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term

Section: Devices and Network Interfaces (4)
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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 characters 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 characters 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, ``\001'' is one unit wide, ``\002'' 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 terminal 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 by Digital Equipment Corporation: Dumb 10-pitch printer with no halfline or upline capability. Generic crt terminal (linked to lpr). Digital Equipment Corporation LN03S ASCII printer. Digital Equipment Corporation VT100 crt terminal. Default pseudo-printer device for the man(1) and catman(8) commands. NOTE: the lp driver as supplied by Digital 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


 

Index

NAME
DESCRIPTION
Building New nroff Drivers
Default nroff Drivers
FILES
RELATED INFORMATION

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Time: 02:40:07 GMT, October 02, 2010