68 lines
3.9 KiB
HTML
68 lines
3.9 KiB
HTML
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<TITLE>CLHS: Function DEPOSIT-FIELD</TITLE>
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<A NAME="deposit-field"><I>Function</I> <B>DEPOSIT-FIELD</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>deposit-field</B> <I>newbyte bytespec integer</I> => <I>result-integer</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>newbyte</I>---an <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>. <P>
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<I>bytespec</I>---a <A REL=DEFINITION HREF="26_glo_b.htm#byte_specifier"><I>byte specifier</I></A>. <P>
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<I>integer</I>---an <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>. <P>
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<I>result-integer</I>---an <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Replaces a field of bits within <I>integer</I>; specifically, returns an <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A> that contains the bits of <I>newbyte</I> within the <A REL=DEFINITION HREF="26_glo_b.htm#byte"><I>byte</I></A> specified by <I>bytespec</I>, and elsewhere contains the bits of <I>integer</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(deposit-field 7 (byte 2 1) 0) => 6
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(deposit-field -1 (byte 4 0) 0) => 15
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(deposit-field 0 (byte 2 1) -3) => -7
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_by_by.htm#byte"><B>byte</B></A>, <A REL=DEFINITION HREF="f_dpb.htm#dpb"><B>dpb</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<PRE>
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(logbitp j (deposit-field m (byte s p) n))
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== (if (and (>= j p) (< j (+ p s)))
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(logbitp j m)
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(logbitp j n))
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</PRE>
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</TT> <P>
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<A REL=DEFINITION HREF="#deposit-field"><B>deposit-field</B></A> is to <A REL=DEFINITION HREF="f_mask_f.htm#mask-field"><B>mask-field</B></A> as <A REL=DEFINITION HREF="f_dpb.htm#dpb"><B>dpb</B></A> is to <A REL=DEFINITION HREF="f_ldb.htm#ldb"><B>ldb</B></A>. <P>
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