1996-02-11 23:29:40 +00:00
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.TH curs_initscr 3 ""
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1994-10-07 08:58:58 +00:00
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.SH NAME
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1996-02-11 23:29:40 +00:00
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\fBinitscr\fR, \fBnewterm\fR, \fBendwin\fR,
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\fBisendwin\fR, \fBset_term\fR,
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\fBdelscreen\fR - \fBncurses\fR screen initialization and manipulation routines
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1994-10-07 08:58:58 +00:00
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.SH SYNOPSIS
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\fB#include <ncurses.h>\fR
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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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\fBint 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 \fBncurses\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, or in order to test
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for the presence of given capabilities, \fBnewterm\fR may be called before
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\fBinitscr\fR.
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The initscr code determines the terminal type and initializes all \fBncurses\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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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 ncurses. If
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\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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A program should always call \fBendwin\fR before exiting or escaping from
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\fBncurses\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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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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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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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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Routines that return pointers always return \fBNULL\fR on error.
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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 SEE ALSO
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1996-02-11 23:29:40 +00:00
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\fBncurses\fR(3), \fBcurs_kernel\fR(3), \fBcurs_refresh\fR(3),
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\fBcurs_slk\fR(3), \fBcurs_util\fR(3)
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1994-10-07 08:58:58 +00:00
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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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