term(4) term(4)
NAME
term - format of compiled term file
SYNOPSIS
/usr/share/lib/terminfo/?/*
DESCRIPTION
Compiled terminfo(4) descriptions are placed under the directory
/usr/share/lib/terminfo. In order to avoid a linear search of a huge
UNIX system directory, a two-level scheme is used:
/usr/share/lib/terminfo/c/name where name is the name of the
terminal, and c is the first character of name. Thus, att4425 can be
found in the file /usr/share/lib/terminfo/a/att4425. Synonyms for
the same terminal are implemented by multiple links to the same
compiled file.
The format has been chosen so that it is the same on all hardware.
An 8-bit byte is assumed, but no assumptions about byte ordering or
sign extension are made. Thus, these binary terminfo files can be
transported to other hardware with 8-bit bytes.
Short integers are stored in two 8-bit bytes. The first byte
contains the least significant 8 bits of the value, and the second
byte contains the most significant 8 bits. (Thus, the value
represented is 256*second+first.) The value -1 is represented by
0377,0377, and the value -2 is represented by 0376,0377; other
negative values are illegal. The -1 generally means that a
capability is missing from this terminal. The -2 means that the
capability has been cancelled in the terminfo source and also is to
be considered missing.
The compiled file is created from the source file descriptions of the
terminals (see the -I option of infocmp) by using the terminfo
compiler, tic, and read by the routine setupterm [see curses(3X).]
The file is divided into six parts in the following order: the
header, terminal names, boolean flags, numbers, strings, and string
table.
The header section begins the file. This section contains six short
integers in the format described below. These integers are (1) the
magic number (octal 0432); (2) the size, in bytes, of the names
section; (3) the number of bytes in the boolean section; (4) the
number of short integers in the numbers section; (5) the number of
offsets (short integers) in the strings section; (6) the size, in
bytes, of the string table.
The terminal names section comes next. It contains the first line of
the terminfo description, listing the various names for the terminal,
separated by the bar ( | ) character (see term(5)). The section is
terminated with an ASCII NUL character.
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term(4) term(4)
The boolean flags have one byte for each flag. This byte is either 0
or 1 as the flag is present or absent. The value of 2 means that the
flag has been cancelled. The capabilities are in the same order as
the file <term.h>.
Between the boolean section and the number section, a null byte is
inserted, if necessary, to ensure that the number section begins on
an even byte offset. All short integers are aligned on a short word
boundary.
The numbers section is similar to the boolean flags section. Each
capability takes up two bytes, and is stored as a short integer. If
the value represented is -1 or -2, the capability is taken to be
missing.
The strings section is also similar. Each capability is stored as a
short integer, in the format above. A value of -1 or -2 means the
capability is missing. Otherwise, the value is taken as an offset
from the beginning of the string table. Special characters in ^X or
\c notation are stored in their interpreted form, not the printing
representation. Padding information ($<nn>) and parameter
information (%x) are stored intact in uninterpreted form.
The final section is the string table. It contains all the values of
string capabilities referenced in the string section. Each string is
null terminated.
Note that it is possible for setupterm to expect a different set of
capabilities than are actually present in the file. Either the
database may have been updated since setupterm has been recompiled
(resulting in extra unrecognized entries in the file) or the program
may have been recompiled more recently than the database was updated
(resulting in missing entries). The routine setupterm must be
prepared for both possibilities-this is why the numbers and sizes are
included. Also, new capabilities must always be added at the end of
the lists of boolean, number, and string capabilities.
As an example, here is terminal information on the AT&T Model 37 KSR
terminal as output by the infocmp -I tty37 command:
37|tty37|AT&T model 37 teletype,
hc, os, xon,
bel=^G, cr=\r, cub1=\b, cud1=\n, cuu1=\E7, hd=\E9,
hu=\E8, ind=\n,
And here is an octal dump of the term file, produced by the od -c
/usr/share/lib/terminfo/t/tty37 command:
0000000 032 001 \0 032 \0 013 \0 021 001 3 \0 3 7 | t
0000020 t y 3 7 | A T & T m o d e l
0000040 3 7 t e l e t y p e \0 \0 \0 \0 \0
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term(4) term(4)
0000060 \0 \0 \0 001 \0 \0 \0 \0 \0 \0 \0 001 \0 \0 \0 \0
0000100 001 \0 \0 \0 \0 \0 377 377 377 377 377 377 377 377 377 377
0000120 377 377 377 377 377 377 377 377 377 377 377 377 377 377 & \0
0000140 \0 377 377 377 377 377 377 377 377 377 377 377 377 377 377
0000160 377 377 " \0 377 377 377 377 ( \0 377 377 377 377 377 377
0000200 377 377 0 \0 377 377 377 377 377 377 377 377 - \0 377 377
0000220 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377
*
0000520 377 377 377 377 377 377 377 377 377 377 377 377 377 377 $ \0
0000540 377 377 377 377 377 377 377 377 377 377 377 377 377 377 * \0
0000560 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377
*
0001160 377 377 377 377 377 377 377 377 377 377 377 377 377 377 3 7
0001200 | t t y 3 7 | A T & T m o d e
0001220 l 3 7 t e l e t y p e \0 \r \0
0001240 \n \0 \n \0 007 \0 \b \0 033 8 \0 033 9 \0 033 7
0001260 \0 \0
0001261
Some limitations: total compiled entries cannot exceed 4096 bytes;
all entries in the name field cannot exceed 128 bytes.
FILES
/usr/share/lib/terminfo/?/*compiled terminal description database
/usr/include/term.hterminfo header file
SEE ALSO
curses(3X).
infocmp(1M), terminfo(4), term(5)
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