term(4) Kernel Interfaces Manual term(4)
NAME
term - Terminal driver tables for nroff
DESCRIPTION
The nroff(1) command uses driver tables to customize its output for various types of output devices. These driver tables are written as C
programs and compiled and installed in /usr/share/lib/term/tabname. The name specifier is the name of a terminal type as used with nroff
-Tname. The structure of the tables is as follows:
#define INCH 240 struct {
int bset;
int breset;
int Hor;
int Vert;
int Newline;
int Char;
int Em;
int Halfline;
int Adj;
char *twinit;
char *twrest;
char *twnl;
char *hlr;
char *hlf;
char *flr;
char *bdon;
char *bdoff;
char *ploton;
char *plotoff;
char *up;
char *down;
char *right;
char *left;
char *codetab[256-32];
char *zzz; } t;
The fields have the following meanings: Bits to set in the c_oflag field of the termio structure before output. For further information,
see tty(7). Bits to reset in the c_oflag field of the termio structure before output. Horizontal resolution in fractions of an inch.
Vertical resolution in fractions of an inch. Space moved by a newline (linefeed) character in fractions of an inch. Quantum of character
sizes in fractions of an inch (that is, a character is a multiple of Char units wide). Size of an em in fractions of an inch. Space moved
by a half-linefeed (or half-reverse-linefeed) character in fractions of an inch. Quantum of white space in fractions of an inch (that is,
white spaces are a multiple of Adj units wide).
Note: if this value is less than the size of the space character (in units of Char; see the following fields for how the sizes of
characters are defined), nroff outputs fractional spaces using plot mode. Also, if nroff is used with the -e flag, it sets Adj to
equal Hor. The set of characters used to initialize the terminal in a mode suitable for nroff The set of characters used to restore
the terminal to normal mode. The set of characters used to move down one line. The set of characters used to move up one-half
line. The set of characters used to move down one-half line. The set of characters used to move up one line. The set of charac-
ters used to turn on hardware boldface mode, if any. The set of characters used to turn off hardware boldface mode, if any. The
set of characters used to turn on hardware italics mode, if any. The set of characters used to turn off hardware italics mode, if
any. The set of characters used to turn on hardware plot mode (for Diablo type mechanisms), if any. The set of characters used to
turn off hardware plot mode (for Diablo type mechanisms), if any. The set of characters used to move up one resolution unit (Vert)
in plot mode, if any. The set of characters used to move down one resolution unit (Vert) in plot mode, if any. The set of charac-
ters used to move right one resolution unit (Hor) in plot mode, if any. The set of characters used to move left one resolution unit
(Hor) in plot mode, if any. Definition of characters needed to print an nroff character on the terminal. The first byte is the
number of character units (Char) needed to hold the character; that is, `` 01'' is one unit wide, `` 02'' is two units wide, and
so on. The high-order bit (0200) is on if the character is to be underlined in underline mode (.ul). The rest of the bytes are the
characters used to produce the character in question. If the character has the sign (0200) bit on, it is a code to move the termi-
nal in plot mode. It is encoded as follows: Vertical motion Horizontal motion Negative (up or left) motion Positive (down or right)
motion Number of such motions to make A zero terminator at the end.
All quantities that are in units of fractions of an inch should be expressed as INCH*num/denom, where num and denom are respectively the
numerator and denominator of the fraction; that is, 1/48 of an inch would be written as ``INCH1/48''.
If any sequence of characters does not pertain to the output device, that sequence should be given as a null string.
The source code for the terminal name is in /usr/share/lib/term/tabname. When a new terminal type is added, the makefile Makefile.install
in that directory should be updated.
Building New nroff Drivers
The /usr/share/lib/term/mktab.o object module is an nroff compiler-independent driver table generator tool. It is intended to be used as
follows: cc -o /tmp/mktab tabxxx.c mktab.o, /tmp/mktab > tabxx
Default nroff Drivers
The following nroff drivers are provided: Dumb 10-pitch printer with no halfline or upline capability. Generic crt terminal (linked to
lpr). LN03S ASCII printer. VT100 crt terminal. Default pseudo-printer device for the man(1) and catman(8) commands. NOTE: The lp
driver as supplied by Compaq is linked to the vt100 device. Your system administrator can change the definition of lp to another device.
FILES
Driver tables Source file for the driver tables
RELATED INFORMATION
tty(7) delim off
term(4)