Converts a wide string to a narrow string in UTF-8 encoding. The wide string is assumed to have the following encoding: UTF-16 if sizeof(wchar_t) == 2 (on Windows, Cygwin, Symbian OS) UTF-32 if sizeof(wchar_t) == 4 (on Linux) Parameter str points to a null-terminated wide string. Parameter num_chars may additionally limit the number of wchar_t characters processed. -1 is used when the entire strin
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