sstream.tcc (pbackfail): Remove redundant NULL pointer check from test involving _M_in_*.

2003-04-20  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/sstream.tcc (pbackfail): Remove redundant
	NULL pointer check from test involving _M_in_*.
	(overflow, seekoff, seekpos): Const qualify bool variables.
	* include/std/std_sstream.h (underflow): Remove redundant
	NULL pointer check from test involving _M_in_*.
	(_M_really_sync): Const qualify bool variables.
	* src/fstream.cc (_M_underflow_common): Remove redundant
	NULL pointer check from test involving _M_in_*, const qualify
	bool variables.

	* include/std/std_streambuf.h (sgetc): Remove redundant
	variable.

From-SVN: r65853

libstdc++-v3/ChangeLog

+2003-04-20  Paolo Carlini  <pcarlini@unitus.it>
+
+	* include/bits/sstream.tcc (pbackfail): Remove redundant
+	NULL pointer check from test involving _M_in_*.
+	(overflow, seekoff, seekpos): Const qualify bool variables.
+	* include/std/std_sstream.h (underflow): Remove redundant
+	NULL pointer check from test involving _M_in_*.
+	(_M_really_sync): Const qualify bool variables.
+	* src/fstream.cc (_M_underflow_common): Remove redundant
+	NULL pointer check from test involving _M_in_*, const qualify
+	bool variables.
+
+	* include/std/std_streambuf.h (sgetc): Remove redundant
+	variable.
+
 2003-04-18  Paolo Carlini  <pcarlini@unitus.it>
 
 	According to 5.9 para 2 (second bullet) for pointers p, q

libstdc++-v3/include/bits/sstream.tcc

@@ -47,8 +47,9 @@ namespace std
     pbackfail(int_type __c)
     {
       int_type __ret = traits_type::eof();
-      bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
-      bool __testpos = this->_M_in_cur && this->_M_in_beg < this->_M_in_cur; 
+      const bool __testeof = 
+	traits_type::eq_int_type(__c, traits_type::eof());
+      const bool __testpos = this->_M_in_beg < this->_M_in_cur; 
       
       // Try to put back __c into input sequence in one of three ways.
       // Order these tests done in is unspecified by the standard.
@@ -80,11 +81,12 @@ namespace std
     basic_stringbuf<_CharT, _Traits, _Alloc>::
     overflow(int_type __c)
     {
-      bool __testout = this->_M_mode & ios_base::out;
+      const bool __testout = this->_M_mode & ios_base::out;
       if (__builtin_expect(!__testout, false))
 	return traits_type::eof();
 
-      bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
+      const bool __testeof =
+	traits_type::eq_int_type(__c, traits_type::eof());
       if (__builtin_expect(__testeof, false))
 	return traits_type::not_eof(__c);
 
@@ -94,7 +96,7 @@ namespace std
       // suit particular needs.
       __size_type __len = std::max(__size_type(_M_string.capacity() + 1),
 				   __size_type(512));
-      bool __testput = this->_M_out_cur < this->_M_out_end;
+      const bool __testput = this->_M_out_cur < this->_M_out_end;
       if (__builtin_expect(!__testput && __len > _M_string.max_size(), false))
 	return traits_type::eof();
 
@@ -123,7 +125,7 @@ namespace std
       pos_type __ret =  pos_type(off_type(-1)); 
       bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
       bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
-      bool __testboth = __testin && __testout && __way != ios_base::cur;
+      const bool __testboth = __testin && __testout && __way != ios_base::cur;
       __testin &= !(__mode & ios_base::out);
       __testout &= !(__mode & ios_base::in);
 
@@ -189,8 +191,8 @@ namespace std
 	  off_type __pos = __sp; // Use streamoff operator to do conversion.
 	  char_type* __beg = NULL;
 	  char_type* __end = NULL;
-	  bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
-	  bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
+	  const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
+	  const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
 	  
 	  // NB: Ordered.
 	  bool __testposi = false;

libstdc++-v3/include/std/std_sstream.h

@@ -190,7 +190,7 @@ namespace std
       virtual int_type
       underflow()
       {
-	if (this->_M_in_cur && this->_M_in_cur < this->_M_in_end)
+	if (this->_M_in_cur < this->_M_in_end)
 	  return traits_type::to_int_type(*gptr());
 	else
 	  return traits_type::eof();
@@ -260,8 +260,8 @@ namespace std
       virtual void
       _M_really_sync(char_type* __base, __size_type __i, __size_type __o)
       {
-	bool __testin = this->_M_mode & ios_base::in;
-	bool __testout = this->_M_mode & ios_base::out;
+	const bool __testin = this->_M_mode & ios_base::in;
+	const bool __testout = this->_M_mode & ios_base::out;
 	__size_type __len = _M_string.size();
 
 	this->_M_buf = __base;

libstdc++-v3/include/std/std_streambuf.h

@@ -452,12 +452,10 @@ namespace std
       int_type 
       sgetc()
       {
-	int_type __ret;
 	if (_M_in_cur < _M_in_end)
-	  __ret = traits_type::to_int_type(*(this->gptr()));
+	  return traits_type::to_int_type(*(this->gptr()));
 	else 
-	  __ret = this->underflow();
-	return __ret;
+	  return this->underflow();
       }
 
       /**

libstdc++-v3/src/fstream.cc

@@ -41,10 +41,10 @@ namespace std
     basic_filebuf<char>::_M_underflow_common(bool __bump)
     {
       int_type __ret = traits_type::eof();
-      bool __testin = _M_mode & ios_base::in;
-      bool __testout = _M_mode & ios_base::out;
+      const bool __testin = _M_mode & ios_base::in;
+      const bool __testout = _M_mode & ios_base::out;
       // Sync with stdio.
-      bool __sync = _M_buf_size <= 1;
+      const bool __sync = _M_buf_size <= 1;
 
       if (__testin)
 	{
@@ -54,7 +54,7 @@ namespace std
 	  if (_M_pback_init)
 	    _M_pback_destroy();
 
-	  if (_M_in_cur && _M_in_cur < _M_in_end)
+	  if (_M_in_cur < _M_in_end)
 	    {
 	      __ret = traits_type::to_int_type(*_M_in_cur);
 	      if (__bump)
@@ -64,8 +64,8 @@ namespace std
 
 	  // Sync internal and external buffers.
 	  // NB: __testget -> __testput as _M_buf_unified here.
-	  bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
-	  bool __testinit = _M_is_indeterminate();
+	  const bool __testget = _M_in_beg < _M_in_cur;
+	  const bool __testinit = _M_is_indeterminate();
 	  if (__testget)
 	    {
 	      if (__testout)
@@ -123,10 +123,10 @@ namespace std
     basic_filebuf<wchar_t>::_M_underflow_common(bool __bump)
     {
       int_type __ret = traits_type::eof();
-      bool __testin = _M_mode & ios_base::in;
-      bool __testout = _M_mode & ios_base::out;
+      const bool __testin = _M_mode & ios_base::in;
+      const bool __testout = _M_mode & ios_base::out;
       // Sync with stdio.
-      bool __sync = _M_buf_size <= 1;
+      const bool __sync = _M_buf_size <= 1;
 
       if (__testin)
 	{
@@ -136,7 +136,7 @@ namespace std
 	  if (_M_pback_init)
 	    _M_pback_destroy();
 
-	  if (_M_in_cur && _M_in_cur < _M_in_end)
+	  if (_M_in_cur < _M_in_end)
 	    {
 	      __ret = traits_type::to_int_type(*_M_in_cur);
 	      if (__bump)
@@ -146,8 +146,8 @@ namespace std
 
 	  // Sync internal and external buffers.
 	  // NB: __testget -> __testput as _M_buf_unified here.
-	  bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
-	  bool __testinit = _M_is_indeterminate();
+	  const bool __testget = _M_in_beg < _M_in_cur;
+	  const bool __testinit = _M_is_indeterminate();
 	  if (__testget)
 	    {
 	      if (__testout)