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.\"
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for
.\" permission to reproduce portions of its copyrighted documentation.
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.\"
.\" The Institute of Electrical and Electronics Engineers and The Open
.\" Group, have given us permission to reprint portions of their
.\" documentation.
.\"
.\" In the following statement, the phrase ``this text'' refers to portions
.\" of the system documentation.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics
.\" Engineers, Inc and The Open Group. In the event of any discrepancy
.\" between these versions and the original IEEE and The Open Group
.\" Standard, the original IEEE and The Open Group Standard is the referee
.\" document. The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
.\"
.\" This notice shall appear on any product containing this material.
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
.\" Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
.\" Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved
.\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
.\"
.TH WCSCOLL 3C "April 9, 2016"
.SH NAME
wcscoll, wcscoll_l wscoll \- wide character string comparison using collating information
.SH SYNOPSIS
.LP
.nf
#include <wchar.h>
\fBint\fR \fBwcscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
.fi
.LP
.nf
\fBint\fR \fBwcscoll_l\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR, \fBlocale_t\fR \fIloc\fR);
.fi
.LP
.nf
\fBint\fR \fBwscoll\fR(\fBconst wchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR);
.fi
.SH DESCRIPTION
.LP
The \fBwcscoll()\fR, \fBwcscoll_l()\fR, and \fBwscoll()\fR functions compare
the wide character
string pointed to by \fIws1\fR to the wide character string pointed to by
\fIws2\fR, both interpreted as appropriate to the \fBLC_COLLATE\fR locale
category.
.LP
These functions do not change the setting of \fBerrno\fR if successful.
.LP
An application wanting to check for error situations should set \fBerrno\fR to
0 before calling these functions. If \fBerrno\fR is non-zero
on return, an error has occurred.
.LP
The function \fBwcsoll_l()\fR behaves identically to \fBwcsoll\fR(), except
instead of operating in the current locale, it operates in the locale
specified by \fIloc\fR.
.SH RETURN VALUES
.LP
Upon successful completion, these functions return an
integer greater than, equal to, or less than 0, depending upon whether the wide
character string pointed to by \fIws1\fR is greater than, equal to, or less
than the wide character string pointed to by \fIws2\fR, when both are
interpreted as appropriate to the current locale, or the locale
specified by \fIloc\fR. On error,
they set \fBerrno\fR, but no return value is reserved to indicate an error.
.SH ERRORS
.LP
The \fBwcscoll()\fR, \fBwcscoll_l()\fR and \fBwscoll()\fR functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The \fIws1\fR or \fIws2\fR arguments contain wide character codes outside the
domain of the collating sequence.
.RE
.SH USAGE
.LP
The \fBwcsxfrm\fR(3C) and \fBwcscmp\fR(3C) functions should be used for sorting
large lists, or when performing many comparisons on the same strings.
.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
CSI Enabled
_
Interface Stability See below.
_
MT-Level MT-Safe
.TE
.LP
The \fBwcscoll()\fR and \fBwcscoll_l()\fR functions are Standard.
The \fBwscoll()\fR function is Committed.
.SH SEE ALSO
.LP
\fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale\fR(3C),
\fBwcscmp\fR(3C), \fBwcsxfrm\fR(3C), \fBattributes\fR(5),
\fBstandards\fR(5)
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