istream

/*	Copyright (C) 2004 Garrett A. Kajmowicz

	This file is part of the uClibc 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 2, 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.

	You should have received a copy of the GNU General Public License along
	with this library; see the file COPYING.  If not, write to the Free
	Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	USA.
*/

#include <ios>
#include <cctype>
#include <streambuf>
#include <istream_helpers>
#include <ostream>

#ifndef __STD_HEADER_ISTREAM
#define __STD_HEADER_ISTREAM 1

#pragma GCC visibility push(default)

namespace std{

	typedef basic_istream<char> istream;

#ifdef __UCLIBCXX_HAS_WCHAR__
	typedef basic_istream<wchar_t> wistream;
#endif

	template <class charT, class traits> basic_istream<charT,traits>& ws(basic_istream<charT,traits>& is);

	template <class charT, class traits> class _UCXXEXPORT basic_istream :
		virtual public basic_ios<charT,traits>
	{
	public:
	
		typedef charT                     char_type;
		typedef typename traits::int_type int_type;
		typedef typename traits::pos_type pos_type;
		typedef typename traits::off_type off_type;
		typedef basic_streambuf<charT,traits>  streambuf_type;
		typedef traits                    traits_type;
    	
		explicit basic_istream(basic_streambuf<charT,traits>* sb)
			: basic_ios<charT, traits>(sb), count_last_ufmt_input(0)
		{
			basic_ios<charT, traits>::init(sb);
		}
		virtual ~basic_istream() { }
	
		class sentry;
	
		basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>& (*pf)(basic_istream<charT,traits>&));
		basic_istream<charT,traits>& operator>>(basic_ios<charT,traits>& (*pf)(basic_ios<charT,traits>&));
		basic_istream<charT,traits>& operator>>(ios_base& (*pf)(ios_base&));
		basic_istream<charT,traits>& operator>>(bool& n);
		basic_istream<charT,traits>& operator>>(short& n);
		basic_istream<charT,traits>& operator>>(unsigned short& n);
		basic_istream<charT,traits>& operator>>(int& n);
		basic_istream<charT,traits>& operator>>(unsigned int& n);
		basic_istream<charT,traits>& operator>>(long& n);
		basic_istream<charT,traits>& operator>>(unsigned long& n);
		basic_istream<charT,traits>& operator>>(void*& p);
		basic_istream<charT,traits>& operator>>(basic_streambuf<char_type,traits>* sb);

#ifdef __UCLIBCXX_HAS_FLOATS__
		basic_istream<charT,traits>& operator>>(float& f);
		basic_istream<charT,traits>& operator>>(double& f);
		basic_istream<charT,traits>& operator>>(long double& f);
#endif
	
		_UCXXEXPORT streamsize gcount() const{
			return count_last_ufmt_input;
		}
		
		_UCXXEXPORT int_type get();		//below
		_UCXXEXPORT basic_istream<charT,traits>& get(char_type& c); 	//Below
		
		_UCXXEXPORT basic_istream<charT,traits>& get(char_type* s, streamsize n){
			return get(s, n, basic_ios<charT,traits>::widen('\n'));
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& get(char_type* s, streamsize n, char_type delim){
			sentry(*this, true);
			streamsize i = 0;
			int_type c;
			for(i=0;i<n-1;++i){
				c = basic_ios<charT, traits>::mstreambuf->sgetc();
				basic_ios<charT, traits>::mstreambuf->sbumpc();
				if(c == traits::eof() ){
					if(i==0){
						basic_ios<charT,traits>::setstate(ios_base::failbit);
					}else{
						basic_ios<charT,traits>::setstate(ios_base::eofbit);
					}
					break;
				}
				if(c == delim){
					if(i==0){
						basic_ios<charT,traits>::setstate(ios_base::failbit);
					}
					basic_ios<charT, traits>::mstreambuf->sputbackc(c);
					break;
				}
				s[i] = c;
			}
			s[i] = traits::eos();
			count_last_ufmt_input = i;
			return *this;
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& get(basic_streambuf<char_type,traits>& sb){
			return get(sb, basic_ios<charT,traits>::widen('\n'));
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& get(basic_streambuf<char_type,traits>& sb, char_type delim){
			sentry(*this, true);
			streamsize i = 0;
			int_type c;
			while(1){		//We will exit internally based upon error conditions
				c = basic_ios<charT, traits>::mstreambuf->sgetc();
				if(c == traits::eof()){
					if(i==0){
						basic_ios<charT,traits>::setstate(ios_base::failbit);
					}else{
						basic_ios<charT,traits>::setstate(ios_base::eofbit);
					}
					count_last_ufmt_input = i;
					return *this;
				}
				if(c == delim){
					if(i==0){
						basic_ios<charT,traits>::setstate(ios_base::failbit);
					}
					count_last_ufmt_input = i;
					return *this;
				}
				if(sb.sputc(c) != c){	//Error doing output
					count_last_ufmt_input = i;
					return *this;
				}
				++i;
				basic_ios<charT, traits>::mstreambuf->sbumpc();
			}		
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& getline(char_type* s, streamsize n){
			return getline(s, n, basic_ios<charT,traits>::widen('\n'));
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& getline(char_type* s, streamsize n, char_type delim){
			sentry(*this, true);
			streamsize i = 0;
			int_type c;
			for(i=0;i<n-1;++i){
				c = basic_ios<charT, traits>::mstreambuf->sgetc();
				if(c == traits::eof() ){
					if( basic_ios<charT,traits>::eof() ){
						basic_ios<charT,traits>::setstate(ios_base::failbit);
					}else{
						basic_ios<charT,traits>::setstate(ios_base::eofbit);
					}
					count_last_ufmt_input = i;
					s[i] = traits::eos();
					return *this;
				}
				if(basic_ios<charT, traits>::mstreambuf->sbumpc()==traits::eof() ){
					basic_ios<charT,traits>::setstate(ios_base::eofbit);
				}
				if(c == delim){
					count_last_ufmt_input = i+1;
					s[i] = traits::eos();
					return *this;
				}
				s[i] = c;
			}
			s[n-1] = traits::eos();
			return *this;
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& ignore (streamsize n = 1, int_type delim = traits::eof()){
			sentry(*this, true);
			streamsize i;
			int_type c;
			for(i=0;i<n;++i){
				c = basic_ios<charT, traits>::mstreambuf->sgetc();
				if(c == traits::eof()){
					basic_ios<charT,traits>::setstate(ios_base::eofbit);
					return *this;
				}
				basic_ios<charT, traits>::mstreambuf->sbumpc();
				if(c == delim){
					return *this;
				}
			}
			return *this;
		}
		
		_UCXXEXPORT int_type peek(){
			if(basic_ios<charT,traits>::good() == false){
				return traits::eof();
			}else{
				int_type c = basic_ios<charT, traits>::mstreambuf->sgetc();
				if(c == traits::eof()){
					basic_ios<charT,traits>::setstate(ios_base::eofbit);
				}
				return basic_ios<charT, traits>::mstreambuf->sgetc();
			}
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& read (char_type* s, streamsize n){
			sentry(*this, true);
			streamsize i;
			int_type c;
			for(i=0;i<n;++i){
				c = basic_ios<charT, traits>::mstreambuf->sgetc();

				if(c == traits::eof()){
					basic_ios<charT,traits>::setstate(ios_base::failbit);
					basic_ios<charT,traits>::setstate(ios_base::eofbit);
					count_last_ufmt_input = i;
					return *this;
				}
				basic_ios<charT, traits>::mstreambuf->sbumpc();
				s[i] = c;
			}
			count_last_ufmt_input = n;
			return *this;
		}
		
		_UCXXEXPORT streamsize readsome(char_type* s, streamsize n){
			sentry(*this, true);
			if(!basic_ios<charT,traits>::good()){
				count_last_ufmt_input = 0;
				basic_ios<charT,traits>::setstate(ios_base::failbit);
				return 0;
			}
			
			if( basic_ios<charT, traits>::mstreambuf->in_avail()  ==  -1){
				count_last_ufmt_input=0;
				basic_ios<charT,traits>::setstate(ios_base::eofbit);
				return 0;
			}
			
			if(n > basic_ios<charT, traits>::mstreambuf->in_avail() ){
				n = basic_ios<charT, traits>::mstreambuf->in_avail();
			}
			
			streamsize i;
			int_type c;
			
			for(i=0;i<n;++i){
				c = basic_ios<charT, traits>::mstreambuf->sgetc();
				basic_ios<charT, traits>::mstreambuf->sbumpc();
				s[i] = c;
			}
			count_last_ufmt_input = n;
			return n;
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& putback(char_type c){
			sentry(*this, true);
			if(!basic_ios<charT,traits>::good()){
				basic_ios<charT,traits>::setstate(ios_base::failbit);
				return *this;
			}
			if(basic_ios<charT, traits>::mstreambuf == 0){
				basic_ios<charT,traits>::setstate(ios_base::badbit);
				return *this;
			}
			if(basic_ios<charT, traits>::mstreambuf->sputbackc(c) == traits::eof()){
				basic_ios<charT,traits>::setstate(ios_base::badbit);
				return *this;
			}
			return *this;
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& unget(){
			sentry(*this, true);
			if(!basic_ios<charT,traits>::good()){
				basic_ios<charT,traits>::setstate(ios_base::failbit);
				return *this;
			}
			if(basic_ios<charT, traits>::mstreambuf == 0){
				basic_ios<charT,traits>::setstate(ios_base::failbit);
				return *this;
			}
			if(basic_ios<charT, traits>::mstreambuf->sungetc() == traits::eof()){
				basic_ios<charT,traits>::setstate(ios_base::failbit);
			}
			return *this;
		}
		
		_UCXXEXPORT int sync(){
			sentry(*this, true);
			if(basic_ios<charT, traits>::mstreambuf == 0){
				return -1;
			}
			if(basic_ios<charT, traits>::mstreambuf->pubsync() == -1){
				basic_ios<charT,traits>::setstate(ios_base::badbit);
				return traits::eof();
			}
			return 0;
		}
	
		_UCXXEXPORT pos_type tellg(){
			if(basic_ios<charT,traits>::fail() !=false){
				return pos_type(-1);
			}
			return basic_ios<charT, traits>::mstreambuf->pubseekoff(0, ios_base::cur, ios_base::in);
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& seekg(pos_type pos){
			 if(basic_ios<charT,traits>::fail() !=true){
			 	basic_ios<charT, traits>::mstreambuf->pubseekpos(pos);
			 }
			return *this;		
		}
		
		_UCXXEXPORT basic_istream<charT,traits>& seekg(off_type off, ios_base::seekdir dir){
			if(basic_ios<charT,traits>::fail() !=true){
				basic_ios<charT, traits>::mstreambuf->pubseekoff(off, dir);
			}
			return *this;
		}
		
	protected:
		_UCXXEXPORT basic_istream(const basic_istream<charT,traits> &): basic_ios<charT, traits>() { }
		_UCXXEXPORT basic_istream<charT,traits> & operator=(const basic_istream<charT,traits> &){ return *this; }
		streamsize count_last_ufmt_input;

	};
	
	template <class charT,class traits = char_traits<charT> > class _UCXXEXPORT basic_istream<charT,traits>::sentry {
		bool ok;
	public:
		explicit _UCXXEXPORT sentry(basic_istream<charT,traits>& os, bool noskipws = false){
			if(os.good() !=0){		//Prepare for output
			}

			//Flush any tied buffer
			if(os.tie() != 0){
				os.tie()->flush();
			}
			if(!noskipws){
				__skipws(os);
			}

			ok = true;
		}
		_UCXXEXPORT ~sentry() { }
		_UCXXEXPORT operator bool() {
			return ok;
		}
	};
	
	//Template implementations of basic_istream functions which may be partially specialized
	//For code reduction

	template <class charT, class traits>
	_UCXXEXPORT typename basic_istream<charT,traits>::int_type basic_istream<charT,traits>::get(){
		sentry(*this, true);
		int_type retval = basic_ios<charT, traits>::mstreambuf->sgetc();
		if(retval == traits::eof()){
			count_last_ufmt_input = 0;
			basic_ios<charT,traits>::setstate(ios_base::eofbit);
		}else{
			count_last_ufmt_input = 1;
			basic_ios<charT, traits>::mstreambuf->sbumpc();
		}
		return retval;
	}

	template <class charT, class traits>
	_UCXXEXPORT basic_istream<charT,traits>& basic_istream<charT,traits>::get(char_type& c){
		sentry(*this, true);
		int_type retval = basic_ios<charT, traits>::mstreambuf->sgetc();
		if(retval == traits::eof()){
			count_last_ufmt_input = 0;
			basic_ios<charT,traits>::setstate(ios_base::eofbit);
			basic_ios<charT,traits>::setstate(ios_base::failbit);
		}else{
			count_last_ufmt_input = 1;
			c = traits::to_char_type(retval);
			basic_ios<charT, traits>::mstreambuf->sbumpc();
		}
		return *this;
	}
		

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(bool& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, bool>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(short& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, short>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(unsigned short& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, unsigned short>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& basic_istream<charT,traits>::operator>>(int& n){
		sentry(*this);
		__istream_readin<traits, charT, int>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& basic_istream<charT,traits>::operator>>(unsigned int& n){
		sentry(*this);
		__istream_readin<traits, charT, unsigned int>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& basic_istream<charT,traits>::operator>>(long int& n){
		sentry(*this);
		__istream_readin<traits, charT, long int>::readin(*this, n);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(unsigned long int& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, unsigned long int>::readin(*this, n);
		return *this;
	}

#ifdef __UCLIBCXX_HAS_FLOATS__
	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(float& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, float>::readin(*this, n);
		return *this;
	}
	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(double& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, double>::readin(*this, n);
		return *this;
	}
	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(long double& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, long double>::readin(*this, n);
		return *this;
	}
#endif
	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(void *& n)
	{
		sentry(*this);
		__istream_readin<traits, charT, void*>::readin(*this, n);
		return *this;
	}

	template<class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>&
		operator>>(basic_istream<charT,traits>& is, charT& c)
	{
		typename basic_istream<charT,traits>::sentry s(is);
		is.get(c);
		return is;
	}

	template<class traits> _UCXXEXPORT basic_istream<char,traits>&
		operator>>(basic_istream<char,traits>& is, unsigned char& c)
	{
		typename basic_istream<char,traits>::sentry s(is);
		char b;
		is.get(b);
		c = b;
		return is;
	}
	template<class traits> _UCXXEXPORT basic_istream<char,traits>&
		operator>>(basic_istream<char,traits>& is, signed char& c)
	{
		typename basic_istream<char,traits>::sentry s(is);
		is.get(c);
		return is;
	}

	template<class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>&
		operator>>(basic_istream<charT,traits>& is, charT* c)
	{
		typename basic_istream<charT,traits>::sentry s(is);
		int n = is.width();
		if(n == 0){
			n = __STRING_MAX_UNITS;
		}
		is.get(c, n);
		return is;

	}
	template<class traits> _UCXXEXPORT basic_istream<char,traits>&
		operator>>(basic_istream<char,traits>& is, unsigned char* c)
	{
		typename basic_istream<char,traits>::sentry s(is);
		int n = is.width();
		if(n == 0){
			n = __STRING_MAX_UNITS;
		}
		is.get(c, n);
		return is;
	}
	template<class traits> _UCXXEXPORT basic_istream<char,traits>&
		operator>>(basic_istream<char,traits>& is, signed char* c)
	{
		typename basic_istream<char,traits>::sentry s(is);
		int n = is.width();
		if(n == 0){
			n = __STRING_MAX_UNITS;
		}
		is.get(c, n);
		return is;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(basic_istream<charT,traits>& (*pf)(basic_istream<charT,traits>&))
	{
		sentry(*this);
		pf(*this);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>& 
		basic_istream<charT,traits>::operator>>(basic_ios<charT,traits>& (*pf)(basic_ios<charT,traits>&))
	{
		sentry(*this);
		pf(*this);
		return *this;
	}

	template <class charT, class traits> _UCXXEXPORT basic_istream<charT,traits>&
		ws(basic_istream<charT,traits>& is)
	{
		__skipws(is);
		return is;
	}


#ifdef __UCLIBCXX_EXPAND_ISTREAM_CHAR__
#ifndef __UCLIBCXX_COMPILE_ISTREAM__


	template <> _UCXXEXPORT istream & basic_istream<char, char_traits<char> >::get(char & c);
	template <> _UCXXEXPORT istream::int_type basic_istream<char, char_traits<char> >::get();

	template <> _UCXXEXPORT istream & istream::operator>>(bool &n);
	template <> _UCXXEXPORT istream & istream::operator>>(short &n);
	template <> _UCXXEXPORT istream & istream::operator>>(unsigned short &n);
	template <> _UCXXEXPORT istream & istream::operator>>(int &n);
	template <> _UCXXEXPORT istream & istream::operator>>(unsigned int &n);
	template <> _UCXXEXPORT istream & istream::operator>>(long unsigned &n);
	template <> _UCXXEXPORT istream & istream::operator>>(long int &n);
	template <> _UCXXEXPORT istream & istream::operator>>(void *& p);

#ifdef __UCLIBCXX_HAS_FLOATS__
	template <> _UCXXEXPORT istream & istream::operator>>(float &f);
	template <> _UCXXEXPORT istream & istream::operator>>(double &f);
	template <> _UCXXEXPORT istream & istream::operator>>(long double &f);
#endif

	template <> _UCXXEXPORT istream & operator>>(istream & is, char & c);

	template <> _UCXXEXPORT void __skipws(basic_istream<char,char_traits<char> >& is);

#endif
#endif
	


}

#pragma GCC visibility pop

#endif