NetBSD/lib/libcurses/PSD.doc/fns.doc

.\"	$NetBSD: fns.doc,v 1.4 1998/01/09 04:12:10 perry Exp $
.\"
.\" Copyright (c) 1992, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
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.\"    may be used to endorse or promote products derived from this software
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.\"     @(#)fns.doc	8.2 (Berkeley) 6/1/94
.\"
.Ds
.Fn addch "char ch" \(dg
.De
Add the character
.Vn ch
on the window
at the current \*y.
If the character is a newline
(\'\en\')
the line will be cleared to the end,
and the current \*y will be changed to the
beginning off the next line
if newline mapping is on,
or to the next line at the same x co-ordinate
if it is off.
A return
(\'\er\')
will move to the beginning of the line on the window.
Tabs
(\'\et\')
will be expanded into spaces
in the normal tabstop positions of
every eight characters.
\*(Es
.Ds
.Fn addstr "char *str" \(dg
.De
Add the string pointed to by
.Vn str
on the window at the current \*y.
\*(Es
In this case, it will put on as much as it can.
.Ds
.Fn baudrate "" \(dg
.De
Returns the output baud rate of the terminal.
This is a system dependent constant
(defined in
.b <sys/tty.h>
on BSD systems,
which is included by
.b <curses.h> ).
.Ds
.Fn box "WINDOW win" "char vert" "char hor"
.De
.Pp
Draws a box around the window using
.Vn vert
as the character for drawing the vertical sides, and
.Vn hor
for drawing the horizontal lines.
If scrolling is not allowed,
and the window encompasses the lower right-hand corner of the terminal,
the corners are left blank to avoid a scroll.
.Ds
.Fn cbreak "" \(dg
.De
Set or the terminal to cbreak mode.
.Ds
.Fn clear "" \(dg
.De
Resets the entire window to blanks.
If
.Vn win
is a screen,
this sets the clear flag,
which will cause a clear-screen sequence to be sent
on the next
.Fn refresh
call.
This also moves the current \*y
to (0\*,0).
.Ds
.Fn clearok "WINDOW *scr" "int boolf" \(dg
.De
Sets the clear flag for the screen
.Vn scr .
If
.Vn boolf
is non-zero,
this will force a clear-screen to be printed on the next
.Fn refresh ,
or stop it from doing so if
.Vn boolf
is 0.
This only works on screens,
and,
unlike
.Fn clear ,
does not alter the contents of the screen.
If
.Vn scr
is
.Vn curscr ,
the next
.Fn refresh
call will cause a clear-screen,
even if the window passed to
.Fn refresh
is not a screen.
.Ds
.Fn clrtobot "" \(dg
.De
Wipes the window clear from the current \*y to the bottom.
This does not force a clear-screen sequence on the next refresh
under any circumstances.
\*(Nm
.Ds
.Fn clrtoeol "" \(dg
.De
Wipes the window clear from the current \*y to the end of the line.
\*(Nm
.Ds
.Fn crmode "" \(dg
.De
Identical to 
.Fn cbreak .
The misnamed macro
.Fn crmode
and
.Fn nocrmode
is retained for backwards compatibility
with ealier versions of the library.
.Ds
.Fn delch ""
.De
Delete the character at the current \*y.
Each character after it on the line shifts to the left,
and the last character becomes blank.
.Ds
.Fn deleteln ""
.De
Delete the current line.
Every line below the current one will move up,
and the bottom line will become blank.
The current \*y will remain unchanged.
.Ds
.Fn delwin "WINDOW *win"
.De
Deletes the window from existence.
All resources are freed for future use by
.b calloc (3).
If a window has a
.Fn subwin
allocated window inside of it,
deleting the outer window
the subwindow is not affected,
even though this does invalidate it.
Therefore,
subwindows should be deleted before their
outer windows are.
.Ds
.Fn echo "" \(dg
.De
Sets the terminal to echo characters.
.Ds
.Fn endwin ""
.De
Finish up window routines before exit.
This restores the terminal to the state it was before
.Fn initscr
(or
.Fn gettmode
and
.Fn setterm )
was called.
It should always be called before exiting and before the final calls to 
.Fn delwin .
It does not exit.
This is especially useful for resetting tty stats
when trapping rubouts via
.b signal (2).
.Ds
.Fn erase "" \(dg
.De
Erases the window to blanks without setting the clear flag.
This is analagous to
.Fn clear ,
except that it never causes a clear-screen sequence to be generated
on a
.Fn refresh .
\*(Nm
.Ds
.Fn erasechar "" \(dg
.De
Returns the erase character
for the terminal,
.i i.e. ,
the character used by the user to erase a single character from the input.
.Ds
.Fn flushok "WINDOW *win" "int boolf"
.De
Normally,
.Fn refresh
.Fn fflush 's
.Vn stdout
when it is finished.
.Fn flushok
allows you to control this.
if
.Vn boolf
is non-zero
(\c
.i i.e. ,
non-zero)
it will do the
.Fn fflush ,
otherwise it will not.
.Ds
.Fn getch "" \(dg
.De
Gets a character from the terminal and (if necessary)
echos it on the window.
\*(Es
Otherwise, the character gotten is returned.
If
.i noecho
has been set, then the window is left unaltered.
In order to retain control of the terminal,
it is necessary to have one of
.i noecho ,
.i cbreak ,
or
.i rawmode
set.
If you do not set one,
whatever routine you call to read characters will set
.i cbreak
for you,
and then reset to the original mode when finished.
.Ds
.Fn getstr "char *str" \(dg
.De
Get a string through the window
and put it in the location pointed to by
.Vn str ,
which is assumed to be large enough to handle it.
It sets tty modes if necessary,
and then calls
.Fn getch
(or
.Fn wgetch )
to get the characters needed to fill in the string
until a newline or EOF is encountered.
The newline stripped off the string.
\*(Es
.Ds
.Fn gettmode ""
.De
Get the tty stats.
This is normally called by
.Fn initscr .
.Ds
.Fn getyx "WINDOW *win" "int y" "int x"
.De
Puts the current \*y of
.Vn win
in the variables
.Vn y
and
.Vn x .
Since it is a macro,
not a function,
you do not pass the address
of
.Vn y
and
.Vn x .
.Ds
.Fn idlok "WINDOW *win" "int boolf"
.De
Reserved for future use.
This will eventually signal to
.Fn refresh
that it is all right to use the insert and delete line sequences
when updating the window.
.ne 1i
.Ds
.Fn inch "" \(dg
.De
Returns the character at the current position on the given window.
This does not make any changes to the window.
.Ds
.Fn initscr ""
.De
Initialize the screen routines.
This must be called before any of the screen routines are used.
It initializes the terminal-type data and such,
and without it none of the routines can operate.
If standard input is not a tty,
it sets the specifications to the terminal
whose name is pointed to by
.Vn Def\*_term
(initially "dumb").
If the boolean
.Vn My\*_term
is non-zero,
.Vn Def\*_term
is always used.
If the system supports the
.b TIOCGWINSZ
.i ioctl(2)
call,
it is used to get the number of lines and columns for the terminal,
otherwise it is taken from the
.b termcap
description.
.Ds
.Fn insch "char c"
.De
Insert
.Vn c
at the current \*y
Each character after it shifts to the right,
and the last character disappears.
\*(Es
.Ds
.Fn insertln ""
.De
Insert a line above the current one.
Every line below the current line
will be shifted down,
and the bottom line will disappear.
The current line will become blank,
and the current \*y will remain unchanged.
.Ds
.Fn killchar "" \(dg
.De
Returns the line kill character
for the terminal,
.i i.e. ,
the character used by the user to erase an entire line from the input.
.Ds
.Fn leaveok "WINDOW *win" "int boolf" \(dg
.De
Sets the boolean flag for leaving the cursor after the last change.
If
.Vn boolf
is non-zero,
the cursor will be left after the last update on the terminal,
and the current \*y for
.Vn win
will be changed accordingly.
If 
.Vn boolf
 is 0 the cursor will be moved to the current \*y.
This flag
(initially 0)
retains its value until changed by the user.
.Ds
.Fn move "int y" "int x"
.De
Change the current \*y of the window to
.Vn y\*,x ). (
\*(Es
.Ds
.Fn mvcur "int lasty" "int lastx" "int newy" "int newx"
.De
Moves the terminal's cursor from
.Vn lasty\*,lastx ) (
to
.Vn newy\*,newx ) (
in an approximation of optimal fashion.
This routine uses the functions borrowed from
.i ex
version 2.6.
It is possible to use this optimization
without the benefit of the screen routines.
With the screen routines, this should not be called by the user.
.Fn move
and
.Fn refresh
should be used to move the cursor position,
so that the routines know what's going on.
.Ds
.Fn mvprintw "int y" "int x" "const char *fmt" "..."
.De
Equivalent to:
.(l
move(y, x);
printw(fmt, ...);
.)l
.Ds 
.Fn mvscanw "int y" "int x" "const char *fmt" "..."
.De
Equivalent to:
.(l
move(y, x);
scanw(fmt, ...);
.)l
.Ds
.Fn mvwin "WINDOW *win" "int y" "int x"
.De
Move the home position of the window
.Vn win
from its current starting coordinates
to
.Vn y\*,x ). (
If that would put part or all of the window
off the edge of the terminal screen,
.Fn mvwin
returns ERR and does not change anything.
For subwindows,
.Fn mvwin
also returns ERR if you attempt to move it off its main window.
If you move a main window,
all subwindows are moved along with it.
.Ds
.Fn mvwprintw "WINDOW *win" "int y" "int x" "const char *fmt" "..."
.De
Equivalent to:
.(l
wmove(win, y, x);
printw(fmt, ...);
.)l
.Ds
.Fn mvwscanw "WINDOW *win" "int y" "int x" "const char *fmt" "..."
.De
Equivalent to:
.(l
wmove(win, y, x);
scanw(fmt, ...);
.)l
.Ds
.Ft "WINDOW *"
.Fn newwin "int lines" "int cols" "int begin_y" "int begin_x" 
.De
Create a new window with
.Vn lines
lines and
.Vn cols
columns starting at position
.Vn begin\*_y\*,begin\*_x ). (
If either
.Vn lines
or
.Vn cols
is 0 (zero),
that dimension will be set to
.Vn "LINES \- begin\*_y" ) (
or
.Vn "COLS \- begin\*_x" ) (
respectively.
Thus, to get a new window of dimensions
.Vn LINES
\(mu
.Vn COLS ,
use
.Fn newwin 0 0 0 0 .
.Ds
.Fn nl "" \(dg
.De
Set the terminal to nl mode,
.i i.e. ,
start/stop the system from mapping
.b <RETURN>
to
.b <LINE-FEED> .
If the mapping is not done,
.Fn refresh
can do more optimization,
so it is recommended, but not required, to turn it off.
.Ds
.Fn nocbreak "" \(dg
.De
Unset the terminal from cbreak mode.
.Ds
.Fn nocrmode "" \(dg
.De
Identical to
.Fn nocbreak .
The misnamed macro
.Fn nocrmode
is retained for backwards compatibility
with ealier versions of the library.
.Ds
.Fn noecho "" \(dg
.De
Turn echoing of characters off.
.Ds
.Fn nonl "" \(dg
.De
Unset the terminal to from nl mode.  See 
.Fn nl .
.ne 1i
.Ds
.Fn noraw "" \(dg
.De
Unset the terminal from raw mode.  See 
.Fn raw .
.Ds
.Fn overlay "WINDOW *win1" "WINDOW *win2"
.De
Overlay
.Vn win1
on
.Vn win2 .
The contents of
.Vn win1 ,
insofar as they fit,
are placed on
.Vn win2
at their starting \*y.
This is done non-destructively,
i.e., blanks on
.Vn win1
leave the contents of the space on
.Vn win2
untouched.  Note that all non-blank characters are overwritten 
destructively in the overlay.
.Ds
.Fn overwrite "WINDOW *win1" "WINDOW *win2"
.De
Overwrite
.Vn win1
on
.Vn win2 .
The contents of
.Vn win1 ,
insofar as they fit,
are placed on
.Vn win2
at their starting \*y.
This is done destructively,
.i i.e. ,
blanks on
.Vn win1
become blank on
.Vn win2 .
.Ds
.Fn printw "char *fmt" "..."
.De
Performs a
.Fn printf
on the window starting at the current \*y.
It uses
.Fn addstr
to add the string on the window.
It is often advisable to use the field width options of
.Fn printf
to avoid leaving things on the window from earlier calls.
\*(Es
.Ds
.Fn raw "" \(dg
.De
Set the terminal to raw mode.
On version 7
.Un \**
.(f
\**
.Un
is a trademark of Unix System Laboratories.
.)f
this also turns off newline mapping
(see
.Fn nl ).
.Ds
.Fn refresh "" \(dg
.De
Synchronize the terminal screen with the desired window.
If the window is not a screen,
only that part covered by it is updated.
\*(Es
In this case, it will update whatever it can
without causing the scroll.
.sp
As a special case,
if
.Fn wrefresh
is called with the window
.Vn curscr
the screen is cleared
and repainted as it is currently.
This is very useful for allowing the redrawing of the screen
when the user has garbage dumped on his terminal.
.Ds
.Fn resetty "" \(dg
.De
.Fn resetty
restores them to what
.Fn savetty
stored.
These functions are performed automatically by
.Fn initscr
and
.Fn endwin .  
This function should not be used by the user.
.Ds
.Fn savetty "" \(dg
.De
.Fn savetty
saves the current tty characteristic flags. See
.Fn resetty .
This function should not be used by the user.
.Ds
.Fn scanw "char *fmt" "..."
.De
Perform a
.Fn scanf
through the window using
.Vn fmt .
It does this using consecutive calls to 
.Fn getch
(or
.Fn wgetch ).
\*(Es
.ne 1i
.Ds
.Fn scroll "WINDOW *win"
.De
Scroll the window upward one line.
This is normally not used by the user.
.Ds
.Fn scrollok "WINDOW *win" "int boolf" \(dg
.De
Set the scroll flag for the given window.
If
.Vn boolf
is 0, scrolling is not allowed.
This is its default setting.
.Ds
.Fn standend "" \(dg
.De
End standout mode initiated by
.Fn standout .
.Ds
.Fn standout "" \(dg
.De
Causes any characters added to the window
to be put in standout mode on the terminal
(if it has that capability).
.Ds
.Ft "WINDOW *"
.Fn subwin "WINDOW *win" "int lines" "int cols" "int begin_y" "int begin_x"
.De
Create a new window with
.Vn lines
lines and
.Vn cols
columns starting at position
.Vn begin\*_y\*,begin\*_x ) (
inside the window
.i win .
This means that any change made to either window
in the area covered
by the subwindow will be made on both windows.
.Vn begin\*_y\*,begin\*_x
are specified relative to the overall screen,
not the relative (0\*,0) of
.Vn win .
If either
.Vn lines
or
.Vn cols
is 0 (zero),
that dimension will be set to
.Vn "LINES \- begin\*_y" ) (
or
.Vn "COLS \- begin\*_x" ) (
respectively.
.Ds
.Fn touchline "WINDOW *win" "int y" "int startx" "int endx"
.De
This function performs a function similar to
.Fn touchwin
on a single line.
It marks the first change for the given line
to be
.Vn startx ,
if it is before the current first change mark,
and
the last change mark is set to be
.Vn endx
if it is currently less than
.Vn endx .
.Ds
.Fn touchoverlap "WINDOW *win1" "WINDOW *win2"
.De
Touch the window
.Vn win2
in the area which overlaps with
.Vn win1 .
If they do not overlap,
no changes are made.
.Ds
.Fn touchwin "WINDOW *win"
.De
Make it appear that the every location on the window
has been changed.
This is usually only needed for refreshes with overlapping windows.
.Ds
.Fn tstp
.De
This function
will save the current tty state
and then put the process to sleep.
When the process gets restarted,
it restores the saved tty state
and then calls
.Fn wrefresh "curscr"
to redraw the screen.
.Fn Initscr
sets the signal
SIGTSTP
to trap to this routine.
.Ds
.Fn unctrl "char *ch" \(dg
.De
Returns a string which is an ASCII representation of
.Vn ch .  
Characters are 8 bits long.
.Ds
.Fn unctrllen "char *ch" \(dg
.De
Returns the length of the ASCII representation of 
.Vn ch .
.ne 1i
.Ds
.Fn vwprintw "WINDOW *win" "const char *fmt" "va_list ap"
.De
Identical to 
.Fn printw 
except that it takes both a window specification and a pointer to a variable
length argument list.
.Ds
.Fn vwscanw "WINDOW *win" "const char *fmt" "va_list ap"
.De
Identical to 
.Fn scanw
except that it takes both a window specification and a pointer to a variable
length argument list.
.Ds
.Fn waddbytes "WINDOW *win" "char *str" "int len"
.De
This function is the low level character output function.  
.Vn Len
characters of the string
.Vn str
are output to the current \*y position of the window specified by
.Vn win.
.sp 2
.pp
\fIThe following functions differ from the standard functions only in their 
specification of a window, rather than the use of the default
.Vn stdscr.\fP
.Ds
.Fn waddch "WINDOW *win" "char ch" 
.Fn waddstr "WINDOW *win" "char *str" 
.Fn wclear "WINDOW *win"  
.Fn wclrtobot "WINDOW *win"  
.Fn wclrtoeol "WINDOW *win"  
.Fn wdelch "WINDOW *win"  
.Fn wdeleteln "WINDOW *win" 
.Fn werase "WINDOW *win" 
.Fn wgetch "WINDOW *win" 
.Fn wgetstr "WINDOW *win" "char *str" 
.Fn winch "WINDOW *win" \(dg
.Fn winsch "WINDOW *win" "char c" 
.Fn winsertln "WINDOW *win" 
.Fn wmove "WINDOW *win" "int y" int x" 
.Fn wprintw "WINDOW *win" "char *fmt" "..." 
.Fn wrefresh "WINDOW *win" 
.Fn wscanw "WINDOW *win" "char *fmt" "..." 
.Fn wstandend "WINDOW *win" 
.Fn wstandout "WINDOW *win"
.Dg