CLHS: Function DEPOSIT-FIELD

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Function DEPOSIT-FIELD

Syntax:

deposit-field newbyte bytespec integer => result-integer

Arguments and Values:

newbyte---an integer.

bytespec---a byte specifier.

integer---an integer.

result-integer---an integer.

Description:

Replaces a field of bits within integer; specifically, returns an integer that contains the bits of newbyte within the byte specified by bytespec, and elsewhere contains the bits of integer.

Examples:

     (deposit-field 7 (byte 2 1) 0) =>  6
     (deposit-field -1 (byte 4 0) 0) =>  15
     (deposit-field 0 (byte 2 1) -3) =>  -7

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

byte, dpb

Notes:

     (logbitp j (deposit-field m (byte s p) n))
     ==  (if (and (>= j p) (< j (+ p s)))
            (logbitp j m)
            (logbitp j n))

deposit-field is to mask-field as dpb is to ldb.

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