strbuf: add xstrdup_toupper()
Create a copy of an existing string and make all characters upper case. Similar xstrdup_tolower(). This function is used in a subsequent commit. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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