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+'\" et
+.TH STRXFRM "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.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,
+strxfrm_l
+\(em string transformation
+.SH SYNOPSIS
+.LP
+.nf
+#include <string.h>
+.P
+size_t strxfrm(char *restrict \fIs1\fP, const char *restrict \fIs2\fP, size_t \fIn\fP);
+size_t strxfrm_l(char *restrict \fIs1\fP, const char *restrict \fIs2\fP,
+    size_t \fIn\fP, locale_t \fIlocale\fP);
+.fi
+.SH DESCRIPTION
+For
+\fIstrxfrm\fR():
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fIstrxfrm\fR()
+and
+\fIstrxfrm_l\fR()
+functions shall transform the string pointed to by
+.IR s2
+and place the resulting string into the array pointed to by
+.IR s1 .
+The transformation is such that if
+\fIstrcmp\fR()
+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\fR()
+or
+\fIstrcoll_l\fR(),
+respectively, applied to the same two original strings
+with the same locale.
+No more than
+.IR n
+bytes are placed into the resulting array pointed to by
+.IR s1 ,
+including the terminating NUL character. If
+.IR n
+is 0,
+.IR s1
+is permitted to be a null pointer. If copying takes place between
+objects that overlap, the behavior is undefined.
+.P
+The
+\fIstrxfrm\fR()
+and
+\fIstrxfrm_l\fR()
+functions shall not change the setting of
+.IR errno
+if successful.
+.P
+Since no return value is reserved to indicate an error, an
+application wishing to check for error situations should set
+.IR errno
+to 0, then call
+\fIstrxfrm\fR()
+or
+\fIstrxfrm_l\fR(),
+then check
+.IR errno .
+.P
+The behavior is undefined if the
+.IR locale
+argument to
+\fIstrxfrm_l\fR()
+is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
+object handle.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIstrxfrm\fR()
+and
+\fIstrxfrm_l\fR()
+shall return the length of the transformed string (not including the
+terminating NUL character). If the value returned is
+.IR n
+or more, the contents of the array pointed to by
+.IR s1
+are unspecified.
+.P
+On error,
+\fIstrxfrm\fR()
+and
+\fIstrxfrm_l\fR()
+may set
+.IR errno
+but no return value is reserved to indicate an error.
+.SH ERRORS
+These functions may fail if:
+.TP
+.BR EINVAL
+The string pointed to by the
+.IR s2
+argument contains characters outside the domain of the collating
+sequence.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+The transformation function is such that two transformed strings can be
+ordered by
+\fIstrcmp\fR()
+as appropriate to collating sequence information in the
+current locale (category
+.IR LC_COLLATE ).
+.P
+The fact that when
+.IR n
+is 0
+.IR s1
+is permitted to be a null pointer is useful to determine the size of
+the
+.IR s1
+array prior to making the transformation.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIstrcmp\fR\^(\|)",
+.IR "\fIstrcoll\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<string.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .