2002-05-21 05:30:25 +00:00
|
|
|
.\"***************************************************************************
|
2020-02-19 16:58:06 +00:00
|
|
|
.\" Copyright 2019,2020 Thomas E. Dickey *
|
|
|
|
.\" Copyright 2001-2015,2017 Free Software Foundation, Inc. *
|
2002-05-21 05:30:25 +00:00
|
|
|
.\" *
|
|
|
|
.\" Permission is hereby granted, free of charge, to any person obtaining a *
|
|
|
|
.\" copy of this software and associated documentation files (the *
|
|
|
|
.\" "Software"), to deal in the Software without restriction, including *
|
|
|
|
.\" without limitation the rights to use, copy, modify, merge, publish, *
|
|
|
|
.\" distribute, distribute with modifications, sublicense, and/or sell *
|
|
|
|
.\" copies of the Software, and to permit persons to whom the Software is *
|
|
|
|
.\" furnished to do so, subject to the following conditions: *
|
|
|
|
.\" *
|
|
|
|
.\" The above copyright notice and this permission notice shall be included *
|
|
|
|
.\" in all copies or substantial portions of the Software. *
|
|
|
|
.\" *
|
|
|
|
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
|
|
|
|
.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
|
|
|
|
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
|
|
|
|
.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
|
|
|
|
.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
|
|
|
|
.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
|
|
|
|
.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
|
|
|
|
.\" *
|
|
|
|
.\" Except as contained in this notice, the name(s) of the above copyright *
|
|
|
|
.\" holders shall not be used in advertising or otherwise to promote the *
|
|
|
|
.\" sale, use or other dealings in this Software without prior written *
|
|
|
|
.\" authorization. *
|
|
|
|
.\"***************************************************************************
|
|
|
|
.\"
|
2020-02-19 16:58:06 +00:00
|
|
|
.\" $Id: curs_getcchar.3x,v 1.24 2020/02/02 23:34:34 tom Exp $
|
2002-05-21 05:30:25 +00:00
|
|
|
.TH curs_getcchar 3X ""
|
2014-02-28 19:18:07 +00:00
|
|
|
.de bP
|
2020-02-07 08:36:41 +00:00
|
|
|
.ie n .IP \(bu 4
|
|
|
|
.el .IP \(bu 2
|
2014-02-28 19:18:07 +00:00
|
|
|
..
|
2002-05-21 05:30:25 +00:00
|
|
|
.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
|
2020-02-07 08:36:41 +00:00
|
|
|
.B " const void *\fIopts\fP );"
|
2002-05-21 05:30:25 +00:00
|
|
|
.SH DESCRIPTION
|
2020-02-07 08:36:41 +00:00
|
|
|
.SS getcchar
|
2002-05-21 05:30:25 +00:00
|
|
|
.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:
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
Extracts information from a \fBcchar_t\fP value \fIwcval\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
Stores the character attributes in the location pointed to by \fIattrs\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
Stores the color-pair in the location pointed to by \fIcolor_pair\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
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:
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
Obtains the number of wide characters pointed to by \fIwcval\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
Does not change the data referenced by
|
|
|
|
\fIattrs\fP
|
|
|
|
or
|
|
|
|
\fIcolor_pair\fP
|
2020-02-07 08:36:41 +00:00
|
|
|
.SS setcchar
|
2002-05-21 05:30:25 +00:00
|
|
|
.PP
|
|
|
|
The \fBsetcchar\fP function initializes the location pointed to by \fIwcval\fP
|
|
|
|
by using:
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
The character attributes in
|
|
|
|
\fIattrs\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
The color pair in
|
|
|
|
\fIcolor_pair\fP
|
2014-02-28 19:18:07 +00:00
|
|
|
.bP
|
2002-05-21 05:30:25 +00:00
|
|
|
The wide-character string pointed to by \fIwch\fP.
|
|
|
|
The string must be L'\\0' terminated,
|
2008-11-09 14:08:54 +00:00
|
|
|
contain at most one spacing character,
|
|
|
|
which must be the first.
|
|
|
|
.IP
|
2014-02-28 19:18:07 +00:00
|
|
|
Up to \fBCCHARW_MAX\fP\-1 nonspacing characters may follow.
|
2008-11-09 14:08:54 +00:00
|
|
|
Additional nonspacing characters are ignored.
|
|
|
|
.IP
|
|
|
|
The string may contain a single control character instead.
|
|
|
|
In that case, no nonspacing characters are allowed.
|
2020-02-07 08:36:41 +00:00
|
|
|
.SH EXTENSIONS
|
2002-05-21 05:30:25 +00:00
|
|
|
.PP
|
2020-02-07 08:36:41 +00:00
|
|
|
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
|
2002-05-21 05:30:25 +00:00
|
|
|
.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.
|
2014-03-01 00:40:26 +00:00
|
|
|
.SH RETURN VALUE
|
2002-05-21 05:30:25 +00:00
|
|
|
.PP
|
|
|
|
When \fIwch\fP is a null pointer,
|
|
|
|
\fBgetcchar\fP returns the number of wide characters referenced by
|
2014-02-28 19:18:07 +00:00
|
|
|
\fIwcval\fP,
|
|
|
|
including one for a trailing null.
|
2002-05-21 05:30:25 +00:00
|
|
|
.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.
|
2020-02-07 08:36:41 +00:00
|
|
|
.SH PORTABILITY
|
|
|
|
The \fBCCHARW_MAX\fP symbol is specific to ncurses.
|
|
|
|
X/Open Curses does not provide details for the layout of the \fBcchar_t\fP
|
|
|
|
structure.
|
|
|
|
It tells what data are stored in it:
|
|
|
|
.bP
|
|
|
|
a spacing character (\fBwchar_t\fP, i.e., 32-bits).
|
|
|
|
.bP
|
|
|
|
non-spacing characters (again, \fBwchar_t\fP's).
|
|
|
|
.bP
|
|
|
|
attributes (at least 16 bits, inferred from the various ACS- and WACS-flags).
|
|
|
|
.bP
|
|
|
|
color pair (at least 16 bits, inferred from the \fBunsigned short\fP type).
|
|
|
|
.PP
|
|
|
|
The non-spacing characters are optional,
|
|
|
|
in the sense that zero or more may be stored in a \fBcchar_t\fP.
|
|
|
|
XOpen/Curses specifies a limit:
|
|
|
|
.RS 4
|
|
|
|
.PP
|
|
|
|
Implementations may limit the number of non-spacing characters that can be
|
|
|
|
associated with a spacing character, provided any limit is at least 5.
|
|
|
|
.RE
|
|
|
|
.PP
|
|
|
|
The Unix implementations at the time follow that limit:
|
|
|
|
.bP
|
|
|
|
AIX\ 4 and OSF1\ 4 use the same declaration with an array of 5 non-spacing
|
|
|
|
characters \fIz\fP and a single spacing character \fIc\fP.
|
|
|
|
.bP
|
|
|
|
HP-UX\ 10 uses an opaque structure with 28 bytes,
|
|
|
|
which is large enough for the 6 \fBwchar_t\fP values.
|
|
|
|
.bP
|
|
|
|
Solaris xpg4 curses uses a single array of 6 \fBwchar_t\fP values.
|
|
|
|
.PP
|
|
|
|
This implementation's \fBcchar_t\fP was defined in 1995
|
|
|
|
using \fB5\fP for the total of spacing and non-spacing characters
|
|
|
|
(\fBCCHARW_MAX\fP).
|
|
|
|
That was probably due to a misreading of the AIX\ 4 header files,
|
|
|
|
because the X/Open Curses document was not generally available at that time.
|
|
|
|
Later (in 2002), this detail was overlooked when beginning to implement
|
|
|
|
the functions using the structure.
|
|
|
|
.PP
|
|
|
|
In practice, even four non-spacing characters may seem enough.
|
|
|
|
X/Open Curses documents possible uses for non-spacing characters,
|
|
|
|
including using them for ligatures between characters
|
|
|
|
(a feature apparently not supported by any curses implementation).
|
|
|
|
Unicode does not limit the (analogous) number of combining characters,
|
|
|
|
so some applications may be affected.
|
2002-05-21 05:30:25 +00:00
|
|
|
.SH SEE ALSO
|
|
|
|
.PP
|
|
|
|
Functions:
|
2007-12-30 11:08:14 +00:00
|
|
|
\fBcurs_attr\fR(3X),
|
|
|
|
\fBcurs_color\fR(3X),
|
2002-05-21 05:30:25 +00:00
|
|
|
\fBcurses\fR(3X),
|
2007-12-30 11:08:14 +00:00
|
|
|
\fBwcwidth\fR(3).
|