dnl Old C++ iostream names.
-          AC_DEFINE(PENDING_OUTPUT_COUNT(FILE),
-            [((FILE)->_pptr - (FILE)->_pbase)])
-          ;;
-      esac
-    ;;
-  esac                          dnl opsys
-
-  if test $emacs_pending_output = unknown; then
-    AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->__bufp - (FILE)->__buffer)])
-  fi
-
-else                            dnl !emacs_glibc
-
-  case $opsys in
-    cygwin | darwin | freebsd | netbsd | openbsd )
-      AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->_p - (FILE)->_bf._base)])
-      ;;
-
-    unixware)
-      AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->__ptr - (FILE)->__base)])
-      ;;
-
-    *)
-      dnl HAVE_STDIO_EXT_H && HAVE___FPENDING
-      if test x$ac_cv_header_stdio_ext_h = xyes && \
-        test x$ac_cv_func___fpending = xyes; then
-        AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [__fpending (FILE)])
-        AC_DEFINE(DISPNEW_NEEDS_STDIO_EXT, 1,
-          [Define if dispnew.c should include stdio_ext.h.])
-      else
-        AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->_ptr - (FILE)->_base)])
-      fi
-      ;;
-  esac
-fi                              dnl emacs_glibc
-
-
 dnl Used in vm-limit.c
 AH_TEMPLATE(DATA_START, [Address of the start of the data segment.])
 dnl Used in lisp.h, emacs.c, mem-limits.h
diff --git a/src/ChangeLog b/src/ChangeLog
index 75b70ee4752..29efd9f181c 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2012-11-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Simplify by assuming __fpending.
+        * dispnew.c: Include <fpending.h>, not <stdio_ext.h>.
+        (update_frame_1): Use __fpending, not PENDING_OUTPUT_COUNT.
+        Do not assume that __fpending's result fits in int.
+
 2012-11-04  Paul Eggert  <eggert@cs.ucla.edu>
 
         Remove EMACS_OUTQSIZE+sleep hack.
diff --git a/src/dispnew.c b/src/dispnew.c
index 2ddd29139af..907259a3e94 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -53,9 +53,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "systime.h"
 #include <errno.h>
 
-#ifdef DISPNEW_NEEDS_STDIO_EXT
-#include <stdio_ext.h>
-#endif
+#include <fpending.h>
 
 #if defined (HAVE_TERM_H) && defined (GNU_LINUX)
 #include <term.h>               /* for tgetent */
@@ -4647,7 +4645,7 @@ update_frame_1 (struct frame *f, bool force_p, bool inhibit_id_p)
               FILE *display_output = FRAME_TTY (f)->output;
               if (display_output)
                 {
-                  int outq = PENDING_OUTPUT_COUNT (display_output);
+                  ptrdiff_t outq = __fpending (display_output);
                   if (outq > 900
                       || (outq > 20 && ((i - 1) % preempt_count == 0)))
                     fflush (display_output);