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+'\" t
+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   Dinkumware C library reference http://www.dinkumware.com/
+.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
+.\"
+.TH wcsncasecmp 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+wcsncasecmp \- compare two fixed-size wide-character strings, ignoring case
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.PP
+.BI "int wcsncasecmp(const wchar_t " s1 [. n "], const wchar_t " s2 [. n "], s\
+ize_t " n );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR wcsncasecmp ():
+.nf
+    Since glibc 2.10:
+        _POSIX_C_SOURCE >= 200809L
+    Before glibc 2.10:
+        _GNU_SOURCE
+.fi
+.SH DESCRIPTION
+The
+.BR wcsncasecmp ()
+function is the wide-character equivalent of the
+.BR strncasecmp (3)
+function.
+It compares the wide-character string pointed to
+by
+.I s1
+and the wide-character string
+pointed to by
+.IR s2 ,
+but at most
+.I n
+wide characters from each string, ignoring case differences
+.RB ( towupper (3),
+.BR towlower (3)).
+.SH RETURN VALUE
+The
+.BR wcsncasecmp ()
+function returns zero
+if the wide-character strings at
+.I s1
+and
+.IR s2 ,
+truncated to at most length
+.IR n ,
+are equal except
+for case distinctions.
+It returns a positive integer if truncated
+.I s1
+is
+greater than truncated
+.IR s2 ,
+ignoring case.
+It returns a negative integer
+if truncated
+.I s1
+is smaller than truncated
+.IR s2 ,
+ignoring case.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR wcsncasecmp ()
+T}	Thread safety	MT-Safe locale
+.TE
+.sp 1
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+glibc 2.1.
+.SH NOTES
+The behavior of
+.BR wcsncasecmp ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.SH SEE ALSO
+.BR strncasecmp (3),
+.BR wcsncmp (3)