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os/ossrv/stdcpp/src/strstream.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
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Update contrib. 
     1 /*

     2  * © Portions copyright (c) 2006-2007 Nokia Corporation.  All rights reserved.

     3  *

     4  * Copyright (c) 1999

     5  * Silicon Graphics Computer Systems, Inc.

     6  *

     7  * Copyright (c) 1999 

     8  * Boris Fomitchev

     9  *

    10  * This material is provided "as is", with absolutely no warranty expressed

    11  * or implied. Any use is at your own risk.

    12  *

    13  * Permission to use or copy this software for any purpose is hereby granted 

    14  * without fee, provided the above notices are retained on all copies.

    15  * Permission to modify the code and to distribute modified code is granted,

    16  * provided the above notices are retained, and a notice that the code was

    17  * modified is included with the above copyright notice.

    18  *

    19  */ 

    20 

    21 // Implementation of the classes in header <strstream>.

    22 // WARNING: The classes defined in <strstream> are DEPRECATED.  This

    23 // header is defined in section D.7.1 of the C++ standard, and it

    24 // MAY BE REMOVED in a future standard revision.  You should use the

    25 // header <sstream> instead.

    26 

    27 # include "stlport_prefix.h"

    28 #include <stl/_strstream.h>

    29 #include <stl/_algobase.h>

    30 

    31 _STLP_BEGIN_NAMESPACE

    32 

    33 // strstreambuf constructor, destructor.

    34 

    35 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(streamsize initial_capacity)

    36    :  _M_alloc_fun(0), _M_free_fun(0),

    37      _M_dynamic(true), _M_frozen(false), _M_constant(false)  

    38 #ifdef __SYMBIAN32__

    39     , _pfrozenendsave(NULL)

    40     ,_pgetfrozenendsave( NULL)

    41 #endif     

    42 {

    43   streamsize n = (max)(initial_capacity, streamsize(16));

    44 

    45   char* buf = _M_alloc(n);

    46 #ifdef __SYMBIAN32__  

    47   *buf = '\0';

    48 #endif  

    49   if (buf) {

    50     setp(buf, buf + n);

    51     setg(buf, buf, buf);

    52   }

    53 }

    54 

    55 

    56 

    57 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(__alloc_fn alloc_f, __free_fn free_f)

    58   : _M_alloc_fun(alloc_f), _M_free_fun(free_f),

    59     _M_dynamic(true), _M_frozen(false), _M_constant(false)

    60 #ifdef __SYMBIAN32__

    61     , _pfrozenendsave(NULL)

    62     ,_pgetfrozenendsave( NULL)

    63 #endif     

    64 {

    65   streamsize n = 16;

    66 #ifndef __SYMBIAN32__  

    67   char* buf = _M_alloc(n);

    68 #else

    69   char* buf = NULL;

    70   if(alloc_f!=NULL)

    71   	buf = (char*)_M_alloc_fun(n);

    72   else

    73   	buf = _M_alloc(n);

    74   if(buf)

    75   	*buf = '\0';

    76 #endif 

    77   if (buf) {

    78     setp(buf, buf + n);

    79     setg(buf, buf, buf);

    80   }

    81 }

    82 

    83 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(char* get, streamsize n, char* put)

    84   : _M_alloc_fun(0), _M_free_fun(0),

    85     _M_dynamic(false), _M_frozen(false), _M_constant(false)

    86 #ifdef __SYMBIAN32__

    87     , _pfrozenendsave(NULL)

    88     ,_pgetfrozenendsave( NULL)

    89 #endif     

    90 {

    91   _M_setup(get, put, n);

    92 }

    93 

    94 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put)

    95   : _M_alloc_fun(0), _M_free_fun(0),

    96     _M_dynamic(false), _M_frozen(false), _M_constant(false)

    97 #ifdef __SYMBIAN32__

    98     , _pfrozenendsave(NULL)

    99     ,_pgetfrozenendsave( NULL)

   100 #endif     

   101 {

   102   _M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);

   103 }

   104 

   105 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(unsigned char* get, streamsize n,

   106                            unsigned char* put)

   107   : _M_alloc_fun(0), _M_free_fun(0),

   108     _M_dynamic(false), _M_frozen(false), _M_constant(false)

   109 #ifdef __SYMBIAN32__

   110     , _pfrozenendsave(NULL)

   111     ,_pgetfrozenendsave( NULL)

   112 #endif     

   113 {

   114   _M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);

   115 }

   116 

   117 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(const char* get, streamsize n)

   118   : _M_alloc_fun(0), _M_free_fun(0),

   119     _M_dynamic(false), _M_frozen(false), _M_constant(true)

   120 #ifdef __SYMBIAN32__

   121     , _pfrozenendsave(NULL)

   122     ,_pgetfrozenendsave( NULL)

   123 #endif     

   124 {

   125   _M_setup(__CONST_CAST(char*,get), 0, n);

   126 }

   127 

   128 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(const signed char* get, streamsize n)

   129   : _M_alloc_fun(0), _M_free_fun(0),

   130     _M_dynamic(false), _M_frozen(false), _M_constant(true)

   131 #ifdef __SYMBIAN32__

   132     , _pfrozenendsave(NULL)

   133     ,_pgetfrozenendsave( NULL)

   134 #endif     

   135 {

   136   _M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(signed char*,get)), 0, n);

   137 }

   138 

   139 _STLP_EXP_DECLSPEC strstreambuf::strstreambuf(const unsigned char* get, streamsize n)

   140   : _M_alloc_fun(0), _M_free_fun(0),

   141     _M_dynamic(false), _M_frozen(false), _M_constant(true)

   142 #ifdef __SYMBIAN32__

   143     , _pfrozenendsave(NULL)

   144     ,_pgetfrozenendsave( NULL)

   145 #endif     

   146 {

   147   _M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(unsigned char*,get)), 0, n);

   148 }

   149 

   150 _STLP_EXP_DECLSPEC void strstreambuf::freeze(bool frozenflag)

   151 {

   152 #ifdef __SYMBIAN32__

   153   if (_M_dynamic)

   154   {

   155     //

   156 	if (frozenflag && !_M_frozen)

   157 		{	// disable writing

   158 		_M_frozen = frozenflag;

   159 		_pfrozenendsave = epptr();

   160         _pgetfrozenendsave = pptr();

   161 		setp(pbase(), eback());

   162 		}

   163 	else if (!frozenflag && _M_frozen)

   164 		{	// re-enable writing

   165 		_M_frozen = frozenflag;

   166 		if(_pfrozenendsave != NULL)

   167 		    {

   168 		    setp(pbase(), _pfrozenendsave);

   169 		    setg(pbase(),  pbase(), _pgetfrozenendsave);

   170 		    }

   171 		}

   172   }

   173 #else

   174   if (_M_dynamic)

   175     _M_frozen = frozenflag;

   176 #endif

   177 }

   178 

   179 _STLP_EXP_DECLSPEC char* strstreambuf::str()

   180 {

   181   freeze(true);

   182   return eback();

   183 }

   184 

   185 _STLP_EXP_DECLSPEC int strstreambuf::pcount() const

   186 {

   187   return int(pptr() ? pptr() - pbase() : 0);

   188 }

   189 

   190 _STLP_EXP_DECLSPEC strstreambuf::int_type strstreambuf::overflow(int_type c) {

   191   if (c == traits_type::eof())

   192     return traits_type::not_eof(c);

   193 #ifdef __SYMBIAN32__

   194   if (pptr() != 0 && pptr() < epptr())

   195   {

   196     *pptr() = c;

   197     pbump(1);

   198     return c;

   199   }

   200   if (!_M_dynamic || _M_constant || _M_frozen)

   201   	return (EOF);	// can't extend

   202 #endif

   203   // Try to expand the buffer.

   204   if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) {

   205     ptrdiff_t old_size = epptr() - pbase();

   206     ptrdiff_t new_size = (max)(2 * old_size, ptrdiff_t(1));

   207 

   208     char* buf = _M_alloc(new_size);

   209     if (buf) {

   210       memcpy(buf, pbase(), old_size);

   211 

   212       char* old_buffer = pbase();

   213       bool reposition_get = false;

   214       ptrdiff_t old_get_offset;

   215       if (gptr() != 0) {

   216         reposition_get = true;

   217         old_get_offset = gptr() - eback();

   218       }

   219 

   220       setp(buf, buf + new_size);

   221       pbump((int)old_size);

   222 

   223       if (reposition_get) 

   224         setg(buf, buf + old_get_offset, buf + (max)(old_get_offset, old_size));

   225 

   226       _M_free(old_buffer);

   227     }

   228   }

   229 

   230   if (pptr() != epptr()) {

   231     *pptr() = c;

   232     pbump(1);

   233     return c;

   234   }

   235   else

   236     return traits_type::eof();

   237 }

   238 

   239 _STLP_EXP_DECLSPEC strstreambuf::int_type strstreambuf::pbackfail(int_type c)

   240 {

   241   if (gptr() != eback()) {

   242     if (c == _Traits::eof()) {

   243       gbump(-1);

   244       return _Traits::not_eof(c);

   245     }

   246     else if (c == gptr()[-1]) {

   247       gbump(-1);

   248       return c;

   249     }

   250     else if (!_M_constant) {

   251       gbump(-1);

   252       *gptr() = c;

   253       return c;

   254     }

   255   }

   256 

   257   return _Traits::eof();

   258 }

   259 

   260 _STLP_EXP_DECLSPEC strstreambuf::int_type strstreambuf::underflow()

   261 {

   262   if (gptr() == egptr() && pptr() && pptr() > egptr())

   263     setg(eback(), gptr(), pptr());

   264 

   265   if (gptr() != egptr())

   266     return (unsigned char) *gptr();

   267   else

   268     return _Traits::eof();

   269 }

   270 

   271 _STLP_EXP_DECLSPEC basic_streambuf<char, char_traits<char> >* 

   272 strstreambuf::setbuf(char*, streamsize)

   273 {

   274   return this;

   275 }

   276 

   277 _STLP_EXP_DECLSPEC strstreambuf::pos_type

   278 strstreambuf::seekoff(off_type off,

   279                       ios_base::seekdir dir, ios_base::openmode mode)

   280 {

   281   bool do_get = false;

   282   bool do_put = false;

   283 

   284   if ((mode & (ios_base::in | ios_base::out)) ==

   285           (ios_base::in | ios_base::out) &&

   286       (dir == ios_base::beg || dir == ios_base::end))

   287     do_get = do_put = true;

   288   else if (mode & ios_base::in)

   289     do_get = true;

   290   else if (mode & ios_base::out)

   291     do_put = true;

   292 

   293   // !gptr() is here because, according to D.7.1 paragraph 4, the seekable

   294   // area is undefined if there is no get area.

   295   if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr())

   296     return pos_type(off_type(-1));

   297 

   298   char* seeklow  = eback();

   299   char* seekhigh = epptr() ? epptr() : egptr();

   300 

   301   off_type newoff;

   302   switch(dir) {

   303   case ios_base::beg:

   304     newoff = 0;

   305     break;

   306   case ios_base::end:

   307     newoff = seekhigh - seeklow;

   308     break;

   309   case ios_base::cur:

   310     newoff = do_put ? pptr() - seeklow : gptr() - seeklow;

   311     break;

   312   default:

   313     return pos_type(off_type(-1));

   314   }

   315 

   316   off += newoff;

   317   if (off < 0 || off > seekhigh - seeklow)

   318     return pos_type(off_type(-1));

   319 

   320   if (do_put) {

   321     if (seeklow + off < pbase()) {

   322       setp(seeklow, epptr());

   323       pbump((int)off);

   324     }

   325     else {

   326       setp(pbase(), epptr());

   327       pbump((int)(off - (pbase() - seeklow)));

   328     }

   329   }

   330   if (do_get) {

   331     if (off <= egptr() - seeklow)

   332       setg(seeklow, seeklow + off, egptr());

   333     else if (off <= pptr() - seeklow)

   334       setg(seeklow, seeklow + off, pptr());

   335     else

   336       setg(seeklow, seeklow + off, epptr());

   337   }

   338 #ifndef __SYMBIAN32__

   339   return pos_type(newoff);

   340 #else

   341   return pos_type(off);

   342 #endif  

   343 }

   344 

   345 _STLP_EXP_DECLSPEC strstreambuf::pos_type

   346 strstreambuf::seekpos(pos_type pos, ios_base::openmode mode)

   347 {

   348   return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode);

   349 }

   350 

   351 

   352 char* strstreambuf::_M_alloc(size_t n)

   353 {

   354   if (_M_alloc_fun)

   355     return __STATIC_CAST(char*,_M_alloc_fun(n));

   356   else

   357     return new char[n];

   358 }

   359 

   360 void strstreambuf::_M_setup(char* get, char* put, streamsize n)

   361 {

   362   if (get) {

   363     size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX);

   364     

   365     if (put) {

   366       if(put == get)

   367         setg(get, get, put + N);

   368       else

   369 #ifndef __SYMBIAN32__      

   370       	setg(get, get, put);      

   371       	setp(put, put + N);

   372 #else

   373 		setg(get, get, put + N-(put-get));      

   374 		setp(put, put + N-(put-get));

   375 #endif      	

   376     }

   377     else {

   378       setg(get, get, get + N);

   379     }

   380   }

   381 }

   382 

   383 //----------------------------------------------------------------------

   384 // Class istrstream

   385 

   386 _STLP_EXP_DECLSPEC istrstream::istrstream(char* s)

   387   : basic_istream<char, char_traits<char> >(0), _M_buf(s, 0)

   388 {

   389   this->init(&_M_buf);

   390 }

   391 

   392 _STLP_EXP_DECLSPEC istrstream::istrstream(const char* s)

   393   : basic_istream<char, char_traits<char> >(0), _M_buf(s, 0)

   394 {

   395   this->init(&_M_buf);

   396 }

   397 

   398 _STLP_EXP_DECLSPEC istrstream::istrstream(char* s, streamsize n)

   399   : basic_istream<char, char_traits<char> >(0), _M_buf(s, n)

   400 {

   401   this->init(&_M_buf);

   402 }

   403 

   404 _STLP_EXP_DECLSPEC istrstream::istrstream(const char* s, streamsize n)

   405   : basic_istream<char, char_traits<char> >(0), _M_buf(s, n)

   406 {

   407   this->init(&_M_buf);

   408 }

   409 

   410 _STLP_EXP_DECLSPEC istrstream::~istrstream() {}

   411 

   412 _STLP_EXP_DECLSPEC strstreambuf* istrstream::rdbuf() const {

   413   return __CONST_CAST(strstreambuf*,&_M_buf);

   414 }

   415 

   416 _STLP_EXP_DECLSPEC char* istrstream::str() { return _M_buf.str(); }

   417 

   418 //----------------------------------------------------------------------

   419 // Class ostrstream

   420 

   421 _STLP_EXP_DECLSPEC ostrstream::ostrstream()

   422   : basic_ostream<char, char_traits<char> >(0), _M_buf()

   423 {

   424   basic_ios<char, char_traits<char> >::init(&_M_buf);

   425 }

   426 

   427 _STLP_EXP_DECLSPEC ostrstream::ostrstream(char* s, int n, ios_base::openmode mode)

   428   : basic_ostream<char, char_traits<char> >(0), 

   429     _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)

   430 {

   431   basic_ios<char, char_traits<char> >::init(&_M_buf);

   432 }

   433 

   434 _STLP_EXP_DECLSPEC ostrstream::~ostrstream() {}

   435 

   436 _STLP_EXP_DECLSPEC strstreambuf* ostrstream::rdbuf() const 

   437 {

   438   return __CONST_CAST(strstreambuf*,&_M_buf);

   439 }

   440 

   441 _STLP_EXP_DECLSPEC void ostrstream::freeze(bool freezeflag)

   442 {

   443   _M_buf.freeze(freezeflag);

   444 }

   445 

   446 _STLP_EXP_DECLSPEC char* ostrstream::str()

   447 {

   448   return _M_buf.str();

   449 }

   450 

   451 _STLP_EXP_DECLSPEC int ostrstream::pcount() const

   452 {

   453   return _M_buf.pcount();

   454 }

   455 

   456 

   457 //----------------------------------------------------------------------

   458 // Class strstream

   459 

   460 _STLP_EXP_DECLSPEC strstream::strstream()

   461   : basic_iostream<char, char_traits<char> >(0), _M_buf()

   462 {

   463   basic_ios<char, char_traits<char> >::init(&_M_buf);

   464 }

   465 

   466 _STLP_EXP_DECLSPEC strstream::strstream(char* s, int n, ios_base::openmode mode)

   467   : basic_iostream<char, char_traits<char> >(0), 

   468     _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)

   469 {

   470   basic_ios<char, char_traits<char> >::init(&_M_buf);

   471 }

   472   

   473 _STLP_EXP_DECLSPEC strstream::~strstream() {}

   474 

   475 _STLP_EXP_DECLSPEC strstreambuf* strstream::rdbuf() const

   476 {

   477   return __CONST_CAST(strstreambuf*,&_M_buf);

   478 }

   479 

   480 _STLP_EXP_DECLSPEC void strstream::freeze(bool freezeflag)

   481 {

   482   _M_buf.freeze(freezeflag);

   483 }

   484 

   485 _STLP_EXP_DECLSPEC int strstream::pcount() const

   486 {

   487   return _M_buf.pcount();

   488 }

   489 

   490 _STLP_EXP_DECLSPEC char* strstream::str()

   491 {

   492   return _M_buf.str();

   493 }

   494 

   495 _STLP_END_NAMESPACE

   496 

   497 // Local Variables:

   498 // mode:C++

   499 // End:
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