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.\" $Id: curs_getcchar.3x,v 1.21 2019/03/24 00:59:45 tom Exp $
.TH curs_getcchar 3X ""
.de bP
.ie n  .IP \(bu 4
.el    .IP \(bu 2
..
.SH NAME
\fBgetcchar\fP,
\fBsetcchar\fP \- Get a wide character string and rendition from a \fBcchar_t\fP or set a \fBcchar_t\fP from a wide-character string
.SH SYNOPSIS
\fB#include <curses.h>\fP
.sp
\fBint getcchar(\fP
.br
.B "        const cchar_t *\fIwcval\fP,"
.br
.B "        wchar_t *\fIwch\fP,"
.br
.B "        attr_t *\fIattrs\fP,"
.br
.B "        short *\fIcolor_pair\fP,"
.br
.B "        void *\fIopts\fP );"
.sp
.B "int setcchar("
.br
.B "        cchar_t *\fIwcval\fP,"
.br
.B "        const wchar_t *\fIwch\fP,"
.br
.B "        const attr_t \fIattrs\fP,"
.br
.B "        short \fIcolor_pair\fP,"
.br
.B "        const void *\fIopts\fP );"
.SH DESCRIPTION
.SS getcchar
.PP
The \fBgetcchar\fP function gets a wide-character string
and rendition from a \fBcchar_t\fP argument.
When \fIwch\fP is not a null pointer,
the \fBgetcchar\fP function does the following:
.bP
Extracts information from a \fBcchar_t\fP value \fIwcval\fP
.bP
Stores the character attributes in the location pointed to by \fIattrs\fP
.bP
Stores the color-pair in the location pointed to by \fIcolor_pair\fP
.bP
Stores the wide-character string,
characters referenced by \fIwcval\fP, into the array pointed to by \fIwch\fP.
.PP
When
\fIwch\fP
is a null pointer, the
\fBgetcchar\fP
function does the following:
.bP
Obtains the number of wide characters pointed to by \fIwcval\fP
.bP
Does not change the data referenced by
\fIattrs\fP
or
\fIcolor_pair\fP
.SS setcchar
.PP
The \fBsetcchar\fP function initializes the location pointed to by \fIwcval\fP
by using:
.bP
The character attributes in
\fIattrs\fP
.bP
The color pair in
\fIcolor_pair\fP
.bP
The wide-character string pointed to by \fIwch\fP.
The string must be L'\\0' terminated,
contain at most one spacing character,
which must be the first.
.IP
Up to \fBCCHARW_MAX\fP\-1 nonspacing characters may follow.
Additional nonspacing characters are ignored.
.IP
The string may contain a single control character instead.
In that case, no nonspacing characters are allowed.
.SH EXTENSIONS
.PP
X/Open Curses documents the \fIopts\fP argument as reserved for future use,
saying that it must be null.
This implementation 
uses that parameter in ABI 6 for the functions which have a color-pair
parameter to support extended color pairs:
.bP
For  functions  which modify the color, e.g., \fBsetcchar\fP,
if \fIopts\fP is set it is treated as a pointer to \fBint\fP,
and used to  set  the  color pair instead of the \fBshort\fP pair parameter.
.bP
For functions which retrieve the color, e.g., \fBgetcchar\fP,
if \fIopts\fP is set it is treated as a pointer to \fBint\fP,
and  used  to  retrieve  the color pair as an \fBint\fP value,
in addition retrieving it via the standard pointer to \fBshort\fP parameter.
.SH NOTES
.PP
The \fIwcval\fP argument may be a value generated by a call to
\fBsetcchar\fP or by a function that has a \fBcchar_t\fP output argument.
If \fIwcval\fP is constructed by any other means, the effect is unspecified.
.SH RETURN VALUE
.PP
When \fIwch\fP is a null pointer,
\fBgetcchar\fP returns the number of wide characters referenced by
\fIwcval\fP,
including one for a trailing null.
.PP
When \fIwch\fP is not a null pointer,
\fBgetcchar\fP returns \fBOK\fP upon successful completion,
and \fBERR\fP otherwise.
.PP
Upon successful completion, \fBsetcchar\fP returns \fBOK\fP.
Otherwise, it returns \fBERR\fP.
.SH SEE ALSO
.PP
Functions:
\fBcurs_attr\fR(3X),
\fBcurs_color\fR(3X),
\fBcurses\fR(3X),
\fBwcwidth\fR(3).
