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All \[charXXX] special character names have been removed from the font
files. They don't make sense for Unicode.
The following special character name from the AT&T troff manual by
Ossanna and Kernighan is unmapped:
bs shaded solid ball (Bell System logo, AT&T logo)
Code point 0x002D has not been given a name because its Unicode name
HYPHEN-MINUS is so ambiguous that it is unusable for serious typographic
work.
\[wp] has been mapped to 0x2118, because according to Unicode 4.1's
NamesList.txt, U+2118 SCRIPT CAPITAL P is really a Weierstrass 'p',
neither SCRIPT nor CAPITAL.
The following line could be added; \[space] is known to devps but is not
documented and not known to devdvi (actually, there is no space glyph
within the TeX system).
space 24 0 0x0020
devps maps \[*U] to 'Upsilon1', which is equivalent to 0x03D2. We map
it to 0x03A5 instead.
devps maps \[*W] to 'Omega', which is equivalent to either 0x2126 or
0x03A9. We map it to 0x03A9.
devps maps \[*D] to 'Delta', which is equivalent to either 0x2206 or
0x0394. We map it to 0x0394.
Adding Unicode characters
-------------------------
Assume you want to use a Unicode character not provided in the list, say
U+20AC. You need to do two things:
- Add a line
u20AC 24 0 0x20AC
(the second column is computed as 24 * wcwidth(0x20AC)) to the file
R.proto, or, when groff is already installed, to the four font
description files in $(prefix)/share/groff/<version>/font/devutf8/.
- In your source file, use the notation \[u20AC] to access it.
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