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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/erl_interface-3.7.9.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Erlang Interface</strong><br><strong>Reference Manual</strong><br><small>Version 3.7.9</small></p>
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<li title="ei_reg_send_tmo"><a href="ei_connect.html#ei_reg_send_tmo">ei_reg_send_tmo()
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<li title="ei_send_reg_encoded_tmo"><a href="ei_connect.html#ei_send_reg_encoded_tmo">ei_send_reg_encoded_tmo()
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<li title="ei_rpc_to"><a href="ei_connect.html#ei_rpc_to">ei_rpc_to()
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<li title="ei_rpc_from"><a href="ei_connect.html#ei_rpc_from">ei_rpc_from()
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<li title="*ei_gethostbyname"><a href="ei_connect.html#*ei_gethostbyname">*ei_gethostbyname()
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<li title="ei_reg_open"><a href="registry.html#ei_reg_open">ei_reg_open()
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<li title="ei_reg_getival"><a href="registry.html#ei_reg_getival">ei_reg_getival()
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</a></li>
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</a></li>
<li title="ei_reg_getval"><a href="registry.html#ei_reg_getval">ei_reg_getval()
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<li title="ei_reg_tabstat"><a href="registry.html#ei_reg_tabstat">ei_reg_tabstat()
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<li title="ei_reg_dump"><a href="registry.html#ei_reg_dump">ei_reg_dump()
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<li title="ei_reg_restore"><a href="registry.html#ei_reg_restore">ei_reg_restore()
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</ul>
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<li id="no" title="erl_connect " expanded="false">erl_connect<ul>
<li><a href="erl_connect.html">
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<li title="erl_connect_init"><a href="erl_connect.html#erl_connect_init">erl_connect_init()
</a></li>
<li title="erl_connect_xinit"><a href="erl_connect.html#erl_connect_xinit">erl_connect_xinit()
</a></li>
<li title="erl_connect"><a href="erl_connect.html#erl_connect">erl_connect()
</a></li>
<li title="erl_xconnect"><a href="erl_connect.html#erl_xconnect">erl_xconnect()
</a></li>
<li title="erl_close_connection"><a href="erl_connect.html#erl_close_connection">erl_close_connection()
</a></li>
<li title="erl_receive"><a href="erl_connect.html#erl_receive">erl_receive()
</a></li>
<li title="erl_receive_msg"><a href="erl_connect.html#erl_receive_msg">erl_receive_msg()
</a></li>
<li title="erl_xreceive_msg"><a href="erl_connect.html#erl_xreceive_msg">erl_xreceive_msg()
</a></li>
<li title="erl_send"><a href="erl_connect.html#erl_send">erl_send()
</a></li>
<li title="erl_reg_send"><a href="erl_connect.html#erl_reg_send">erl_reg_send()
</a></li>
<li title="erl_rpc"><a href="erl_connect.html#erl_rpc">erl_rpc()
</a></li>
<li title="erl_rpc_to"><a href="erl_connect.html#erl_rpc_to">erl_rpc_to()
</a></li>
<li title="erl_rpc_from"><a href="erl_connect.html#erl_rpc_from">erl_rpc_from()
</a></li>
<li title="erl_publish"><a href="erl_connect.html#erl_publish">erl_publish()
</a></li>
<li title="erl_accept"><a href="erl_connect.html#erl_accept">erl_accept()
</a></li>
<li title="erl_thiscookie"><a href="erl_connect.html#erl_thiscookie">erl_thiscookie()
</a></li>
<li title="erl_thisnodename"><a href="erl_connect.html#erl_thisnodename">erl_thisnodename()
</a></li>
<li title="erl_thishostname"><a href="erl_connect.html#erl_thishostname">erl_thishostname()
</a></li>
<li title="erl_thisalivename"><a href="erl_connect.html#erl_thisalivename">erl_thisalivename()
</a></li>
<li title="erl_thiscreation"><a href="erl_connect.html#erl_thiscreation">erl_thiscreation()
</a></li>
<li title="erl_unpublish"><a href="erl_connect.html#erl_unpublish">erl_unpublish()
</a></li>
<li title="*erl_gethostbyname"><a href="erl_connect.html#*erl_gethostbyname">*erl_gethostbyname()
</a></li>
<li title="*erl_gethostbyaddr"><a href="erl_connect.html#*erl_gethostbyaddr">*erl_gethostbyaddr()
</a></li>
<li title="*erl_gethostbyname_r"><a href="erl_connect.html#*erl_gethostbyname_r">*erl_gethostbyname_r()
</a></li>
<li title="*erl_gethostbyaddr_r"><a href="erl_connect.html#*erl_gethostbyaddr_r">*erl_gethostbyaddr_r()
</a></li>
</ul>
</li>
<li id="no" title="erl_error " expanded="false">erl_error<ul>
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</a></li>
<li title="erl_err_msg"><a href="erl_error.html#erl_err_msg">erl_err_msg()
</a></li>
<li title="erl_err_quit"><a href="erl_error.html#erl_err_quit">erl_err_quit()
</a></li>
<li title="erl_err_ret"><a href="erl_error.html#erl_err_ret">erl_err_ret()
</a></li>
<li title="erl_err_sys"><a href="erl_error.html#erl_err_sys">erl_err_sys()
</a></li>
<li title=""><a href="erl_error.html#">erl_errno()
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<!-- refpage --><center><h1>erl_format</h1></center>
<h3>C LIBRARY</h3>
<div class="REFBODY">erl_format</div>
<h3>LIBRARY SUMMARY</h3>
<div class="REFBODY">Create and Match Erlang Terms</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>This module contains two routines - one general function for
creating Erlang terms and one for pattern matching Erlang terms.</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="erl_format"><span class="bold_code">ETERM *erl_format(FormatStr, ... )</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">char *FormatStr;</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This is a general function for creating Erlang terms using
a format specifier and a corresponding set of arguments, much
in the way <span class="code">printf()</span> works.</p>
<p><span class="code">FormatStr</span> is a format specification string. The set
of valid format specifiers is as follows:</p>
<ul>
<li>
<p>~i - Integer</p>
</li>
<li>
<p>~f - Floating point</p>
</li>
<li>
<p>~a - Atom</p>
</li>
<li>
<p>~s - String</p>
</li>
<li>
<p>~w - Arbitrary Erlang term</p>
</li>
</ul>
<p>For each format specifier that appears in <span class="code">FormatStr</span>,
there must be a corresponding argument following
<span class="code">FormatStr</span>. An Erlang term is built according to the
<span class="code">FormatStr</span> with values and Erlang terms substituted from
the corresponding arguments and according to the individual
format specifiers. For example:</p>
<div class="example"><pre>
erl_format("[{name,~a},{age,~i},{data,~w}]",
"madonna",
21,
erl_format("[{adr,~s,~i}]","E-street",42));
</pre></div>
<p>This will create an <span class="code">(ETERM *)</span> structure corresponding
to the Erlang term:
<span class="code">[{name,madonna},{age,21},{data,[{adr,"E-street",42}]}]</span></p>
<p>The function returns an Erlang term, or NULL if
<span class="code">FormatStr</span> does not describe a valid Erlang term.</p>
</p></div>
<p><a name="erl_match"><span class="bold_code">int erl_match(Pattern, Term)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">ETERM *Pattern,*Term;</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is used to perform pattern matching similar
to that done in Erlang. Refer to an Erlang manual for matching
rules and more examples.</p>
<p><span class="code">Pattern</span> is an Erlang term, possibly containing unbound
variables. </p>
<p><span class="code">Term</span> is an Erlang term that we wish to match against
<span class="code">Pattern</span>.</p>
<p><span class="code">Term</span> and <span class="code">Pattern</span> are compared, and any
unbound variables in <span class="code">Pattern</span> are bound to corresponding
values in <span class="code">Term</span>. </p>
<p>If <span class="code">Term</span> and <span class="code">Pattern</span> can be matched, the
function returns a non-zero value and binds any unbound
variables in <span class="code">Pattern</span>. If <span class="code">Term</span> <span class="code">Pattern</span> do
not match, the function returns 0. For example:</p>
<div class="example"><pre>
ETERM *term, *pattern, *pattern2;
term1 = erl_format("{14,21}");
term2 = erl_format("{19,19}");
pattern1 = erl_format("{A,B}");
pattern2 = erl_format("{F,F}");
if (erl_match(pattern1, term1)) {
/* match succeeds:
* A gets bound to 14,
* B gets bound to 21
*/
...
}
if (erl_match(pattern2, term1)) {
/* match fails because F cannot be
* bound to two separate values, 14 and 21
*/
...
}
if (erl_match(pattern2, term2)) {
/* match succeeds and F gets bound to 19 */
...
}
</pre></div>
<p><span class="code">erl_var_content()</span> can be used to retrieve the
content of any variables bound as a result of a call to
<span class="code">erl_match()</span>.</p>
</p></div>
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