| 251 | } |
| 252 | |
| 253 | static JSONCPP_STRING valueToQuotedStringN(const char* value, unsigned length) { |
| 254 | if (value == NULL) |
| 255 | return ""; |
| 256 | |
| 257 | if (!isAnyCharRequiredQuoting(value, length)) |
| 258 | return JSONCPP_STRING("\"") + value + "\""; |
| 259 | // We have to walk value and escape any special characters. |
| 260 | // Appending to JSONCPP_STRING is not efficient, but this should be rare. |
| 261 | // (Note: forward slashes are *not* rare, but I am not escaping them.) |
| 262 | JSONCPP_STRING::size_type maxsize = |
| 263 | length * 2 + 3; // allescaped+quotes+NULL |
| 264 | JSONCPP_STRING result; |
| 265 | result.reserve(maxsize); // to avoid lots of mallocs |
| 266 | result += "\""; |
| 267 | char const* end = value + length; |
| 268 | for (const char* c = value; c != end; ++c) { |
| 269 | switch (*c) { |
| 270 | case '\"': |
| 271 | result += "\\\""; |
| 272 | break; |
| 273 | case '\\': |
| 274 | result += "\\\\"; |
| 275 | break; |
| 276 | case '\b': |
| 277 | result += "\\b"; |
| 278 | break; |
| 279 | case '\f': |
| 280 | result += "\\f"; |
| 281 | break; |
| 282 | case '\n': |
| 283 | result += "\\n"; |
| 284 | break; |
| 285 | case '\r': |
| 286 | result += "\\r"; |
| 287 | break; |
| 288 | case '\t': |
| 289 | result += "\\t"; |
| 290 | break; |
| 291 | // case '/': |
| 292 | // Even though \/ is considered a legal escape in JSON, a bare |
| 293 | // slash is also legal, so I see no reason to escape it. |
| 294 | // (I hope I am not misunderstanding something.) |
| 295 | // blep notes: actually escaping \/ may be useful in javascript to avoid </ |
| 296 | // sequence. |
| 297 | // Should add a flag to allow this compatibility mode and prevent this |
| 298 | // sequence from occurring. |
| 299 | default: { |
| 300 | unsigned int cp = utf8ToCodepoint(c, end); |
| 301 | // don't escape non-control characters |
| 302 | // (short escape sequence are applied above) |
| 303 | if (cp < 0x80 && cp >= 0x20) |
| 304 | result += static_cast<char>(cp); |
| 305 | else if (cp < 0x10000) { // codepoint is in Basic Multilingual Plane |
| 306 | result += "\\u"; |
| 307 | result += toHex16Bit(cp); |
| 308 | } |
| 309 | else { // codepoint is not in Basic Multilingual Plane |
| 310 | // convert to surrogate pair first |
no test coverage detected