The
mapscrn
command is obsolete - its function is now built-in into setfont.
However, for backwards compatibility it is still available
as a separate command.
The
mapscrn
command loads a user defined output character mapping table into the
console driver. The console driver may be later put into
use user-defined mapping table
mode by outputting a special escape sequence to the console device.
This sequence is
<esc>(K
for the
G0
character set and
<esc>)K
for the
G1
character set.
When the
-o
option is given, the old map is saved in
map.orig.
USE
There are two kinds of mapping tables: direct-to-font tables,
that give a font position for each user byte value, and user-to-unicode
tables that give a unicode value for each user byte. The corresponding
glyph is now found using the unicode index of the font.
The command
mapscrn trivial
sets up a one-to-one direct-to-font table where user bytes
directly address the font. This is useful for fonts that are
in the same order as the character set one uses.
A command like
mapscrn 8859-2
sets up a user-to-unicode table that assumes that the user
uses ISO 8859-2.
INPUT FORMAT
The
mapscrn
command can read the map in either of two formats:
1. 256 or 512 bytes binary data
2. two-column text file
Format (1) is a direct image of the translation
table. The 256-bytes tables are direct-to-font,
the 512-bytes tables are user-to-unicode tables.
Format (2) is used to fill the
table
as follows: cell with offset mentioned in the first column is filled
with the value mentioned in the second column.
When values larger than 255 occur, or values are written using
the U+xxxx notation, the table is assumed to be a user-to-unicode
table, otherwise it is a direct-to-font table.
Values in the file may be specified in one of several
formats: 1. Decimal:
String of decimal digits not starting with '0'
2. Octal:
String of octal digits beginning with '0'.
3. Hexadecimal:
String of hexadecimal digits preceded by "0x".
4. Unicode:
String of four hexadecimal digits preceded by "U+".
5. Character:
Single character enclosed in single quotes. (And the binary value is used.)
Note that blank, comma, tab character and '#' cannot be specified
with this format.
6. UTF-8 Character:
Single (possibly multi-byte) UTF-8 character, enclosed in single quotes.
Note that control characters (with codes < 32) cannot be re-mapped with
mapscrn
because they have special meaning for the driver.
FILES
/lib/kbd/consoletrans
is the default directory for screen mappings.
