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+'\" et
+.TH WCTRANS "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
+wctrans,
+wctrans_l
+\(em define character mapping
+.SH SYNOPSIS
+.LP
+.nf
+#include <wctype.h>
+.P
+wctrans_t wctrans(const char *\fIcharclass\fP);
+wctrans_t wctrans_l(const char *\fIcharclass\fP, locale_t \fIlocale\fP);
+.fi
+.SH DESCRIPTION
+For
+\fIwctrans\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
+\fIwctrans\fR()
+and
+\fIwctrans_l\fR()
+functions are defined for valid character mapping names identified
+in the current locale. The
+.IR charclass
+is a string identifying a generic character mapping name for which
+codeset-specific information is required. The following character
+mapping names are defined in all locales:
+.BR tolower
+and
+.BR toupper .
+.P
+These functions shall return a value of type
+.BR wctrans_t ,
+which can be used as the second argument to subsequent calls of
+\fItowctrans\fR()
+and
+\fItowctrans_l\fR().
+.P
+The
+\fIwctrans\fR()
+and
+\fIwctrans_l\fR()
+functions shall determine values of
+.BR wctrans_t
+according to the rules of the coded character set defined by character
+mapping information in the current locale
+or in the locale represented by
+.IR locale ,
+respectively (category
+.IR LC_CTYPE ).
+.P
+The values returned by
+\fIwctrans\fR()
+shall be valid until a call to
+\fIsetlocale\fR()
+that modifies the category
+.IR LC_CTYPE .
+.P
+The values returned by
+\fIwctrans_l\fR()
+shall be valid only in calls to
+\fItowctrans_l\fR()
+with a locale represented by
+.IR locale
+with the same
+.IR LC_CTYPE
+category value.
+.P
+The behavior is undefined if the
+.IR locale
+argument to
+\fIwctrans_l\fR()
+is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
+object handle.
+.SH "RETURN VALUE"
+The
+\fIwctrans\fR()
+and
+\fIwctrans_l\fR()
+functions shall return 0 and may set
+.IR errno
+to indicate the error if the given character mapping name is not valid
+for the current locale (category
+.IR LC_CTYPE );
+otherwise, they shall return a non-zero object of type
+.BR wctrans_t
+that can be used in calls to
+\fItowctrans\fR()
+and
+\fItowctrans_l\fR().
+.SH ERRORS
+These functions may fail if:
+.TP
+.BR EINVAL
+The character mapping name pointed to by
+.IR charclass
+is not valid in the current locale.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fItowctrans\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<wctype.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 .