199 lines
5.3 KiB
Groff
199 lines
5.3 KiB
Groff
.\" $NetBSD: curses_screen.3,v 1.13 2007/07/13 11:16:11 jdc Exp $
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.\"
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.\" Copyright (c) 2002
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.\" Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
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.\"
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.\" This code is donated to the NetBSD Foundation by the Author.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the Author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\"
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.Dd February 24, 2004
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.Dt CURSES_SCREEN 3
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.Os
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.Sh NAME
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.Nm curses_screen ,
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.Nm newterm ,
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.Nm set_term ,
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.Nm delscreen ,
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.Nm endwin ,
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.Nm initscr ,
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.Nm isendwin ,
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.Nm resizeterm ,
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.Nm setterm
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.Nd curses terminal and screen routines
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.Sh LIBRARY
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.Lb libcurses
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.Sh SYNOPSIS
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.In curses.h
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.Ft SCREEN *
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.Fn newterm "char *type" "FILE *outfd" "FILE *infd"
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.Ft SCREEN *
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.Fn set_term "SCREEN *screen"
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.Ft void
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.Fn delscreen "SCREEN *screen"
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.Ft int
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.Fn endwin "void"
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.Ft WINDOW *
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.Fn initscr "void"
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.Ft bool
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.Fn isendwin "void"
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.Ft int
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.Fn resizeterm "int lines" "int cols"
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.Ft int
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.Fn setterm "char *name"
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.Pp
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.Va extern int LINES ;
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.Pp
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.Va extern int COLS ;
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.Sh DESCRIPTION
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These functions initialize terminals and screens.
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.Pp
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The
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.Fn newterm
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function initialises the curses data structures and pointers ready for
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use by curses.
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The
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.Fa type
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argument points to a
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.Xr termcap 5
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capability name, or it may be
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.Dv NULL
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in which case the TERM environment variable is used.
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The
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.Fa outfd
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and
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.Fa infd
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are the output and input file descriptors for the terminal.
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The
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.Fn newterm
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function must only be called once per terminal.
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.Pp
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The
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.Fn set_term
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function can be used to switch between the screens defined by calling
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.Fn newterm ,
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a pointer to the previous screen structure that was in use will be
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returned on success.
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.Pp
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Calling
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.Fn delscreen
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will destroy the given screen and free all allocated resources.
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.Pp
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Calling
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.Fn endwin
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will end the curses session and restore the saved terminal settings.
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.Pp
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The curses session must be initialised by calling
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.Fn initscr
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which saves the current terminal state and sets up the terminal and
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internal data structures to support the curses application.
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This
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function call must be, with few exceptions, the first Curses library
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call made.
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The exception to this rule is the
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.Fn newterm
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call which may be called prior to
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.Fn initscr .
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The size of the curses screen is determined by checking the
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.Xr tty 4
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size and then the
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.Xr termcap 5
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entries for the terminal type.
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If the environment variables
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.Va LINES
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or
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.Va COLS
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are set, then these will be used instead.
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.Pp
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When either
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.Fn newterm
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or
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.Fn initscr
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are called, the Curses library sets up signal handlers for
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.Dv SIGTSTP
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and
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.Dv SIGWINCH .
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If a signal handler is already installed for
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.Dv SIGWINCH ,
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this will also be called when the Curses library handler is called.
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.Pp
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The
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.Fn isendwin
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function can be used to determine whether or not a refresh of the
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screen has occurred since the last call to
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.Fn endwin .
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.Pp
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The size of the screen may be changed by calling
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.Fn resizeterm
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with the updated number of lines and columns.
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This will resize the curses internal data structures to accommodate the
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changed terminal geometry.
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The application must redraw the screen after a call to
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.Fn resizeterm .
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.Pp
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The
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.Fn setterm
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function sets the terminal type for the current screen to the one
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passed, initialising all the curses internal data structures with
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information related to the named terminal.
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The
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.Fa name
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argument must be a valid name or alias in the
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.Xr termcap 5
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database for this function to succeed.
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.Sh RETURN VALUES
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Functions returning pointers will return
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.Dv NULL
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if an error is detected.
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The functions that return an int will return one of the following
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values:
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.Pp
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.Bl -tag -width ERR -compact
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.It Er OK
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The function completed successfully.
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.It Er ERR
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An error occurred in the function.
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.El
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.Sh SEE ALSO
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.Xr curses_window 3 ,
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.Xr tty 4 ,
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.Xr termcap 5 ,
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.Xr signal 7
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.Sh STANDARDS
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The
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.Nx
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Curses library complies with the X/Open Curses specification, part of the
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Single Unix Specification.
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.Sh HISTORY
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The Curses package appeared in
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.Bx 4.0 .
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The
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.Fn resizeterm
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function is a
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.Em ncurses
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extension to the Curses library and was added in
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.Nx 1.6 .
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