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Diffstat (limited to 'libstdc++/sstream')
| -rw-r--r-- | libstdc++/sstream | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/libstdc++/sstream b/libstdc++/sstream new file mode 100644 index 00000000000..45393b14761 --- /dev/null +++ b/libstdc++/sstream @@ -0,0 +1,343 @@ +/* This is part of libio/iostream, providing -*- C++ -*- input/output. +Copyright (C) 2000 Free Software Foundation + +This file is part of the GNU IO 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. + +As a special exception, if you link this library with files +compiled with a GNU compiler to produce an executable, this does not cause +the resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why +the executable file might be covered by the GNU General Public License. */ + +/* Written by Magnus Fromreide (magfr@lysator.liu.se). */ +/* seekoff and ideas for overflow is largely borrowed from libstdc++-v3 */ + +#ifndef __SSTREAM__ +#define __SSTREAM__ + +#include <iostream.h> +#include <streambuf.h> +#include <string> + +namespace std +{ + class stringbuf : public streambuf + { + public: + typedef char char_type; + typedef int int_type; + typedef streampos pos_type; + typedef streamoff off_type; + + explicit + stringbuf(int which=ios::in|ios::out) + : streambuf(), mode(static_cast<ios::open_mode>(which)), + stream(NULL), stream_len(0) + { + stringbuf_init(); + } + + explicit + stringbuf(const string &str, int which=ios::in|ios::out) + : streambuf(), mode(static_cast<ios::open_mode>(which)), + stream(NULL), stream_len(0) + { + if (mode & (ios::in|ios::out)) + { + stream_len = str.size(); + stream = new char_type[stream_len]; + str.copy(stream, stream_len); + } + stringbuf_init(); + } + + virtual + ~stringbuf() + { + delete[] stream; + } + + string + str() const + { + if (pbase() != 0) + return string(stream, pptr()-pbase()); + else + return string(); + } + + void + str(const string& str) + { + delete[] stream; + stream_len = str.size(); + stream = new char_type[stream_len]; + str.copy(stream, stream_len); + stringbuf_init(); + } + + protected: + // The buffer is already in gptr, so if it ends then it is out of data. + virtual int + underflow() + { + return EOF; + } + + virtual int + overflow(int c = EOF) + { + int res; + if (mode & ios::out) + { + if (c != EOF) + { + streamsize old_stream_len = stream_len; + stream_len += 1; + char_type* new_stream = new char_type[stream_len]; + memcpy(new_stream, stream, old_stream_len); + delete[] stream; + stream = new_stream; + stringbuf_sync(gptr()-eback(), pptr()-pbase()); + sputc(c); + res = c; + } + else + res = EOF; + } + else + res = 0; + return res; + } + + virtual streambuf* + setbuf(char_type* s, streamsize n) + { + if (n != 0) + { + delete[] stream; + stream = new char_type[n]; + memcpy(stream, s, n); + stream_len = n; + stringbuf_sync(0, 0); + } + return this; + } + + virtual pos_type + seekoff(off_type off, ios::seek_dir way, int which = ios::in | ios::out) + { + pos_type ret = pos_type(off_type(-1)); + bool testin = which & ios::in && mode & ios::in; + bool testout = which & ios::out && mode & ios::out; + bool testboth = testin && testout && way != ios::cur; + + if (stream_len && ((testin != testout) || testboth)) + { + char_type* beg = stream; + char_type* curi = NULL; + char_type* curo = NULL; + char_type* endi = NULL; + char_type* endo = NULL; + + if (testin) + { + curi = gptr(); + endi = egptr(); + } + if (testout) + { + curo = pptr(); + endo = epptr(); + } + + off_type newoffi = 0; + off_type newoffo = 0; + if (way == ios::beg) + { + newoffi = beg - curi; + newoffo = beg - curo; + } + else if (way == ios::end) + { + newoffi = endi - curi; + newoffo = endo - curo; + } + + if (testin && newoffi + off + curi - beg >= 0 && + endi - beg >= newoffi + off + curi - beg) + { + gbump(newoffi + off); + ret = pos_type(newoffi + off + curi); + } + if (testout && newoffo + off + curo - beg >= 0 && + endo - beg >= newoffo + off + curo - beg) + { + pbump(newoffo + off); + ret = pos_type(newoffo + off + curo); + } + } + return ret; + } + + virtual pos_type + seekpos(pos_type sp, int which = ios::in | ios::out) + { + pos_type ret = seekoff(sp, ios::beg, which); + return ret; + } + + private: + void + stringbuf_sync(streamsize i, streamsize o) + { + if (mode & ios::in) + setg(stream, stream + i, stream + stream_len); + if (mode & ios::out) + { + setp(stream, stream + stream_len); + pbump(o); + } + } + void + stringbuf_init() + { + if (mode & ios::ate) + stringbuf_sync(0, stream_len); + else + stringbuf_sync(0, 0); + } + + private: + ios::open_mode mode; + char_type* stream; + streamsize stream_len; + }; + + class istringstream : public istream { + public: + typedef char char_type; + typedef int int_type; + typedef streampos pos_type; + typedef streamoff off_type; + + explicit + istringstream(int which=ios::in) + : istream(&sb), sb(which | ios::in) + { } + + explicit + istringstream(const string& str, int which=ios::in) + : istream(&sb), sb(str, which | ios::in) + { } + + stringbuf* + rdbuf() const + { + return const_cast<stringbuf*>(&sb); + } + + string + str() const + { + return rdbuf()->str(); + } + void + str(const string& s) + { + rdbuf()->str(s); + } + private: + stringbuf sb; + }; + + class ostringstream : public ostream { + public: + typedef char char_type; + typedef int int_type; + typedef streampos pos_type; + typedef streamoff off_type; + + explicit + ostringstream(int which=ios::out) + : ostream(&sb), sb(which | ios::out) + { } + + explicit + ostringstream(const string& str, int which=ios::out) + : ostream(&sb), sb(str, which | ios::out) + { } + + stringbuf* + rdbuf() const + { + return const_cast<stringbuf*>(&sb); + } + + string + str() const + { + return rdbuf()->str(); + } + + void str(const string& s) + { + rdbuf()->str(s); + } + private: + stringbuf sb; + }; + + class stringstream : public iostream { + public: + typedef char char_type; + typedef int int_type; + typedef streampos pos_type; + typedef streamoff off_type; + + explicit + stringstream(int which=ios::out|ios::in) + : iostream(&sb), sb(which) + { } + + explicit + stringstream(const string& str, int which=ios::out|ios::in) + : iostream(&sb), sb(str, which) + { } + + stringbuf* + rdbuf() const + { + return const_cast<stringbuf*>(&sb); + } + + string + str() const + { + return rdbuf()->str(); + } + + void + str(const string& s) + { + rdbuf()->str(s); + } + private: + stringbuf sb; + }; +}; + +#endif /* not __STRSTREAM__ */ |