+.\"***************************************************************************
+.\" Copyright (c) 1998-2005,2006 Free Software Foundation, Inc. *
+.\" *
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+.\" 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, *
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+.\" copies of the Software, and to permit persons to whom the Software is *
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+.\" *
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+.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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+.\" Except as contained in this notice, the name(s) of the above copyright *
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+.\"***************************************************************************
+.\"
+.\" $Id: curs_overlay.3x,v 1.14 2006/02/25 21:49:19 tom Exp $
.TH curs_overlay 3X ""
+.na
+.hy 0
.SH NAME
-\fBoverlay\fR, \fBoverwrite\fR, \fBcopywin\fR - overlay and
-manipulate overlapped \fBcurses\fR windows
+\fBoverlay\fR,
+\fBoverwrite\fR,
+\fBcopywin\fR - overlay and manipulate overlapped \fBcurses\fR windows
+.ad
+.hy
.SH SYNOPSIS
\fB#include <curses.h>\fR
-
+.sp
\fBint overlay(const WINDOW *srcwin, WINDOW *dstwin);\fR
.br
\fBint overwrite(const WINDOW *srcwin, WINDOW *dstwin);\fR
.br
-\fBint copywin(WINDOW *srcwin, WINDOW *dstwin, int sminrow,
- int smincol, int dminrow, int dmincol, int dmaxrow,
- int dmaxcol, int overlay);\fR
+\fBint copywin(const WINDOW *srcwin, WINDOW *dstwin, int sminrow,\fR
+ \fBint smincol, int dminrow, int dmincol, int dmaxrow,\fR
+ \fBint dmaxcol, int overlay);\fR
.SH DESCRIPTION
The \fBoverlay\fR and \fBoverwrite\fR routines overlay \fIsrcwin\fR on
top of \fIdstwin\fR. \fIscrwin\fR and \fIdstwin\fR are not required
to be the same size; only text where the two windows overlap is
copied. The difference is that \fBoverlay\fR is non-destructive
(blanks are not copied) whereas \fBoverwrite\fR is destructive.
-
+.PP
The \fBcopywin\fR routine provides a finer granularity of control over the
\fBoverlay\fR and \fBoverwrite\fR routines. Like in the \fBprefresh\fR
routine, a rectangle is specified in the destination window, (\fIdminrow\fR,
Routines that return an integer return \fBERR\fR upon failure, and \fBOK\fR
(SVr4 only specifies "an integer value other than \fBERR\fR") upon successful
completion.
+.PP
+X/Open defines no error conditions.
+In this implementation,
+\fBcopywin\fP,
+\fBoverlay\fP and \fBoverwrite\fP return an error
+if either of the window pointers are null, or
+if some part of the window would be placed off-screen.
.SH NOTES
Note that \fBoverlay\fR and \fBoverwrite\fR may be macros.
.SH PORTABILITY
The XSI Curses standard, Issue 4 describes these functions (adding the const
qualifiers). It further specifies their behavior in the presence of characters
-with multi-byte renditions (not yet supported in this implementation).
+with multibyte renditions (not yet supported in this implementation).
.SH SEE ALSO
\fBcurses\fR(3X), \fBcurs_pad\fR(3X), \fBcurs_refresh\fR(3X)
.\"#
projects / ncurses.git / blobdiff