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sqlite3_str *sqlite3_str_new(sqlite3*);
The sqlite3_str_new(D) interface allocates and initializes a new sqlite3_str object. To avoid memory leaks, the object returned by sqlite3_str_new() must be freed by a subsequent call to sqlite3_str_finish(X).
The sqlite3_str_new(D) interface always returns a pointer to a valid sqlite3_str object, though in the event of an out-of-memory error the returned object might be a special singleton that will silently reject new text, always return SQLITE_NOMEM from sqlite3_str_errcode(), always return 0 for sqlite3_str_length(), and always return NULL from sqlite3_str_finish(X). It is always safe to use the value returned by sqlite3_str_new(D) as the sqlite3_str parameter to any of the other sqlite3_str methods.
The D parameter to sqlite3_str_new(D) may be NULL. If the D parameter in sqlite3_str_new(D) is not NULL, then the maximum length of the string contained in the sqlite3_str object will be the value set for sqlite3_limit(D,SQLITE_LIMIT_LENGTH) instead of SQLITE_MAX_LENGTH.