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466
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1 <refentry id="crc">
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2 <refnamediv>
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468
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3 <refname>Crc</refname>
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4 <refpurpose>compute a cyclic redundancy count</refpurpose>
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466
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5 </refnamediv>
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6
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7 <refsynopsisdiv>
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8 <funcsynopsis>
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9 <funcprototype>
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10 <funcdef><function>crc</function></funcdef>
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570
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11 <paramdef>char *<parameter>start</parameter></paramdef>
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12 <paramdef>int <parameter>count</parameter></paramdef>
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13 <paramdef>char <parameter>accum</parameter>[3]</paramdef>
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466
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14 </funcprototype>
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15 </funcsynopsis>
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16
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17 </refsynopsisdiv>
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18
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540
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19 <refsect1><title>Assembler Equivalent</title>
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20 <para>
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21 os9 F$CRC
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22 </para>
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23 </refsect1>
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24
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466
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25 <refsect1><title>Description</title>
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26 <para>
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594
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27 This call accumulates a crc into a three byte array at "accum"
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28 for "count" bytes starting at "start". All three bytes of
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29 "accum" should be initialized to 0xff before the first call to
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30 "crc()". However, repeated calls can be subsequently made to
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31 cover an entire module. If the result is to be used as an OS-9
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32 module crc, it should have its bytes complemented before
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33 insertion at the end of the module.
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466
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34 </para>
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35 </refsect1>
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36 </refentry>
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