function is the wide-character equivalent of the
It compares the wide-character string pointed to
by s1 and the wide-character string pointed to by s2, ignoring
function returns zero if the wide-character strings at
s1 and s2 are equal except for case distinctions.
It returns a
positive integer if s1 is greater than s2, ignoring case.
returns a negative integer if s1 is smaller
than s2, ignoring case.
function is provided in glibc since version 2.1.
This function is not specified in POSIX.1-2001,
and is not widely available on other systems.
The behavior of
depends on the
category of the