/*
* Copyright (c) 1999
* Silicon Graphics Computer Systems, Inc.
*
* Copyright (c) 1999
* Boris Fomitchev
*
* This material is provided "as is", with absolutely no warranty expressed
* or implied. Any use is at your own risk.
*
* Permission to use or copy this software for any purpose is hereby granted
* without fee, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
#ifndef _STLP_ISTREAM_C
#define _STLP_ISTREAM_C
#ifndef _STLP_INTERNAL_ISTREAM
# include <stl/_istream.h>
#endif
#ifndef _STLP_INTERNAL_LIMITS
# include <stl/_limits.h>
#endif
#ifndef _STLP_INTERNAL_NUM_GET_H
# include <stl/_num_get.h>
#endif
#if defined ( _STLP_NESTED_TYPE_PARAM_BUG )
// no wchar_t is supported for this mode
# define __BIS_int_type__ int
# define __BIS_pos_type__ streampos
# define __BIS_off_type__ streamoff
#else
# define __BIS_int_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_istream<_CharT, _Traits>::int_type
# define __BIS_pos_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_istream<_CharT, _Traits>::pos_type
# define __BIS_off_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_istream<_CharT, _Traits>::off_type
#endif
_STLP_BEGIN_NAMESPACE
//----------------------------------------------------------------------
// Function object structs used by some member functions.
_STLP_MOVE_TO_PRIV_NAMESPACE
template <class _Traits>
struct _Is_not_wspace {
typedef typename _Traits::char_type argument_type;
typedef bool result_type;
const ctype<argument_type>* _M_ctype;
_Is_not_wspace(const ctype<argument_type>* __c_type) : _M_ctype(__c_type) {}
bool operator()(argument_type __c) const
{ return !_M_ctype->is(ctype_base::space, __c); }
};
template <class _Traits>
struct _Is_wspace_null {
typedef typename _Traits::char_type argument_type;
typedef bool result_type;
const ctype<argument_type>* _M_ctype;
_Is_wspace_null(const ctype<argument_type>* __c_type) : _M_ctype(__c_type) {}
bool operator()(argument_type __c) const {
return _Traits::eq(__c, argument_type()) ||
_M_ctype->is(ctype_base::space, __c);
}
};
template <class _Traits>
struct _Scan_for_wspace {
typedef typename _Traits::char_type char_type;
typedef char_type* first_argument_type;
typedef char_type* second_argument_type;
typedef char_type* result_type;
const ctype<char_type>* _M_ctype;
_Scan_for_wspace(const ctype<char_type>* __ctype) : _M_ctype(__ctype) {}
const char_type*
operator()(const char_type* __first, const char_type* __last) const {
return _M_ctype->scan_is(ctype_base::space, __first, __last);
}
};
template <class _Traits>
struct _Scan_wspace_null {
typedef typename _Traits::char_type char_type;
typedef char_type* first_argument_type;
typedef char_type* second_argument_type;
typedef char_type* result_type;
const ctype<char_type>* _M_ctype;
_Scan_wspace_null(const ctype<char_type>* __c_type) : _M_ctype(__c_type) {}
const char_type*
operator()(const char_type* __first, const char_type* __last) const {
__last = find_if(__first, __last,
_Eq_char_bound<_Traits>(char_type()));
return _M_ctype->scan_is(ctype_base::space, __first, __last);
}
};
template <class _Traits>
struct _Scan_for_not_wspace {
typedef typename _Traits::char_type char_type;
typedef char_type* first_argument_type;
typedef char_type* second_argument_type;
typedef char_type* result_type;
const ctype<char_type>* _M_ctype;
_Scan_for_not_wspace(const ctype<char_type>* __c_type) : _M_ctype(__c_type) {}
const char_type*
operator()(const char_type* __first, const char_type* __last) const {
return _M_ctype->scan_not(ctype_base::space, __first, __last);
}
};
template <class _Traits>
struct _Scan_for_char_val {
typedef typename _Traits::char_type char_type;
typedef char_type* first_argument_type;
typedef char_type* second_argument_type;
typedef char_type* result_type;
char_type _M_val;
_Scan_for_char_val(char_type __val) : _M_val(__val) {}
const char_type*
operator()(const char_type* __first, const char_type* __last) const {
return find_if(__first, __last, _Eq_char_bound<_Traits>(_M_val));
}
};
template <class _Traits>
struct _Scan_for_int_val {
typedef typename _Traits::char_type char_type;
typedef typename _Traits::int_type int_type;
typedef char_type* first_argument_type;
typedef char_type* second_argument_type;
typedef char_type* result_type;
int_type _M_val;
_Scan_for_int_val(int_type __val) : _M_val(__val) {}
const char_type*
operator()(const char_type* __first, const char_type* __last) const {
return find_if(__first, __last,
_Eq_int_bound<_Traits>(_M_val));
}
};
// Helper function: try to push back a character to a streambuf,
// return true if the pushback succeeded. Does not throw.
template <class _CharT, class _Traits>
bool _STLP_CALL
__pushback(basic_streambuf<_CharT, _Traits>* __buf, _CharT __c) {
bool ret;
_STLP_TRY {
const typename _Traits::int_type __eof = _Traits::eof();
ret = !_Traits::eq_int_type(__buf->sputbackc(__c), __eof);
}
_STLP_CATCH_ALL {
ret = false;
}
return ret;
}
//----------------------------------------------------------------------
// Definitions of basic_istream<>'s noninline member functions.
// Helper function for formatted input of numbers.
template <class _CharT, class _Traits, class _Number>
ios_base::iostate _STLP_CALL
__get_num(basic_istream<_CharT, _Traits>& __that, _Number& __val) {
typedef typename basic_istream<_CharT, _Traits>::sentry _Sentry;
ios_base::iostate __err = 0;
_Sentry __sentry( __that ); // Skip whitespace.
if (__sentry) {
typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> > _Num_get;
_STLP_TRY {
((const _Num_get&)use_facet<_Num_get>(__that.getloc())).get(istreambuf_iterator<_CharT, _Traits>(__that.rdbuf()),
0, __that, __err, __val);
}
_STLP_CATCH_ALL {
__that._M_handle_exception(ios_base::badbit);
}
if (__err) __that.setstate(__err);
}
return __err;
}
_STLP_MOVE_TO_STD_NAMESPACE
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (short& __val) {
long __lval;
_STLP_PRIV __get_num(*this, __lval);
if ( this->fail() ) {
return *this;
}
short __tmp = __STATIC_CAST(short, __lval);
unsigned short __uval = __STATIC_CAST(unsigned short, __lval);
// check if we lose digits
// if ((__val != __lval) && ((unsigned short)__val != __lval))
if ((__tmp != __lval) && ((long)__uval != __lval))
this->setstate(ios_base::failbit);
else
__val = __tmp;
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (int& __val) {
long __lval;
_STLP_PRIV __get_num(*this, __lval);
if ( this->fail() ) {
return *this;
}
int __tmp = __lval;
unsigned int __uval = __lval;
// check if we lose digits
// if ((__val != __lval) && ((unsigned int)__val != __lval))
if ((__tmp != __lval) && ((long)__uval != __lval))
this->setstate(ios_base::failbit);
else
__val = __tmp;
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (unsigned short& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (unsigned int& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (long& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (unsigned long& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
#if defined (_STLP_LONG_LONG)
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (_STLP_LONG_LONG& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (unsigned _STLP_LONG_LONG& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
#endif
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (float& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (double& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
#if !defined (_STLP_NO_LONG_DOUBLE)
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (long double& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
#endif
#if !defined (_STLP_NO_BOOL)
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (bool& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
#endif
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>> (void*& __val) {
_STLP_PRIV __get_num(*this, __val);
return *this;
}
// Unformatted input
template <class _CharT, class _Traits>
__BIS_int_type__
basic_istream<_CharT, _Traits>::peek() {
typename _Traits::int_type __tmp = _Traits::eof();
this->_M_gcount = 0;
sentry __sentry(*this, _No_Skip_WS());
if (__sentry) {
_STLP_TRY {
__tmp = this->rdbuf()->sgetc();
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
}
if (this->_S_eof(__tmp))
this->setstate(ios_base::eofbit);
}
return __tmp;
}
template <class _CharT, class _Traits>
__BIS_int_type__
basic_istream<_CharT, _Traits>::get() {
typename _Traits::int_type __tmp = _Traits::eof();
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
_STLP_TRY {
__tmp = this->rdbuf()->sbumpc();
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
}
if (!this->_S_eof(__tmp))
this->_M_gcount = 1;
}
if (_M_gcount == 0)
this->setstate(ios_base::eofbit | ios_base::failbit);
return __tmp;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::get(_CharT& __c) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
typename _Traits::int_type __tmp = _Traits::eof();
_STLP_TRY {
__tmp = this->rdbuf()->sbumpc();
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
}
if (!this->_S_eof(__tmp)) {
this->_M_gcount = 1;
__c = _Traits::to_char_type(__tmp);
}
}
if (this->_M_gcount == 0)
this->setstate(ios_base::eofbit | ios_base::failbit);
return *this;
}
// Read characters and discard them. The standard specifies a single
// function with two arguments, each with a default. We instead use
// three overloded functions, because it's possible to implement the
// first two more efficiently than the fully general third version.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::ignore() {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
int_type __c;
_STLP_TRY {
__c = this->rdbuf()->sbumpc();
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
return *this;
}
if (!this->_S_eof(__c))
this->_M_gcount = 1;
else
this->setstate(ios_base::eofbit);
}
return *this;
}
// Putback
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::putback(_CharT __c) {
this->_M_gcount = 0;
sentry __sentry(*this, _No_Skip_WS());
if (__sentry) {
typename _Traits::int_type __tmp = _Traits::eof();
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
// if (!__buf || this->_S_eof(__buf->sputbackc(__c)))
if (__buf) {
_STLP_TRY {
__tmp = __buf->sputbackc(__c);
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
}
}
if (this->_S_eof(__tmp))
this->setstate(ios_base::badbit);
}
else
this->setstate(ios_base::failbit);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::unget() {
this->_M_gcount = 0;
sentry __sentry(*this, _No_Skip_WS());
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
// if (!__buf || _Traits::eq_int_type(__buf->sungetc(), _Traits::eof()))
if (__buf) {
_STLP_TRY {
if (this->_S_eof(__buf->sungetc()))
this->setstate(ios_base::badbit);
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
}
} else
this->setstate(ios_base::badbit);
}
else
this->setstate(ios_base::failbit);
return *this;
}
// Positioning and buffer control.
template <class _CharT, class _Traits>
int basic_istream<_CharT, _Traits>::sync() {
sentry __sentry(*this, _No_Skip_WS());
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
if (__buf) {
if (__buf->pubsync() == -1) {
this->setstate(ios_base::badbit);
return -1;
}
else
return 0;
}
else
return -1;
}
template <class _CharT, class _Traits>
__BIS_pos_type__
basic_istream<_CharT, _Traits>::tellg() {
sentry __sentry(*this, _No_Skip_WS());
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
return (__buf && !this->fail()) ? __buf->pubseekoff(0, ios_base::cur, ios_base::in)
: pos_type(-1);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::seekg(pos_type __pos) {
sentry __sentry(*this, _No_Skip_WS());
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
if (!this->fail() && __buf) {
if (__buf->pubseekpos(__pos) == pos_type(-1)) {
this->setstate(ios_base::failbit);
}
}
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::seekg(off_type __off, ios_base::seekdir __dir) {
sentry __sentry(*this, _No_Skip_WS());
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
if (!this->fail() && __buf)
__buf->pubseekoff(__off, __dir);
return *this;
}
// Formatted input of characters and character arrays.
template <class _CharT, class _Traits>
void basic_istream<_CharT, _Traits>::_M_formatted_get(_CharT& __c) {
// typename _Traits::int_type __tmp = _Traits::eof();
sentry __sentry(*this); // Skip whitespace.
if (__sentry) {
typename _Traits::int_type __tmp;// = _Traits::eof();
_STLP_TRY {
__tmp = this->rdbuf()->sbumpc();
}
_STLP_CATCH_ALL {
this->_M_handle_exception(ios_base::badbit);
return;
}
if (!this->_S_eof(__tmp))
__c = _Traits::to_char_type(__tmp);
else
this->setstate(ios_base::eofbit | ios_base::failbit);
}
}
//---------------------------------------------------------------------------
// istream's helper functions.
// A generic function for unbuffered input. We stop when we reach EOF,
// or when we have extracted _Num characters, or when the function object
// __is_delim return true. In the last case, it extracts the character
// for which __is_delim is true, if and only if __extract_delim is true.
// It appends a null character to the end of the string; this means that
// it may store up to _Num + 1 characters.
//
// __is_getline governs two corner cases: reading _Num characters without
// encountering delim or eof (in which case failbit is set if __is_getline
// is true); and reading _Num characters where the _Num+1'st character is
// eof (in which case eofbit is set if __is_getline is true).
//
// It is assumed that __is_delim never throws.
//
// Return value is the number of characters extracted, including the
// delimiter if it is extracted. Note that the number of characaters
// extracted isn't necessarily the same as the number stored.
_STLP_MOVE_TO_PRIV_NAMESPACE
template < class _CharT, class _Traits, class _Is_Delim>
streamsize _STLP_CALL
__read_unbuffered(basic_istream<_CharT, _Traits>* __that, basic_streambuf<_CharT, _Traits>* __buf,
streamsize _Num, _CharT* __s,
_Is_Delim __is_delim,
bool __extract_delim, bool __append_null,
bool __is_getline) {
streamsize __n = 0;
ios_base::iostate __status = 0;
typedef typename basic_istream<_CharT, _Traits>::int_type int_type;
// The operations that can potentially throw are sbumpc, snextc, and sgetc.
_STLP_TRY {
for (;;) {
int_type __c = __buf->sbumpc(); // sschwarz
if (__that->_S_eof(__c)) {
if (__n < _Num || __is_getline)
__status |= ios_base::eofbit;
break;
}
else if (__is_delim(_Traits::to_char_type(__c))) {
if (__extract_delim) { // Extract and discard current character.
++__n;
} else if ( !__pushback(__buf, _Traits::to_char_type(__c)) ) { // leave delimiter
__status |= ios_base::failbit;
}
break;
}
else { // regular character
*__s++ = _Traits::to_char_type(__c);
++__n;
}
if (__n == _Num) {
if (__is_getline) // didn't find delimiter as one of the _Num chars
__status |= ios_base::failbit;
break;
}
}
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
*__s = _STLP_DEFAULT_CONSTRUCTED(_CharT);
return __n;
}
if (__append_null)
*__s = _STLP_DEFAULT_CONSTRUCTED(_CharT);
if (__status)
__that->setstate(__status); // This might throw.
return __n;
}
// Much like __read_unbuffered, but with one additional function object:
// __scan_delim(first, last) returns the first pointer p in [first, last)
// such that __is_delim(p) is true.
template < class _CharT, class _Traits, class _Is_Delim, class _Scan_Delim>
streamsize _STLP_CALL
__read_buffered(basic_istream<_CharT, _Traits>* __that, basic_streambuf<_CharT, _Traits>* __buf,
streamsize _Num, _CharT* __s,
_Is_Delim __is_delim, _Scan_Delim __scan_delim,
bool __extract_delim, bool __append_null,
bool __is_getline) {
streamsize __n = 0;
ios_base::iostate __status = 0;
bool __done = false;
_STLP_TRY {
while (__buf->_M_egptr() != __buf->_M_gptr() && !__done) {
const _CharT* __first = __buf->_M_gptr();
const _CharT* __last = __buf->_M_egptr();
//casting numeric_limits<ptrdiff_t>::max to streamsize only works is ptrdiff_t is signed or streamsize representation
//is larger than ptrdiff_t one.
_STLP_STATIC_ASSERT((sizeof(streamsize) > sizeof(ptrdiff_t)) ||
(sizeof(streamsize) == sizeof(ptrdiff_t)) && numeric_limits<ptrdiff_t>::is_signed)
ptrdiff_t __request = __STATIC_CAST(ptrdiff_t, (min) (__STATIC_CAST(streamsize, (numeric_limits<ptrdiff_t>::max)()), _Num - __n));
const _CharT* __p = __scan_delim(__first, __last);
ptrdiff_t __chunk = (min) (ptrdiff_t(__p - __first), __request);
_Traits::copy(__s, __first, __chunk);
__s += __chunk;
__n += __chunk;
__buf->_M_gbump((int)__chunk);
// We terminated by finding delim.
if (__p != __last && __p - __first <= __request) {
if (__extract_delim) {
__n += 1;
__buf->_M_gbump(1);
}
__done = true;
}
// We terminated by reading all the characters we were asked for.
else if (__n == _Num) {
// Find out if we have reached eof. This matters for getline.
if (__is_getline) {
if (__chunk == __last - __first) {
if (__that->_S_eof(__buf->sgetc()))
__status |= ios_base::eofbit;
}
else
__status |= ios_base::failbit;
}
__done = true;
}
// The buffer contained fewer than _Num - __n characters. Either we're
// at eof, or we should refill the buffer and try again.
else {
if (__that->_S_eof(__buf->sgetc())) {
__status |= ios_base::eofbit;
__done = true;
}
}
} // Close the while loop.
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
__done = true;
}
if (__done) {
if (__append_null)
*__s = _STLP_DEFAULT_CONSTRUCTED(_CharT);
if (__status != 0)
__that->setstate(__status); // This might throw.
return __n;
}
// If execution has reached this point, then we have an empty buffer but
// we have not reached eof. What that means is that the streambuf has
// decided to switch from buffered to unbuffered input. We switch to
// to __read_unbuffered.
return __n + __read_unbuffered(__that, __buf, _Num - __n, __s, __is_delim,
__extract_delim,__append_null,__is_getline);
}
_STLP_MOVE_TO_STD_NAMESPACE
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::get(_CharT* __s, streamsize __n,
_CharT __delim) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
if (__n > 0) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
if (__buf->egptr() != __buf->gptr())
this->_M_gcount =
_STLP_PRIV __read_buffered(this, __buf, __n - 1, __s,
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
_STLP_PRIV _Scan_for_char_val<_Traits>(__delim),
false, true, false);
else
this->_M_gcount =
_STLP_PRIV __read_unbuffered(this, __buf, __n - 1, __s,
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
false, true, false);
}
}
if (this->_M_gcount == 0)
this->setstate(ios_base::failbit);
return *this;
}
// Getline is essentially identical to get, except that it extracts
// the delimiter.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::getline(_CharT* __s, streamsize __n,
_CharT __delim) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
if (__n > 0) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
this->_M_gcount = __buf->egptr() != __buf->gptr()
? _STLP_PRIV __read_buffered(this, __buf, __n - 1, __s,
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
_STLP_PRIV _Scan_for_char_val<_Traits>(__delim),
true, true, true)
: _STLP_PRIV __read_unbuffered(this, __buf, __n - 1, __s,
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
true, true, true);
}
}
if (this->_M_gcount == 0)
this->setstate(ios_base::failbit);
return *this;
}
// Read n characters. We don't look for any delimiter, and we don't
// put in a terminating null character.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::read(char_type* __s, streamsize __n) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry && !this->eof()) {
basic_streambuf<_CharT, _Traits>*__buf = this->rdbuf();
if (__buf->gptr() != __buf->egptr())
_M_gcount
= _STLP_PRIV __read_buffered(this, __buf, __n, __s,
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
_STLP_PRIV _Project2nd<const _CharT*, const _CharT*>(),
false, false, false);
else
_M_gcount
= _STLP_PRIV __read_unbuffered(this, __buf, __n, __s,
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
false, false, false);
}
else
this->setstate(ios_base::failbit);
if (this->eof())
this->setstate(ios_base::eofbit | ios_base::failbit);
return *this;
}
// Read n or fewer characters. We don't look for any delimiter, and
// we don't put in a terminating null character.
template <class _CharT, class _Traits>
streamsize
basic_istream<_CharT, _Traits>::readsome(char_type* __s, streamsize __nmax) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry && !this->eof() && __nmax >= 0) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
streamsize __avail = __buf->in_avail();
// fbp : isn't full-blown setstate required here ?
if (__avail == -1)
this->_M_setstate_nothrow(ios_base::eofbit);
else if (__avail != 0) {
if (__buf->gptr() != __buf->egptr())
_M_gcount
= _STLP_PRIV __read_buffered(this, __buf, (min) (__avail, __nmax), __s,
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
_STLP_PRIV _Project2nd<const _CharT*, const _CharT*>(),
false, false, false);
else
_M_gcount
= _STLP_PRIV __read_unbuffered(this, __buf, (min) (__avail, __nmax), __s,
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
false, false, false);
}
}
else {
// fbp : changed so that failbit is set only there, to pass Dietmar's test
if (this->eof())
this->setstate(ios_base::eofbit | ios_base::failbit);
else
this->setstate(ios_base::failbit);
}
// if (this->eof())
// this->setstate(ios_base::eofbit | ios_base::failbit);
return _M_gcount;
}
template <class _CharT, class _Traits>
void basic_istream<_CharT, _Traits>::_M_formatted_get(_CharT* __s) {
sentry __sentry(*this); // Skip whitespace.
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
streamsize __nmax = this->width() > 0
? this->width() - 1
: ((numeric_limits<streamsize>::max)() / sizeof(_CharT)) - 1;
streamsize __n = __buf->gptr() != __buf->egptr()
? _STLP_PRIV __read_buffered(this, __buf, __nmax, __s,
_STLP_PRIV _Is_wspace_null<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
_STLP_PRIV _Scan_wspace_null<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
false, true, false)
: _STLP_PRIV __read_unbuffered(this, __buf, __nmax, __s,
_STLP_PRIV _Is_wspace_null<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
false, true, false);
if (__n == 0)
this->setstate(ios_base::failbit);
}
this->width(0);
}
// A generic unbuffered function for ignoring characters. We stop
// when we reach EOF, or when the function object __is_delim returns
// true. In the last case, it extracts the character for which
// __is_delim is true, if and only if __extract_delim is true.
template < class _CharT, class _Traits, class _Is_Delim>
void _STLP_CALL
_M_ignore_unbuffered(basic_istream<_CharT, _Traits>* __that,
basic_streambuf<_CharT, _Traits>* __buf,
_Is_Delim __is_delim,
bool __extract_delim, bool __set_failbit) {
bool __done = false;
ios_base::iostate __status = 0;
typedef typename basic_istream<_CharT, _Traits>::int_type int_type;
_STLP_TRY {
while (!__done) {
int_type __c = __buf->sbumpc();
if (__that->_S_eof(__c)) {
__done = true;
__status |= __set_failbit ? ios_base::eofbit | ios_base::failbit
: ios_base::eofbit;
}
else if (__is_delim(_Traits::to_char_type(__c))) {
__done = true;
if (!__extract_delim)
if (__that->_S_eof(__buf->sputbackc(_Traits::to_char_type(__c))))
__status |= ios_base::failbit;
}
}
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
}
__that->setstate(__status);
}
// A generic buffered function for ignoring characters. Much like
// _M_ignore_unbuffered, but with one additional function object:
// __scan_delim(first, last) returns the first pointer p in [first,
// last) such that __is_delim(p) is true.
template < class _CharT, class _Traits, class _Is_Delim, class _Scan_Delim>
void _STLP_CALL
_M_ignore_buffered(basic_istream<_CharT, _Traits>* __that,
basic_streambuf<_CharT, _Traits>* __buf,
_Is_Delim __is_delim, _Scan_Delim __scan_delim,
bool __extract_delim, bool __set_failbit) {
bool __at_eof = false;
bool __found_delim = false;
_STLP_TRY {
while (__buf->_M_egptr() != __buf->_M_gptr() && !__at_eof && !__found_delim) {
const _CharT* __p = __scan_delim(__buf->_M_gptr(), __buf->_M_egptr());
__buf->_M_gbump((int)(__p - __buf->_M_gptr()));
if (__p != __buf->_M_egptr()) { // We found delim, so we're done.
if (__extract_delim)
__buf->_M_gbump(1);
__found_delim = true;
}
else // No delim. Try to refil the buffer.
__at_eof = __that->_S_eof(__buf->sgetc());
} // Close the while loop.
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
return;
}
if (__at_eof) {
__that->setstate(__set_failbit ? ios_base::eofbit | ios_base::failbit
: ios_base::eofbit);
return;
}
if (__found_delim)
return;
// If execution has reached this point, then we have an empty buffer but
// we have not reached eof. What that means is that the streambuf has
// decided to switch from a buffered to an unbuffered mode. We switch
// to _M_ignore_unbuffered.
_M_ignore_unbuffered(__that, __buf, __is_delim, __extract_delim, __set_failbit);
}
// Overloaded versions of _M_ignore_unbuffered and _M_ignore_unbuffered
// with an explicit count _Num. Return value is the number of
// characters extracted.
//
// The function object __max_chars takes two arguments, _Num and __n
// (the latter being the number of characters we have already read),
// and returns the maximum number of characters to read from the buffer.
// We parameterize _M_ignore_buffered so that we can use it for both
// bounded and unbounded input; for the former the function object should
// be minus<>, and for the latter it should return a constant maximum value.
template < class _CharT, class _Traits, class _Max_Chars, class _Is_Delim>
streamsize _STLP_CALL
_M_ignore_unbuffered(basic_istream<_CharT, _Traits>* __that,
basic_streambuf<_CharT, _Traits>* __buf,
streamsize _Num, _Max_Chars __max_chars,
_Is_Delim __is_delim,
bool __extract_delim, bool __set_failbit) {
streamsize __n = 0;
ios_base::iostate __status = 0;
typedef typename basic_istream<_CharT, _Traits>::int_type int_type;
_STLP_TRY {
while (__max_chars(_Num, __n) > 0) {
int_type __c = __buf->sbumpc();
if (__that->_S_eof(__c)) {
__status |= __set_failbit ? ios_base::eofbit | ios_base::failbit
: ios_base::eofbit;
break;
}
else if (__is_delim(_Traits::to_char_type(__c))) {
if (__extract_delim)
++__n;
else if (__that->_S_eof(__buf->sputbackc(_Traits::to_char_type(__c))))
__status |= ios_base::failbit;
break;
}
// fbp : added counter increment to pass Dietmar's test
++__n;
}
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
}
if (__status)
__that->setstate(__status); // This might throw.
return __n;
}
template < class _CharT, class _Traits, class _Max_Chars, class _Is_Delim, class _Scan_Delim>
streamsize _STLP_CALL
_M_ignore_buffered(basic_istream<_CharT, _Traits>* __that,
basic_streambuf<_CharT, _Traits>* __buf,
streamsize _Num,
_Max_Chars __max_chars,
_Is_Delim __is_delim, _Scan_Delim __scan_delim,
bool __extract_delim, bool __set_failbit) {
streamsize __n = 0;
bool __at_eof = false;
bool __done = false;
_STLP_TRY {
while (__buf->_M_egptr() != __buf->_M_gptr() && !__done) {
ptrdiff_t __avail = __buf->_M_egptr() - __buf->_M_gptr();
streamsize __m = __max_chars(_Num, __n);
if (__avail >= __m) { // We have more characters than we need.
const _CharT* __last = __buf->_M_gptr() + __STATIC_CAST(ptrdiff_t, __m);
const _CharT* __p = __scan_delim(__buf->_M_gptr(), __last);
ptrdiff_t __chunk = __p - __buf->_M_gptr();
__n += __chunk;
__buf->_M_gbump((int)__chunk);
if (__extract_delim && __p != __last) {
__n += 1;
__buf->_M_gbump(1);
}
__done = true;
}
else {
const _CharT* __p = __scan_delim(__buf->_M_gptr(), __buf->_M_egptr());
ptrdiff_t __chunk = __p - __buf->_M_gptr();
__n += __chunk;
__buf->_M_gbump((int)__chunk);
if (__p != __buf->_M_egptr()) { // We found delim.
if (__extract_delim) {
__n += 1;
__buf->_M_gbump(1);
}
__done = true;
}
// We didn't find delim. Try to refill the buffer.
else if (__that->_S_eof(__buf->sgetc())) {
__done = true;
__at_eof = true;
}
}
} // Close the while loop.
}
_STLP_CATCH_ALL {
__that->_M_handle_exception(ios_base::badbit);
return __n;
}
if (__at_eof)
__that->setstate(__set_failbit ? ios_base::eofbit | ios_base::failbit
: ios_base::eofbit);
if (__done)
return __n;
// If execution has reached this point, then we have an empty buffer but
// we have not reached eof. What that means is that the streambuf has
// decided to switch from buffered to unbuffered input. We switch to
// to _M_ignore_unbuffered.
return __n + _M_ignore_unbuffered(__that, __buf, _Num, __max_chars,
__is_delim, __extract_delim, __set_failbit);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::ignore(streamsize __n) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
typedef _STLP_PRIV _Constant_unary_fun<bool, int_type> _Const_bool;
typedef _STLP_PRIV _Constant_binary_fun<streamsize, streamsize, streamsize> _Const_streamsize;
const streamsize __maxss = (numeric_limits<streamsize>::max)();
if (__n == (numeric_limits<int>::max)()) {
if (__buf->gptr() != __buf->egptr())
_M_gcount = _M_ignore_buffered(this, __buf,
__maxss, _Const_streamsize(__maxss),
_Const_bool(false),
_STLP_PRIV _Project2nd<const _CharT*, const _CharT*>(),
false, false);
else
_M_gcount = _M_ignore_unbuffered(this, __buf,
__maxss, _Const_streamsize(__maxss),
_Const_bool(false), false, false);
}
else {
if (__buf->gptr() != __buf->egptr())
_M_gcount = _M_ignore_buffered(this, __buf,
__n, minus<streamsize>(),
_Const_bool(false),
_STLP_PRIV _Project2nd<const _CharT*, const _CharT*>(),
false, false);
else
_M_gcount = _M_ignore_unbuffered(this, __buf, __n, minus<streamsize>(),
_Const_bool(false), false, false);
}
}
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::ignore(streamsize __n, int_type __delim) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
typedef _STLP_PRIV _Constant_unary_fun<bool, int_type> _Const_bool;
typedef _STLP_PRIV _Constant_binary_fun<streamsize, streamsize, streamsize>
_Const_streamsize;
const streamsize __maxss = (numeric_limits<streamsize>::max)();
if (__n == (numeric_limits<int>::max)()) {
if (__buf->gptr() != __buf->egptr())
_M_gcount = _M_ignore_buffered(this, __buf,
__maxss, _Const_streamsize(__maxss),
_STLP_PRIV _Eq_int_bound<_Traits>(__delim),
_STLP_PRIV _Scan_for_int_val<_Traits>(__delim),
true, false);
else
_M_gcount = _M_ignore_unbuffered(this, __buf,
__maxss, _Const_streamsize(__maxss),
_STLP_PRIV _Eq_int_bound<_Traits>(__delim),
true, false);
}
else {
if (__buf->gptr() != __buf->egptr())
_M_gcount = _M_ignore_buffered(this, __buf,
__n, minus<streamsize>(),
_STLP_PRIV _Eq_int_bound<_Traits>(__delim),
_STLP_PRIV _Scan_for_int_val<_Traits>(__delim),
true, false);
else
_M_gcount = _M_ignore_unbuffered(this, __buf, __n, minus<streamsize>(),
_STLP_PRIV _Eq_int_bound<_Traits>(__delim),
true, false);
}
}
return *this;
}
// This member function does not construct a sentry object, because
// it is called from sentry's constructor.
template <class _CharT, class _Traits>
void basic_istream<_CharT, _Traits>::_M_skip_whitespace(bool __set_failbit) {
basic_streambuf<_CharT, _Traits>* __buf = this->rdbuf();
if (!__buf)
this->setstate(ios_base::badbit);
else if (__buf->gptr() != __buf->egptr())
_M_ignore_buffered(this, __buf,
_STLP_PRIV _Is_not_wspace<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
_STLP_PRIV _Scan_for_not_wspace<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
false, __set_failbit);
else
_M_ignore_unbuffered(this, __buf,
_STLP_PRIV _Is_not_wspace<_Traits>(__STATIC_CAST(const ctype<_CharT>*, this->_M_ctype_facet())),
false, __set_failbit);
}
// This is a very simple loop that reads characters from __src and puts
// them into __dest. It looks complicated because of the (standard-
// mandated) exception handling policy.
//
// We stop when we get an exception, when we fail to insert into the
// output streambuf, or when __is_delim is true.
_STLP_MOVE_TO_PRIV_NAMESPACE
template < class _CharT, class _Traits, class _Is_Delim>
streamsize _STLP_CALL
__copy_unbuffered(basic_istream<_CharT, _Traits>* __that, basic_streambuf<_CharT, _Traits>* __src,
basic_streambuf<_CharT, _Traits>* __dest,
_Is_Delim __is_delim,
bool __extract_delim, bool __rethrow) {
streamsize __extracted = 0;
ios_base::iostate __status = 0;
typedef typename basic_istream<_CharT, _Traits>::int_type int_type;
int_type __c;
_STLP_TRY {
for (;;) {
// Get a character. If there's an exception, catch and (maybe) rethrow it.
__c = __src->sbumpc();
// If we failed to get a character, then quit.
if (__that->_S_eof(__c)) {
__status |= ios_base::eofbit;
break;
}
// If it's the delimiter, then quit.
else if (__is_delim(_Traits::to_char_type(__c))) {
if (!__extract_delim && !__pushback(__src, _Traits::to_char_type(__c)))
__status |= ios_base::failbit;
break;
}
else {
// Try to put the character in the output streambuf.
bool __failed = false;
_STLP_TRY {
if (!__that->_S_eof(__dest->sputc(_Traits::to_char_type(__c))))
++__extracted;
else
__failed = true;
}
_STLP_CATCH_ALL {
__failed = true;
}
// If we failed to put the character in the output streambuf, then
// try to push it back to the input streambuf.
if (__failed && !__pushback(__src, _Traits::to_char_type(__c)))
__status |= ios_base::failbit;
// fbp : avoiding infinite loop in io-27-6-1-2-3.exp
if (__failed)
break;
}
} /* for (;;) */
}
// fbp : this try/catch moved here in reasonable assumption
// __is_delim never throw (__pushback is guaranteed not to)
_STLP_CATCH_ALL {
// See 27.6.1.2.3, paragraph 13.
if (__rethrow && __extracted == 0)
__that->_M_handle_exception(ios_base::failbit);
}
__that->setstate(__status);
return __extracted;
}
// Buffered copying from one streambuf to another. We copy the characters
// in chunks, rather than one at a time. We still have to worry about all
// of the error conditions we checked in __copy_unbuffered, plus one more:
// the streambuf might decide to switch from a buffered to an unbuffered mode.
template < class _CharT, class _Traits, class _Is_Delim, class _Scan_Delim>
streamsize _STLP_CALL
__copy_buffered(basic_istream<_CharT, _Traits>* __that, basic_streambuf<_CharT, _Traits>* __src,
basic_streambuf<_CharT, _Traits>* __dest,
_Scan_Delim __scan_delim, _Is_Delim __is_delim,
bool __extract_delim, bool __rethrow) {
streamsize __extracted = 0;
ios_base::iostate __status = 0;
typedef typename basic_istream<_CharT, _Traits>::int_type int_type;
//Borland compiler generates a warning if assignment because value is never used:
int_type __c /*= _Traits::eof()*/;
_CharT* __first = __src->_M_gptr();
ptrdiff_t __avail = __src->_M_egptr() - __first;
// fbp : introduced to move catch/try blocks out of the loop
bool __do_handle_exceptions = false;
_STLP_TRY {
for (;;) {
const _CharT* __last = __scan_delim(__first, __src->_M_egptr());
// Try to copy the entire input buffer to the output buffer.
streamsize __n = __dest->sputn(__first, __extract_delim && __last != __src->_M_egptr()
? (__last - __first) + 1
: (__last - __first));
__src->_M_gbump((int)__n);
__extracted += __n;
// from this on, catch() will call _M_handle_exceptions()
__do_handle_exceptions = true;
if (__n < __avail) // We found the delimiter, or else failed to
break; // copy some characters.
__c = __src->sgetc();
// Three possibilities: we succeeded in refilling the buffer, or
// we got EOF, or the streambuf has switched to unbuffered mode.
__first = __src->_M_gptr();
__avail = __src->_M_egptr() - __first;
if (__avail > 0)
{} // dwa 1/16/00 -- suppress a Metrowerks warning
else if (__that->_S_eof(__c)) {
__status |= ios_base::eofbit;
break;
}
else {
return __extracted + __copy_unbuffered(__that, __src, __dest, __is_delim,
__extract_delim, __rethrow);
}
__do_handle_exceptions = false;
}
}
_STLP_CATCH_ALL {
// See 27.6.1.2.3, paragraph 13.
if (__rethrow && __do_handle_exceptions && __extracted == 0)
__that->_M_handle_exception(ios_base::failbit);
}
if (__status)
__that->setstate(__status); // This might throw.
return __extracted;
}
_STLP_MOVE_TO_STD_NAMESPACE
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>
::get(basic_streambuf<_CharT, _Traits>& __dest, _CharT __delim) {
sentry __sentry(*this, _No_Skip_WS());
this->_M_gcount = 0;
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __src = this->rdbuf();
if (__src)
this->_M_gcount = __src->egptr() != __src->gptr()
? _STLP_PRIV __copy_buffered(this, __src, &__dest,
_STLP_PRIV _Scan_for_char_val<_Traits>(__delim),
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
false, false)
: _STLP_PRIV __copy_unbuffered(this, __src, &__dest,
_STLP_PRIV _Eq_char_bound<_Traits>(__delim),
false, false);
}
if (this->_M_gcount == 0)
this->setstate(ios_base::failbit);
return *this;
}
// Copying characters into a streambuf.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>
::operator>>(basic_streambuf<_CharT, _Traits>* __dest) {
streamsize __n = 0;
typedef typename basic_istream<_CharT, _Traits>::sentry _Sentry;
_Sentry __sentry(*this);
if (__sentry) {
basic_streambuf<_CharT, _Traits>* __src = this->rdbuf();
if (__src && __dest)
__n = __src->egptr() != __src->gptr()
? _STLP_PRIV __copy_buffered(this, __src, __dest,
_STLP_PRIV _Project2nd<const _CharT*, const _CharT*>(),
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
false, true)
: _STLP_PRIV __copy_unbuffered(this, __src, __dest,
_STLP_PRIV _Constant_unary_fun<bool, int_type>(false),
false, true);
}
if (__n == 0)
this->setstate(ios_base::failbit);
return *this;
}
// ----------------------------------------------------------------
// basic_iostream<> class
// ----------------------------------------------------------------
template <class _CharT, class _Traits>
basic_iostream<_CharT, _Traits>
::basic_iostream(basic_streambuf<_CharT, _Traits>* __buf)
: basic_ios<_CharT, _Traits>(),
basic_istream<_CharT, _Traits>(__buf),
basic_ostream<_CharT, _Traits>(__buf) {
this->init(__buf);
}
_STLP_END_NAMESPACE
#undef __BIS_int_type__
#undef __BIS_pos_type__
#undef __BIS_off_type__
#endif /* _STLP_ISTREAM_C */
// Local Variables:
// mode:C++
// End: