Problem with converting accented characters to uppercase

Question

The command uppercase does not work properly with certain accented characters, like  the Hungarian ő or ű or such characters as ł, đ and ć. If I type the characters like H{o}, it works, but I'd like to type it directly as ő, as it's used multiple times.
Could you suggest a workaround?
documentclass{article}

usepackage{t1enc}
usepackage[utf8]{inputenc}

begin{document}
uppercase{árvíztH{u}űrH{o}ő tükörfúrógép đdłlćc}
end{document}

Mico · Accepted Answer

uppercase is a TeX "primitive". If you use the LaTeX macro MakeUppercase instead, you'll achieve your objective easily.
You should also replace the obsolete usepackage{t1enc} with usepackage[T1]{fontenc}.

Observe, incidentally, that the output of uppercase{ű} is ő, which is rather incorrect.
documentclass{article}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}

begin{document}
texttt{stringuppercase}:
uppercase{árvíztH{u}űrH{o}ő tükörfúrógép đdłlćc}

medskip
texttt{stringMakeUppercase}:
MakeUppercase{árvíztH{u}űrH{o}ő tükörfúrógép đdłlćc}
end{document}

Problem with converting accented characters to uppercase

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