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int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
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 wcsncasecmp() function is the wide-character equivalent of the
strncasecmp(3) function. It compares the wide-character string pointed
to by s1 and the wide-character string pointed to by s2, but at most n
wide characters from each string, ignoring case differences (towup-
The wcsncasecmp() function returns zero if the wide-character strings
at s1 and 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.
The wcsncasecmp() function is provided in glibc since version 2.1.
Multithreading (see pthreads(7))
The wcsncasecmp() 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 wcsncasecmp() depends on the LC_CTYPE category of the
GNU 2014-01-22 WCSNCASECMP(3)