#include <string.h> int memicmp(const void *s1, const void *s2, size_t num);
This function compares two regions of memory, at s1 and s2, for num bytes, disregarding case.
Zero if they're the same, nonzero if different, the sign indicates "order".
not ANSI, not POSIX
if (memicmp(arg, "-i", 2) == 0) /* '-I' or '-include' etc. */ do_include();
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