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'\" t
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sun Jul 25 10:41:28 1993 by Rik Faith (faith@cs.unc.edu)
.TH strxfrm 3 2024-05-02 "Linux man-pages (unreleased)"
.SH NAME
strxfrm \- string transformation
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <string.h>
.P
.BI "size_t strxfrm(char " dest "[restrict ." n "], \
const char " src "[restrict ." n ],
.BI " size_t " n );
.fi
.SH DESCRIPTION
The
.BR strxfrm ()
function transforms the
.I src
string into a
form such that the result of
.BR strcmp (3)
on two strings that have
been transformed with
.BR strxfrm ()
is the same as the result of
.BR strcoll (3)
on the two strings before their transformation.
The first
.I n
bytes of the transformed string are placed in
.IR dest .
The transformation is based on the program's current
locale for category
.BR LC_COLLATE .
(See
.BR setlocale (3)).
.SH RETURN VALUE
The
.BR strxfrm ()
function returns the number of bytes required to
store the transformed string in
.I dest
excluding the
terminating null byte (\[aq]\e0\[aq]).
If the value returned is
.I n
or more, the
contents of
.I dest
are indeterminate.
.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 strxfrm ()
T} Thread safety MT-Safe locale
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C89, SVr4, 4.3BSD.
.SH SEE ALSO
.BR memcmp (3),
.BR setlocale (3),
.BR strcasecmp (3),
.BR strcmp (3),
.BR strcoll (3),
.BR string (3)
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