Function ToUpper

library/cpp/charset/codepage.h:300–304

}

inline void ToUpper(char* s, size_t n, const CodePage& cp = csYandex) {
    char* const e = s + n;
    for (; s != e; ++s)
        *s = cp.ToUpper(*s);
}

inline TString ToLower(TString s, const CodePage& cp, size_t pos = 0, size_t n = TString::npos) {
    s.Transform([&cp](size_t, char c) { return cp.ToLower(c); }, pos, n);