12.2.66 byte, byte-size, byte-position [Function]

byte size position ⇒ bytespec

byte-size bytespec ⇒ size

byte-position bytespec ⇒ position

Arguments and Values::

size, position—a non-negative integer.

bytespec—a byte specifier.

Description::

byte returns a byte specifier that indicates a byte of width size and whose bits have weights 2^position + size - 1\/ through 2^position, and whose representation is implementation-dependent.

byte-size returns the number of bits specified by bytespec.

byte-position returns the position specified by bytespec.

Examples::

 (setq b (byte 100 200)) ⇒  #<BYTE-SPECIFIER size 100 position 200>
 (byte-size b) ⇒  100
 (byte-position b) ⇒  200

See Also::

ldb , dpb

Notes::

 (byte-size (byte j k)) ≡ j
 (byte-position (byte j k)) ≡ k

A byte of size of 0 is permissible; it refers to a byte of width zero. For example,

 (ldb (byte 0 3) #o7777) ⇒  0
 (dpb #o7777 (byte 0 3) 0) ⇒  0