libc.info: wcsncmp

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`wcsncmp'--compare part of two wide-character strings

*Synopsis*
     #include <wchar.h>
     int wcsncmp(const wchar_t *S1, const wchar_t *S2, size_t N);
   *Description*
The `wcsncmp' function compares not more than N wide-character codes
(wide-character codes that follow a null wide-character code are not
compared) from the array pointed to by S1 to the array pointed to by S2.
   The sign of a non-zero return value is determined by the sign of the
difference between the values of the first pair of wide-character codes
that differ in the objects being compared.
*Returns*
Upon successful completion, `wcsncmp' returns an integer greater than,
equal to or less than 0, if the possibly null-terminated array pointed
to by S1 is greater than, equal to or less than the possibly
null-terminated array pointed to by S2 respectively.
*Portability*
`wcsncmp' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.