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ioccc/next/rules.html
T
Landon Curt Noll bf6d0a3574 experiment to move much of Rule 17 text into an FAQ
In order simplify the write-up of the actual Rule 17
into a new FAQ 1.8.  The somewhat shorted Rule 17 text
now refers to checks performed by tools, encourages
their use, discourages their misuse (overriding limits),
and is easier to read: we think.
2025-03-01 01:42:21 -08:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>IOCCC Rules</h2>
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<h1 id="warning-these-rules-are-tentative">WARNING: These rules are TENTATIVE</h1>
<p>One might think of them as a <strong>beta</strong> release for the IOCCC
that is about to open.</p>
<p><strong>IMPORTANT</strong>: All <strong>tentative</strong> <a href="rules.html">rules</a> and <a href="guidelines.html">guidelines</a>
are subject to change by the <a href="../judges.html">IOCCC judges</a> at any time.
See both the <a href="../news.html">IOCCC news</a> and the <a href="https://fosstodon.org/@ioccc">IOCCC
Mastodon</a> feed as <em>sometimes</em> the
<a href="../judges.html">IOCCC judges</a> <em>mention</em> changes there.</p>
<p>See our
FAQ on “<a href="../faq.html#feedback">rules, guidelines, tools feedback</a>”
as well as our
FAQ on “<a href="../faq.html#question">about asking questions</a>”
about these rules. You might also find the FAQ in general useful, especially the
FAQ on “<a href="../quick-start.html#enter">how to enter the IOCCC</a>”.</p>
<h1 id="the-ioccc-is-pending">The IOCCC is pending</h1>
<p>While the IOCCC is not open now, there is a tentative opening date for the next IOCCC.</p>
<p>Comments and suggestions on these preliminary rules are welcome. See the
<a href="../faq.html#feedback">FAQ</a> for how to suggest, correct or provide feedback
about these rules.</p>
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<h1 id="th-international-obfuscated-c-code-contest-official-rules">28th International Obfuscated C Code Contest Official Rules</h1>
<p class="leftbar">
Copyright © 2024-2025 Leonid A. Broukhis and Landon Curt Noll.
</p>
<p>All Rights Reserved. Permission for personal, education or non-profit use is
granted provided this this copyright and notice are included in its entirety
and remains unaltered. All other uses must receive prior permission in
writing by <a href="../contact.html">contacting the judges</a>.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rules_version">
<div id="version">
<h2 id="ioccc-rules-version">IOCCC Rules version</h2>
</div>
</div>
<p class="leftbar">
These <a href="rules.html">IOCCC rules</a> are version <strong>28.26 2025-02-28</strong>.
</p>
<p class="leftbar">
The markdown form of these rules <a href="rules.md" download="rules.md">is
available for download</a>.
</p>
<p><strong>IMPORTANT</strong>: Be sure to read the <a href="guidelines.html">IOCCC guidelines</a>.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="change_marks">
<h3 id="change-marks">Change marks</h3>
</div>
<p class="leftbar">
<strong>← Lines that start with this symbol indicate a change from the previous IOCCC</strong>
</p>
<p class="leftbar">
Most lines that were modified since the previous IOCCC start with a solid
4 pixel black left border (or, in the case of a code block or blockquote,
just a vertical bar). We say <em>most lines</em> because we sometimes forget
to bar modified sections.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="obfuscate">
<h1 id="obfuscate-defined">Obfuscate defined:</h1>
</div>
<p>tr.v. -cated, -cating, -cates.
<br><br>
<strong>1a.</strong> To render obscure.<br>
<strong>1b.</strong> To darken.
<br><br>
<strong>2.</strong> To confuse: his emotions obfuscated his judgment.<br>
    [LLat. obfuscare, to darken : ob(intensive) + Lat. fuscare,<br>
    to darken &lt; fuscus, dark.] -obfuscation n. obfuscatory adj.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="goals">
<h1 id="goals-of-the-contest">Goals of the Contest</h1>
</div>
<p>The goals of the IOCCC:</p>
<ul>
<li>To write the most Obscure/Obfuscated C program within the <a href="rules.html">IOCCC rules</a>.</li>
<li>To show the importance of programming style, in an ironic way.</li>
<li>To emphasize the value of perspicuous code by use of negative examples.</li>
<li>To stress C compilers with unusual code.</li>
<li>To illustrate some of the subtleties of the C language.</li>
<li>To provide a safe forum for poor C code. :-)</li>
<li>To have fun with C!</li>
</ul>
<p>Jump to: <a href="#">top</a></p>
<div id="dates">
<h1 id="important-ioccc-dates">Important IOCCC dates</h1>
</div>
<p class="leftbar">
This IOCCC runs from <strong>2024-12-29 23:58:13.213455 UTC</strong> to <strong>2025-06-05 04:03:02.010099 UTC</strong>.
</p>
<p class="leftbar">
This contest will enter the <strong><a href="../faq.html#pending">pending</a></strong> state on or about
<strong>2024-12-29 23:58:13.213455 UTC</strong>.
</p>
<p class="leftbar">
This contest will enter the <strong><a href="../faq.html#open">open</a></strong> state on <strong>2025-03-05 23:19:17.131107 UTC</strong>.
</p>
<p class="leftbar">
This contest will enter the <strong><a href="../faq.html#judging">judging</a></strong> state on <strong>2025-06-05 04:03:02.010099 UTC</strong>.
</p>
<p class="leftbar">
<strong>IMPORTANT NOTE</strong>: Until the contest enters the <strong><a href="../faq.html#open">open</a></strong> state, any or all
of the above <strong>dates and times may change</strong>!
</p>
<p class="leftbar">
Those who <a href="register.html">register</a> while the contest status is <strong><a href="../faq.html#pending">pending</a></strong>
will receive email with their <a href="https://submit.ioccc.org">submit server</a> <strong>Username</strong> and <strong>Initial password</strong>
from an <a href="../judges.html">IOCCC judge</a> shortly after the contest status becomes <strong><a href="../faq.html#open">open</a></strong>.
</p>
<p class="leftbar">
Once an <a href="../judges.html">IOCCC judge</a> emails you your <strong>Username</strong> and <strong>Initial password</strong>, you
will have 72 hours to <a href="pw-change.html">change your submit server initial password</a>.
If you do not change your <strong>Initial password</strong> in time, you will have to <a href="register.html">re-register</a>.
</p>
<p class="leftbar">
Because it takes time (maybe even a few days) for an <a href="../judges.html">IOCCC judge</a>
to process your registration and email you your initial login and password,
you should <strong>MAKE SURE</strong> you give yourself enough time before the contest closes.
In other words, <strong>DO NOT WAIT UNTIL THE FINAL DAYS</strong> of the contest to register!
The <a href="../judges.html">IOCCC judges</a> are <strong>NOT</strong> responsible for delayed or lost email,
or for those who wait until the last minute to try to register!
</p>
<p class="leftbar">
See the
FAQ on “<a href="../faq.html#mkiocccentry">obtaining and compiling the mkiocccentry tools</a>”
and the
FAQ on “<a href="../quick-start.html#enter">how to enter the IOCCC</a>”
as that FAQ has important details on
<a href="register.html">how to register</a>
as well as
<a href="submit.html">how to upload your submission</a> to the IOCCC.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rules">
<h1 id="ioccc-rules">IOCCC RULES</h1>
</div>
<p>To help us with the volume of submissions, we ask that you follow these rules:</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule0">
<h2 id="rule-0">Rule 0</h2>
</div>
<p class="leftbar">
Just as C starts at 0, so the IOCCC starts at <a href="#rule0">rule 0</a>. :-)
</p>
<p class="leftbar">
The “<a href="#dates">Important IOCCC dates</a>” section above is part of this rule.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule1">
<h2 id="rule-1">Rule 1</h2>
</div>
<p class="leftbar">
Your submission must be a C program.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule2">
<h2 id="rule-2">Rule 2</h2>
</div>
<p>The size rule requires your submission to satisfy <strong>BOTH</strong> <a href="#rule2a">Rule 2a</a> and <a href="#rule2b">Rule 2b</a>:</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule2a">
<h2 id="rule-2a">Rule 2a</h2>
</div>
<p class="leftbar">
The size of your program source <strong>should not exceed 4993 bytes</strong>.
</p>
<p class="leftbar">
If you use the most recently released official IOCCC submission
packaging tool (hereby referred to as <code>mkiocccentry(1)</code>), which we <strong>STRONGLY
recommend you do</strong> (see also <a href="#rule17">Rule 17</a>), then the <code>mkiocccentry(1)</code>
tool will warn you if there appears to be a <a href="#rule2a">Rule 2a</a> violation.
</p>
<p class="leftbar">
The <code>mkiocccentry(1)</code> tool will give you the option of overriding the <a href="#rule2a">Rule 2a</a> warning.
Overriding a <a href="#rule2a">Rule 2a</a> warning carries a <strong>fair amount of risk that your submission
will be rejected</strong>. Be sure to consult the <a href="guidelines.html">IOCCC guidelines</a>
ahead of time if you plan to override the <a href="#rule2a">Rule 2a</a> warning.
</p>
<p class="leftbar">
If you do override the <a href="#rule2a">Rule 2a</a> warning from the
<code>mkiocccentry(1)</code> tool, or otherwise plan to violate <a href="#rule2a">Rule 2a</a>, then
you <strong>MUST CLEARLY EXPLAIN THE RATIONALE</strong> of why you are doing so in your
<code>remarks.md</code> file. <strong><em>Even if you do</em> explain this in your <code>remarks.md</code> file your
submission may still be rejected</strong>.
</p>
<p class="leftbar">
You may check your code prior to submission by giving the filename
as a command like argument to the <code>iocccsize(1)</code> tool. For example:
</p>
<pre><code> ./iocccsize prog.c</code></pre>
<p class="leftbar">
Alternatively, you may use the <code>mkiocccentry(1)</code> option <code>-d</code> to verify that
things check out without having to answer all the questions. See the
FAQ on “<a href="../faq.html#mkiocccentry_test">how to test your submission without having to answer
questions</a>”
for more details.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule2b">
<h2 id="rule-2b">Rule 2b</h2>
</div>
<p class="leftbar">
When the filename of your program source is given as a command line argument to the latest version
of the official IOCCC size tool (hereby referred to as <code>iocccsize(1)</code>), the
value printed <strong>should NOT exceed <em>2503</em></strong>.
</p>
<p class="leftbar">
The source to <code>iocccsize(1)</code> may be found in the
<a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry repo</a>.
</p>
<p class="leftbar">
If you use the <code>mkiocccentry(1)</code> tool, which we <strong>STRONGLY recommend
you do</strong> (again, see also <a href="#rule17">Rule 17</a>),
then <code>mkiocccentry(1)</code> will invoke <code>iocccsize(1)</code> before packaging your submission.
</p>
<p class="leftbar">
The <code>mkiocccentry(1)</code> tool will give you the option of overriding the <a href="#rule2b">Rule 2b</a> warning.
Overriding a <a href="#rule2b">Rule 2b</a> warning carries a <strong>fair amount of risk that your submission
will be rejected</strong>. Be sure to consult the <a href="guidelines.html">IOCCC guidelines</a>
ahead of time if you plan to override the <a href="#rule2b">Rule 2b</a> warning.
</p>
<p class="leftbar">
If you do override the <a href="#rule2b">Rule 2b</a> warning from the <code>mkiocccentry(1)</code> tool,
or otherwise plan to violate <a href="#rule2b">Rule 2a</a>, then you <strong>MUST CLEARLY EXPLAIN THE RATIONALE</strong>
of why you are doing so in your <code>remarks.md</code> file. <strong><em>Even if you do</em> explain this in your <code>remarks.md</code> file
your submission may still be rejected</strong>.
</p>
<p class="leftbar">
You may check your code prior to submission by giving the filename
as a command like argument to the <code>iocccsize(1)</code> tool. For example:
</p>
<pre><code> ./iocccsize prog.c</code></pre>
<p>Jump to: <a href="#">top</a></p>
<div id="rule3">
<h2 id="rule-3">Rule 3</h2>
</div>
<p class="leftbar">
You must <a href="register.html">register</a> in order to submit your entry to the IOCCC.
You may <a href="register.html">register</a> while the contest is either
<strong><a href="../faq.html#pending">pending</a></strong> or <strong><a href="../faq.html#open">open</a></strong>.
</p>
<p class="leftbar">
See the
FAQ on “<a href="../quick-start.html#enter">how to register and submit to the IOCCC</a>”
for instructions on registering and participating in the IOCCC, as the process has changed from previous years!
</p>
<p class="leftbar">
When the contest is <strong><a href="../faq.html#open">open</a></strong>, an
<a href="../judges.html">IOCCC judge</a> will email you your <a href="https://submit.ioccc.org">submit server</a>
<strong>Username</strong> and <strong>Initial password</strong>. This takes some time (maybe even a few days) for an
<a href="../judges.html">IOCCC judge</a> to process your registration and email you your
initial login and password.
</p>
<p class="leftbar">
Those who <a href="register.html">register</a> while the contest status is <strong><a href="../faq.html#pending">pending</a></strong>
will receive email with their <a href="https://submit.ioccc.org">submit server</a> <strong>Username</strong> and <strong>Initial password</strong>
from an <a href="../judges.html">IOCCC judge</a> shortly after the contest status becomes <strong><a href="../faq.html#open">open</a></strong>.
</p>
<p class="leftbar">
Once an <a href="../judges.html">IOCCC judge</a> emails you your <strong>Username</strong> and <strong>Initial password</strong>, you
will have 72 hours to <a href="pw-change.html">change your submit server initial password</a>.
If you do not change your <strong>Initial password</strong> in time, you will have to <a href="register.html">re-register</a>.
</p>
<p class="leftbar">
Because it takes time (maybe even a few days) for an <a href="../judges.html">IOCCC judge</a>
to process your registration and email you your initial login and password,
you should <strong>MAKE SURE</strong> you give yourself enough time before the contest closes.
In other words, <strong>DO NOT WAIT UNTIL THE FINAL DAYS</strong> of the contest to register!
The <a href="../judges.html">IOCCC judges</a> are <strong>NOT</strong> responsible for delayed or lost email,
or for those who wait until the last minute to try to register!
</p>
<p class="leftbar">
If you have <a href="register.html">registered</a> and received by email their
<a href="https://submit.ioccc.org">submit server</a> <strong>Username</strong> and <strong>Initial password</strong>
from an <a href="../judges.html">IOCCC judge</a>, you may upload your submission to
the <a href="https://submit.ioccc.org">submit server</a> only while the
contest is <strong><a href="../faq.html#open">open</a></strong>.
</p>
<p class="leftbar">
The <a href="https://submit.ioccc.org">submit server</a>, in accordance with <a href="rules.html#rule17">Rule 17</a>,
places a limit of <strong>3999971</strong> octets on the size of your upload.
</p>
<p class="leftbar">
You are <strong>STRONGLY</strong> advised to use the <code>mkiocccentry(1)</code> tool
as found in the <a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry repo</a>
to form the file to upload to the <a href="https://submit.ioccc.org">submit server</a>.
</p>
<p class="leftbar">
See the
FAQ on “<a href="../faq.html#mkiocccentry">obtaining and compiling the mkiocccentry tools</a>”
for more information about the <code>mkiocccentry(1)</code> tool.
</p>
<p class="leftbar">
While the contest is <strong><a href="../faq.html#open">open</a></strong>, you may modify your previously
uploaded submission by rebuilding your submission with the <code>mkiocccentry(1)</code> tool
and then re-uploading it to the same slot number on the <a href="https://submit.ioccc.org">submit server</a>.
</p>
<p class="leftbar">
Once the contest enters the <strong><a href="../faq.html#judging">judging</a></strong> state, you will
<strong>NOT</strong> be allowed to upload your submission files.
</p>
<p class="leftbar">
The <a href="https://submit.ioccc.org">submit server</a> will become active when the contest is <strong><a href="../faq.html#open">open</a></strong>.
Until the contest status becomes <strong><a href="../faq.html#open">open</a></strong>,
the <a href="https://submit.ioccc.org">submit server</a> may be offline and/or unresponsive.
</p>
<p class="leftbar">
See the
FAQ on “<a href="../faq.html#mkiocccentry">obtaining and compiling the mkiocccentry tools</a>”
and the
FAQ on “<a href="../quick-start.html#enter">how to enter the IOCCC</a>”
as that FAQ has important details on
<a href="register.html">how to register</a>
as well as
<a href="submit.html">how to upload your submission</a> to the IOCCC.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule4">
<h2 id="rule-4">Rule 4</h2>
</div>
<p class="leftbar">
If your submission is selected as a winning entry, then your submission may be modified in order
to fit into the structure of the <a href="https://www.ioccc.org/index.html">Official IOCCC winner website</a>.
</p>
<p class="leftbar">
For example, your submission’s <code>Makefile</code> will be modified and your <code>remarks.md</code>
will become a <code>README.md</code> which will be used to generate an <code>index.html</code> file.
</p>
<p class="leftbar">
Your source code will be the file <code>prog.c</code>. The compiled binary
will be called <code>prog</code>. If you submission requires different filenames,
then modify your submission’s <code>Makefile</code> to <strong>COPY</strong> (<strong>NOT</strong> move!)
the files accordingly.
</p>
<p class="leftbar">
See also <a href="#rule5">Rule 5</a>, <a href="#rule18">Rule 18</a> and <a href="#rule21">Rule 21</a>.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule5">
<h2 id="rule-5">Rule 5</h2>
</div>
<p>Your submission <strong>MUST</strong> not modify the content or filename of any part of your
original submission including, but not limited to <code>prog.c</code>, the <code>Makefile</code>
(that we create from your how to build instructions), as well as any data
files you submit.</p>
<p>If you submission needs (or wishes :-) ) to modify such content, it <strong>MUST</strong> first copy the
file to a new filename and then modify that copy.</p>
<p class="leftbar">
You may use your submission to form a copy, or you can make use of your <code>Makefile</code> to form that copy.
</p>
<p class="leftbar">
If you do make a copy and then modify that copy, please be sure that
the <code>clobber</code> rule of your <code>Makefile</code> removes that copy in order to
restore the contents if your submission to its original submission.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule6">
<h2 id="rule-6">Rule 6</h2>
</div>
<p class="leftbar">
I am not a rule, I am a <code>free(void *human);</code> ‼️
</p>
<p class="leftbar">
        <code>while (!(ioccc(rule(you(are(number(6)))))) {</code><br>
                <code>ha_ha_ha();</code><br>
        <code>}</code>
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule7">
<h2 id="rule-7">Rule 7</h2>
</div>
<p class="leftbar">
The obfuscated C program must be your own original work.
</p>
<p class="leftbar">
You (the author(s)) must own the contents of your submission OR
you must have permission from the owner(s) to submit their content
under the following license:
</p>
<p class="leftbar">
<strong><a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0 DEED Attribution-ShareAlike 4.0 International</a></strong>
</p>
<p>If you submit any content that is owned by others, you <strong>MUST
detail that ownership</strong> (i.e., who owns what) <strong><em>AND</em> document the
permission you obtained</strong>.</p>
<p class="leftbar">
Please note that the IOCCC size tool, the tools in the <a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry
repo</a> and the tools and library in
the <a href="https://github.com/xexyl/jparse/issues">jparse repo</a> (that the
<a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry repo</a> clones) are
<strong>NOT</strong> original works, unless of course you’re the respective authors, in
which case they are. Of course, neither are any of the previous
winning entries, unless of course you’re the winner! :-)
</p>
<p class="leftbar">
See also <a href="#rule5">Rule 5</a>, <a href="#rule18">Rule 18</a> and <a href="#rule21">Rule 21</a>.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule8">
<h2 id="rule-8">Rule 8</h2>
</div>
<p class="leftbar">
Submissions may only be uploaded to the <a href="https://submit.ioccc.org">IOCCC submit server</a>
while the contest is <strong><a href="../faq.html#open">open</a></strong>.
</p>
<p class="leftbar">
Once the contest is in the <strong><a href="../faq.html#judging">judging</a></strong> state (or <strong><a href="../faq.html#closed">closed</a></strong>),
you may <strong>NOT</strong> upload submissions.
</p>
<p class="leftbar">
While the contest is <strong><a href="../faq.html#open">open</a></strong> or in the <strong><a href="../faq.html#judging">judging</a></strong> state,
the <a href="../judges.html">IOCCC judges</a> may (but are not required to) modify the slot comment of your submission to indicate
that they have received it. If uploaded submission is malformed, the <a href="../judges.html">IOCCC judges</a>
may (but are not required to) modify the slot comment accordingly.
</p>
<p class="leftbar">
See the “<a href="#dates">Important IOCCC dates</a>” section above for when these contest states are scheduled.
</p>
<p class="leftbar">
See also <a href="#rule17">Rule 17</a>.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule9">
<h2 id="rule-9">Rule 9</h2>
</div>
<p class="leftbar">
Each person may submit up to and including <strong>10.000000</strong> (ten in base 10) entries per contest.
</p>
<p><strong>Each submission <em>must be submitted separately</em></strong>.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule10">
<h2 id="rule-10">Rule 10</h2>
</div>
<p>Entries requiring human interaction to be initially compiled <strong>are not
permitted</strong>. However, see the <a href="guidelines.html">guidelines</a>.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule11">
<h2 id="rule-11">Rule 11</h2>
</div>
<p>Programs that require special privileges (<code>setuid(2)</code>, <code>setgid(2)</code>,
super-user, special owner, special group, etc.) are still <strong>HIGHLY
DISCOURAGED</strong>. We do not guarantee these functions will behave as
you expect on our test platforms. If your program needs special
permissions you <strong>MUST</strong> document this fact, and explain why
it is needed in your submission’s <code>remarks.md</code> file.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule12">
<h2 id="rule-12">Rule 12</h2>
</div>
<p><strong>Legal</strong> abuse of the rules is somewhat encouraged. <strong>A submission that, in
the opinion of the <a href="../judges.html">judges</a>, violates the rules will be disqualified</strong>.
Submissions that attempt to abuse the rules <strong>MUST</strong> try to justify why
their rule abuse is legal, in the <code>remarks.md</code> file.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule13">
<h2 id="rule-13">Rule 13</h2>
</div>
<p class="leftbar">
7 out of 13 UTF-8 characters in C code agree that this rule number is lucky enough to be a prime number.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule14">
<h2 id="rule-14">Rule 14</h2>
</div>
<p class="leftbar">
Any C source that fails to compile because of lines with trailing
control-M’s (i.e., lines with a tailing octet <code>015</code>) <strong><em>might</em></strong> be rejected.
</p>
<p>Please do <strong>NOT</strong> put trailing control-M’s on remarks file lines.
Please check to be sure, before submitting, that you have removed
any control-M at the end of remark file lines.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule15">
<h2 id="rule-15">Rule 15</h2>
</div>
<p class="leftbar">
In order to register for the IOCCC, you <strong>MUST</strong> have a valid email address.
</p>
<p>The <a href="../judges.html">judges</a> <strong>are not responsible for delays in email</strong>, please plan
enough time for the exchange of emails so you can upload your submission.</p>
<p class="leftbar">
See the
FAQ on “<a href="../quick-start.html#register">how to register</a>”
for details.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule16">
<h2 id="rule-16">Rule 16</h2>
</div>
<p>You are <strong>STRONGLY</strong> encouraged to submit an <strong>original submission</strong>.
Submissions that are similar to previous entries are
discouraged. As we judge anonymously, submissions that have already
been published may be disqualified.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule17">
<h2 id="rule-17">Rule 17</h2>
</div>
<p class="leftbar">
Your submission must be in the form of <strong>xz compressed tarball</strong>
that <code>mkiocccentry(1)</code> tool would generate. The files, directories,
and paths must conform to the limits imposed by <code>mkiocccentry(1)</code>
including but not limited to their names, count, path length
and directory tree depth.
</p>
<p class="leftbar">
Your <strong>xz compressed tarball</strong> submission file must pass the tests performed by:
</p>
<ul>
<li><p class="leftbar">
<code>txzchk(1)</code>
</p></li>
</ul>
<p class="leftbar">
Your <strong>xz compressed tarball</strong> submission file must pass the tests performed by:
</p>
<ul>
<li><p class="leftbar">
<code>fnamchk(1)</code>
</p></li>
</ul>
<p class="leftbar">
The resulting directory produced when your <strong>xz compressed tarball</strong> submission file uncompressed,
must pass the pass the checks performed by:
</p>
<ul>
<li><p class="leftbar">
<code>chkentry(1)</code>
</p></li>
</ul>
<p class="leftbar">
The resulting <code>prog.c</code> file must pass the <a href="#rule2">Rule 2</a> size checked performed by:
</p>
<ul>
<li><p class="leftbar">
<code>iocccsize(1)</code>
</p></li>
</ul>
<p class="leftbar">
The <code>.auth.json</code> and <code>.info.json</code> must be compatible with what hat <code>mkiocccentry(1)</code> tool
would produce as well as pass the tests performed by:
</p>
<ul>
<li><p class="leftbar">
<code>jparse(1)</code>
</p></li>
</ul>
<h3 id="tldr-rule-17---use-mkiocccentry1-to-form-your-submission">TL;DR Rule 17 - Use <code>mkiocccentry(1)</code> to form your submission</h3>
<p>Let the <code>mkiocccentry(1)</code> tool form your <strong>xz compressed tarball</strong>
submission file and don’t try to override override its checks and
limits in order to be sure you submission conforms to this rule.</p>
<h3 id="warning">Warning</h3>
<p>Using command line flags or input prompts to override checks and
limits made by the above mentioned tools is <strong>NOT</strong> recommended
and may result in your submission being rejected by the <a href="https://submit.ioccc.org">IOCCC
submit server</a> and/or the [IOCCC
Judges[(../judges.html).</p>
<p class="leftbar">
See the
FAQ on the “<a href="../faq.html#mkiocccentry">mkiocccentry tool</a>
for how to obtain and use the above mentioned tools.
</p>
<p class="leftbar">
<strong>IMPORTANT</strong>: See the
FAQ on “<a href="../faq.html#rule17">Rule17</a>”
for very important details behind this rule.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule18">
<h2 id="rule-18">Rule 18</h2>
</div>
<p>The entirety of your submission must be submitted under the following license:</p>
<p class="leftbar">
<strong><a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0 DEED Attribution-ShareAlike 4.0 International</a></strong>
</p>
<p>You (the author(s)) <strong>MUST</strong> own the content of your submission <strong>OR</strong>
you <strong>MUST HAVE PERMISSION</strong> from the owner(s) to submit their content.</p>
<p>You <strong>MUST NOT</strong> submit anything that cannot be submitted under that license.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule19">
<h2 id="rule-19">Rule 19</h2>
</div>
<p class="leftbar">
The <code>remarks.md</code> file, a required non-empty file, must be written in
markdown format. See the <a href="http://daringfireball.net/projects/markdown/basics">Daring Fireball Markdown:
Basics</a>.
</p>
<p class="leftbar">
We currently use <a href="https://pandoc.org">pandoc</a> to convert markdown to HTML.
</p>
<p class="leftbar">
Please see our FAQ “<a href="../faq.html#remarks_md">remarks.md</a>” and the <a href="../markdown.html">IOCCC markdown
guidelines</a> for additional markdown guidance.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule20">
<h2 id="rule-20">Rule 20</h2>
</div>
<p>The how to build instructions must be in Makefile format. See <a href="../faq.html#make_compatibility">the FAQ about
make(1) compatibility the IOCCC
supports</a> for more details.</p>
<p class="leftbar">
You are <strong>ENCOURAGED</strong> to use the
Makefile example, renamed as <code>Makefile</code> of course, for help in constructing your
<code>Makefile</code>. See the <a href="guidelines.html#makefile">Makefile section</a> in the
guidelines for more details.
</p>
<p>The target of the Makefile must be called <code>prog</code>. The original
C source file must be called <code>prog.c</code>.</p>
<p>To invoke the C compiler, use <code>${CC}</code>. To invoke the C preprocessor use
<code>${CPP}</code>.</p>
<p>Do <strong>NOT</strong> assume that <code>.</code> (the current directory) is in the <code>$PATH</code>.</p>
<p class="leftbar">
When <code>make clobber</code> is invoked, we request that submission be restored
to its original submission state. For example, any temporary files
created during the build process, or during execution should be
removed by the <code>clobber</code> rule.
</p>
<p class="leftbar">
Your <code>Makefile</code> <strong>MUST</strong> use a syntax that is compatible with <code>bash(1)</code>
and GNU <code>make(1)</code>. You are <strong>ENCOURAGED</strong> to use set <code>SHELL= bash</code> in
your <code>Makefile</code>.
</p>
<p class="leftbar">
Assume that commands commonly found in <a href="https://en.wikipedia.org/wiki/Single_UNIX_Specification">Single UNIX
Specification</a>
environments and systems that conform to the <a href="https://en.wikipedia.org/wiki/Single_UNIX_Specification">Single UNIX
Specification</a> are
available in the <code>$PATH</code> search path.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule21">
<h2 id="rule-21">Rule 21</h2>
</div>
<p>Your submission <strong>MUST NOT</strong> create or modify files above the current directory
<em>with the exception of</em> the <code>/tmp</code> and the <code>/var/tmp</code> directories. Your submission
<strong>MAY</strong> create subdirectories below the current directory, or in <code>/tmp</code>,
or in <code>/var/tmp</code> provided that <code>.</code> is <strong>NOT</strong> the first octet in any
directory name or filename you create.</p>
<p class="leftbar">
See also <a href="#rule5">Rule 5</a>.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule22">
<h2 id="rule-22">Rule 22</h2>
</div>
<p>Catch 22:</p>
<p>Your source code, data files, remarks and program output <strong>MUST NOT</strong>
identify the authors of your code. The <a href="../judges.html">judges</a> <strong>STRONGLY PREFER</strong> to
<strong>NOT</strong> know who is submitting entries to the IOCCC.</p>
<p>Even if you are a previous IOCCC winner, catch 22 still applies.</p>
<p>Identifying the author(s) of your submission in an obvious way anywhere
within your code, data, remarks or program output (unless you are
<strong>Peter Honeyman</strong> or pretending to be <strong>Peter Honeyman</strong>) will be grounds
for disqualification of your submission.</p>
<p>Yes, Virginia, <strong>WE REALLY MEAN IT!</strong></p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule23">
<h2 id="rule-23">Rule 23</h2>
</div>
<p>This prime rule number is reserved for future use.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule24">
<h2 id="rule-24">Rule 24</h2>
</div>
<p>Even though 24 is not prime, you should still see <a href="#rule23">Rule 23</a>.</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule25">
<h2 id="rule-25">Rule 25</h2>
</div>
<p class="leftbar">
The <a href="rules.html">IOCCC rule set</a> needs more than 5^2 rules: see <a href="#rule26">Rule 26</a>.
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule26">
<h2 id="rule-26">Rule 26</h2>
</div>
<blockquote>
<p>“The quick brown fox jumps over the lazy dog”.<br>
“Pack my box with five dozen liquor jugs.”<br>
“How vexingly quick daft zebras jump!”<br>
“Sphinx of black quartz, judge my vow.”<br>
“Waltz, bad nymph, for quick jigs vex.”<br>
“Mr. Jock, TV quiz PhD, bags few lynx.”<br>
“abcdefg, hijklmnop, qrstu&amp;v, wxy&amp;z.”</p>
</blockquote>
<p>Jump to: <a href="#">top</a></p>
<div id="rule27">
<h2 id="rule-27">Rule 27</h2>
</div>
<p class="leftbar">
Unless otherwise needed, <a href="#rule27">Rule 27</a> is reserved for something cubic. :-)
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="rule28">
<h2 id="rule-28">Rule 28</h2>
</div>
<p class="leftbar">
<a href="#rule28">Rule 28</a> is a perfect way end to the list of <a href="rules.html">IOCCC rules</a>
as we do <strong>NOT</strong> plan to have <strong>496</strong> rules. :-)
</p>
<p>Jump to: <a href="#">top</a></p>
<div id="more-information">
<div id="information">
<h1 id="for-more-information">FOR MORE INFORMATION:</h1>
</div>
</div>
<p class="leftbar">
For questions or comments about the contest, see <a href="../contact.html">Contacting the IOCCC</a>.
</p>
<p class="leftbar">
<strong>Be SURE</strong> to review the <a href="index.html">IOCCC Rules and Guidelines</a> as
<a href="rules.html">IOCCC rules</a> and the <a href="guidelines.html">IOCCC guidelines</a> may (and
<strong>often do</strong>) change from year to year.
</p>
<p class="leftbar">
You should be sure you have the current <a href="rules.html">IOCCC rules</a> and
<a href="guidelines.html">IOCCC guidelines</a> prior to submitting entries.
</p>
<p>See the <a href="../news.html">Official IOCCC website news</a> for additional information.</p>
<p class="leftbar">
For the updates and breaking IOCCC news, you are encouraged to follow
the <a href="https://fosstodon.org/@ioccc">IOCCC on Mastodon</a> account. See our
FAQ on “<a href="../faq.html#try_mastodon">Mastodon</a>”
for more information. Please do note that unless
you are mentioned by us you will <strong>NOT</strong> get a notification from the app <em>so you
should refresh the page <strong>even if you do follow us</strong></em>.
</p>
<p class="leftbar">
Check out the <a href="https://www.ioccc.org/index.html">Official IOCCC winner website</a> in general.
</p>
<p class="leftbar">
See the
FAQ on “<a href="../faq.html#mkiocccentry">obtaining and compiling the mkiocccentry tools</a>”
and the
FAQ on “<a href="../quick-start.html#enter">how to enter the IOCCC</a>”
as that FAQ has important details on
<a href="register.html">how to register</a>
as well as
<a href="submit.html">how to upload your submission</a> for the IOCCC.
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<p><strong>Leonid A. Broukhis</strong><br>
<strong>chongo (Landon Curt Noll) <code>/\cc/\</code></strong></p>
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