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This is a development version of Perl. </div> <dl> <dt id="unpack-TEMPLATE,EXPR"><a class="permalink" href="#unpack-TEMPLATE,EXPR">#</a><a id="unpack"></a><a id="unpack-TEMPLATE-EXPR"></a>unpack TEMPLATE,EXPR </dt> <dd> </dd> <dt id="unpack-TEMPLATE"><a class="permalink" href="#unpack-TEMPLATE">#</a><a id="unpack1"></a>unpack TEMPLATE</dt> <dd> <p><a href="/5.40.0-RC2/functions/unpack"><code>unpack</code></a> does the reverse of <a href="/5.40.0-RC2/functions/pack"><code>pack</code></a>: it takes a string and expands it out into a list of values. (In scalar context, it returns merely the first value produced.)</p> <p>If EXPR is omitted, unpacks the <a href="/5.40.0-RC2/perlvar#%24_"><code>$_</code></a> string. See <a href="/5.40.0-RC2/perlpacktut">perlpacktut</a> for an introduction to this function.</p> <p>The string is broken into chunks described by the TEMPLATE. Each chunk is converted separately to a value. Typically, either the string is a result of <a href="/5.40.0-RC2/functions/pack"><code>pack</code></a>, or the characters of the string represent a C structure of some kind.</p> <p>The TEMPLATE has the same format as in the <a href="/5.40.0-RC2/functions/pack"><code>pack</code></a> function. Here's a subroutine that does substring:</p> <pre><code>sub substr { my ($what, $where, $howmuch) = @_; unpack("x$where a$howmuch", $what); }</code></pre> <p>and then there's</p> <pre><code>sub ordinal { unpack("W",$_[0]); } # same as ord()</code></pre> <p>In addition to fields allowed in <a href="/5.40.0-RC2/functions/pack"><code>pack</code></a>, you may prefix a field with a %<number> to indicate that you want a <number>-bit checksum of the items instead of the items themselves. Default is a 16-bit checksum. The checksum is calculated by summing numeric values of expanded values (for string fields the sum of <code>ord($char)</code> is taken; for bit fields the sum of zeroes and ones).</p> <p>For example, the following computes the same number as the System V sum program:</p> <pre><code>my $checksum = do { local $/; # slurp! unpack("%32W*", readline) % 65535; };</code></pre> <p>The following efficiently counts the number of set bits in a bit vector:</p> <pre><code>my $setbits = unpack("%32b*", $selectmask);</code></pre> <p>The <code>p</code> and <code>P</code> formats should be used with care. Since Perl has no way of checking whether the value passed to <a href="/5.40.0-RC2/functions/unpack"><code>unpack</code></a> corresponds to a valid memory location, passing a pointer value that's not known to be valid is likely to have disastrous consequences.</p> <p>If there are more pack codes or if the repeat count of a field or a group is larger than what the remainder of the input string allows, the result is not well defined: the repeat count may be decreased, or <a href="/5.40.0-RC2/functions/unpack"><code>unpack</code></a> may produce empty strings or zeros, or it may raise an exception. If the input string is longer than one described by the TEMPLATE, the remainder of that input string is ignored.</p> <p>See <a href="/5.40.0-RC2/functions/pack"><code>pack</code></a> for more examples and notes.</p> </dd> </dl> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). 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