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.TH WCSXFRM 3C "Nov 1, 2003"
.SH NAME
wcsxfrm, wsxfrm \- wide character string transformation
.SH SYNOPSIS
.LP
.nf
#include <wchar.h>

\fBsize_t\fR \fBwcsxfrm\fR(\fBwchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR, \fBsize_t\fR \fIn\fR);
.fi

.LP
.nf
\fBsize_t\fR \fBwsxfrm\fR(\fBwchar_t *\fR\fIws1\fR, \fBconst wchar_t *\fR\fIws2\fR, \fBsize_t\fR \fIn\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBwcsxfrm()\fR and \fBwcsxfrm()\fR functions transform the wide character
string pointed to by \fIws2\fR and place the resulting wide character string
into the array pointed to by \fIws1\fR. The transformation is such that if
either the \fBwcscmp\fR(3C) or \fBwscmp\fR(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  \fBwcscoll\fR(3C) or
\fBwscoll\fR(3C) function applied to the same two original wide character
strings. No more than  \fIn\fR wide-character codes are placed into the
resulting array pointed to by \fIws1\fR, including the terminating null
wide-character code. If \fIn\fR is 0, \fIws1\fR is permitted to be a null
pointer. If copying takes place between objects that overlap, the behavior is
undefined.
.sp
.LP
The \fBwcsxfrm()\fR and \fBwsxfrm()\fR functions do not change the setting of
\fBerrno\fR if successful.
.sp
.LP
Since no return value is reserved to indicate an error, an application wishing
to check for error situations should set \fBerrno\fR to 0, then call
\fBwcsxfrm()\fR or \fBwsxfrm()\fR, then check \fBerrno\fR.
.SH RETURN VALUES
.sp
.LP
The \fBwcsxfrm()\fR and \fBwsxfrm()\fR functions return the length of the
transformed wide character string (not including the terminating null
wide-character code). If the value returned is \fIn\fR or more, the contents of
the array pointed to by \fIws1\fR are indeterminate.
.sp
.LP
On error, \fBwcsxfrm()\fR and \fBwsxfrm()\fR may set \fBerrno\fR but no return
value is reserved to indicate an error.
.SH ERRORS
.sp
.LP
The \fBwcsxfrm()\fR and \fBwsxfrm()\fR functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The wide character string pointed to by \fIws2\fR contains wide-character codes
outside the domain of the collating sequence.
.RE

.SH USAGE
.sp
.LP
The transformation function is such that  two transformed wide character
strings can be ordered by the \fBwcscmp()\fR or \fBwscmp()\fR functions as
appropriate to collating sequence information in the program's locale (category
\fBLC_COLLATE\fR).
.sp
.LP
The fact that when  \fIn\fR is 0, \fIws1\fR is permitted to be a null pointer,
is useful to determine the size of the  \fIws1\fR array prior to making the
transformation.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
l | l
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	\fBwcsxfrm()\fR is Standard
_
MT-Level	MT-Safe with exceptions
.TE

.sp
.LP
The \fBwcsxfrm()\fR and \fBwsxfrm()\fR functions can be used safely in
multithreaded applications as long as \fBsetlocale\fR(3C) is not being called
to change the locale.
.SH SEE ALSO
.sp
.LP
\fBsetlocale\fR(3C), \fBwcscmp\fR(3C), \fBwcscoll\fR(3C), \fBwscmp\fR(3C),
\fBwscoll\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)