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|
//===------------------------ strstream.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "strstream"
#include "algorithm"
#include "climits"
#include "cstring"
#include "cstdlib"
#include "__debug"
#include "__undef_macros"
_LIBCPP_BEGIN_NAMESPACE_STD
strstreambuf::strstreambuf(streamsize __alsize)
: __strmode_(__dynamic),
__alsize_(__alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
}
strstreambuf::strstreambuf(void* (*__palloc)(size_t), void (*__pfree)(void*))
: __strmode_(__dynamic),
__alsize_(__default_alsize),
__palloc_(__palloc),
__pfree_(__pfree)
{
}
void
strstreambuf::__init(char* __gnext, streamsize __n, char* __pbeg)
{
if (__n == 0)
__n = static_cast<streamsize>(strlen(__gnext));
else if (__n < 0)
__n = INT_MAX;
if (__pbeg == nullptr)
setg(__gnext, __gnext, __gnext + __n);
else
{
setg(__gnext, __gnext, __pbeg);
setp(__pbeg, __pbeg + __n);
}
}
strstreambuf::strstreambuf(char* __gnext, streamsize __n, char* __pbeg)
: __strmode_(),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(__gnext, __n, __pbeg);
}
strstreambuf::strstreambuf(const char* __gnext, streamsize __n)
: __strmode_(__constant),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(const_cast<char *>(__gnext), __n, nullptr);
}
strstreambuf::strstreambuf(signed char* __gnext, streamsize __n, signed char* __pbeg)
: __strmode_(),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
}
strstreambuf::strstreambuf(const signed char* __gnext, streamsize __n)
: __strmode_(__constant),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
}
strstreambuf::strstreambuf(unsigned char* __gnext, streamsize __n, unsigned char* __pbeg)
: __strmode_(),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
}
strstreambuf::strstreambuf(const unsigned char* __gnext, streamsize __n)
: __strmode_(__constant),
__alsize_(__default_alsize),
__palloc_(nullptr),
__pfree_(nullptr)
{
__init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
}
strstreambuf::~strstreambuf()
{
if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0)
{
if (__pfree_)
__pfree_(eback());
else
delete [] eback();
}
}
void
strstreambuf::swap(strstreambuf& __rhs)
{
streambuf::swap(__rhs);
_VSTD::swap(__strmode_, __rhs.__strmode_);
_VSTD::swap(__alsize_, __rhs.__alsize_);
_VSTD::swap(__palloc_, __rhs.__palloc_);
_VSTD::swap(__pfree_, __rhs.__pfree_);
}
void
strstreambuf::freeze(bool __freezefl)
{
if (__strmode_ & __dynamic)
{
if (__freezefl)
__strmode_ |= __frozen;
else
__strmode_ &= ~__frozen;
}
}
char*
strstreambuf::str()
{
if (__strmode_ & __dynamic)
__strmode_ |= __frozen;
return eback();
}
int
strstreambuf::pcount() const
{
return static_cast<int>(pptr() - pbase());
}
strstreambuf::int_type
strstreambuf::overflow(int_type __c)
{
if (__c == EOF)
return int_type(0);
if (pptr() == epptr())
{
if ((__strmode_ & __dynamic) == 0 || (__strmode_ & __frozen) != 0)
return int_type(EOF);
size_t old_size = static_cast<size_t> ((epptr() ? epptr() : egptr()) - eback());
size_t new_size = max<size_t>(static_cast<size_t>(__alsize_), 2*old_size);
if (new_size == 0)
new_size = __default_alsize;
char* buf = nullptr;
if (__palloc_)
buf = static_cast<char*>(__palloc_(new_size));
else
buf = new char[new_size];
if (buf == nullptr)
return int_type(EOF);
if (old_size != 0) {
_LIBCPP_ASSERT(eback(), "overflow copying from NULL");
memcpy(buf, eback(), static_cast<size_t>(old_size));
}
ptrdiff_t ninp = gptr() - eback();
ptrdiff_t einp = egptr() - eback();
ptrdiff_t nout = pptr() - pbase();
if (__strmode_ & __allocated)
{
if (__pfree_)
__pfree_(eback());
else
delete [] eback();
}
setg(buf, buf + ninp, buf + einp);
setp(buf + einp, buf + new_size);
__pbump(nout);
__strmode_ |= __allocated;
}
*pptr() = static_cast<char>(__c);
pbump(1);
return int_type(static_cast<unsigned char>(__c));
}
strstreambuf::int_type
strstreambuf::pbackfail(int_type __c)
{
if (eback() == gptr())
return EOF;
if (__c == EOF)
{
gbump(-1);
return int_type(0);
}
if (__strmode_ & __constant)
{
if (gptr()[-1] == static_cast<char>(__c))
{
gbump(-1);
return __c;
}
return EOF;
}
gbump(-1);
*gptr() = static_cast<char>(__c);
return __c;
}
strstreambuf::int_type
strstreambuf::underflow()
{
if (gptr() == egptr())
{
if (egptr() >= pptr())
return EOF;
setg(eback(), gptr(), pptr());
}
return int_type(static_cast<unsigned char>(*gptr()));
}
strstreambuf::pos_type
strstreambuf::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __which)
{
off_type __p(-1);
bool pos_in = (__which & ios::in) != 0;
bool pos_out = (__which & ios::out) != 0;
bool legal = false;
switch (__way)
{
case ios::beg:
case ios::end:
if (pos_in || pos_out)
legal = true;
break;
case ios::cur:
if (pos_in != pos_out)
legal = true;
break;
}
if (pos_in && gptr() == nullptr)
legal = false;
if (pos_out && pptr() == nullptr)
legal = false;
if (legal)
{
off_type newoff;
char* seekhigh = epptr() ? epptr() : egptr();
switch (__way)
{
case ios::beg:
newoff = 0;
break;
case ios::cur:
newoff = (pos_in ? gptr() : pptr()) - eback();
break;
case ios::end:
newoff = seekhigh - eback();
break;
default:
_LIBCPP_UNREACHABLE();
}
newoff += __off;
if (0 <= newoff && newoff <= seekhigh - eback())
{
char* newpos = eback() + newoff;
if (pos_in)
setg(eback(), newpos, _VSTD::max(newpos, egptr()));
if (pos_out)
{
// min(pbase, newpos), newpos, epptr()
__off = epptr() - newpos;
setp(min(pbase(), newpos), epptr());
__pbump((epptr() - pbase()) - __off);
}
__p = newoff;
}
}
return pos_type(__p);
}
strstreambuf::pos_type
strstreambuf::seekpos(pos_type __sp, ios_base::openmode __which)
{
off_type __p(-1);
bool pos_in = (__which & ios::in) != 0;
bool pos_out = (__which & ios::out) != 0;
if (pos_in || pos_out)
{
if (!((pos_in && gptr() == nullptr) || (pos_out && pptr() == nullptr)))
{
off_type newoff = __sp;
char* seekhigh = epptr() ? epptr() : egptr();
if (0 <= newoff && newoff <= seekhigh - eback())
{
char* newpos = eback() + newoff;
if (pos_in)
setg(eback(), newpos, _VSTD::max(newpos, egptr()));
if (pos_out)
{
// min(pbase, newpos), newpos, epptr()
off_type temp = epptr() - newpos;
setp(min(pbase(), newpos), epptr());
__pbump((epptr() - pbase()) - temp);
}
__p = newoff;
}
}
}
return pos_type(__p);
}
istrstream::~istrstream()
{
}
ostrstream::~ostrstream()
{
}
strstream::~strstream()
{
}
_LIBCPP_END_NAMESPACE_STD
|
