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CMUCL implements characters according to Common Lisp: The Language II. The
main difference from the first version is that character bits and font
have been eliminated, and the names of the types have been changed.
base-character is the new equivalent of the old
string-char. In this implementation, all characters are
base characters (there are no extended characters).
If (featurep :unicode) is false, then character codes
range between 0 and 255, using the ASCII encoding.
Otherwise, Unicode is supported and character codes corresond to utf-16
code units. See i18n for further information.
Table 2.1 shows characters recognized by CMUCL.
| Name | Code | Lisp Name | Alternatives |
|---|---|---|---|
| nul | 0 | #\NULL | |
| bel | 0 | #\BELL | |
| bs | 8 | #\BACKSPACE | #\BS |
| tab | 9 | #\TAB | |
| lf | 10 | #\NEWLINE | #\NL #\LINEFEED #\LF |
| ff | 11 | #\VT | #\PAGE #\FORM |
| cr | 13 | #\RETURN | #\CR |
| esc | 27 | #\ESCAPE | #\ESC #\ALTMODE #\ALT |
| sp | 32 | #\SPACE | #\SP |
| del | 127 | #\DELETE | #\RUBOUT |
Table 2.1: Characters recognized by CMUCL
When Unicode support is available, additional character names are
supported. If the Unicode character has a name, such as “GREEK SMALL
LETTER ALPHA”, you may use #\greek_small_letter_alpha to
create the Greek character alpha whose code point value is
#x3b1. Alternatively, you can specify a character using the
hex value of the code point. Hence #\u+3b1 produces the same
character. The u+ is required for hex values.
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