#include <string.h> int strncasecmp(const char *s1, const char *s2, size_t max);
This function compares s1 and s2, ignoring case, up to a maximum of max characters.
Zero if the strings are equal, a positive number if s1 comes after s2 in the ASCII collating sequense, else a negative number.
not ANSI, not POSIX
if (strncasecmp(foo, "-i", 2) == 0) do_include();
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