116 lines
4.7 KiB
Groff
116 lines
4.7 KiB
Groff
.TH curs_kernel 3X ""
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.SH NAME
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\fBcurs_kernel\fR: \fBdef_prog_mode\fR, \fBdef_shell_mode\fR,
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\fBreset_prog_mode\fR, \fBreset_shell_mode\fR, \fBresetty\fR,
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\fBsavetty\fR, \fBgetsyx\fR, \fBsetsyx\fR, \fBripoffline\fR,
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\fBcurs_set\fR, \fBnapms\fR - low-level \fBncurses\fR routines
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.SH SYNOPSIS
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\fB#include <ncurses.h>\fR
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\fBint def_prog_mode(void);\fR
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.br
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\fBint def_shell_mode(void);\fR
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.br
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\fBint reset_prog_mode(void);\fR
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.br
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\fBint reset_shell_mode(void);\fR
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.br
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\fBint resetty(void);\fR
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.br
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\fBint savetty(void);\fR
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.br
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\fBint getsyx(int y, int x);\fR
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.br
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\fBint setsyx(int y, int x);\fR
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.br
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\fBint ripoffline(int line, int (*init)(WINDOW *, int));\fR
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.br
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\fBint curs_set(int visibility);\fR
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.br
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\fBint napms(int ms);\fR
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.br
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.SH DESCRIPTION
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The following routines give low-level access to various \fBncurses\fR
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capabilities. Theses routines typically are used inside library
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routines.
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The \fBdef_prog_mode\fR and \fBdef_shell_mode\fR routines save the
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current terminal modes as the "program" (in \fBncurses\fR) or "shell"
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(not in \fBncurses\fR) state for use by the \fBreset_prog_mode\fR and
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\fBreset_shell_mode\fR routines. This is done automatically by
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\fBinitscr\fR.
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The \fBreset_prog_mode\fR and \fBreset_shell_mode\fR routines restore
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the terminal to "program" (in \fBncurses\fR) or "shell" (out of
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\fBncurses\fR) state. These are done automatically by \fBendwin\fR
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and, after an \fBendwin\fR, by \fBdoupdate\fR, so they normally are
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not called.
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The \fBresetty\fR and \fBsavetty\fR routines save and restore the
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state of the terminal modes. \fBsavetty\fR saves the current state in
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a buffer and \fBresetty\fR restores the state to what it was at the
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last call to \fBsavetty\fR.
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With the \fBgetsyx\fR routine, the current coordinates of the virtual
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screen cursor are returned in \fIy\fR and \fIx\fR. If \fBleaveok\fR
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is currently \fBTRUE\fR, then \fB-1\fR,\fB-1\fR is returned. If lines
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have been removed from the top of the screen, using \fBripoffline\fR,
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\fIy\fR and \fIx\fR include these lines; therefore, \fIy\fR and
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\fIx\fR should be used only as arguments for \fBsetsyx\fR.
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With the \fBsetsyx\fR routine, the virtual screen cursor is set to
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\fIy\fR, \fIx\fR. If \fIy\fR and \fIx\fR are both \fB-1\fR, then
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\fBleaveok\fR is set. The two routines \fBgetsyx\fR and \fBsetsyx\fR
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are designed to be used by a library routine, which manipulates
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\fBncurses\fR windows but does not want to change the current position
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of the program's cursor. The library routine would call \fBgetsyx\fR
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at the beginning, do its manipulation of its own windows, do a
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\fBwnoutrefresh\fR on its windows, call \fBsetsyx\fR, and then call
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\fBdoupdate\fR.
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The \fBripoffline\fR routine provides access to the same facility that
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\fBslk_init\fR [see curs_slk(3X)] uses to reduce the size of the
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screen. \fBripoffline\fR must be called before \fBinitscr\fR or
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\fBnewterm\fR is called. If \fIline\fR is positive, a line is removed
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from the top of \fBstdscr\fR; if \fIline\fR is negative, a line is
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removed from the bottom. When this is done inside \fBinitscr\fR, the
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routine \fBinit\fR (supplied by the user) is called with two
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arguments: a window pointer to the one-line window that has been
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allocated and an integer with the number of columns in the window.
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Inside this initialization routine, the integer variables \fBLINES\fR
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and \fBCOLS\fR (defined in \fB<ncurses.h>\fR) are not guaranteed to be
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accurate and \fBwrefresh\fR or \fBdoupdate\fR must not be called. It
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is allowable to call \fBwnoutrefresh\fR during the initialization
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routine.
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\fBripoffline\fR can be called up to five times before calling \fBinitscr\fR or
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\fBnewterm\fR.
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The \fBcurs_set\fR routine sets the cursor state is set to invisible,
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normal, or very visible for \fBvisibility\fR equal to \fB0\fR,
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\fB1\fR, or \fB2\fR respectively. If the terminal supports the
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\fIvisibility\fR requested, the previous \fIcursor\fR state is
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returned; otherwise, \fBERR\fR is returned.
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The \fBnapms\fR routine is used to sleep for \fIms\fR milliseconds.
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.SH RETURN VALUE
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Except for \fBcurs_set\fR, these routines always return \fBOK\fR.
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\fBcurs_set\fR returns the previous cursor state, or \fBERR\fR if the
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requested \fIvisibility\fR is not supported.
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.SH NOTES
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Note that \fBgetsyx\fR is a macro, so \fB&\fR is not necessary before
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the variables \fIy\fR and \fIx\fR.
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The SVr4 man pages warn that the return value of \fBcurs_set\fR "is currently
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incorrect". This implementation gets it right, but it may be unwise to count
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on the correctness of the return value anywhere else.
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.SH SEE ALSO
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\fBncurses\fR(3X), \fBcurs_initscr\fR(3X), \fBcurs_outopts\fR(3X), \fBcurs_refresh\fR(3X),
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\fBcurs_scr_dump\fR(3X), \fBcurs_slk\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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