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extern/STLport/5.2.1/stlport/stl/_sstream.c

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+/*
+ * Copyright (c) 1999
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Copyright (c) 1999
+ * Boris Fomitchev
+ *
+ * This material is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * Permission to use or copy this software for any purpose is hereby granted
+ * without fee, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+
+#ifndef _STLP_SSTREAM_C
+#define _STLP_SSTREAM_C
+
+#ifndef _STLP_INTERNAL_SSTREAM
+#  include <stl/_sstream.h>
+#endif
+
+#if defined ( _STLP_NESTED_TYPE_PARAM_BUG )
+// no wint_t is supported for this mode
+#  define __BSB_int_type__ int
+#  define __BSB_pos_type__ streampos
+#else
+#  define __BSB_int_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
+#  define __BSB_pos_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
+#endif
+
+_STLP_BEGIN_NAMESPACE
+
+//----------------------------------------------------------------------
+// Non-inline stringbuf member functions.
+
+// Constructors.  Note that the base class constructor sets all of the
+// get and area pointers to null.
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringbuf<_CharT, _Traits, _Alloc>
+  ::basic_stringbuf(ios_base::openmode __mode)
+    : basic_streambuf<_CharT, _Traits>(), _M_mode(__mode), _M_str()
+{}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringbuf<_CharT, _Traits, _Alloc>
+  ::basic_stringbuf(const basic_string<_CharT, _Traits, _Alloc>& __s, ios_base::openmode __mode)
+    : basic_streambuf<_CharT, _Traits>(), _M_mode(__mode), _M_str(__s)
+{
+  _M_set_ptrs();
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringbuf<_CharT, _Traits, _Alloc>::~basic_stringbuf()
+{}
+
+// Set the underlying string to a new value.
+template <class _CharT, class _Traits, class _Alloc>
+void
+basic_stringbuf<_CharT, _Traits, _Alloc>::str(const basic_string<_CharT, _Traits, _Alloc>& __s)
+{
+  _M_str = __s;
+  _M_set_ptrs();
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+void
+basic_stringbuf<_CharT, _Traits, _Alloc>::_M_set_ptrs()
+{
+  _CharT* __data_ptr = _S_start(_M_str);
+  _CharT* __data_end = _S_finish(_M_str);
+  // The initial read position is the beginning of the string.
+  if (_M_mode & ios_base::in) {
+    this->setg(__data_ptr, (_M_mode & ios_base::ate) ? __data_end : __data_ptr, __data_end);
+  }
+
+  // The initial write position is the beginning of the string.
+  if (_M_mode & ios_base::out) {
+    if ( _M_mode & (ios_base::app | ios_base::ate) ) {
+      this->setp( __data_end, __data_end );
+    } else {
+      this->setp( __data_ptr, __data_end );
+      this->pbump((int)_M_str.size()); // initial write position, if we initialized with string 
+    }
+    // this->setp((_M_mode & (ios_base::app | ios_base::ate))? __data_end : __data_ptr, __data_end);
+  }
+}
+
+// Precondition: gptr() >= egptr().  Returns a character, if one is available.
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_int_type__
+basic_stringbuf<_CharT, _Traits, _Alloc>::underflow() {
+  return this->gptr() != this->egptr()
+    ? _Traits::to_int_type(*this->gptr())
+    : _Traits::eof();
+}
+
+// Precondition: gptr() >= egptr().
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_int_type__
+basic_stringbuf<_CharT, _Traits, _Alloc>::uflow() {
+  if (this->gptr() != this->egptr()) {
+    int_type __c = _Traits::to_int_type(*this->gptr());
+    this->gbump(1);
+    return __c;
+  }
+  else
+    return _Traits::eof();
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_int_type__
+basic_stringbuf<_CharT, _Traits, _Alloc>::pbackfail(int_type __c) {
+  if (this->gptr() != this->eback()) {
+    if (!_Traits::eq_int_type(__c, _Traits::eof())) {
+      if (_Traits::eq(_Traits::to_char_type(__c), this->gptr()[-1])) {
+        this->gbump(-1);
+        return __c;
+      }
+      else if (_M_mode & ios_base::out) {
+        this->gbump(-1);
+        *this->gptr() = _Traits::to_char_type(__c);
+        return __c;
+      }
+      else
+        return _Traits::eof();
+    }
+    else {
+      this->gbump(-1);
+      return _Traits::not_eof(__c);
+    }
+  }
+  else
+    return _Traits::eof();
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_int_type__ basic_stringbuf<_CharT, _Traits, _Alloc>::overflow(int_type __c)
+{
+  if (!_Traits::eq_int_type(__c, _Traits::eof())) {
+    if (_M_mode & ios_base::out) {
+      if ( this->pptr() < this->epptr() ) { // just put back in any case
+        _M_str.push_back( _Traits::to_char_type(__c) );
+        this->pbump(1);
+      } else if ( _M_mode & ios_base::in ) {
+        ptrdiff_t __offset = this->gptr() - this->eback();
+        _M_str.push_back(_Traits::to_char_type(__c));
+        _CharT* __data_ptr = _S_start(_M_str);
+        this->setg(__data_ptr, __data_ptr + __offset, _S_finish(_M_str));
+        this->setp(__data_ptr, _S_finish(_M_str));
+        this->pbump((int)_M_str.size());
+      } else {
+        _M_str.push_back( _Traits::to_char_type(__c) );
+        this->setp(_S_start(_M_str), _S_finish(_M_str));
+        this->pbump((int)_M_str.size());
+      }
+      return __c;
+    }
+    return _Traits::eof(); // Overflow always fails if it's read-only
+  }
+  return _Traits::not_eof(__c); // __c is EOF, so we don't have to do anything
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+streamsize
+basic_stringbuf<_CharT, _Traits, _Alloc>::xsputn(const char_type* __s,
+                                                 streamsize __n) {
+  streamsize __nwritten = 0;
+
+  if ((_M_mode & ios_base::out) && __n > 0) {
+    // If the put pointer is somewhere in the middle of the string,
+    // then overwrite instead of append.
+    if ( !_M_str.empty() && this->pbase() == _S_start(_M_str)) {
+      ptrdiff_t __avail = _S_finish(_M_str) - this->pptr();
+      if (__avail > __n) {
+        _Traits::copy(this->pptr(), __s, __STATIC_CAST(size_t, __n));
+        this->pbump((int)__n);
+        return __n;
+      } else {
+        _Traits::copy(this->pptr(), __s, __avail);
+        __nwritten += __avail;
+        __n -= __avail;
+        __s += __avail;
+      }
+    }
+
+    // At this point we know we're appending.
+    _CharT* __data_ptr;
+    if (_M_mode & ios_base::in) {
+      ptrdiff_t __get_offset = this->gptr() - this->eback();
+      _M_str.append(__s, __s + __STATIC_CAST(ptrdiff_t, __n));
+      __data_ptr = _S_start(_M_str);
+      this->setg(__data_ptr, __data_ptr + __get_offset, _S_finish(_M_str));
+    } else {
+      _M_str.append(__s, __s + __STATIC_CAST(ptrdiff_t, __n));
+      __data_ptr = _S_start(_M_str);
+    }
+
+    this->setp(__data_ptr, _S_finish(_M_str));
+    this->pbump((int)_M_str.size());
+    __nwritten += __n;
+  }
+
+  return __nwritten;
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+streamsize
+basic_stringbuf<_CharT, _Traits, _Alloc>::_M_xsputnc(char_type __c,
+                                                     streamsize __n) {
+  streamsize __nwritten = 0;
+
+  if ((_M_mode & ios_base::out) && __n > 0) {
+    // If the put pointer is somewhere in the middle of the string,
+    // then overwrite instead of append.
+    if (this->pbase() == _S_start(_M_str)) {
+      ptrdiff_t __avail = _S_finish(_M_str) - this->pptr();
+      if (__avail > __n) {
+        _Traits::assign(this->pptr(), __STATIC_CAST(size_t, __n), __c);
+        this->pbump(__STATIC_CAST(int, __n));
+        return __n;
+      }
+      else {
+        _Traits::assign(this->pptr(), __avail, __c);
+        __nwritten += __avail;
+        __n -= __avail;
+      }
+    }
+
+    // At this point we know we're appending.
+    size_t __app_size = sizeof(streamsize) > sizeof(size_t) ? __STATIC_CAST(size_t, (min)(__n, __STATIC_CAST(streamsize, _M_str.max_size())))
+                                                            : __STATIC_CAST(size_t, __n);
+    _CharT* __data_ptr;
+    if (this->_M_mode & ios_base::in) {
+      ptrdiff_t __get_offset = this->gptr() - this->eback();
+      _M_str.append(__app_size, __c);
+      __data_ptr = _S_start(_M_str);
+      this->setg(__data_ptr, __data_ptr + __get_offset, _S_finish(_M_str));
+    } else {
+      _M_str.append(__app_size, __c);
+      __data_ptr = _S_start(_M_str);
+    }
+
+    this->setp(__data_ptr, _S_finish(_M_str));
+    this->pbump((int)_M_str.size());
+    __nwritten += __app_size;
+  }
+
+  return __nwritten;
+}
+
+// According to the C++ standard the effects of setbuf are implementation
+// defined, except that setbuf(0, 0) has no effect.  In this implementation,
+// setbuf(<anything>, n), for n > 0, calls reserve(n) on the underlying
+// string.
+template <class _CharT, class _Traits, class _Alloc>
+basic_streambuf<_CharT, _Traits>*
+basic_stringbuf<_CharT, _Traits, _Alloc>::setbuf(_CharT*, streamsize __n) {
+  if (__n > 0) {
+    bool __do_get_area = false;
+    bool __do_put_area = false;
+    ptrdiff_t __offg = 0;
+    ptrdiff_t __offp = 0;
+
+    if (this->pbase() == _S_start(_M_str)) {
+      __do_put_area = true;
+      __offp = this->pptr() - this->pbase();
+    }
+
+    if (this->eback() == _S_start(_M_str)) {
+      __do_get_area = true;
+      __offg = this->gptr() - this->eback();
+    }
+
+    _M_str.reserve(sizeof(streamsize) > sizeof(size_t) ? __STATIC_CAST(size_t, (min)(__n, __STATIC_CAST(streamsize, _M_str.max_size())))
+                                                       : __STATIC_CAST(size_t, __n));
+
+    _CharT* __data_ptr = _S_start(_M_str);
+
+    if (__do_get_area) {
+      this->setg(__data_ptr, __data_ptr + __offg, _S_finish(_M_str));
+    }
+
+    if (__do_put_area) {
+      this->setp(__data_ptr, _S_finish(_M_str));
+      this->pbump((int)__offp);
+    }
+  }
+
+  return this;
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_pos_type__
+basic_stringbuf<_CharT, _Traits, _Alloc>
+  ::seekoff(off_type __off,
+            ios_base::seekdir __dir,
+            ios_base::openmode __mode) {
+  __mode &= _M_mode;
+
+  bool __imode  = (__mode & ios_base::in) != 0;
+  bool __omode = (__mode & ios_base::out) != 0;
+
+  if ( !(__imode || __omode) )
+    return pos_type(off_type(-1));
+
+  if ( (__imode && (this->gptr() == 0)) || (__omode && (this->pptr() == 0)) )
+    return pos_type(off_type(-1));
+
+  streamoff __newoff;
+  switch(__dir) {
+    case ios_base::beg:
+      __newoff = 0;
+      break;
+    case ios_base::end:
+      __newoff = _M_str.size();
+      break;
+    case ios_base::cur:
+      __newoff = __imode ? this->gptr() - this->eback() : this->pptr() - this->pbase();
+      if ( __off == 0 ) {
+        return pos_type(__newoff);
+      }
+      break;
+    default:
+      return pos_type(off_type(-1));
+  }
+
+  __off += __newoff;
+
+  if (__imode) {
+    ptrdiff_t __n = this->egptr() - this->eback();
+
+    if (__off < 0 || __off > __n)
+      return pos_type(off_type(-1));
+    this->setg(this->eback(), this->eback() + __STATIC_CAST(ptrdiff_t, __off),
+                              this->eback() + __STATIC_CAST(ptrdiff_t, __n));
+  }
+
+  if (__omode) {
+    ptrdiff_t __n = this->epptr() - this->pbase();
+
+    if (__off < 0 || __off > __n)
+      return pos_type(off_type(-1));
+    this->setp(this->pbase(), this->pbase() + __n);
+    this->pbump((int)__off);
+  }
+
+  return pos_type(__off);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+__BSB_pos_type__
+basic_stringbuf<_CharT, _Traits, _Alloc>
+  ::seekpos(pos_type __pos, ios_base::openmode __mode) {
+  __mode &= _M_mode;
+
+  bool __imode = (__mode & ios_base::in) != 0;
+  bool __omode = (__mode & ios_base::out) != 0;
+
+  if ( !(__imode || __omode) )
+    return pos_type(off_type(-1));
+
+  if ( (__imode && (this->gptr() == 0)) || (__omode && (this->pptr() == 0)) )
+    return pos_type(off_type(-1));
+
+  const off_type __n = __pos - pos_type(off_type(0));
+
+  if (__imode) {
+    if (__n < 0 || __n > this->egptr() - this->eback())
+      return pos_type(off_type(-1));
+    this->setg(this->eback(), this->eback() + __STATIC_CAST(ptrdiff_t, __n), this->egptr());
+  }
+
+  if (__omode) {
+    if (__n < 0 || size_t(__n) > _M_str.size())
+      return pos_type(off_type(-1));
+
+    this->setp(_S_start(_M_str), _S_finish(_M_str));
+    this->pbump((int)__n);
+  }
+
+  return __pos;
+}
+
+//----------------------------------------------------------------------
+// Non-inline istringstream member functions.
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_istringstream<_CharT, _Traits, _Alloc>
+  ::basic_istringstream(ios_base::openmode __mode)
+    : basic_istream<_CharT, _Traits>(0),
+      _M_buf(__mode | ios_base::in) {
+  this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_istringstream<_CharT, _Traits, _Alloc>
+  ::basic_istringstream(const _String& __str,ios_base::openmode __mode)
+    : basic_istream<_CharT, _Traits>(0),
+      _M_buf(__str, __mode | ios_base::in) {
+  this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_istringstream<_CharT, _Traits, _Alloc>::~basic_istringstream()
+{}
+
+//----------------------------------------------------------------------
+// Non-inline ostringstream member functions.
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_ostringstream<_CharT, _Traits, _Alloc>
+  ::basic_ostringstream(ios_base::openmode __mode)
+    : basic_ostream<_CharT, _Traits>(0),
+      _M_buf(__mode | ios_base::out) {
+  this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_ostringstream<_CharT, _Traits, _Alloc>
+  ::basic_ostringstream(const _String& __str, ios_base::openmode __mode)
+    : basic_ostream<_CharT, _Traits>(0),
+      _M_buf(__str, __mode | ios_base::out) {
+  this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_ostringstream<_CharT, _Traits, _Alloc>::~basic_ostringstream()
+{}
+
+//----------------------------------------------------------------------
+// Non-inline stringstream member functions.
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringstream<_CharT, _Traits, _Alloc>
+  ::basic_stringstream(ios_base::openmode __mode)
+    : basic_iostream<_CharT, _Traits>(0), _M_buf(__mode) {
+   this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringstream<_CharT, _Traits, _Alloc>
+  ::basic_stringstream(const _String& __str, ios_base::openmode __mode)
+    : basic_iostream<_CharT, _Traits>(0), _M_buf(__str, __mode) {
+  this->init(&_M_buf);
+}
+
+template <class _CharT, class _Traits, class _Alloc>
+basic_stringstream<_CharT, _Traits, _Alloc>::~basic_stringstream()
+{}
+
+_STLP_END_NAMESPACE
+
+# undef __BSB_int_type__
+# undef __BSB_pos_type__
+
+#endif /* _STLP_SSTREAM_C */
+
+// Local Variables:
+// mode:C++
+// End: