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int wcscasecmp(const wchar_t *s1, const wchar_t *s2);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
The wcscasecmp() function is the wide-character equivalent of the str-
casecmp(3) function. It compares the wide-character string pointed to
by s1 and the wide-character string pointed to by s2, ignoring case
differences (towupper(3), towlower(3)).
The wcscasecmp() function returns zero if the wide-character strings at
s1 and s2 are equal except for case distinctions. It returns a posi-
tive integer if s1 is greater than s2, ignoring case. It returns a
negative integer if s1 is smaller than s2, ignoring case.
The wcscasecmp() function is provided in glibc since version 2.1.
Multithreading (see pthreads(7))
The wcscasecmp() function is thread-safe with exceptions. It can be
safely used in multithreaded applications, as long as setlocale(3) is
not called to change the locale during its execution.
POSIX.1-2008. This function is not specified in POSIX.1-2001, and is
not widely available on other systems.
The behavior of wcscasecmp() depends on the LC_CTYPE category of the
GNU 2014-01-22 WCSCASECMP(3)