V10/man/man3/termcap.3

.TH TERMCAP 3X
.CT 2 comm_term
.SH NAME
tgetent, tgetnum, tgetflag, tgetstr, tgoto, tputs \(mi device-independent terminal screen control
.SH SYNOPSIS
.2C
.nf
.B char PC;
.B char *BC;
.B char *UP;
.B short ospeed;
.PP
.B tgetent(bp, name)
.B char bp[1024], *name;
.PP
.B tgetnum(id)
.B char *id;
.PP
.B tgetflag(id)
.B char *id;
.PP
.B char *
.B tgetstr(id, area)
.B char *id, **area;
.PP
.B char *
.B tgoto(cm, destcol, destline)
.B char *cm;
.PP
.B tputs(cp, affcnt, outc)
.B char *cp;
.B int (*outc)();
.fi
.1C
.SH DESCRIPTION
These functions are loaded by option
.B -ltermcap
of
.IR ld (1).
They extract and use capabilities from the terminal capability data
base
.IR termcap (5).
These are low level routines;
see
.IR curses (3)
for a higher level package.
.PP
.I Tgetent
extracts the entry for terminal
.I name
into the buffer at
.I bp.
.I Bp
should be a character buffer of size
1024 and must be retained through all subsequent calls
to
.I tgetnum,
.I tgetflag,
and
.I tgetstr.
.I Tgetent
returns \-1
if it cannot open the
.I termcap
file,
0
if the terminal name given does not have an entry,
and 1
if all goes well.
It will look in the environment for a
.L TERMCAP
variable.
If found, and the value does not begin with a slash,
and the terminal type
.I name
is the same as the value of the environment variable
.LR TERM ,
the
.L TERMCAP
string is used instead of reading the termcap file.
If it does begin with a slash, the string is used as a path name rather than
.FR /etc/termcap .
.PP
.I Tgetnum
gets the numeric value of capability
.I id,
returning \-1
if is not given for the terminal.
.I Tgetflag
returns 1
if the specified capability is present in
the terminal's entry,
0
if it is not.
.I Tgetstr
gets the string value of capability
.I id,
placing it in the buffer at
.I *area,
advancing the
.I area
pointer.
It decodes the abbreviations for this field described in
.IR termcap (5),
except for cursor addressing and padding information.
.PP
.I Tgoto
returns a cursor addressing string decoded from
.B cm
to go to column
.I destcol
in line
.I destline.
It uses the external variables
.B UP
(from the
.L up
capability)
and
.B BC
(if
.L bc
is given rather than
.LR bs )
if necessary to avoid placing
.LR en ,
.LR ^D ,
or
.L ^@
in the returned string.
(Programs which call
.I tgoto
should be sure to turn off the
.B XTABS
bit(s),
since
.I tgoto
may now output a tab.
Note that programs using termcap should in general turn off
.B XTABS
anyway since some terminals use \fL^I\fP for other functions,
such as nondestructive space.)
If a
.B %
sequence is given which is not understood, then
.I tgoto
returns
.LR `OOPS' .
.PP
.I Tputs
decodes the leading padding information of the string
.I cp;
.I affcnt
gives the number of lines affected by the operation, or 1 if this is
not applicable;
.I outc
is a routine which is called with each character in turn.
The external variable
.I ospeed
should contain the output speed of the terminal as in
.IR tty (4).
The external variable
.B PC
should contain a pad character to be used (from the
.L pc
capability)
if a null
.RB ( ^@ )
is inappropriate.
.SH FILES
.F /etc/termcap
.SH SEE ALSO
.IR vi (1), 
.IR curses (3), 
.IR termcap (5)