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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "STRXFRM" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" strxfrm 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+strxfrm \- string transformation
+.SH SYNOPSIS
+.LP
+\fB#include <string.h>
+.br
+.sp
+size_t strxfrm(char *restrict\fP \fIs1\fP\fB, const char *restrict\fP
+\fIs2\fP\fB, size_t\fP \fIn\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIstrxfrm\fP() function shall transform the string pointed to
+by \fIs2\fP and place the resulting string into the array
+pointed to by \fIs1\fP. The transformation is such that if \fIstrcmp\fP()
+is applied to
+two transformed strings, it shall return a value greater than, equal
+to, or less than 0, corresponding to the result of \fIstrcoll\fP()
+applied to the same two original strings. No more than \fIn\fP bytes
+are placed
+into the resulting array pointed to by \fIs1\fP, including the terminating
+null byte. If \fIn\fP is 0, \fIs1\fP is permitted to
+be a null pointer. If copying takes place between objects that overlap,
+the behavior is undefined.
+.LP
+The
+\fIstrxfrm\fP() function shall not change the setting of \fIerrno\fP
+if successful.
+.LP
+Since no return value is reserved to indicate an error, an application
+wishing to check for error situations should set
+\fIerrno\fP to 0, then call \fIstrxfrm\fP(), then check \fIerrno\fP.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIstrxfrm\fP() shall return the length
+of the transformed string (not including the terminating
+null byte). If the value returned is \fIn\fP or more, the contents
+of the array pointed to by \fIs1\fP are unspecified.
+.LP
+On
+error, \fIstrxfrm\fP() may set \fIerrno\fP but no return value is
+reserved to indicate an error. 
+.SH ERRORS
+.LP
+The \fIstrxfrm\fP() function may fail if:
+.TP 7
+.B EINVAL
+The string pointed to by the \fIs2\fP argument contains characters
+outside the domain of the collating sequence. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The transformation function is such that two transformed strings can
+be ordered by \fIstrcmp\fP() as appropriate to collating sequence
+information in the program's locale (category
+\fILC_COLLATE ).\fP
+.LP
+The fact that when \fIn\fP is 0 \fIs1\fP is permitted to be a null
+pointer is useful to determine the size of the \fIs1\fP
+array prior to making the transformation.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIstrcmp\fP(), \fIstrcoll\fP(), the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<string.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version 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 .