[v3] libstdc++/9701 (in_avail() part)

[Paolo Carlini <pcarlini at unitus dot it>]

Hi,

tested x86-linux, reviewed by Benjamin.

Paolo.

////////
2003-04-14  Nathan Myers  <ncm at cantrip dot org>
	    Paolo Carlini  <pcarlini at unitus dot it>

	PR libstdc++/9701 (in_avail())
	* include/std/std_streambuf.h (in_avail): Simplify, in_avail
	doesn't care if there is anything in some putback cell.
	* testsuite/27_io/basic_streambuf/in_avail/char/9701-3.cc: Add.

	* testsuite/27_io/basic_filebuf/in_avail/char/1.cc: Remove some
	unused string literals.

diff -urN libstdc++-v3-orig/include/std/std_streambuf.h libstdc++-v3/include/std/std_streambuf.h
--- libstdc++-v3-orig/include/std/std_streambuf.h	2003-04-12 20:54:13.000000000 +0200
+++ libstdc++-v3/include/std/std_streambuf.h	2003-04-14 22:06:19.000000000 +0200
@@ -403,21 +403,8 @@
       streamsize 
       in_avail() 
       { 
-	streamsize __ret;
-	if (_M_in_cur && _M_in_cur < _M_in_end)
-	  {
-	    if (_M_pback_init)
-	      {
-		size_t __save_len =  _M_pback_end_save - _M_pback_cur_save;
-		size_t __pback_len = _M_in_cur - _M_pback;
-		__ret = __save_len - __pback_len;
-	      }
-	    else
-	      __ret = this->egptr() - this->gptr();
-	  }
-	else
-	  __ret = this->showmanyc();
-	return __ret;
+	streamsize __ret = _M_in_end - _M_in_cur;
+	return __ret ? __ret : this->showmanyc();
       }
 
       /**
diff -urN libstdc++-v3-orig/testsuite/27_io/basic_filebuf/in_avail/char/1.cc libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/1.cc
--- libstdc++-v3-orig/testsuite/27_io/basic_filebuf/in_avail/char/1.cc	2003-04-12 18:25:30.000000000 +0200
+++ libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/1.cc	2003-04-14 22:16:10.000000000 +0200
@@ -44,11 +44,6 @@
 const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
 const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
 const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
-const char name_04[] = "filebuf_virtuals-4.txt"; // empty file, need to create
-const char name_05[] = "filebuf_virtuals-5.txt"; // empty file, need to create
-const char name_06[] = "filebuf_virtuals-6.txt"; // empty file, need to create
-const char name_07[] = "filebuf_virtuals-7.txt"; // empty file, need to create
-const char name_08[] = "filebuf_virtuals-8.txt"; // empty file, need to create
 
 class derived_filebuf: public std::filebuf
 {
diff -urN libstdc++-v3-orig/testsuite/27_io/basic_streambuf/in_avail/char/9701-3.cc libstdc++-v3/testsuite/27_io/basic_streambuf/in_avail/char/9701-3.cc
--- libstdc++-v3-orig/testsuite/27_io/basic_streambuf/in_avail/char/9701-3.cc	1970-01-01 01:00:00.000000000 +0100
+++ libstdc++-v3/testsuite/27_io/basic_streambuf/in_avail/char/9701-3.cc	2003-04-14 22:38:06.000000000 +0200
@@ -0,0 +1,59 @@
+// Copyright (C) 2003 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 27.5.2.2.3 Get area
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+class Derived_fbuf : public std::filebuf
+{
+public:
+  const char_type* pub_egptr() const
+  { return egptr(); }
+
+  const char_type* pub_gptr() const
+  { return gptr(); }
+};
+
+// libstdc++/9701 (partial)
+void test01()
+{
+  using namespace std;
+  bool test = true;
+  const char* name = "tmp_file1";
+
+  Derived_fbuf df2;
+  df2.open(name, ios_base::in | ios_base::out | ios_base::trunc);
+
+  df2.sputn("Comomoc", 7);
+
+  df2.pubseekoff(0, ios_base::beg);
+  df2.sbumpc();
+  df2.sputbackc('t');
+
+  VERIFY( df2.pub_gptr() < df2.pub_egptr() );
+  VERIFY( df2.in_avail() == df2.pub_egptr() - df2.pub_gptr() );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}