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     19 <a name=A.17>Table of Contents</a>
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     25 
     26 <H2>A.17 The optional String word set</H2>
     27 
     28 
     29 
     30 <hr>
     31 <A name=A.17.6>
     32 <H3>A.17.6 Glossary</H3>
     33 </a>
     34 
     35 
     36 
     37 <hr>
     38 <A name=A.17.6.1.0245>A.17.6.1.0245 /STRING</A>
     39 <P>
     40 
     41 /STRING is used to remove or add characters relative to the <B>left</B>
     42 end of the character string.  Positive values of n will exclude
     43 characters from the string while negative values of n will include
     44 characters to the left of the string.  /STRING is a natural factor of
     45 <a href=dpans6.htm#6.1.2450>WORD</a> 
     46 and commonly available.
     47 
     48 <P>
     49 
     50 <hr>
     51 <A name=A.17.6.1.0910>A.17.6.1.0910 CMOVE</A>
     52 <P>
     53 
     54 If c-addr2 lies within the source region (i.e., when c-addr2 is not less
     55 than c-addr1 and c-addr2 is less than the quantity c-addr1 u 
     56 <a href=dpans6.htm#6.1.0898>CHARS</a> +),
     57 memory propagation occurs.
     58 
     59 <P>
     60 
     61 Typical
     62 use:    Assume a character string at address 100: <B>ABCD</B>.  Then after
     63 
     64 
     65 <PRE>
     66 	100 DUP  CHAR+  3 CMOVE
     67 </PRE>
     68 
     69 <P>
     70 
     71 the string at address 100 is <B>AAAA</B>.
     72 
     73 <P>
     74 
     75 Rationale
     76 for CMOVE and 
     77 <a href=dpans17.htm#17.6.1.0920>CMOVE&gt;</a> follows 
     78 <a href=dpans6.htm#6.1.1900>MOVE</a>.
     79 
     80 <P>
     81 
     82 <hr>
     83 <A name=A.17.6.1.0920>A.17.6.1.0920 CMOVE&gt;</A>
     84 <P>
     85 
     86 If c-addr1 lies within the destination region (i.e., when c-addr1 is
     87 greater than or equal to c-addr2 and c-addr2 is less than the quantity
     88 c-addr1 u 
     89 <a href=dpans6.htm#6.1.0898>CHARS</a> +), memory propagation occurs.
     90 
     91 <P>
     92 
     93 Typical use:    Assume a character string at address 100: <B>ABCD</B>.
     94 Then after
     95 
     96 
     97 <PRE>
     98 	100 DUP CHAR+ SWAP 3 CMOVE>
     99 </PRE>
    100 
    101 <P>
    102 
    103 the string at address 100 is <B>DDDD</B>.
    104 
    105 <P>
    106 
    107 <hr>
    108 <A name=A.17.6.1.0935>A.17.6.1.0935 COMPARE</A>
    109 <P>
    110 
    111 Existing Forth systems perform string comparison operations using words that
    112 differ in spelling, input and output arguments, and case sensitivity.  One in
    113 widespread use was chosen.
    114 
    115 <P>
    116 
    117 <hr>
    118 <A name=A.17.6.1.2191>A.17.6.1.2191 SEARCH</A>
    119 <P>
    120 
    121 Existing Forth systems perform string searching operations using words that
    122 differ in spelling, input and output arguments, and case sensitivity.  One in
    123 widespread use was chosen.
    124 
    125 <P>
    126 
    127 <hr>
    128 <A name=A.17.6.1.2212>A.17.6.1.2212 SLITERAL</A>
    129 <P>
    130 
    131 The current functionality of 
    132 <a href=dpans6.htm#6.1.2165>6.1.2165</a> S" may be provided by the following
    133 definition:
    134 
    135 <PRE>
    136 : S" ( "ccc&lt;quote&gt;" -- )
    137     [CHAR] " PARSE   POSTPONE SLITERAL ; IMMEDIATE
    138 
    139 </PRE>
    140 <P>
    141 
    142 
    143 <hr>
    144 <A href=dpans.htm#toc><IMG   src="up.gif" ></A>    Table of Contents 
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