comparison: sources/mystring.cpp
sources/mystring.cpp
- changeset 148
- 19e98695e584
- parent 147
- 12c93c4a137c
- child 149
- 7643c21d546b
equal
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inserted
replaced
| 147:12c93c4a137c | 148:19e98695e584 |
|---|---|
| 374 this->vsprintf (formatString, args); | 374 this->vsprintf (formatString, args); |
| 375 va_end (args); | 375 va_end (args); |
| 376 } | 376 } |
| 377 | 377 |
| 378 /*! | 378 /*! |
| 379 * \brief Formats this string using \c vsnprintf, using the provided arguments. The buffer string will be repeatedly | 379 * \brief Formats this string using \c vsnprintf, using the provided arguments. |
| 380 * allocated larger and larger until \c vsnprintf succeeds. | |
| 381 * \param formatString Template string to use with formatting. | 380 * \param formatString Template string to use with formatting. |
| 382 * \param args Variadic arguments to use with formatting. | 381 * \param args Variadic arguments to use with formatting. |
| 383 */ | 382 */ |
| 384 void String::vsprintf (const char* formatString, va_list args) | 383 void String::vsprintf (const char* formatString, va_list args) |
| 385 { | 384 { |
| 386 char* buf = nullptr; | 385 // Copy the argument list so that we have something to provide to vsnprintf in case we have to call it again. |
| 387 int bufsize = 256; | 386 va_list argsCopy; |
| 388 | 387 va_copy(argsCopy, args); |
| 389 do | 388 |
| 390 { | 389 // First, attempt to format using a fixed-size buffer. |
| 391 bufsize *= 2; | 390 static char buffer[64]; |
| 392 delete[] buf; | 391 size_t length = vsnprintf(buffer, sizeof buffer, formatString, args); |
| 393 buf = new char[bufsize]; | 392 |
| 394 } | 393 if (length < sizeof buffer) |
| 395 while (vsnprintf (buf, bufsize, formatString, args) >= bufsize); | 394 { |
| 396 | 395 // vsnprintf succeeded in fitting the formatted string into the buffer, so we're done. |
| 397 m_string = buf; | 396 m_string = buffer; |
| 398 delete[] buf; | 397 } |
| 398 else | |
| 399 { | |
| 400 // vsnprintf needs more space, so we have to allocate a new buffer and try again. | |
| 401 Vector<char> newBuffer(length + 1); | |
| 402 vsnprintf(newBuffer.data(), length + 1, formatString, argsCopy); | |
| 403 m_string = newBuffer; | |
| 404 } | |
| 399 } | 405 } |
| 400 | 406 |
| 401 /*! | 407 /*! |
| 402 * \brief Joins the elements of this string list into one longer string. | 408 * \brief Joins the elements of this string list into one longer string. |
| 403 * \param delimeter The delimeter to place between the element strings. | 409 * \param delimeter The delimeter to place between the element strings. |
