/*
* 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.
*
*/
// Implementation of the classes in header <strstream>.
// WARNING: The classes defined in <strstream> are DEPRECATED. This
// header is defined in section D.7.1 of the C++ standard, and it
// MAY BE REMOVED in a future standard revision. You should use the
// header <sstream> instead.
#include "stlport_prefix.h"
#include <strstream>
#include <algorithm>
#include <limits>
_STLP_BEGIN_NAMESPACE
// strstreambuf constructor, destructor.
strstreambuf::strstreambuf(streamsize initial_capacity)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(true), _M_frozen(false), _M_constant(false) {
size_t n = (sizeof(streamsize) > sizeof(size_t)) ? __STATIC_CAST(size_t, (min)(__STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()),
(max)(initial_capacity, streamsize(16))))
: __STATIC_CAST(size_t, (max)(initial_capacity, streamsize(16)));
char* buf = _M_alloc(n);
if (buf) {
setp(buf, buf + n);
setg(buf, buf, buf);
}
}
strstreambuf::strstreambuf(__alloc_fn alloc_f, __free_fn free_f)
: _M_alloc_fun(alloc_f), _M_free_fun(free_f),
_M_dynamic(true), _M_frozen(false), _M_constant(false) {
size_t n = 16;
char* buf = _M_alloc(n);
if (buf) {
setp(buf, buf + n);
setg(buf, buf, buf);
}
}
strstreambuf::strstreambuf(char* get, streamsize n, char* put)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(false) {
_M_setup(get, put, n);
}
strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(false) {
_M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);
}
strstreambuf::strstreambuf(unsigned char* get, streamsize n,
unsigned char* put)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(false) {
_M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);
}
strstreambuf::strstreambuf(const char* get, streamsize n)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(true) {
_M_setup(__CONST_CAST(char*,get), 0, n);
}
strstreambuf::strstreambuf(const signed char* get, streamsize n)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(true) {
_M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(signed char*,get)), 0, n);
}
strstreambuf::strstreambuf(const unsigned char* get, streamsize n)
: _M_alloc_fun(0), _M_free_fun(0),
_M_dynamic(false), _M_frozen(false), _M_constant(true) {
_M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(unsigned char*,get)), 0, n);
}
strstreambuf::~strstreambuf() {
if (_M_dynamic && !_M_frozen)
_M_free(eback());
}
void strstreambuf::freeze(bool frozenflag) {
if (_M_dynamic)
_M_frozen = frozenflag;
}
char* strstreambuf::str() {
freeze(true);
return eback();
}
int strstreambuf::pcount() const {
return int(pptr() ? pptr() - pbase() : 0);
}
strstreambuf::int_type strstreambuf::overflow(int_type c) {
if (c == traits_type::eof())
return traits_type::not_eof(c);
// Try to expand the buffer.
if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) {
ptrdiff_t old_size = epptr() - pbase();
ptrdiff_t new_size = (max)(2 * old_size, ptrdiff_t(1));
char* buf = _M_alloc(new_size);
if (buf) {
memcpy(buf, pbase(), old_size);
char* old_buffer = pbase();
bool reposition_get = false;
ptrdiff_t old_get_offset;
if (gptr() != 0) {
reposition_get = true;
old_get_offset = gptr() - eback();
}
setp(buf, buf + new_size);
pbump((int)old_size);
if (reposition_get)
setg(buf, buf + old_get_offset, buf + (max)(old_get_offset, old_size));
_M_free(old_buffer);
}
}
if (pptr() != epptr()) {
*pptr() = traits_type::to_char_type(c);
pbump(1);
return c;
}
else
return traits_type::eof();
}
strstreambuf::int_type strstreambuf::pbackfail(int_type c) {
if (gptr() != eback()) {
if (c == traits_type::eof()) {
gbump(-1);
return traits_type::not_eof(c);
}
else if (c == gptr()[-1]) {
gbump(-1);
return c;
}
else if (!_M_constant) {
gbump(-1);
*gptr() = traits_type::to_char_type(c);
return c;
}
}
return traits_type::eof();
}
strstreambuf::int_type strstreambuf::underflow() {
if (gptr() == egptr() && pptr() && pptr() > egptr())
setg(eback(), gptr(), pptr());
if (gptr() != egptr())
return (unsigned char) *gptr();
else
return _Traits::eof();
}
basic_streambuf<char, char_traits<char> >*
strstreambuf::setbuf(char*, streamsize) {
return this;
}
strstreambuf::pos_type
strstreambuf::seekoff(off_type off,
ios_base::seekdir dir, ios_base::openmode mode) {
bool do_get = false;
bool do_put = false;
if ((mode & (ios_base::in | ios_base::out)) ==
(ios_base::in | ios_base::out) &&
(dir == ios_base::beg || dir == ios_base::end))
do_get = do_put = true;
else if (mode & ios_base::in)
do_get = true;
else if (mode & ios_base::out)
do_put = true;
// !gptr() is here because, according to D.7.1 paragraph 4, the seekable
// area is undefined if there is no get area.
if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr())
return pos_type(off_type(-1));
char* seeklow = eback();
char* seekhigh = epptr() ? epptr() : egptr();
off_type newoff;
switch(dir) {
case ios_base::beg:
newoff = 0;
break;
case ios_base::end:
newoff = seekhigh - seeklow;
break;
case ios_base::cur:
newoff = do_put ? pptr() - seeklow : gptr() - seeklow;
break;
default:
return pos_type(off_type(-1));
}
off += newoff;
if (off < 0 || off > seekhigh - seeklow)
return pos_type(off_type(-1));
if (do_put) {
if (seeklow + __STATIC_CAST(ptrdiff_t, off) < pbase()) {
setp(seeklow, epptr());
pbump((int)off);
}
else {
setp(pbase(), epptr());
pbump((int)(off - (pbase() - seeklow)));
}
}
if (do_get) {
if (off <= egptr() - seeklow)
setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), egptr());
else if (off <= pptr() - seeklow)
setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), pptr());
else
setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), epptr());
}
return pos_type(newoff);
}
strstreambuf::pos_type
strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) {
return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode);
}
char* strstreambuf::_M_alloc(size_t n) {
if (_M_alloc_fun)
return __STATIC_CAST(char*,_M_alloc_fun(n));
else
return new char[n];
}
void strstreambuf::_M_free(char* p) {
if (p) {
if (_M_free_fun)
_M_free_fun(p);
else
delete[] p;
}
}
void strstreambuf::_M_setup(char* get, char* put, streamsize n) {
if (get) {
size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX);
if (put) {
setg(get, get, get + N);
setp(put, put + N);
}
else {
setg(get, get, get + N);
}
}
}
//----------------------------------------------------------------------
// Class istrstream
istrstream::istrstream(char* s)
: basic_istream<char, char_traits<char> >(0), _M_buf(s, 0) {
this->init(&_M_buf);
}
istrstream::istrstream(const char* s)
: basic_istream<char, char_traits<char> >(0), _M_buf(s, 0) {
this->init(&_M_buf);
}
istrstream::istrstream(char* s, streamsize n)
: basic_istream<char, char_traits<char> >(0), _M_buf(s, n) {
this->init(&_M_buf);
}
istrstream::istrstream(const char* s, streamsize n)
: basic_istream<char, char_traits<char> >(0), _M_buf(s, n) {
this->init(&_M_buf);
}
istrstream::~istrstream() {}
strstreambuf* istrstream::rdbuf() const {
return __CONST_CAST(strstreambuf*,&_M_buf);
}
char* istrstream::str() { return _M_buf.str(); }
//----------------------------------------------------------------------
// Class ostrstream
ostrstream::ostrstream()
: basic_ostream<char, char_traits<char> >(0), _M_buf() {
basic_ios<char, char_traits<char> >::init(&_M_buf);
}
ostrstream::ostrstream(char* s, int n, ios_base::openmode mode)
: basic_ostream<char, char_traits<char> >(0),
_M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) {
basic_ios<char, char_traits<char> >::init(&_M_buf);
}
ostrstream::~ostrstream() {}
strstreambuf* ostrstream::rdbuf() const {
return __CONST_CAST(strstreambuf*,&_M_buf);
}
void ostrstream::freeze(bool freezeflag) {
_M_buf.freeze(freezeflag);
}
char* ostrstream::str() {
return _M_buf.str();
}
int ostrstream::pcount() const {
return _M_buf.pcount();
}
//----------------------------------------------------------------------
// Class strstream
strstream::strstream()
: basic_iostream<char, char_traits<char> >(0), _M_buf() {
basic_ios<char, char_traits<char> >::init(&_M_buf);
}
strstream::strstream(char* s, int n, ios_base::openmode mode)
: basic_iostream<char, char_traits<char> >(0),
_M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) {
basic_ios<char, char_traits<char> >::init(&_M_buf);
}
strstream::~strstream() {}
strstreambuf* strstream::rdbuf() const {
return __CONST_CAST(strstreambuf*,&_M_buf);
}
void strstream::freeze(bool freezeflag) {
_M_buf.freeze(freezeflag);
}
int strstream::pcount() const {
return _M_buf.pcount();
}
char* strstream::str() {
return _M_buf.str();
}
_STLP_END_NAMESPACE
// Local Variables:
// mode:C++
// End: