.\"***************************************************************************
-.\" Copyright (c) 1998 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2001,2005 Free Software Foundation, Inc. *
.\" *
.\" Permission is hereby granted, free of charge, to any person obtaining a *
.\" copy of this software and associated documentation files (the *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_kernel.3x,v 1.13 2001/12/08 18:01:25 tom Exp $
+.\" $Id: curs_kernel.3x,v 1.15 2005/05/15 16:18:13 tom Exp $
.TH curs_kernel 3X ""
+.na
+.hy 0
.SH NAME
-\fBdef_prog_mode\fR, \fBdef_shell_mode\fR,
-\fBreset_prog_mode\fR, \fBreset_shell_mode\fR, \fBresetty\fR,
-\fBsavetty\fR, \fBgetsyx\fR, \fBsetsyx\fR, \fBripoffline\fR,
-\fBcurs_set\fR, \fBnapms\fR - low-level \fBcurses\fR routines
+\fBdef_prog_mode\fR,
+\fBdef_shell_mode\fR,
+\fBreset_prog_mode\fR,
+\fBreset_shell_mode\fR,
+\fBresetty\fR,
+\fBsavetty\fR,
+\fBgetsyx\fR,
+\fBsetsyx\fR,
+\fBripoffline\fR,
+\fBcurs_set\fR,
+\fBnapms\fR - low-level \fBcurses\fR routines
+.ad
+.hy
.SH SYNOPSIS
\fB#include <curses.h>\fR
-
+.sp
\fBint def_prog_mode(void);\fR
.br
\fBint def_shell_mode(void);\fR
The following routines give low-level access to various \fBcurses\fR
capabilities. Theses routines typically are used inside library
routines.
-
+.PP
The \fBdef_prog_mode\fR and \fBdef_shell_mode\fR routines save the
current terminal modes as the "program" (in \fBcurses\fR) or "shell"
(not in \fBcurses\fR) state for use by the \fBreset_prog_mode\fR and
\fBreset_shell_mode\fR routines. This is done automatically by
\fBinitscr\fR. There is one such save area for each screen context
allocated by \fBnewterm()\fR.
-
+.PP
The \fBreset_prog_mode\fR and \fBreset_shell_mode\fR routines restore
the terminal to "program" (in \fBcurses\fR) or "shell" (out of
\fBcurses\fR) state. These are done automatically by \fBendwin\fR
and, after an \fBendwin\fR, by \fBdoupdate\fR, so they normally are
not called.
-
+.PP
The \fBresetty\fR and \fBsavetty\fR routines save and restore the
state of the terminal modes. \fBsavetty\fR saves the current state in
a buffer and \fBresetty\fR restores the state to what it was at the
last call to \fBsavetty\fR.
-
+.PP
The \fBgetsyx\fR routine returns the current coordinates of the virtual screen
cursor in \fIy\fR and \fIx\fR. If \fBleaveok\fR is currently \fBTRUE\fR, then
\fB-1\fR,\fB-1\fR is returned. If lines have been removed from the top of the
screen, using \fBripoffline\fR, \fIy\fR and \fIx\fR include these lines;
therefore, \fIy\fR and \fIx\fR should be used only as arguments for
\fBsetsyx\fR.
-
+.PP
The \fBsetsyx\fR routine sets the virtual screen cursor to
\fIy\fR, \fIx\fR. If \fIy\fR and \fIx\fR are both \fB-1\fR, then
\fBleaveok\fR is set. The two routines \fBgetsyx\fR and \fBsetsyx\fR
at the beginning, do its manipulation of its own windows, do a
\fBwnoutrefresh\fR on its windows, call \fBsetsyx\fR, and then call
\fBdoupdate\fR.
-
+.PP
The \fBripoffline\fR routine provides access to the same facility that
\fBslk_init\fR [see \fBcurs_slk\fR(3X)] uses to reduce the size of the
screen. \fBripoffline\fR must be called before \fBinitscr\fR or
accurate and \fBwrefresh\fR or \fBdoupdate\fR must not be called. It
is allowable to call \fBwnoutrefresh\fR during the initialization
routine.
-
+.PP
\fBripoffline\fR can be called up to five times before calling \fBinitscr\fR or
\fBnewterm\fR.
-
+.PP
The \fBcurs_set\fR routine sets the cursor state is set to invisible,
normal, or very visible for \fBvisibility\fR equal to \fB0\fR,
\fB1\fR, or \fB2\fR respectively. If the terminal supports the
\fIvisibility\fR requested, the previous \fIcursor\fR state is
returned; otherwise, \fBERR\fR is returned.
-
+.PP
The \fBnapms\fR routine is used to sleep for \fIms\fR milliseconds.
.SH RETURN VALUE
Except for \fBcurs_set\fR, these routines always return \fBOK\fR.
-\fBcurs_set\fR returns the previous cursor state, or \fBERR\fR if the
+.PP
+\fBcurs_set\fR
+returns the previous cursor state, or \fBERR\fR if the
requested \fIvisibility\fR is not supported.
+.PP
+X/Open defines no error conditions.
+In this implementation
+.RS
+.TP 5
+\fBdef_prog_mode\fR, \fBdef_shell_mode\fR, \fBreset_prog_mode\fR, \fBreset_shell_mode\fR
+return an error
+if the terminal was not initialized, or
+if the I/O call to obtain the terminal settings fails.
+.TP 5
+\fBripoffline\fP
+returns an error if the maximum number of ripped-off lines
+exceeds the maximum (NRIPS = 5).
+.RE
.SH NOTES
Note that \fBgetsyx\fR is a macro, so \fB&\fR is not necessary before
the variables \fIy\fR and \fIx\fR.
-
+.PP
Older SVr4 man pages warn that the return value of \fBcurs_set\fR "is currently
incorrect". This implementation gets it right, but it may be unwise to count
on the correctness of the return value anywhere else.
-
+.PP
Both ncurses and SVr4 will call \fBcurs_set\fR in \fBendwin\fR
if \fBcurs_set\fR
has been called to make the cursor other than normal, i.e., either
.SH PORTABILITY
The functions \fBsetsyx\fR and \fBgetsyx\fR are not described in the XSI
Curses standard, Issue 4. All other functions are as described in XSI Curses.
-
+.PP
The SVr4 documentation describes \fBsetsyx\fR and \fBgetsyx\fR as having return
type int. This is misleading, as they are macros with no documented semantics
for the return value.
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