| // Input streams -*- C++ -*- | |
| // Copyright (C) 2004-2026 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 conversion to int_type changes the value then __delim does not | |
| // correspond to a value of type char_type, and so will never match | |
| // a character extracted from the input sequence. Just use ignore(n). | |
| const int_type chk_delim = traits_type::to_int_type(__delim); | |
| const bool matchable = traits_type::eq_int_type(chk_delim, __delim); | |
| if (__builtin_expect(!matchable, 0)) | |
| return ignore(__n); | |
| // Now we know that __delim is a valid char_type value, so it's safe | |
| // for the code below to use traits_type::find to search for it. | |
| } | |
| _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 |