term(4) term(4)
term - format of compiled term file
/usr/share/lib/terminfo/?/*
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<b>/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.
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>.
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term(4) term(4)
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
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
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term(4) term(4)
*
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.
/usr/share/lib/terminfo/?/* - compiled terminal description database
/usr/include/term.h - terminfo header file
curses(3X)
infocmp(1M), terminfo(4), term(5)
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