Sun Microsystems, Inc. gratefully acknowledges The Open Group for
permission to reproduce portions of its copyrighted documentation.
Original documentation from The Open Group can be obtained online at
http://www.opengroup.org/bookstore/.
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]
Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved.
#include <wchar.h> size_t wcsxfrm(wchar_t *ws1, const wchar_t *ws2, size_t n);
size_t wsxfrm(wchar_t *ws1, const wchar_t *ws2, size_t n);
The wcsxfrm() and wcsxfrm() functions transform the wide character string pointed to by ws2 and place the resulting wide character string into the array pointed to by ws1. The transformation is such that if either the wcscmp(3C) or wscmp(3C) functions are applied to two transformed wide strings, they return a value greater than, equal to, or less than 0, corresponding to the result of the wcscoll(3C) or wscoll(3C) function applied to the same two original wide character strings. No more than n wide-character codes are placed into the resulting array pointed to by ws1, including the terminating null wide-character code. If n is 0, ws1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined.
The wcsxfrm() and wsxfrm() functions do not change the setting of errno if successful.
Since no return value is reserved to indicate an error, an application wishing to check for error situations should set errno to 0, then call wcsxfrm() or wsxfrm(), then check errno.
The wcsxfrm() and wsxfrm() functions return the length of the transformed wide character string (not including the terminating null wide-character code). If the value returned is n or more, the contents of the array pointed to by ws1 are indeterminate.
On error, wcsxfrm() and wsxfrm() may set errno but no return value is reserved to indicate an error.
The wcsxfrm() and wsxfrm() functions may fail if: EINVAL
The wide character string pointed to by ws2 contains wide-character codes outside the domain of the collating sequence.
The transformation function is such that two transformed wide character strings can be ordered by the wcscmp() or wscmp() functions as appropriate to collating sequence information in the program's locale (category LC_COLLATE).
The fact that when n is 0, ws1 is permitted to be a null pointer, is useful to determine the size of the ws1 array prior to making the transformation.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| CSI Enabled |
| Interface Stability wcsxfrm() is Standard |
| MT-Level MT-Safe with exceptions |
The wcsxfrm() and wsxfrm() functions can be used safely in multithreaded applications as long as setlocale(3C) is not being called to change the locale.
setlocale(3C), wcscmp(3C), wcscoll(3C), wscmp(3C), wscoll(3C), attributes(5), standards(5)