wcsncasecmp - compare two fixed-size wide-character strings, ignoring case

       For an explanation of the terms used in this section, see attributes(7).
       ┌──────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │ Interface                                                            │ Attribute     │ Value          │
       ├──────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │ wcsncasecmp()                                                        │ Thread safety │ MT-Safe locale │
       └──────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

       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 (towupper(3), towlower(3)).

       glibc 2.1.

       Standard C library (libc, -lc)

       wcsncasecmp - compare two fixed-size wide-character strings, ignoring case

       The behavior of wcsncasecmp() depends on the LC_CTYPE category of the current locale.

       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.

strncasecmp(3), wcsncmp(3)

Linux man-pages 6.9.1                              2024-05-02                                     wcsncasecmp(3)

       POSIX.1-2008.

#include<wchar.h>intwcsncasecmp(constwchar_ts1[.n],constwchar_ts2[.n],size_tn);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       wcsncasecmp():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE