Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | /* This is part of libio/iostream, providing -*- C++ -*- input/output. |
| 2 | Copyright (C) 2000 Free Software Foundation |
| 3 | |
| 4 | This file is part of the GNU IO Library. This library is free |
| 5 | software; you can redistribute it and/or modify it under the |
| 6 | terms of the GNU General Public License as published by the |
| 7 | Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this library; see the file COPYING. If not, write to the Free |
| 17 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | |
| 19 | As a special exception, if you link this library with files |
| 20 | compiled with a GNU compiler to produce an executable, this does not cause |
| 21 | the resulting executable to be covered by the GNU General Public License. |
| 22 | This exception does not however invalidate any other reasons why |
| 23 | the executable file might be covered by the GNU General Public License. */ |
| 24 | |
| 25 | /* Written by Magnus Fromreide (magfr@lysator.liu.se). */ |
| 26 | /* seekoff and ideas for overflow is largely borrowed from libstdc++-v3 */ |
| 27 | |
| 28 | #ifndef __SSTREAM__ |
| 29 | #define __SSTREAM__ |
| 30 | |
| 31 | #include <iostream.h> |
| 32 | #include <streambuf.h> |
| 33 | #include <string> |
| 34 | |
| 35 | namespace std |
| 36 | { |
| 37 | class stringbuf : public streambuf |
| 38 | { |
| 39 | public: |
| 40 | typedef char char_type; |
| 41 | typedef int int_type; |
| 42 | typedef streampos pos_type; |
| 43 | typedef streamoff off_type; |
| 44 | |
| 45 | explicit |
| 46 | stringbuf(int which=ios::in|ios::out) |
| 47 | : streambuf(), mode(static_cast<ios::open_mode>(which)), |
| 48 | stream(NULL), stream_len(0) |
| 49 | { |
| 50 | stringbuf_init(); |
| 51 | } |
| 52 | |
| 53 | explicit |
| 54 | stringbuf(const string &str, int which=ios::in|ios::out) |
| 55 | : streambuf(), mode(static_cast<ios::open_mode>(which)), |
| 56 | stream(NULL), stream_len(0) |
| 57 | { |
| 58 | if (mode & (ios::in|ios::out)) |
| 59 | { |
| 60 | stream_len = str.size(); |
| 61 | stream = new char_type[stream_len]; |
| 62 | str.copy(stream, stream_len); |
| 63 | } |
| 64 | stringbuf_init(); |
| 65 | } |
| 66 | |
| 67 | virtual |
| 68 | ~stringbuf() |
| 69 | { |
| 70 | delete[] stream; |
| 71 | } |
| 72 | |
| 73 | string |
| 74 | str() const |
| 75 | { |
| 76 | if (pbase() != 0) |
| 77 | return string(stream, pptr()-pbase()); |
| 78 | else |
| 79 | return string(); |
| 80 | } |
| 81 | |
| 82 | void |
| 83 | str(const string& str) |
| 84 | { |
| 85 | delete[] stream; |
| 86 | stream_len = str.size(); |
| 87 | stream = new char_type[stream_len]; |
| 88 | str.copy(stream, stream_len); |
| 89 | stringbuf_init(); |
| 90 | } |
| 91 | |
| 92 | protected: |
| 93 | // The buffer is already in gptr, so if it ends then it is out of data. |
| 94 | virtual int |
| 95 | underflow() |
| 96 | { |
| 97 | return EOF; |
| 98 | } |
| 99 | |
| 100 | virtual int |
| 101 | overflow(int c = EOF) |
| 102 | { |
| 103 | int res; |
| 104 | if (mode & ios::out) |
| 105 | { |
| 106 | if (c != EOF) |
| 107 | { |
| 108 | streamsize old_stream_len = stream_len; |
| 109 | stream_len += 1; |
| 110 | char_type* new_stream = new char_type[stream_len]; |
| 111 | memcpy(new_stream, stream, old_stream_len); |
| 112 | delete[] stream; |
| 113 | stream = new_stream; |
| 114 | stringbuf_sync(gptr()-eback(), pptr()-pbase()); |
| 115 | sputc(c); |
| 116 | res = c; |
| 117 | } |
| 118 | else |
| 119 | res = EOF; |
| 120 | } |
| 121 | else |
| 122 | res = 0; |
| 123 | return res; |
| 124 | } |
| 125 | |
| 126 | virtual streambuf* |
| 127 | setbuf(char_type* s, streamsize n) |
| 128 | { |
| 129 | if (n != 0) |
| 130 | { |
| 131 | delete[] stream; |
| 132 | stream = new char_type[n]; |
| 133 | memcpy(stream, s, n); |
| 134 | stream_len = n; |
| 135 | stringbuf_sync(0, 0); |
| 136 | } |
| 137 | return this; |
| 138 | } |
| 139 | |
| 140 | virtual pos_type |
| 141 | seekoff(off_type off, ios::seek_dir way, int which = ios::in | ios::out) |
| 142 | { |
| 143 | pos_type ret = pos_type(off_type(-1)); |
| 144 | bool testin = which & ios::in && mode & ios::in; |
| 145 | bool testout = which & ios::out && mode & ios::out; |
| 146 | bool testboth = testin && testout && way != ios::cur; |
| 147 | |
| 148 | if (stream_len && ((testin != testout) || testboth)) |
| 149 | { |
| 150 | char_type* beg = stream; |
| 151 | char_type* curi = NULL; |
| 152 | char_type* curo = NULL; |
| 153 | char_type* endi = NULL; |
| 154 | char_type* endo = NULL; |
| 155 | |
| 156 | if (testin) |
| 157 | { |
| 158 | curi = gptr(); |
| 159 | endi = egptr(); |
| 160 | } |
| 161 | if (testout) |
| 162 | { |
| 163 | curo = pptr(); |
| 164 | endo = epptr(); |
| 165 | } |
| 166 | |
| 167 | off_type newoffi = 0; |
| 168 | off_type newoffo = 0; |
| 169 | if (way == ios::beg) |
| 170 | { |
| 171 | newoffi = beg - curi; |
| 172 | newoffo = beg - curo; |
| 173 | } |
| 174 | else if (way == ios::end) |
| 175 | { |
| 176 | newoffi = endi - curi; |
| 177 | newoffo = endo - curo; |
| 178 | } |
| 179 | |
| 180 | if (testin && newoffi + off + curi - beg >= 0 && |
| 181 | endi - beg >= newoffi + off + curi - beg) |
| 182 | { |
| 183 | gbump(newoffi + off); |
| 184 | ret = pos_type(newoffi + off + curi); |
| 185 | } |
| 186 | if (testout && newoffo + off + curo - beg >= 0 && |
| 187 | endo - beg >= newoffo + off + curo - beg) |
| 188 | { |
| 189 | pbump(newoffo + off); |
| 190 | ret = pos_type(newoffo + off + curo); |
| 191 | } |
| 192 | } |
| 193 | return ret; |
| 194 | } |
| 195 | |
| 196 | virtual pos_type |
| 197 | seekpos(pos_type sp, int which = ios::in | ios::out) |
| 198 | { |
| 199 | pos_type ret = seekoff(sp, ios::beg, which); |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | private: |
| 204 | void |
| 205 | stringbuf_sync(streamsize i, streamsize o) |
| 206 | { |
| 207 | if (mode & ios::in) |
| 208 | setg(stream, stream + i, stream + stream_len); |
| 209 | if (mode & ios::out) |
| 210 | { |
| 211 | setp(stream, stream + stream_len); |
| 212 | pbump(o); |
| 213 | } |
| 214 | } |
| 215 | void |
| 216 | stringbuf_init() |
| 217 | { |
| 218 | if (mode & ios::ate) |
| 219 | stringbuf_sync(0, stream_len); |
| 220 | else |
| 221 | stringbuf_sync(0, 0); |
| 222 | } |
| 223 | |
| 224 | private: |
| 225 | ios::open_mode mode; |
| 226 | char_type* stream; |
| 227 | streamsize stream_len; |
| 228 | }; |
| 229 | |
| 230 | class istringstream : public istream { |
| 231 | public: |
| 232 | typedef char char_type; |
| 233 | typedef int int_type; |
| 234 | typedef streampos pos_type; |
| 235 | typedef streamoff off_type; |
| 236 | |
| 237 | explicit |
| 238 | istringstream(int which=ios::in) |
| 239 | : istream(&sb), sb(which | ios::in) |
| 240 | { } |
| 241 | |
| 242 | explicit |
| 243 | istringstream(const string& str, int which=ios::in) |
| 244 | : istream(&sb), sb(str, which | ios::in) |
| 245 | { } |
| 246 | |
| 247 | stringbuf* |
| 248 | rdbuf() const |
| 249 | { |
| 250 | return const_cast<stringbuf*>(&sb); |
| 251 | } |
| 252 | |
| 253 | string |
| 254 | str() const |
| 255 | { |
| 256 | return rdbuf()->str(); |
| 257 | } |
| 258 | void |
| 259 | str(const string& s) |
| 260 | { |
| 261 | rdbuf()->str(s); |
| 262 | } |
| 263 | private: |
| 264 | stringbuf sb; |
| 265 | }; |
| 266 | |
| 267 | class ostringstream : public ostream { |
| 268 | public: |
| 269 | typedef char char_type; |
| 270 | typedef int int_type; |
| 271 | typedef streampos pos_type; |
| 272 | typedef streamoff off_type; |
| 273 | |
| 274 | explicit |
| 275 | ostringstream(int which=ios::out) |
| 276 | : ostream(&sb), sb(which | ios::out) |
| 277 | { } |
| 278 | |
| 279 | explicit |
| 280 | ostringstream(const string& str, int which=ios::out) |
| 281 | : ostream(&sb), sb(str, which | ios::out) |
| 282 | { } |
| 283 | |
| 284 | stringbuf* |
| 285 | rdbuf() const |
| 286 | { |
| 287 | return const_cast<stringbuf*>(&sb); |
| 288 | } |
| 289 | |
| 290 | string |
| 291 | str() const |
| 292 | { |
| 293 | return rdbuf()->str(); |
| 294 | } |
| 295 | |
| 296 | void str(const string& s) |
| 297 | { |
| 298 | rdbuf()->str(s); |
| 299 | } |
| 300 | private: |
| 301 | stringbuf sb; |
| 302 | }; |
| 303 | |
| 304 | class stringstream : public iostream { |
| 305 | public: |
| 306 | typedef char char_type; |
| 307 | typedef int int_type; |
| 308 | typedef streampos pos_type; |
| 309 | typedef streamoff off_type; |
| 310 | |
| 311 | explicit |
| 312 | stringstream(int which=ios::out|ios::in) |
| 313 | : iostream(&sb), sb(which) |
| 314 | { } |
| 315 | |
| 316 | explicit |
| 317 | stringstream(const string& str, int which=ios::out|ios::in) |
| 318 | : iostream(&sb), sb(str, which) |
| 319 | { } |
| 320 | |
| 321 | stringbuf* |
| 322 | rdbuf() const |
| 323 | { |
| 324 | return const_cast<stringbuf*>(&sb); |
| 325 | } |
| 326 | |
| 327 | string |
| 328 | str() const |
| 329 | { |
| 330 | return rdbuf()->str(); |
| 331 | } |
| 332 | |
| 333 | void |
| 334 | str(const string& s) |
| 335 | { |
| 336 | rdbuf()->str(s); |
| 337 | } |
| 338 | private: |
| 339 | stringbuf sb; |
| 340 | }; |
| 341 | }; |
| 342 | |
| 343 | #endif /* not __STRSTREAM__ */ |