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OS/2 Shareware BBS: 10 Tools
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stlpt453.zip
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STLport-4.5.3
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stlport
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_sstream.c
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2002-02-02
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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_SSTREAM_H
# include <stl/_sstream.h>
#endif
# if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION)
# 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 = __CONST_CAST(_CharT*,_M_str.data());
_CharT* __data_end = __data_ptr + _M_str.size();
// The initial read position is the beginning of the string.
if (_M_mode & ios_base::in)
this->setg(__data_ptr, __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)
this->setp(__data_end, __data_end);
else
this->setp(__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() = __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)
{
// fbp : reverse order of "ifs" to pass Dietmar's test.
// Apparently, standard allows overflow with eof even for read-only streams.
if (!_Traits::eq_int_type(__c, _Traits::eof())) {
if (_M_mode & ios_base::out) {
if (!(_M_mode & ios_base::in)) {
// It's a write-only streambuf, so we can use special append buffer.
if (this->pptr() == this->epptr())
this->_M_append_buffer();
if (this->pptr() != this->epptr()) {
*this->pptr() = _Traits::to_char_type(__c);
this->pbump(1);
return __c;
}
else
return _Traits::eof();
}
else {
// We're not using a special append buffer, just the string itself.
if (this->pptr() == this->epptr()) {
ptrdiff_t __offset = this->gptr() - this->eback();
_M_str.push_back(_Traits::to_char_type(__c));
_CharT* __data_ptr = __CONST_CAST(_CharT*,_M_str.data());
size_t __data_size = _M_str.size();
this->setg(__data_ptr, __data_ptr + __offset, __data_ptr+__data_size);
this->setp(__data_ptr, __data_ptr + __data_size);
this->pbump((int)__data_size);
return __c;
}
else {
*this->pptr() = _Traits::to_char_type(__c);
this->pbump(1);
return __c;
}
}
}
else // Overflow always fails if it's read-only
return _Traits::eof();
}
else // __c is EOF, so we don't have to do anything
return _Traits::not_eof(__c);
}
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 (this->pbase() == _M_str.data() ) {
ptrdiff_t __avail = _M_str.data() + _M_str.size() - this->pptr();
if (__avail > __n) {
_Traits::copy(this->pptr(), __s, __n);
this->pbump((int)__n);
return __n;
}
else {
_Traits::copy(this->pptr(), __s, __avail);
__nwritten += __avail;
__n -= __avail;
__s += __avail;
this->setp(_M_Buf, _M_Buf + __STATIC_CAST(int,_S_BufSiz));
}
}
// At this point we know we're appending.
if (_M_mode & ios_base::in) {
ptrdiff_t __get_offset = this->gptr() - this->eback();
_M_str.append(__s, __s + __n);
_CharT* __data_ptr = __CONST_CAST(_CharT*,_M_str.data());
size_t __data_size = _M_str.size();
this->setg(__data_ptr, __data_ptr + __get_offset, __data_ptr+__data_size);
this->setp(__data_ptr, __data_ptr + __data_size);
this->pbump((int)__data_size);
}
else {
_M_append_buffer();
_M_str.append(__s, __s + __n);
}
__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() == _M_str.data()) {
ptrdiff_t __avail = _M_str.data() + _M_str.size() - this->pptr();
if (__avail > __n) {
_Traits::assign(this->pptr(), __n, __c);
this->pbump((int)__n);
return __n;
}
else {
_Traits::assign(this->pptr(), __avail, __c);
__nwritten += __avail;
__n -= __avail;
this->setp(_M_Buf, _M_Buf + __STATIC_CAST(int,_S_BufSiz));
}
}
// At this point we know we're appending.
if (this->_M_mode & ios_base::in) {
ptrdiff_t __get_offset = this->gptr() - this->eback();
_M_str.append(__n, __c);
_CharT* __data_ptr = __CONST_CAST(_CharT*,_M_str.data());
size_t __data_size = _M_str.size();
this->setg(__data_ptr, __data_ptr + __get_offset, __data_ptr+__data_size);
this->setp(__data_ptr, __data_ptr + __data_size);
this->pbump((int)__data_size);
}
else {
_M_append_buffer();
_M_str.append(__n, __c);
}
__nwritten += __n;
}
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() == _M_str.data()) {
__do_put_area = true;
__offp = this->pptr() - this->pbase();
}
if (this->eback() == _M_str.data()) {
__do_get_area = true;
__offg = this->gptr() - this->eback();
}
if ((_M_mode & ios_base::out) && !(_M_mode & ios_base::in))
_M_append_buffer();
_M_str.reserve(__n);
_CharT* __data_ptr = __CONST_CAST(_CharT*,_M_str.data());
size_t __data_size = _M_str.size();
if (__do_get_area) {
this->setg(__data_ptr, __data_ptr + __offg, __data_ptr+__data_size);
}
if (__do_put_area) {
this->setp(__data_ptr, __data_ptr+__data_size);
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)
{
bool __in = false;
bool __out = false;
if ((__mode & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out) ) {
if (__dir == ios_base::beg || __dir == ios_base::end)
__in = __out = true;
}
else if (__mode & ios_base::in)
__in = true;
else if (__mode & ios_base::out)
__out = true;
if (!__in && !__out)
return pos_type(off_type(-1));
else if ((__in && (!(_M_mode & ios_base::in) || this->gptr() == 0)) ||
(__out && (!(_M_mode & ios_base::out) || this->pptr() == 0)))
return pos_type(off_type(-1));
if ((_M_mode & ios_base::out) && !(_M_mode & ios_base::in))
_M_append_buffer();
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 = __in ? this->gptr() - this->eback()
: this->pptr() - this->pbase();
break;
default:
return pos_type(off_type(-1));
}
__off += __newoff;
if (__in) {
ptrdiff_t __n = this->egptr() - this->eback();
if (__off < 0 || __off > __n)
return pos_type(off_type(-1));
else
this->setg(this->eback(), this->eback() + __off, this->eback() + __n);
}
if (__out) {
ptrdiff_t __n = this->epptr() - this->pbase();
if (__off < 0 || __off > __n)
return pos_type(off_type(-1));
else {
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)
{
bool __in = (__mode & ios_base::in) != 0;
bool __out = (__mode & ios_base::out) != 0;
if ((__in && (!(_M_mode & ios_base::in) || this->gptr() == 0)) ||
(__out && (!(_M_mode & ios_base::out) || this->pptr() == 0)))
return pos_type(off_type(-1));
const off_type __n = __pos - pos_type(off_type(0));
if ((_M_mode & ios_base::out) && !(_M_mode & ios_base::in))
_M_append_buffer();
if (__in) {
if (__n < 0 || __n > this->egptr() - this->eback())
return pos_type(off_type(-1));
this->setg(this->eback(), this->eback() + __n, this->egptr());
}
if (__out) {
if (__n < 0 || size_t(__n) > _M_str.size())
return pos_type(off_type(-1));
_CharT* __data_ptr = __CONST_CAST(_CharT*,_M_str.data());
size_t __data_size = _M_str.size();
this->setp(__data_ptr, __data_ptr+__data_size);
this->pbump((int)__n);
}
return __pos;
}
// This is declared as a const member function because it is
// called by basic_stringbuf<>::str(). Precondition: this is a
// write-only stringbuf. We can't use an output buffer for read-
// write stringbufs. Postcondition: pptr is reset to the beginning
// of the buffer.
template <class _CharT, class _Traits, class _Alloc>
void basic_stringbuf<_CharT, _Traits, _Alloc>::_M_append_buffer() const
{
// Do we have a buffer to append?
if (this->pbase() == this->_M_Buf && this->pptr() != this->_M_Buf) {
basic_stringbuf<_CharT, _Traits, _Alloc>* __this = __CONST_CAST(_Self*,this);
__this->_M_str.append((const _CharT*)this->pbase(), (const _CharT*)this->pptr());
__this->setp(__CONST_CAST(_CharT*,_M_Buf),
__CONST_CAST(_CharT*,_M_Buf + __STATIC_CAST(int,_S_BufSiz)));
}
// Have we run off the end of the string?
else if (this->pptr() == this->epptr()) {
basic_stringbuf<_CharT, _Traits, _Alloc>* __this = __CONST_CAST(_Self*,this);
__this->setp(__CONST_CAST(_CharT*,_M_Buf),
__CONST_CAST(_CharT*,_M_Buf + __STATIC_CAST(int,_S_BufSiz)));
}
}
//----------------------------------------------------------------------
// 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 /* EXPOSE */
#endif /* _STLP_SSTREAM_C */