byte, byte-size, byte-position

byte, byte-size, byte-position Function

Syntax:

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

Expanded Reference: byte, byte-size, byte-position

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(byte, byte-size, byte-position )