streambuf.tcc (basic_streambuf::xsgetn): Const-ify some variables.

2003-05-01  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/streambuf.tcc (basic_streambuf::xsgetn):
	Const-ify some variables.
	(basic_streambuf::xsputn): Likewise; change the type of some
	variables to size_t.
	(__copy_streambufs): Change some variables to size_t.

2003-05-01  Paolo Carlini  <pcarlini@unitus.it>

	* include/std/std_sstream.h (str()): Avoid constructing
	a basic_string temporary not only when it would turn out
	to be zero-sized but also when identical to the current
	_M_string buffer.

From-SVN: r66334

3 files changed, 33 insertions, 21 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 70fafd0..92b8a33 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,20 @@
 2003-05-01  Paolo Carlini  <pcarlini@unitus.it>
 
+	* include/bits/streambuf.tcc (basic_streambuf::xsgetn):
+	Const-ify some variables.
+	(basic_streambuf::xsputn): Likewise; change the type of some
+	variables to size_t.
+	(__copy_streambufs): Change some variables to size_t.
+
+2003-05-01  Paolo Carlini  <pcarlini@unitus.it>
+
+	* include/std/std_sstream.h (str()): Avoid constructing
+	a basic_string temporary not only when it would turn out
+	to be zero-sized but also when identical to the current
+	_M_string buffer.
+
+2003-05-01  Paolo Carlini  <pcarlini@unitus.it>
+
 	* include/ext/stdio_filebuf.h
 	(stdio_filebuf(int, std::ios_base::openmode, bool, size_t),
 	stdio_filebuf(std::__c_file*, std::ios_base::openmode, size_t)):
diff --git a/libstdc++-v3/include/bits/streambuf.tcc b/libstdc++-v3/include/bits/streambuf.tcc
index 1d1843f..e4aab0c 100644
--- a/libstdc++-v3/include/bits/streambuf.tcc
+++ b/libstdc++-v3/include/bits/streambuf.tcc
@@ -114,11 +114,11 @@ namespace std
       streamsize __ret = 0;
       while (__ret < __n)
 	{
-	  size_t __buf_len = _M_in_end - _M_in_cur;
+	  const size_t __buf_len = _M_in_end - _M_in_cur;
 	  if (__buf_len > 0)
 	    {
-	      size_t __remaining = __n - __ret;
-	      size_t __len = std::min(__buf_len, __remaining);
+	      const size_t __remaining = __n - __ret;
+	      const size_t __len = std::min(__buf_len, __remaining);
 	      traits_type::copy(__s, _M_in_cur, __len);
 	      __ret += __len;
 	      __s += __len;
@@ -127,7 +127,7 @@ namespace std
 	  
 	  if (__ret < __n)
 	    {
-	      int_type __c = this->uflow();  
+	      const int_type __c = this->uflow();  
 	      if (!traits_type::eq_int_type(__c, traits_type::eof()))
 		{
 		  traits_type::assign(*__s++, traits_type::to_char_type(__c));
@@ -148,11 +148,11 @@ namespace std
       streamsize __ret = 0;
       while (__ret < __n)
 	{
-	  off_type __buf_len = _M_out_end - _M_out_cur;
+	  const size_t __buf_len = _M_out_end - _M_out_cur;
 	  if (__buf_len > 0)
 	    {
-	      off_type __remaining = __n - __ret;
-	      off_type __len = std::min(__buf_len, __remaining);
+	      const size_t __remaining = __n - __ret;
+	      const size_t __len = std::min(__buf_len, __remaining);
 	      traits_type::copy(_M_out_cur, __s, __len);
 	      __ret += __len;
 	      __s += __len;
@@ -161,7 +161,7 @@ namespace std
 
 	  if (__ret < __n)
 	    {
-	      int_type __c = this->overflow(traits_type::to_int_type(*__s));
+	      const int_type __c = this->overflow(traits_type::to_int_type(*__s));
 	      if (!traits_type::eq_int_type(__c, traits_type::eof()))
 		{
 		  ++__ret;
@@ -185,7 +185,6 @@ namespace std
 		      basic_streambuf<_CharT, _Traits>* __sbout) 
   {
       typedef typename _Traits::int_type	int_type;
-      typedef typename _Traits::off_type	off_type;
 
       streamsize __ret = 0;
       try 
@@ -193,8 +192,8 @@ namespace std
 	  for (;;)
   	    {
 	      streamsize __xtrct;
-	      const off_type __avail = __sbin->_M_in_end
-		                       - __sbin->_M_in_cur;
+	      const size_t __avail = __sbin->_M_in_end
+		                     - __sbin->_M_in_cur;
  	      if (__avail)
 		{
 		  __xtrct = __sbout->sputn(__sbin->_M_in_cur, __avail);
@@ -206,8 +205,8 @@ namespace std
  	      else 
 		{
 		  streamsize __charsread;
-		  const off_type __size = __sbout->_M_out_end
-		                          - __sbout->_M_out_cur;
+		  const size_t __size = __sbout->_M_out_end
+		                        - __sbout->_M_out_cur;
 		  if (__size)
 		    {
 		      _CharT* __buf =
diff --git a/libstdc++-v3/include/std/std_sstream.h b/libstdc++-v3/include/std/std_sstream.h
index 10fe057..dcfdea6 100644
--- a/libstdc++-v3/include/std/std_sstream.h
+++ b/libstdc++-v3/include/std/std_sstream.h
@@ -140,14 +140,12 @@ namespace std
 	    // represents the size of the initial string used to
 	    // created the buffer, and may not be the correct size of
 	    // the current stringbuf internal buffer.
-	    __size_type __len = _M_string.size();
-	    __size_type __nlen = this->_M_out_lim - this->_M_out_beg;
-	    if (__nlen)
-	      {
-		__len = std::max(__nlen, __len);
-		__ret = __string_type(this->_M_out_beg, 
-				      this->_M_out_beg + __len);
-	      }
+	    const __size_type __len = _M_string.size();
+	    const __size_type __nlen = this->_M_out_lim
+	                               - this->_M_out_beg;
+	    if (__nlen > __len)
+	      __ret = __string_type(this->_M_out_beg, 
+				    this->_M_out_beg + __nlen);
 	  }
 	return __ret;
       }