Update.

2001-07-18  Ulrich Drepper  <drepper@redhat.com>

	* libio/filedoalloc.c (_IO_file_doallocate): A few more minor
	cleanups and improvements.

2001-07-18  Andreas Schwab  <schwab@suse.de>

	* posix/regex.c (WORDCHAR_P) [WCHAR]: Also return true for the
	underscore character.

2001-07-18  Jakub Jelinek  <jakub@redhat.com>

	* malloc/malloc (new_heap): Don't call munmap for zero length.

2001-07-18  Ulrich Drepper  <drepper@redhat.com>

	* libio/filedoalloc.c (_IO_file_doallocate): Use DEV_TTY_P if
	available to determine whether descriptor is for tty before
	calling isatty.

	* sysdeps/unix/sysv/linux/device-nrs.h: Define DEV_TTY_P.
	* sysdeps/generic/device-nrs.h: Likewise.

1 files changed, 17 insertions, 18 deletions

diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c
index 1cabae83b5..c2e849a736 100644
--- a/libio/filedoalloc.c
+++ b/libio/filedoalloc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1997, 2001 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -58,6 +58,8 @@
 #ifdef _LIBC
 # undef isatty
 # define isatty(Fd) __isatty (Fd)
+
+# include <device-nrs.h>
 #endif
 
 /*
@@ -73,7 +75,6 @@ _IO_file_doallocate (fp)
      _IO_FILE *fp;
 {
   _IO_size_t size;
-  int couldbetty;
   char *p;
   struct _G_stat64 st;
 
@@ -82,31 +83,29 @@ _IO_file_doallocate (fp)
      function it points to.  This is to make sure _IO_cleanup gets called
      on exit.  We call it from _IO_file_doallocate, since that is likely
      to get called by any program that does buffered I/O. */
-  if (_IO_cleanup_registration_needed)
+  if (__builtin_expect (_IO_cleanup_registration_needed != NULL, 0))
     (*_IO_cleanup_registration_needed) ();
 #endif
 
-  if (fp->_fileno < 0 || _IO_SYSSTAT (fp, &st) < 0)
+  size = _IO_BUFSIZ;
+  if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0)
     {
-      couldbetty = 0;
-      size = _IO_BUFSIZ;
-#if 0
-      /* do not try to optimise fseek() */
-      fp->_flags |= __SNPT;
+      if (S_ISCHR (st.st_mode))
+	{
+	  /* Possibly a tty.  */
+	  if (
+#ifdef DEV_TTY_P
+	      DEV_TTY_P (st.st_rdev) ||
 #endif
-    }
-  else
-    {
-      couldbetty = S_ISCHR (st.st_mode);
+	      isatty (fp->_fileno))
+	    fp->_flags |= _IO_LINE_BUF;
+	}
 #if _IO_HAVE_ST_BLKSIZE
-      size = st.st_blksize <= 0 ? _IO_BUFSIZ : st.st_blksize;
-#else
-      size = _IO_BUFSIZ;
+      if (st.st_blksize > 0)
+	size = st.st_blksize;
 #endif
     }
   ALLOC_BUF (p, size, EOF);
   _IO_setb (fp, p, p + size, 1);
-  if (couldbetty && isatty (fp->_fileno))
-    fp->_flags |= _IO_LINE_BUF;
   return 1;
 }