| //===------------------------ 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 |
