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Fix crash on unknown option
getopts requires the last element of longopts to be filled with zeros.
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@ -82,6 +82,7 @@ int main(int argc, char *argv[])
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{"max-y", required_argument, 0, 'c'},
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{"zoom", required_argument, 0, 'z'},
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{"colors", required_argument, 0, 'C'},
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{0, 0, 0, 0}
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};
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std::string input;
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