说明:弦乐
size_t len;
char *dup = strduplen( " Hello World!, Привет мир! " , &len);
size_t len8;
bool is_valid_utf8 = utf8validate(dup, NULL , &len8);
printf ( " %zu , %zu \n utf8_valid: %s , len= %zu \n " , len, utf8len(dup, NULL ), is_valid_utf8
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