wcsncasecmp - compare two fixed-size wide-character strings, ignoring case
The wcsncasecmp() function returns zero if the wide-character strings at
s2, truncated to at most length
n, are equal except for case distinctions. It returns a positive integer if truncated
s1 is greater than truncated
s2, ignoring case. It returns a negative integer if truncated
s1 is smaller than truncated
s2, ignoring case.
POSIX.1-2008. This function is not specified in POSIX.1-2001, and is not widely available on other systems.
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