mirror of https://github.com/mkerrisk/man-pages
83 lines
2.1 KiB
Groff
83 lines
2.1 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\"
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.TH WCSNCASECMP 3 2010-09-15 "GNU" "Linux Programmer's Manual"
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.SH NAME
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wcsncasecmp \- compare two fixed-size wide-character strings, ignoring case
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.SH SYNOPSIS
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.nf
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.B #include <wchar.h>
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.sp
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.BI "int wcsncasecmp(const wchar_t *" s1 ", const wchar_t *" s2 ", size_t " n );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR wcsncasecmp ():
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.PD 0
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.ad l
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.RS 4
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.TP 4
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Since glibc 2.10:
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_XOPEN_SOURCE\ >=\ 700 || _POSIX_C_SOURCE\ >=\ 200809L
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.TP
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Before glibc 2.10:
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_GNU_SOURCE
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.RE
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.ad
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.PD
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.SH DESCRIPTION
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The
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.BR wcsncasecmp ()
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function is the wide-character equivalent of the
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.BR strncasecmp (3)
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function.
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It compares the wide-character string pointed to
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by \fIs1\fP and the wide-character string
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pointed to by \fIs2\fP, but at most
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\fIn\fP wide characters from each string, ignoring case differences
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.RB ( towupper (3),
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.BR towlower (3)).
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.SH "RETURN VALUE"
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The
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.BR wcsncasecmp ()
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function returns zero
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if the wide-character strings at
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\fIs1\fP and \fIs2\fP,
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truncated to at most length \fIn\fP, are equal except
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for case distinctions.
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It returns a positive integer if truncated \fIs1\fP is
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greater than truncated \fIs2\fP, ignoring case.
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It returns a negative integer
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if truncated \fIs1\fP is smaller than truncated \fIs2\fP, ignoring case.
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.SH VERSIONS
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The
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.BR wcsncasecmp ()
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function is provided in glibc since version 2.1.
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.SH "CONFORMING TO"
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POSIX.1-2008.
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This function is not specified in POSIX.1-2001,
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and is not widely available on other systems.
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.SH NOTES
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The behavior of
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.BR wcsncasecmp ()
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depends on the
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.B LC_CTYPE
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category of the
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current locale.
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.SH "SEE ALSO"
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.BR strncasecmp (3),
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.BR wcsncmp (3)
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