xref: /illumos-gate/usr/src/man/man3c/strxfrm.3c (revision d8109ce4330e1b8ad6c29f9fccacec969066bb9d)

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 1989 AT&T.
Portions Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved.
Copyright 2014 Garrett D'Amore <garrett@damore.org>

STRXFRM 3C "Jun 21, 2014"
NAME
strxfrm, strxfrm_l - string transformation
SYNOPSIS

#include <string.h>

size_t strxfrm(char *restrict s1, const char *restrict s2, size_t n);

size_t strxfrm_l(char *restrict s1, const char *restrict s2, size_t n,
 locale_t loc);
DESCRIPTION

The strxfrm() function transforms the string pointed to by s2 and places the resulting string into the array pointed to by s1. The transformation is such that if strcmp(3C) is applied to two transformed strings, it returns a value greater than, equal to or less than 0, corresponding to the result of strcoll(3C) applied to the same two original strings. No more than n bytes are placed into the resulting array pointed to by s1, including the terminating null byte. If n is 0, s1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined.

The strxfrm() function does 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 strxfrm(), then check errno.

The strxfrm_l() functions behaves identically to the function strxfrm(), except instead of operating in the current locale it operates in the locale specified by the argument loc.

RETURN VALUES

Upon successful completion, strxfrm() returns the length of the transformed string (not including the terminating null byte). If the value returned is n or more, the contents of the array pointed to by s1 are indeterminate.

On error, strxfrm() may set errno but no return value is reserved to indicate the error.

USAGE

The transformation function is such that two transformed strings can be ordered by strcmp(3C) as appropriate to collating sequence information in the locale (category LC_COLLATE).

The fact that when n is 0, s1 is permitted to be a null pointer, is useful to determine the size of the s1 array prior to making the transformation.

EXAMPLES

Example 1 A sample of using the strxfm() function.

The value of the following expression is the size of the array needed to hold the transformation of the string pointed to by s.

1 + strxfrm(NULL, s, 0);
FILES
/usr/lib/locale/locale/LC_COLLATE/*
collation database for locale
ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
CSI Enabled
Interface Stability Standard
MT-Level MT-Safe
SEE ALSO

localedef(1), newlocale(3C), setlocale(3C), strcmp(3C), strcoll(3C), uselocale(3C), wscoll(3C), attributes(5), environ(5), standards(5)