Strange name for a string-comparing function.
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Why don't you use some standard strings libs, instead of reinventing the wheel again?
Doing str++ on a void pointer certainly won't work on multi-byte characters strings. Also, not for all the codepages character codes order matches the order humans naturally use to sort stings. Good example is KOI8-R charset, for which such a way of comparison would lead to a totally incorrect ordering of russian strings.