.\"***************************************************************************
-.\" Copyright (c) 1998-2004,2006 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2016,2017 Free Software Foundation, Inc. *
.\" *
.\" Permission is hereby granted, free of charge, to any person obtaining a *
.\" copy of this software and associated documentation files (the *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: term.5,v 1.17 2006/12/03 01:08:16 tom Exp $
-.TH TERM 5
+.\" $Id: term.5,v 1.27 2017/12/16 21:27:20 tom Exp $
+.TH term 5
+.ie \n(.g .ds `` \(lq
+.el .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el .ds '' ''
+.de NS
+.ie n .sp
+.el .sp .5
+.ie n .in +4
+.el .in +2
+.nf
+.ft C \" Courier
+..
+.de NE
+.fi
+.ft R
+.in -4
+..
+.de bP
+.ie n .IP \(bu 4
+.el .IP \(bu 2
+..
.ds n 5
.ds d @TERMINFO@
.SH NAME
environment variable by assuming a directory tree for entries that
correspond to an existing directory,
and hashed database otherwise.
-.SS STORAGE FORMAT
+.SS LEGACY STORAGE FORMAT
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.
.PP
-The compiled file is created with the
-.I tic
-program, and read by the routine
-.IR setupterm .
+The compiled file is created with the \fB@TIC@\fP program,
+and read by the routine \fBsetupterm\fP(3X).
The file is divided into six parts:
the header,
terminal names,
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
+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 hardware of the \s-1VAX\s+1
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 `|' character.
+separated by the \*(``|\*('' character.
The section is terminated with an \s-1ASCII NUL\s+1 character.
.PP
The boolean flags have one byte for each flag.
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
+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.
+If the value represented is \-1, the capability is taken to be missing.
.PP
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.
+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 \ec notation are stored in their
.RE
.PP
Using the counts and sizes, ncurses allocates arrays and reads data
-for the extended capabilties in the same order as the header information.
+for the extended capabilities in the same order as the header information.
.PP
The extended string table contains values for string capabilities.
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.
+.PP
+Applications which manipulate terminal data can use the definitions
+described in \fBterm_variables\fP(3X) which associate the long capability
+names with members of a \fBTERMTYPE\fP structure.
.
+.SS EXTENDED NUMBER FORMAT
+.PP
+On occasion, 16-bit signed integers are not large enough.
+With ncurses 6.1, a new format is introduced by making a few changes
+to the legacy format:
+.bP
+a different magic number (0542)
+.bP
+changing the type for the \fInumber\fP array from signed 16-bit integers
+to signed 32-bit integers.
+.PP
+To maintain compatibility, the library presents the same data structures
+to direct users of the \fBTERMTYPE\fP structure as in previous formats.
+However, that cannot provide callers with the extended numbers.
+The library uses a similar but hidden data structure \fBTERMTYPE2\fP
+to provide data for the terminfo functions.
.SH PORTABILITY
Note that it is possible for
-.I setupterm
+.B setupterm
to expect a different set of capabilities
than are actually present in the file.
Either the database may have been updated since
-.I setupterm
+.B 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
-.I setupterm
+.B 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
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
+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 \fBterminfo\fR(\*n) for detailed
discussion of terminfo source compatibility issues.
+.PP
+Direct access to the \fBTERMTYPE\fP structure is provided for legacy
+applications.
+Portable applications should use the \fBtigetflag\fP and related functions
+described in \fBcurs_terminfo\fP(3X) for reading terminal capabilities.
+.PP
+A small number of terminal descriptions use uppercase characters in
+their names.
+If the underlying filesystem ignores the difference between
+uppercase and lowercase,
+ncurses represents the \*(``first character\*('' of the terminal name used as
+the intermediate level of a directory tree in (two-character) hexadecimal form.
.SH EXAMPLE
-As an example, here is a hex dump of the description for the Lear-Siegler
-ADM-3, a popular though rather stupid early terminal:
-.nf
-.sp
+As an example, here is a description for the Lear-Siegler
+ADM\-3, a popular though rather stupid early terminal:
+.NS
adm3a|lsi adm3a,
am,
cols#80, lines#24,
bel=^G, clear=\032$<1>, cr=^M, cub1=^H, cud1=^J,
cuf1=^L, cup=\\E=%p1%{32}%+%c%p2%{32}%+%c, cuu1=^K,
home=^^, ind=^J,
-.sp
+.NS
+.PP
+and a hexadecimal dump of the compiled terminal description:
+.NS
.ft CW
\s-20000 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.
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 ........ .\s+2
.ft R
-.fi
+.NE
.sp
.SH LIMITS
-Some limitations: total compiled entries cannot exceed 4096 bytes.
-The name field cannot exceed 128 bytes.
+Some limitations:
+.bP
+total compiled entries cannot exceed 4096 bytes in the legacy format.
+.bP
+total compiled entries cannot exceed 32768 bytes in the extended format.
+.bP
+the name field cannot exceed 128 bytes.
.SH FILES
\*d/*/* compiled terminal capability data base
.SH SEE ALSO
extended terminfo format for ncurses 5.0
.br
hashed database support for ncurses 5.6
+.br
+extended number support for ncurses 6.1
.sp
Eric S. Raymond
-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
-.\"# End:
+.br
+documented legacy terminfo format, e.g., from pcurses.