133 lines
6.3 KiB
Plaintext
133 lines
6.3 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 1998-2003,2005 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_initscr.3x,v 1.14 2005/05/15 16:18:01 tom Exp $
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.TH curs_initscr 3X ""
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.na
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.hy 0
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.SH NAME
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\fBinitscr\fR,
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\fBnewterm\fR,
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\fBendwin\fR,
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\fBisendwin\fR,
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\fBset_term\fR,
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\fBdelscreen\fR - \fBcurses\fR screen initialization and manipulation routines
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.ad
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.hy
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.SH SYNOPSIS
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\fB#include <curses.h>\fR
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.sp
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\fBWINDOW *initscr(void);\fR
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.br
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\fBint endwin(void);\fR
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.br
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\fBbool isendwin(void);\fR
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.br
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\fBSCREEN *newterm(char *type, FILE *outfd, FILE *infd);\fR
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.br
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\fBSCREEN *set_term(SCREEN *new);\fR
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.br
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\fBvoid delscreen(SCREEN* sp);\fR
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.br
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.SH DESCRIPTION
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\fBinitscr\fR is normally the first \fBcurses\fR routine to call when
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initializing a program. A few special routines sometimes need to be
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called before it; these are \fBslk_init\fR, \fBfilter\fR, \fBripoffline\fR,
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\fBuse_env\fR. For multiple-terminal applications, \fBnewterm\fR may be
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called before \fBinitscr\fR.
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.PP
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The initscr code determines the terminal type and initializes all \fBcurses\fR
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data structures. \fBinitscr\fR also causes the first call to \fBrefresh\fR to
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clear the screen. If errors occur, \fBinitscr\fR writes an appropriate error
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message to standard error and exits; otherwise, a pointer is returned to
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\fBstdscr\fR.
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.PP
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A program that outputs to more than one terminal should use the \fBnewterm\fR
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routine for each terminal instead of \fBinitscr\fR. A program that needs to
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inspect capabilities, so it can continue to run in a line-oriented mode if the
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terminal cannot support a screen-oriented program, would also use
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\fBnewterm\fR. The routine \fBnewterm\fR should be called once for each
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terminal. It returns a variable of type \fBSCREEN *\fR which should be saved
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as a reference to that terminal. The arguments are the \fItype\fR of the
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terminal to be used in place of \fB$TERM\fR, a file pointer for output to the
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terminal, and another file pointer for input from the terminal (if \fItype\fR
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is \fBNULL\fR, \fB$TERM\fR will be used). The program must also call
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\fBendwin\fR for each terminal being used before exiting from \fBcurses\fR.
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If \fBnewterm\fR is called more than once for the same terminal, the first
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terminal referred to must be the last one for which \fBendwin\fR is called.
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.PP
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A program should always call \fBendwin\fR before exiting or escaping from
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\fBcurses\fR mode temporarily. This routine restores tty modes, moves the
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cursor to the lower left-hand corner of the screen and resets the terminal into
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the proper non-visual mode. Calling \fBrefresh\fR or \fBdoupdate\fR after a
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temporary escape causes the program to resume visual mode.
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.PP
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The \fBisendwin\fR routine returns \fBTRUE\fR if \fBendwin\fR has been
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called without any subsequent calls to \fBwrefresh\fR, and \fBFALSE\fR
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otherwise.
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.PP
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The \fBset_term\fR routine is used to switch between different
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terminals. The screen reference \fBnew\fR becomes the new current
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terminal. The previous terminal is returned by the routine. This is
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the only routine which manipulates \fBSCREEN\fR pointers; all other
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routines affect only the current terminal.
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.PP
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The \fBdelscreen\fR routine frees storage associated with the
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\fBSCREEN\fR data structure. The \fBendwin\fR routine does not do
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this, so \fBdelscreen\fR should be called after \fBendwin\fR if a
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particular \fBSCREEN\fR is no longer needed.
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.SH RETURN VALUE
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\fBendwin\fR returns the integer \fBERR\fR upon failure and \fBOK\fR
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upon successful completion.
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.PP
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Routines that return pointers always return \fBNULL\fR on error.
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.PP
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X/Open defines no error conditions.
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In this implementation
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\fBendwin\fP returns an error if the terminal was not initialized.
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.SH NOTES
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Note that \fBinitscr\fR and \fBnewterm\fR may be macros.
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.SH PORTABILITY
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These functions are described in the XSI Curses standard, Issue 4. It
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specifies that portable applications must not call \fBinitscr\fR more than
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once.
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.PP
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Old versions of curses, e.g., BSD 4.4, may have returned a null pointer
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from \fBinitscr\fR when an error is detected, rather than exiting.
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It is safe but redundant to check the return value of \fBinitscr\fR
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in XSI Curses.
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBcurs_kernel\fR(3X), \fBcurs_refresh\fR(3X),
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\fBcurs_slk\fR(3X), \fBcurs_util\fR(3X)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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