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- * @Id: term.5,v 1.21 2010/12/04 18:40:45 tom Exp @
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-<HTML>
-<HEAD>
-<TITLE>term 5</TITLE>
-<link rev=made href="mailto:bug-ncurses@gnu.org">
-<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
-</HEAD>
-<BODY>
-<H1>term 5</H1>
-<HR>
-<PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
-<STRONG><A HREF="term.5.html">term(5)</A></STRONG> <STRONG><A HREF="term.5.html">term(5)</A></STRONG>
-
-
-
-
-</PRE>
-<H2>NAME</H2><PRE>
- term - format of compiled term file.
-
-
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
- <STRONG>term</STRONG>
-
-
-</PRE>
-<H2>DESCRIPTION</H2><PRE>
- <STRONG>STORAGE</STRONG> <STRONG>LOCATION</STRONG>
- Compiled terminfo descriptions are placed under the direc-
- tory <STRONG>/usr/share/terminfo</STRONG>. Two configurations are sup-
- ported (when building the ncurses libraries):
-
- <STRONG>directory</STRONG> <STRONG>tree</STRONG>
- A two-level scheme is used to avoid a linear search
- of a huge UNIX system directory: <STRONG>/usr/share/ter-</STRONG>
- <STRONG>minfo/c/name</STRONG> where <EM>name</EM> is the name of the terminal,
- and <EM>c</EM> is the first character of <EM>name</EM>. Thus, <EM>act4</EM> can
- be found in the file <STRONG>/usr/share/terminfo/a/act4</STRONG>.
- Synonyms for the same terminal are implemented by
- multiple links to the same compiled file.
-
- <STRONG>hashed</STRONG> <STRONG>database</STRONG>
- Using Berkeley database, two types of records are
- stored: the terminfo data in the same format as
- stored in a directory tree with the terminfo's pri-
- mary name as a key, and records containing only
- aliases pointing to the primary name.
-
- If built to write hashed databases, ncurses can still
- read terminfo databases organized as a directory
- tree, but cannot write entries into the directory
- tree. It can write (or rewrite) entries in the
- hashed database.
-
- ncurses distinguishes the two cases in the TERMINFO
- and TERMINFO_DIRS environment variable by assuming a
- directory tree for entries that correspond to an
- existing directory, and hashed database otherwise.
-
- <STRONG>STORAGE</STRONG> <STRONG>FORMAT</STRONG>
- The format has been chosen so that it will be the same on
- all hardware. An 8 or more bit byte is assumed, but no
- assumptions about byte ordering or sign extension are
- made.
-
- The compiled file is created with the <STRONG>tic</STRONG> program, and
- read by the routine <EM>setupterm</EM>. The file is divided into
- six parts: the header, terminal names, boolean flags, num-
- bers, 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 sec-
- tion;
-
- (5) the number of offsets (short integers) in the
- strings section;
-
- (6) the size, in bytes, of the string table.
-
- 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 the two bytes 0377, 0377; other
- negative values are illegal. This value generally means
- that the corresponding capability is missing from this
- terminal. Note that this format corresponds to the hard-
- ware of the VAX and PDP-11 (that is, little-endian
- machines). Machines where this does not correspond to the
- hardware must read the integers as two bytes and compute
- the little-endian value.
-
- The terminal names section comes next. It contains the
- first line of the terminfo description, listing the vari-
- ous names for the terminal, separated by the `|' charac-
- ter. The section is terminated with an ASCII NUL charac-
- ter.
-
- The boolean flags have one byte for each flag. This byte
- is either 0 or 1 as the flag is present or absent. The
- capabilities are in the same order as the file &lt;term.h&gt;.
-
- Between the boolean section and the number section, a null
- byte will be inserted, if necessary, to ensure that the
- number section begins on an even byte (this is a relic of
- the PDP-11's word-addressed architecture, originally
- designed in to avoid IOT traps induced by addressing a
- word on an odd byte boundary). All short integers are
- aligned on a short word boundary.
-
- The numbers section is similar to the flags section. Each
- capability takes up two bytes, and is stored as a little-
- endian short integer. If the value represented is -1, 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 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 repre-
- sentation. Padding information $&lt;nn&gt; and parameter infor-
- mation %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.
-
- <STRONG>EXTENDED</STRONG> <STRONG>STORAGE</STRONG> <STRONG>FORMAT</STRONG>
- The previous section describes the conventional terminfo
- binary format. With some minor variations of the offsets
- (see PORTABILITY), the same binary format is used in all
- modern UNIX systems. Each system uses a predefined set of
- boolean, number or string capabilities.
-
- The ncurses libraries and applications support extended
- terminfo binary format, allowing users to define capabili-
- ties which are loaded at runtime. This extension is made
- possible by using the fact that the other implementations
- stop reading the terminfo data when they have reached the
- end of the size given in the header. ncurses checks the
- size, and if it exceeds that due to the predefined data,
- continues to parse according to its own scheme.
-
- First, it reads the extended header (5 short integers):
-
- (1) count of extended boolean capabilities
-
- (2) count of extended numeric capabilities
-
- (3) count of extended string capabilities
-
- (4) size of the extended string table in bytes.
-
- (5) last offset of the extended string table in
- bytes.
-
- Using the counts and sizes, ncurses allocates arrays and
- reads data for the extended capabilties in the same order
- as the header information.
-
- The extended string table contains values for string capa-
- bilities. After the end of these values, it contains the
- names for each of the extended capabilities in order,
- e.g., booleans, then numbers and finally strings.
-
-
-</PRE>
-<H2>PORTABILITY</H2><PRE>
- Note that it is possible for <EM>setupterm</EM> to expect a differ-
- ent set of capabilities than are actually present in the
- file. Either the database may have been updated since
- <EM>setupterm</EM> has been recompiled (resulting in extra unrecog-
- nized entries in the file) or the program may have been
- recompiled more recently than the database was updated
- (resulting in missing entries). The routine <EM>setupterm</EM>
- 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.
-
- Despite the consistent use of little-endian for numbers
- and the otherwise self-describing format, it is not wise
- to count on portability of binary terminfo entries between
- commercial UNIX versions. The problem is that there are
- at least three versions of terminfo (under HP-UX, AIX, and
- OSF/1) which diverged from System V terminfo after SVr1,
- and have added extension capabilities to the string table
- that (in the binary format) collide with System V and XSI
- Curses extensions. See <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG> for detailed discus-
- sion of terminfo source compatibility issues.
-
-
-</PRE>
-<H2>EXAMPLE</H2><PRE>
- As an example, here is a hex dump of the description for
- the Lear-Siegler ADM-3, a popular though rather stupid
- early terminal:
-
- adm3a|lsi adm3a,
- am,
- cols#80, lines#24,
- bel=^G, clear= 32$&lt;1&gt;, cr=^M, cub1=^H, cud1=^J,
- cuf1=^L, cup=\E=%p1%{32}%+%c%p2%{32}%+%c, cuu1=^K,
- home=^^, ind=^J,
-
- 0000 1a 01 10 00 02 00 03 00 82 00 31 00 61 64 6d 33 ........ ..1.adm3
- 0010 61 7c 6c 73 69 20 61 64 6d 33 61 00 00 01 50 00 a|lsi ad m3a...P.
- 0020 ff ff 18 00 ff ff 00 00 02 00 ff ff ff ff 04 00 ........ ........
- 0030 ff ff ff ff ff ff ff ff 0a 00 25 00 27 00 ff ff ........ ..%.'...
- 0040 29 00 ff ff ff ff 2b 00 ff ff 2d 00 ff ff ff ff ).....+. ..-.....
- 0050 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0060 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0070 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0080 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0090 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00a0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00b0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00c0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00d0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00e0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 00f0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0100 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0110 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ........ ........
- 0120 ff ff ff ff ff ff 2f 00 07 00 0d 00 1a 24 3c 31 ....../. .....$&lt;1
- 0130 3e 00 1b 3d 25 70 31 25 7b 33 32 7d 25 2b 25 63 &gt;..=%p1% {32}%+%c
- 0140 25 70 32 25 7b 33 32 7d 25 2b 25 63 00 0a 00 1e %p2%{32} %+%c....
- 0150 00 08 00 0c 00 0b 00 0a 00 ........ .
-
-
-
-</PRE>
-<H2>LIMITS</H2><PRE>
- Some limitations: total compiled entries cannot exceed
- 4096 bytes. The name field cannot exceed 128 bytes.
-
-
-</PRE>
-<H2>FILES</H2><PRE>
- /usr/share/terminfo/*/* compiled terminal capability data
- base
-
-
-</PRE>
-<H2>SEE ALSO</H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>.
-
-
-</PRE>
-<H2>AUTHORS</H2><PRE>
- Thomas E. Dickey
- extended terminfo format for ncurses 5.0
- hashed database support for ncurses 5.6
-
- Eric S. Raymond
-
-
-
- <STRONG><A HREF="term.5.html">term(5)</A></STRONG>
-</PRE>
-<HR>
-<ADDRESS>
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