| // Input streams -*- C++ -*- |
| |
| // Copyright (C) 2004-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| // |
| // ISO C++ 14882: 27.6.1 Input streams |
| // |
| |
| #include <istream> |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| template<> |
| basic_istream<char>& |
| basic_istream<char>:: |
| getline(char_type* __s, streamsize __n, char_type __delim) |
| { |
| _M_gcount = 0; |
| ios_base::iostate __err = ios_base::goodbit; |
| sentry __cerb(*this, true); |
| if (__cerb) |
| { |
| __try |
| { |
| const int_type __idelim = traits_type::to_int_type(__delim); |
| const int_type __eof = traits_type::eof(); |
| __streambuf_type* __sb = this->rdbuf(); |
| int_type __c = __sb->sgetc(); |
| |
| while (_M_gcount + 1 < __n |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __idelim)) |
| { |
| streamsize __size = std::min(streamsize(__sb->egptr() |
| - __sb->gptr()), |
| streamsize(__n - _M_gcount |
| - 1)); |
| if (__size > 1) |
| { |
| const char_type* __p = traits_type::find(__sb->gptr(), |
| __size, |
| __delim); |
| if (__p) |
| __size = __p - __sb->gptr(); |
| traits_type::copy(__s, __sb->gptr(), __size); |
| __s += __size; |
| __sb->__safe_gbump(__size); |
| _M_gcount += __size; |
| __c = __sb->sgetc(); |
| } |
| else |
| { |
| *__s++ = traits_type::to_char_type(__c); |
| ++_M_gcount; |
| __c = __sb->snextc(); |
| } |
| } |
| |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else if (traits_type::eq_int_type(__c, __idelim)) |
| { |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| else |
| __err |= ios_base::failbit; |
| } |
| __catch(__cxxabiv1::__forced_unwind&) |
| { |
| this->_M_setstate(ios_base::badbit); |
| __throw_exception_again; |
| } |
| __catch(...) |
| { this->_M_setstate(ios_base::badbit); } |
| } |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 243. get and getline when sentry reports failure. |
| if (__n > 0) |
| *__s = char_type(); |
| if (!_M_gcount) |
| __err |= ios_base::failbit; |
| if (__err) |
| this->setstate(__err); |
| return *this; |
| } |
| |
| template<> |
| basic_istream<char>& |
| basic_istream<char>:: |
| ignore(streamsize __n, int_type __delim) |
| { |
| if (traits_type::eq_int_type(__delim, traits_type::eof())) |
| return ignore(__n); |
| |
| _M_gcount = 0; |
| sentry __cerb(*this, true); |
| if (__n > 0 && __cerb) |
| { |
| ios_base::iostate __err = ios_base::goodbit; |
| __try |
| { |
| const char_type __cdelim = traits_type::to_char_type(__delim); |
| const int_type __eof = traits_type::eof(); |
| __streambuf_type* __sb = this->rdbuf(); |
| int_type __c = __sb->sgetc(); |
| |
| bool __large_ignore = false; |
| while (true) |
| { |
| while (_M_gcount < __n |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __delim)) |
| { |
| streamsize __size = std::min(streamsize(__sb->egptr() |
| - __sb->gptr()), |
| streamsize(__n - _M_gcount)); |
| if (__size > 1) |
| { |
| const char_type* __p = traits_type::find(__sb->gptr(), |
| __size, |
| __cdelim); |
| if (__p) |
| __size = __p - __sb->gptr(); |
| __sb->__safe_gbump(__size); |
| _M_gcount += __size; |
| __c = __sb->sgetc(); |
| } |
| else |
| { |
| ++_M_gcount; |
| __c = __sb->snextc(); |
| } |
| } |
| if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __delim)) |
| { |
| _M_gcount = |
| __gnu_cxx::__numeric_traits<streamsize>::__min; |
| __large_ignore = true; |
| } |
| else |
| break; |
| } |
| |
| if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) |
| { |
| if (__large_ignore) |
| _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; |
| |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else |
| { |
| if (_M_gcount != __n) |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| } |
| else if (_M_gcount < __n) // implies __c == __delim or EOF |
| { |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else |
| { |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| } |
| } |
| __catch(__cxxabiv1::__forced_unwind&) |
| { |
| this->_M_setstate(ios_base::badbit); |
| __throw_exception_again; |
| } |
| __catch(...) |
| { this->_M_setstate(ios_base::badbit); } |
| if (__err) |
| this->setstate(__err); |
| } |
| return *this; |
| } |
| |
| void |
| __istream_extract(istream& __in, char* __s, streamsize __num) |
| { |
| typedef basic_istream<char> __istream_type; |
| typedef __istream_type::int_type __int_type; |
| typedef __istream_type::char_type __char_type; |
| typedef __istream_type::traits_type __traits_type; |
| typedef __istream_type::__streambuf_type __streambuf_type; |
| typedef __istream_type::__ctype_type __ctype_type; |
| |
| streamsize __extracted = 0; |
| ios_base::iostate __err = ios_base::goodbit; |
| __istream_type::sentry __cerb(__in, false); |
| if (__cerb) |
| { |
| __try |
| { |
| // Figure out how many characters to extract. |
| streamsize __width = __in.width(); |
| if (0 < __width && __width < __num) |
| __num = __width; |
| |
| const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc()); |
| |
| const __int_type __eof = __traits_type::eof(); |
| __streambuf_type* __sb = __in.rdbuf(); |
| __int_type __c = __sb->sgetc(); |
| |
| while (__extracted < __num - 1 |
| && !__traits_type::eq_int_type(__c, __eof) |
| && !__ct.is(ctype_base::space, |
| __traits_type::to_char_type(__c))) |
| { |
| streamsize __size = std::min(streamsize(__sb->egptr() |
| - __sb->gptr()), |
| streamsize(__num - __extracted |
| - 1)); |
| if (__size > 1) |
| { |
| __size = (__ct.scan_is(ctype_base::space, |
| __sb->gptr() + 1, |
| __sb->gptr() + __size) |
| - __sb->gptr()); |
| __traits_type::copy(__s, __sb->gptr(), __size); |
| __s += __size; |
| __sb->__safe_gbump(__size); |
| __extracted += __size; |
| __c = __sb->sgetc(); |
| } |
| else |
| { |
| *__s++ = __traits_type::to_char_type(__c); |
| ++__extracted; |
| __c = __sb->snextc(); |
| } |
| } |
| |
| if (__extracted < __num - 1 |
| && __traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 68. Extractors for char* should store null at end |
| *__s = __char_type(); |
| __in.width(0); |
| } |
| __catch(__cxxabiv1::__forced_unwind&) |
| { |
| __in._M_setstate(ios_base::badbit); |
| __throw_exception_again; |
| } |
| __catch(...) |
| { __in._M_setstate(ios_base::badbit); } |
| } |
| if (!__extracted) |
| __err |= ios_base::failbit; |
| if (__err) |
| __in.setstate(__err); |
| } |
| |
| #ifdef _GLIBCXX_USE_WCHAR_T |
| template<> |
| basic_istream<wchar_t>& |
| basic_istream<wchar_t>:: |
| getline(char_type* __s, streamsize __n, char_type __delim) |
| { |
| _M_gcount = 0; |
| ios_base::iostate __err = ios_base::goodbit; |
| sentry __cerb(*this, true); |
| if (__cerb) |
| { |
| __try |
| { |
| const int_type __idelim = traits_type::to_int_type(__delim); |
| const int_type __eof = traits_type::eof(); |
| __streambuf_type* __sb = this->rdbuf(); |
| int_type __c = __sb->sgetc(); |
| |
| while (_M_gcount + 1 < __n |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __idelim)) |
| { |
| streamsize __size = std::min(streamsize(__sb->egptr() |
| - __sb->gptr()), |
| streamsize(__n - _M_gcount |
| - 1)); |
| if (__size > 1) |
| { |
| const char_type* __p = traits_type::find(__sb->gptr(), |
| __size, |
| __delim); |
| if (__p) |
| __size = __p - __sb->gptr(); |
| traits_type::copy(__s, __sb->gptr(), __size); |
| __s += __size; |
| __sb->__safe_gbump(__size); |
| _M_gcount += __size; |
| __c = __sb->sgetc(); |
| } |
| else |
| { |
| *__s++ = traits_type::to_char_type(__c); |
| ++_M_gcount; |
| __c = __sb->snextc(); |
| } |
| } |
| |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else if (traits_type::eq_int_type(__c, __idelim)) |
| { |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| else |
| __err |= ios_base::failbit; |
| } |
| __catch(__cxxabiv1::__forced_unwind&) |
| { |
| this->_M_setstate(ios_base::badbit); |
| __throw_exception_again; |
| } |
| __catch(...) |
| { this->_M_setstate(ios_base::badbit); } |
| } |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 243. get and getline when sentry reports failure. |
| if (__n > 0) |
| *__s = char_type(); |
| if (!_M_gcount) |
| __err |= ios_base::failbit; |
| if (__err) |
| this->setstate(__err); |
| return *this; |
| } |
| |
| template<> |
| basic_istream<wchar_t>& |
| basic_istream<wchar_t>:: |
| ignore(streamsize __n, int_type __delim) |
| { |
| if (traits_type::eq_int_type(__delim, traits_type::eof())) |
| return ignore(__n); |
| |
| _M_gcount = 0; |
| sentry __cerb(*this, true); |
| if (__n > 0 && __cerb) |
| { |
| ios_base::iostate __err = ios_base::goodbit; |
| __try |
| { |
| const char_type __cdelim = traits_type::to_char_type(__delim); |
| const int_type __eof = traits_type::eof(); |
| __streambuf_type* __sb = this->rdbuf(); |
| int_type __c = __sb->sgetc(); |
| |
| bool __large_ignore = false; |
| while (true) |
| { |
| while (_M_gcount < __n |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __delim)) |
| { |
| streamsize __size = std::min(streamsize(__sb->egptr() |
| - __sb->gptr()), |
| streamsize(__n - _M_gcount)); |
| if (__size > 1) |
| { |
| const char_type* __p = traits_type::find(__sb->gptr(), |
| __size, |
| __cdelim); |
| if (__p) |
| __size = __p - __sb->gptr(); |
| __sb->__safe_gbump(__size); |
| _M_gcount += __size; |
| __c = __sb->sgetc(); |
| } |
| else |
| { |
| ++_M_gcount; |
| __c = __sb->snextc(); |
| } |
| } |
| if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max |
| && !traits_type::eq_int_type(__c, __eof) |
| && !traits_type::eq_int_type(__c, __delim)) |
| { |
| _M_gcount = |
| __gnu_cxx::__numeric_traits<streamsize>::__min; |
| __large_ignore = true; |
| } |
| else |
| break; |
| } |
| |
| if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) |
| { |
| if (__large_ignore) |
| _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; |
| |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else |
| { |
| if (_M_gcount != __n) |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| } |
| else if (_M_gcount < __n) // implies __c == __delim or EOF |
| { |
| if (traits_type::eq_int_type(__c, __eof)) |
| __err |= ios_base::eofbit; |
| else |
| { |
| ++_M_gcount; |
| __sb->sbumpc(); |
| } |
| } |
| } |
| __catch(__cxxabiv1::__forced_unwind&) |
| { |
| this->_M_setstate(ios_base::badbit); |
| __throw_exception_again; |
| } |
| __catch(...) |
| { this->_M_setstate(ios_base::badbit); } |
| if (__err) |
| this->setstate(__err); |
| } |
| return *this; |
| } |
| #endif |
| |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
