Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 1 | //===------------------------ strstream.cpp -------------------------------===// |
| 2 | // |
Howard Hinnant | f5256e1 | 2010-05-11 21:36:01 +0000 | [diff] [blame^] | 3 | // The LLVM Compiler Infrastructure |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "strstream" |
| 11 | #include "algorithm" |
| 12 | #include "climits" |
| 13 | #include "cstring" |
| 14 | |
| 15 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 16 | |
| 17 | strstreambuf::strstreambuf(streamsize __alsize) |
| 18 | : __strmode_(__dynamic), |
| 19 | __alsize_(__alsize), |
| 20 | __palloc_(nullptr), |
| 21 | __pfree_(nullptr) |
| 22 | { |
| 23 | } |
| 24 | |
| 25 | strstreambuf::strstreambuf(void* (*__palloc)(size_t), void (*__pfree)(void*)) |
| 26 | : __strmode_(__dynamic), |
| 27 | __alsize_(__default_alsize), |
| 28 | __palloc_(__palloc), |
| 29 | __pfree_(__pfree) |
| 30 | { |
| 31 | } |
| 32 | |
| 33 | void |
| 34 | strstreambuf::__init(char* __gnext, streamsize __n, char* __pbeg) |
| 35 | { |
| 36 | if (__n == 0) |
| 37 | __n = strlen(__gnext); |
| 38 | else if (__n < 0) |
| 39 | __n = INT_MAX; |
| 40 | if (__pbeg == nullptr) |
| 41 | setg(__gnext, __gnext, __gnext + __n); |
| 42 | else |
| 43 | { |
| 44 | setg(__gnext, __gnext, __pbeg); |
| 45 | setp(__pbeg, __pbeg + __n); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | strstreambuf::strstreambuf(char* __gnext, streamsize __n, char* __pbeg) |
| 50 | : __strmode_(), |
| 51 | __alsize_(__default_alsize), |
| 52 | __palloc_(nullptr), |
| 53 | __pfree_(nullptr) |
| 54 | { |
| 55 | __init(__gnext, __n, __pbeg); |
| 56 | } |
| 57 | |
| 58 | strstreambuf::strstreambuf(const char* __gnext, streamsize __n) |
| 59 | : __strmode_(__constant), |
| 60 | __alsize_(__default_alsize), |
| 61 | __palloc_(nullptr), |
| 62 | __pfree_(nullptr) |
| 63 | { |
| 64 | __init((char*)__gnext, __n, nullptr); |
| 65 | } |
| 66 | |
| 67 | strstreambuf::strstreambuf(signed char* __gnext, streamsize __n, signed char* __pbeg) |
| 68 | : __strmode_(), |
| 69 | __alsize_(__default_alsize), |
| 70 | __palloc_(nullptr), |
| 71 | __pfree_(nullptr) |
| 72 | { |
| 73 | __init((char*)__gnext, __n, (char*)__pbeg); |
| 74 | } |
| 75 | |
| 76 | strstreambuf::strstreambuf(const signed char* __gnext, streamsize __n) |
| 77 | : __strmode_(__constant), |
| 78 | __alsize_(__default_alsize), |
| 79 | __palloc_(nullptr), |
| 80 | __pfree_(nullptr) |
| 81 | { |
| 82 | __init((char*)__gnext, __n, nullptr); |
| 83 | } |
| 84 | |
| 85 | strstreambuf::strstreambuf(unsigned char* __gnext, streamsize __n, unsigned char* __pbeg) |
| 86 | : __strmode_(), |
| 87 | __alsize_(__default_alsize), |
| 88 | __palloc_(nullptr), |
| 89 | __pfree_(nullptr) |
| 90 | { |
| 91 | __init((char*)__gnext, __n, (char*)__pbeg); |
| 92 | } |
| 93 | |
| 94 | strstreambuf::strstreambuf(const unsigned char* __gnext, streamsize __n) |
| 95 | : __strmode_(__constant), |
| 96 | __alsize_(__default_alsize), |
| 97 | __palloc_(nullptr), |
| 98 | __pfree_(nullptr) |
| 99 | { |
| 100 | __init((char*)__gnext, __n, nullptr); |
| 101 | } |
| 102 | |
| 103 | #ifdef _LIBCPP_MOVE |
| 104 | |
| 105 | strstreambuf::strstreambuf(strstreambuf&& __rhs) |
| 106 | : streambuf(__rhs), |
| 107 | __strmode_(__rhs.__strmode_), |
| 108 | __alsize_(__rhs.__alsize_), |
| 109 | __palloc_(__rhs.__palloc_), |
| 110 | __pfree_(__rhs.__pfree_) |
| 111 | { |
| 112 | __rhs.setg(nullptr, nullptr, nullptr); |
| 113 | __rhs.setp(nullptr, nullptr); |
| 114 | } |
| 115 | |
| 116 | strstreambuf& |
| 117 | strstreambuf::operator=(strstreambuf&& __rhs) |
| 118 | { |
| 119 | if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0) |
| 120 | { |
| 121 | if (__pfree_) |
| 122 | __pfree_(eback()); |
| 123 | else |
| 124 | delete [] eback(); |
| 125 | } |
| 126 | streambuf::operator=(__rhs); |
| 127 | __strmode_ = __rhs.__strmode_; |
| 128 | __alsize_ = __rhs.__alsize_; |
| 129 | __palloc_ = __rhs.__palloc_; |
| 130 | __pfree_ = __rhs.__pfree_; |
| 131 | __rhs.setg(nullptr, nullptr, nullptr); |
| 132 | __rhs.setp(nullptr, nullptr); |
| 133 | } |
| 134 | |
| 135 | #endif |
| 136 | |
| 137 | strstreambuf::~strstreambuf() |
| 138 | { |
| 139 | if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0) |
| 140 | { |
| 141 | if (__pfree_) |
| 142 | __pfree_(eback()); |
| 143 | else |
| 144 | delete [] eback(); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | void |
| 149 | strstreambuf::swap(strstreambuf& __rhs) |
| 150 | { |
| 151 | streambuf::swap(__rhs); |
| 152 | _STD::swap(__strmode_, __rhs.__strmode_); |
| 153 | _STD::swap(__alsize_, __rhs.__alsize_); |
| 154 | _STD::swap(__palloc_, __rhs.__palloc_); |
| 155 | _STD::swap(__pfree_, __rhs.__pfree_); |
| 156 | } |
| 157 | |
| 158 | void |
| 159 | strstreambuf::freeze(bool __freezefl) |
| 160 | { |
| 161 | if (__strmode_ & __dynamic) |
| 162 | { |
| 163 | if (__freezefl) |
| 164 | __strmode_ |= __frozen; |
| 165 | else |
| 166 | __strmode_ &= ~__frozen; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | char* |
| 171 | strstreambuf::str() |
| 172 | { |
| 173 | if (__strmode_ & __dynamic) |
| 174 | __strmode_ |= __frozen; |
| 175 | return eback(); |
| 176 | } |
| 177 | |
| 178 | int |
| 179 | strstreambuf::pcount() const |
| 180 | { |
| 181 | return static_cast<int>(pptr() - pbase()); |
| 182 | } |
| 183 | |
| 184 | strstreambuf::int_type |
| 185 | strstreambuf::overflow(int_type __c) |
| 186 | { |
| 187 | if (__c == EOF) |
| 188 | return int_type(0); |
| 189 | if (pptr() == epptr()) |
| 190 | { |
| 191 | if ((__strmode_ & __dynamic) == 0 || (__strmode_ & __frozen) != 0) |
| 192 | return int_type(EOF); |
| 193 | streamsize old_size = (epptr() ? epptr() : egptr()) - eback(); |
| 194 | streamsize new_size = max<streamsize>(__alsize_, 2*old_size); |
| 195 | char* buf = nullptr; |
| 196 | if (__palloc_) |
| 197 | buf = static_cast<char*>(__palloc_(new_size)); |
| 198 | else |
| 199 | buf = new char[new_size]; |
| 200 | if (buf == nullptr) |
| 201 | return int_type(EOF); |
| 202 | memcpy(buf, eback(), old_size); |
| 203 | ptrdiff_t ninp = gptr() - eback(); |
| 204 | ptrdiff_t einp = egptr() - eback(); |
| 205 | ptrdiff_t nout = pptr() - pbase(); |
| 206 | ptrdiff_t eout = epptr() - pbase(); |
| 207 | if (__strmode_ & __allocated) |
| 208 | { |
| 209 | if (__pfree_) |
| 210 | __pfree_(eback()); |
| 211 | else |
| 212 | delete [] eback(); |
| 213 | } |
| 214 | setg(buf, buf + ninp, buf + einp); |
| 215 | setp(buf + einp, buf + einp + eout); |
| 216 | pbump(nout); |
| 217 | __strmode_ |= __allocated; |
| 218 | } |
| 219 | *pptr() = static_cast<char>(__c); |
| 220 | pbump(1); |
| 221 | return int_type((unsigned char)__c); |
| 222 | } |
| 223 | |
| 224 | strstreambuf::int_type |
| 225 | strstreambuf::pbackfail(int_type __c) |
| 226 | { |
| 227 | if (eback() == gptr()) |
| 228 | return EOF; |
| 229 | if (__c == EOF) |
| 230 | { |
| 231 | gbump(-1); |
| 232 | return int_type(0); |
| 233 | } |
| 234 | if (__strmode_ & __constant) |
| 235 | { |
| 236 | if (gptr()[-1] == static_cast<char>(__c)) |
| 237 | { |
| 238 | gbump(-1); |
| 239 | return __c; |
| 240 | } |
| 241 | return EOF; |
| 242 | } |
| 243 | gbump(-1); |
| 244 | *gptr() = static_cast<char>(__c); |
| 245 | return __c; |
| 246 | } |
| 247 | |
| 248 | strstreambuf::int_type |
| 249 | strstreambuf::underflow() |
| 250 | { |
| 251 | if (gptr() == egptr()) |
| 252 | { |
| 253 | if (egptr() >= pptr()) |
| 254 | return EOF; |
| 255 | setg(eback(), gptr(), pptr()); |
| 256 | } |
| 257 | return int_type((unsigned char)*gptr()); |
| 258 | } |
| 259 | |
| 260 | |
| 261 | strstreambuf::pos_type |
| 262 | strstreambuf::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __which) |
| 263 | { |
| 264 | off_type __p(-1); |
| 265 | bool pos_in = __which & ios::in; |
| 266 | bool pos_out = __which & ios::out; |
| 267 | bool legal = false; |
| 268 | switch (__way) |
| 269 | { |
| 270 | case ios::beg: |
| 271 | case ios::end: |
| 272 | if (pos_in || pos_out) |
| 273 | legal = true; |
| 274 | break; |
| 275 | case ios::cur: |
| 276 | if (pos_in != pos_out) |
| 277 | legal = true; |
| 278 | break; |
| 279 | } |
| 280 | if (pos_in && gptr() == nullptr) |
| 281 | legal = false; |
| 282 | if (pos_out && pptr() == nullptr) |
| 283 | legal = false; |
| 284 | if (legal) |
| 285 | { |
| 286 | off_type newoff; |
| 287 | char* seekhigh = epptr() ? epptr() : egptr(); |
| 288 | switch (__way) |
| 289 | { |
| 290 | case ios::beg: |
| 291 | newoff = 0; |
| 292 | break; |
| 293 | case ios::cur: |
| 294 | newoff = (pos_in ? gptr() : pptr()) - eback(); |
| 295 | break; |
| 296 | case ios::end: |
| 297 | newoff = seekhigh - eback(); |
| 298 | break; |
| 299 | } |
| 300 | newoff += __off; |
| 301 | if (0 <= newoff && newoff <= seekhigh - eback()) |
| 302 | { |
| 303 | char* newpos = eback() + newoff; |
| 304 | if (pos_in) |
| 305 | setg(eback(), newpos, max(newpos, egptr())); |
| 306 | if (pos_out) |
| 307 | { |
| 308 | // min(pbase, newpos), newpos, epptr() |
| 309 | __off = epptr() - newpos; |
| 310 | setp(min(pbase(), newpos), epptr()); |
| 311 | pbump(static_cast<int>((epptr() - pbase()) - __off)); |
| 312 | } |
| 313 | __p = newoff; |
| 314 | } |
| 315 | } |
| 316 | return pos_type(__p); |
| 317 | } |
| 318 | |
| 319 | |
| 320 | strstreambuf::pos_type |
| 321 | strstreambuf::seekpos(pos_type __sp, ios_base::openmode __which) |
| 322 | { |
| 323 | off_type __p(-1); |
| 324 | bool pos_in = __which & ios::in; |
| 325 | bool pos_out = __which & ios::out; |
| 326 | if (pos_in || pos_out) |
| 327 | { |
| 328 | if (!((pos_in && gptr() == nullptr) || (pos_out && pptr() == nullptr))) |
| 329 | { |
| 330 | off_type newoff = __sp; |
| 331 | char* seekhigh = epptr() ? epptr() : egptr(); |
| 332 | if (0 <= newoff && newoff <= seekhigh - eback()) |
| 333 | { |
| 334 | char* newpos = eback() + newoff; |
| 335 | if (pos_in) |
| 336 | setg(eback(), newpos, max(newpos, egptr())); |
| 337 | if (pos_out) |
| 338 | { |
| 339 | // min(pbase, newpos), newpos, epptr() |
| 340 | off_type temp = epptr() - newpos; |
| 341 | setp(min(pbase(), newpos), epptr()); |
| 342 | pbump(static_cast<int>((epptr() - pbase()) - temp)); |
| 343 | } |
| 344 | __p = newoff; |
| 345 | } |
| 346 | } |
| 347 | } |
| 348 | return pos_type(__p); |
| 349 | } |
| 350 | |
| 351 | istrstream::~istrstream() |
| 352 | { |
| 353 | } |
| 354 | |
| 355 | ostrstream::~ostrstream() |
| 356 | { |
| 357 | } |
| 358 | |
| 359 | strstream::~strstream() |
| 360 | { |
| 361 | } |
| 362 | |
| 363 | _LIBCPP_END_NAMESPACE_STD |