Added a number of change bars to the rules & guidelines. Recommend recommend that all markdown files in your submission observe [IOCCC markdown guidelines](../markdown.html). Made use of "_..._" consistent in the rules & guidelines. Updated some the fun guidelines. Performed some whitespace cleanup in the rules & guidelines. Changed IOCCC Rules to version **29.12 2025-12-01**. Changed IOCCC Guidelines to version **29.04 2025-12-01** Ran `make quick_www` to perform the above.
1019 lines
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HTML
1019 lines
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HTML
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Winning authors
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mobileMenuPanel.classList.remove("hide-content");
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mobileMenuPanel.classList.add("topbar-mobile-panel");
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mobileMenuPanel.classList.add("hide-content");
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mobileMenuPanel.classList.remove("topbar-mobile-panel");
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headerOpenMenuButton.classList.add("topbar-mobile-menu");
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headerOpenMenuButton.classList.remove("hide-content");
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width=300
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height=110>
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</a>
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<h1>The International Obfuscated C Code Contest</h1>
|
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<h2>IOCCC Rules</h2>
|
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</div>
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<h1 id="the-ioccc-is-closed">The IOCCC is closed</h1>
|
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<p>The IOCCC is <strong>NOT</strong> accepting new submissions at this time. See the
|
||
<a href="../years.html">IOCCC winning entries page</a> for the entries that have won the
|
||
IOCCC in the past.</p>
|
||
<p>These rules are a <strong>TENTATIVE proposal</strong> for the next IOCCC
|
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and are <strong>likely be to be updated</strong> before the next IOCCC.</p>
|
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<p>See our
|
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FAQ on “<a href="../faq.html#feedback">rules, guidelines, tools feedback</a>”
|
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as well as our
|
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FAQ on “<a href="../faq.html#question">about asking questions</a>”
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about these rules. You might also find the FAQ in general useful, especially the
|
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FAQ on “<a href="../quick-start.html#enter">how to enter the IOCCC</a>”.</p>
|
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<p>Watch both <a href="../status.html">the IOCCC status page</a> and the
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<a href="https://fosstodon.org/@ioccc"><span class="citation" data-cites="IOCCC">@IOCCC</span> mastodon feed</a> for information about
|
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future IOCCC openings.</p>
|
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<p><strong>HINT to mastodon users</strong>: You may wish to refresh the <a href="https://fosstodon.org/@ioccc"><span class="citation" data-cites="IOCCC">@IOCCC</span>
|
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mastodon feed</a> page and/or mastodon
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app from time to time to view IOCCC mastodon updates.</p>
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<h1 id="th-international-obfuscated-c-code-contest-official-rules">29th International Obfuscated C Code Contest Official Rules</h1>
|
||
<p>Copyright (c) 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 copyright and notice are included in its entirety
|
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and remains unaltered. All other uses <strong>MUST</strong> receive prior permission in
|
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writing by <a href="../contact.html">contacting the judges</a>.</p>
|
||
<h2 id="rules-version">Rules Version</h2>
|
||
<p>These IOCCC Rules are version <strong>29.12 2025-12-01</strong>.</p>
|
||
<p class="leftbar">
|
||
The <span style="font-size:28px;"><b>|</b></span> symbol indicates an <strong>change</strong> from the previous IOCCC.
|
||
</p>
|
||
<p class="leftbar">
|
||
Because the <strong>IOCCC29</strong> rules was a substantial rewrite, only <strong>important changes</strong> from <strong>IOCCC28</strong> have been marked.
|
||
</p>
|
||
<p>Reminder: be SURE to read the <a href="guidelines.html">IOCCC guidelines</a>.</p>
|
||
<div id="rule0">
|
||
<h2 id="rule-0---dates">Rule 0 - Dates</h2>
|
||
</div>
|
||
<p class="leftbar">
|
||
This IOCCC runs from <code>2025-12-03 20:25:12.045045 UTC</code> to <code>2026-03-13 17:19:23.293137 UTC</code>.
|
||
</p>
|
||
<p class="leftbar">
|
||
This contest will enter the <a href="../faq.html#pending">pending state</a> on <code>2025-12-03 20:25:12.045045 UTC</code>,
|
||
allowing people to <a href="register.html">register for the IOCCC</a>.
|
||
</p>
|
||
<p class="leftbar">
|
||
This contest will enter the <a href="../faq.html#open">open state</a> on <code>2025-12-15 18:21:24.273033 UTC</code>,
|
||
allowing people to <a href="submit.html">upload submissions</a>.
|
||
</p>
|
||
<p class="leftbar">
|
||
This contest will enter the <a href="../faq.html#judging">judging state</a> on <code>2026-03-13 17:19:23.293137 UTC</code>,
|
||
when people will no longer be allowed to upload submissions.
|
||
</p>
|
||
<p>The above <strong>dates and times may change <em>AT ANY TIME</em></strong> until the <a href="../status.html">contest status</a> is <strong>open</strong>.</p>
|
||
<p class="leftbar">
|
||
The above timestamps are in “<em>YYYY-MM-DD HH:MM:SS.micros UTC</em>” format.
|
||
</p>
|
||
<p>See <a href="../quick-start.html#enter">Entering the IOCCC: the bare minimum you need to know</a>.</p>
|
||
<p>See
|
||
FAQ on “<a href="../faq.html#feedback">How can I comment or make a suggestion on IOCCC rules, guidelines and tools?</a>”.</p>
|
||
<div id="rule1">
|
||
<div id="rule1-c">
|
||
<h2 id="rule-1---c-program">Rule 1 - C program</h2>
|
||
</div>
|
||
</div>
|
||
<p class="leftbar">
|
||
Your submission <strong>MUST</strong> be a C program.
|
||
</p>
|
||
<p>See the <a href="guidelines.html#guidelines-for-rule-1---c-program">Guidelines for Rule 1 - C program</a>.</p>
|
||
<div id="rule2">
|
||
<div id="rule2-size-restrictions">
|
||
<div id="rule2-size">
|
||
<div id="rule-2---size">
|
||
<h2 id="rule-2---size-restrictions">Rule 2 - Size restrictions</h2>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p><code>Rule 2</code> requires that your submission satisfy <strong>BOTH</strong>
|
||
<a href="rules.html#rule2a">Rule 2a (Gross Size)</a>
|
||
and
|
||
<a href="rules.html#rule2b">Rule 2b (Net Size)</a>.
|
||
During development this can be checked using <code>iocccsize(1)</code>:</p>
|
||
<pre><code> iocccsize prog.c</code></pre>
|
||
<p>See the <a href="guidelines.html#guideline-2---size">Guidelines for Rule 2 - Size restrictions</a>.</p>
|
||
<div id="rule2a">
|
||
<div id="rule2a-gross-size">
|
||
<div id="rule-2a-gross-size">
|
||
<h3 id="rule-2a---gross-size">Rule 2a - Gross Size</h3>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>The overall maximum size of your <code>prog.c</code> program source <strong>MUST NOT</strong>
|
||
exceed <strong>4993</strong> bytes.</p>
|
||
<p>See <a href="../quick-start.html#enter">Entering the IOCCC: the bare minimum you need to know</a>.</p>
|
||
<div id="rule2b">
|
||
<div id="rule2b-net-size">
|
||
<div id="rule-2b-net-size">
|
||
<h3 id="rule-2b---net-size">Rule 2b - Net Size</h3>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>When the filename of your program source (i.e., <code>prog.c</code>) 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>MUST
|
||
NOT</strong> exceed <strong>2503</strong>.</p>
|
||
<p><strong>NOTE</strong>: <code>iocccsize</code> does <strong>NOT</strong> calculate the filename length. See <a href="#rule17-mkiocccentry">Rule 17 -
|
||
Use mkiocccentry</a>.</p>
|
||
<div id="rule3">
|
||
<div id="rule3-register">
|
||
<h2 id="rule-3---register-for-the-ioccc">Rule 3 - Register for the IOCCC</h2>
|
||
</div>
|
||
</div>
|
||
<p>You <strong>MUST</strong> register, using a valid email address, in order to submit
|
||
to the IOCCC. You may register while the contest is <strong>pending</strong> or <strong>open</strong>.</p>
|
||
<p>A few days after registering, you’ll receive your UUID username and
|
||
temporary password, which you <strong>MUST</strong> change within 14 days.</p>
|
||
<p>See <a href="register.html">How to register for the IOCCC</a>.</p>
|
||
<p>See <a href="../quick-start.html#enter">Entering the IOCCC: the bare minimum you need to know</a>.</p>
|
||
<p>See <a href="guidelines.html#guideline-3---register">Guidelines for Rule 3 - Register for the IOCCC</a>.</p>
|
||
<div id="rule4">
|
||
<div id="rule4-required-files">
|
||
<h2 id="rule-4---required-files">Rule 4 - Required files</h2>
|
||
</div>
|
||
</div>
|
||
<p class="leftbar">
|
||
Your submission <strong>MUST</strong> include at least these files: <code>Makefile</code>, <code>prog.c</code>,
|
||
<code>remarks.md</code>,<code>.info.json</code>, and <code>.auth.json</code>, the latter two of which are
|
||
generated by <code>mkiocccentry(1)</code>. See <a href="#rule17-mkiocccentry">Rule 17 -
|
||
Use mkiocccentry</a>.
|
||
</p>
|
||
<p class="leftbar">
|
||
At a <strong>minimum</strong> the following requirements apply. Additional requirements
|
||
may be imposed by <code>mkiocccentry(1)</code> updates that have yet to be listed
|
||
below:
|
||
</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* <code>.info.json</code> and <code>.auth.json</code> <strong>MUST</strong> be generated by <code>mkiocccenty(1)</code>
|
||
when packing a submission. When <code>chksubmit(1)</code> is run on the submission
|
||
directory <strong>ALL</strong> tests must pass and if there is <strong>ANY</strong> problem with these
|
||
JSON files or if either is missing it will fail. See <a href="#rule17-mkiocccentry">Rule 17 - use
|
||
mkiocccentry</a>.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* The <code>Makefile</code>, <code>remarks.md</code>,<code>.info.json</code>, and <code>.auth.json</code> <strong>MUST</strong>
|
||
have a file size <strong>greater than 0</strong> and <strong>MUST</strong> have content. Note that
|
||
<code>mkiocccentry(1)</code> will check for file <strong>size</strong> but will <strong>NOT</strong> check for
|
||
content.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* Your submitted source code <strong>MUST</strong> be called <code>prog.c</code>. When the <code>Makefile</code>
|
||
compiles your code, the executable (if applicable) <strong>MUST</strong> be called <code>prog</code>.
|
||
The <code>Makefile</code> may compile your source code into other filenames as well, if you want.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* As <code>prog</code>, <code>prog.alt</code>, <code>prog.alt.o</code>, <code>prog.o</code> may be created by your
|
||
<code>Makefile</code>, your submission <strong>MUST NOT</strong> include those files in your <strong>top</strong> directory.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* Your submission may <strong>NOT</strong> have any file that starts with <code>COPYING</code>,
|
||
<code>COPYRIGHT</code>, or <code>LICENSE</code> as those files are reserved by IOCCC.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* Your submission may <strong>NOT</strong> have in the <strong>top</strong> directory: <code>prog.orig.c</code>,
|
||
<code>README.md</code> or <code>index.html</code> as those files are reserved by the IOCCC.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* Your submission may <strong>NOT</strong> have in the <strong>top</strong> directory any file
|
||
that matches a file glob pattern form <code>[0-9][0-9][0-9][0-9]_*.tar.bz2</code>
|
||
as those files are reserved by IOCCC.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* Your submission may <strong>ONLY</strong> contain files and directories. Other file
|
||
types such as symlinks, sockets etc. are <strong>NOT</strong> allowed.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* <strong>All</strong> directories <strong>MUST</strong> have permission mode of <strong>0755</strong>. All files
|
||
<strong>MUST</strong> have the file mode of <strong>0444</strong>, EXCEPT for files that
|
||
end in <code>.sh</code> which must have a mode of <strong>0555</strong>.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* All files that end in <code>.md</code> <strong>MUST</strong> be in markdown format.</p>
|
||
<p><span style="font-size:28px;"><b>|</b></span>
|
||
* All filenames are treated as case insensitive. For example, <code>REMARKS.MD</code>,
|
||
and <code>Remarks.md</code>, and <code>remarks.md</code> are considered by <code>mkiocccenty(1)</code>
|
||
to be the <strong>SAME</strong> file. When preparing a submission on a case
|
||
sensitive filesystem, ensure that the submission will work on
|
||
a case insensitive filesystem.</p>
|
||
<p class="leftbar">
|
||
<strong>NOTE</strong>: by ‘top directory’ we mean the directory with <code>prog.c</code>, <code>Makefile</code>,
|
||
<code>remarks.md</code> and the <code>mkiocccentry(1)</code> generated files <code>.auth.json</code> and
|
||
<code>.info.json</code> and <strong>NOT</strong> the <code>topdir</code> arg to <code>mkiocccentry(1)</code>.
|
||
</p>
|
||
<p class="leftbar">
|
||
<strong>NOTE</strong>: <code>mkiocccentry(1)</code> will reject any directory which has prohibited files.
|
||
</p>
|
||
<p>The <code>remarks.md</code> and <code>Makefile</code> are explained in more detail in the Guidelines.</p>
|
||
<p>See <a href="../markdown.html">IOCCC markdown guidelines</a>.</p>
|
||
<p>See <a href="rules.html#rule17-mkiocccentry">Rule 17 - Use mkiocccentry</a>.</p>
|
||
<p>See the
|
||
FAQ on “<a href="../faq.html#file_perms">What permissions may my files be and what if I need different permissions?</a>”.</p>
|
||
<p>See the <a href="guidelines.html#mkiocccentry_toolkit">Guidelines on the mkiocccentry toolkit</a>.</p>
|
||
<p>See the
|
||
FAQ on “<a href="../faq.html#makefile_details">What are the detailed recommendations for a submission Makefile?</a>”.</p>
|
||
<div id="rule5">
|
||
<div id="rule5-modifying-files">
|
||
<h2 id="rule-5---do-not-modify-submitted-files-or-filenames-or-parent-directories">Rule 5 - Do NOT modify submitted files or filenames or parent directories</h2>
|
||
</div>
|
||
</div>
|
||
<p>Your submission <strong>MUST NOT</strong> modify the filenames or content of any of your
|
||
original submission, such as <code>prog.c</code>, <code>Makefile</code>, or <strong>ANY</strong> other supplied
|
||
files. To modify files, your program can make a copy or you can use the
|
||
<code>Makefile</code> to setup working copies. Any working copies <strong>MUST</strong> be cleaned up
|
||
by the <code>Makefile</code> <code>clobber</code> target, so as to restore the directory to its
|
||
original state.</p>
|
||
<p>Your submission <strong>MUST NOT</strong> create or modify directories and files
|
||
ABOVE the current directory (with the exception of the <code>/tmp</code> and the <code>/var/tmp</code>
|
||
directories and as long as the directory name or filename does <strong>NOT</strong> start
|
||
with a <code>.</code> (dot)).</p>
|
||
<p>The <code>Makefile</code> <code>clobber</code> target <strong>MUST</strong> restore your submission to its
|
||
original form, including the removal of any created files and directories.</p>
|
||
<p class="leftbar">
|
||
Your code should be able to run under a
|
||
<a href="https://pubs.opengroup.org/onlinepubs/9799919799/">SUS environment</a>.
|
||
</p>
|
||
<div id="rule6">
|
||
<div id="rule6-free-rule">
|
||
<h2 id="rule-6---free-rule">Rule 6 - Free Rule</h2>
|
||
</div>
|
||
</div>
|
||
<p>I am <strong>NOT</strong> a Rule, I am a <code>free(void *human);</code> ‼️</p>
|
||
<pre><code> while (!(ioccc(rule(you(are(number(6)))))) {
|
||
ha(); ha(); ha();
|
||
}</code></pre>
|
||
<p>See <a href="rules.html#rule-19---prime">Rule 19 - Prime</a>.</p>
|
||
<div id="rule7">
|
||
<div id="rule7-original-work">
|
||
<h2 id="rule-7---original-work">Rule 7 - Original Work</h2>
|
||
</div>
|
||
</div>
|
||
<p class="leftbar">
|
||
You, the author(s), <strong>MUST</strong> own the contents of your submission, <strong>OR</strong>, IF you
|
||
do <strong>NOT</strong> own the work, then you <strong>MUST</strong> have permission from the original
|
||
owner(s) to its use. If you submit <strong>ANY</strong> content that is owned by others, you
|
||
<strong>MUST</strong> detail that ownership, i.e., who owns what, and document the permission
|
||
you obtained from them in your <code>remarks.md</code> file.
|
||
</p>
|
||
<p class="leftbar">
|
||
You are permitted to use tools to write your code.
|
||
</p>
|
||
<p>See <a href="rules.html#rule16-anonymous-judging">Rule 16 - Anonymous Judging</a>,
|
||
and
|
||
<a href="guidelines.html#guideline-7---original-work">Guidelines for Rule 7 - Original Work</a>.</p>
|
||
<div id="rule8">
|
||
<div id="rule8-submitting-requirements">
|
||
<h2 id="rule-8---submitting-requirements">Rule 8 - Submitting requirements</h2>
|
||
</div>
|
||
</div>
|
||
<p>The submit server will accept submissions <strong>ONLY</strong> from those who have
|
||
registered and <strong>ONLY</strong> while the contest is open.</p>
|
||
<p>The submit server places a total size limit of <strong>3999971</strong> bytes <strong>PER</strong>
|
||
submission.</p>
|
||
<p class="leftbar">
|
||
Each account has ten (<strong>10.000</strong>) submission slots (<strong>0..9)</strong>. Each submission
|
||
slot should be annotated by the server as to whether its was received,
|
||
processed, malformed, etc. Please take note of any errors, rectify,
|
||
and resubmit. In order to avoid potential packaging errors, it is <strong>highly
|
||
recommended</strong> to use <code>mkiocccentry(1)</code>, <strong>AND</strong> to check from time to time the
|
||
status on the submit server, to see if any tests run by the server failed to
|
||
validate your submission.
|
||
</p>
|
||
<p>See
|
||
<a href="rules.html#rule3-register">Rule 3 - Registering for the IOCCC</a>,
|
||
<a href="rules.html#rule15-gnu-makefile">Rule 15 - GNU Makefile</a>,
|
||
and
|
||
<a href="rules.html#rule17-mkiocccentry">Rule 17 - Use mkiocccentry</a>.</p>
|
||
<div id="rule9">
|
||
<h2 id="rule-9---no-interactive-compiling-allowed">Rule 9 - No interactive compiling allowed</h2>
|
||
</div>
|
||
<p>Entries requiring human interaction to be initially compiled are <strong>NOT</strong>
|
||
permitted. However, see the guidelines. Each entry <strong>MUST</strong> automate the
|
||
build process using <code>bash</code>, <code>gmake</code>, <code>gcc</code> and/or <code>clang</code> and other commonly
|
||
available tools under an <a href="https://pubs.opengroup.org/onlinepubs/9799919799/">SUS
|
||
environment</a>.</p>
|
||
<p><strong>NOTE</strong>: The references to <code>gmake(1)</code> can be any GNU Make compatible tool.</p>
|
||
<p><strong>NOTE</strong>: it is better to use the <code>${MAKE}</code> variable as then one may override
|
||
the make command.</p>
|
||
<p><strong>NOTE</strong>: it is better and more portable to <strong>NOT</strong> modify the <code>${CC}</code> variable
|
||
in the Makefile.</p>
|
||
<p>See <a href="rules.html#rule15-gnu-makefile">Rule 15 - GNU Makefile</a>.</p>
|
||
<div id="rule10">
|
||
<h2 id="rule-10---program-file-permissions">Rule 10 - Program file permissions</h2>
|
||
</div>
|
||
<p>Programs that require special privileges (<code>setuid(2)</code>, <code>setgid(2)</code>,
|
||
super-user, special owner, special group, etc.) are <strong>HIGHLY DISCOURAGED</strong>.
|
||
We do <strong>NOT</strong> 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, preferably close to the top.</p>
|
||
<p>Furthermore, if you need a supplementary program that you include to
|
||
have these permissions, you will also have to explain this as well, because these
|
||
bits are <strong>NOT</strong> allowed in submissions and those bits will <strong>NOT</strong> be copied by
|
||
<code>mkiocccentry(1)</code>.</p>
|
||
<p>See <a href="rules.html#rule4-required-files">Rule 4 - Required files</a>,
|
||
and
|
||
<a href="rules.html#rule5-modifying-files">Rule 5 - Do NOT modify files</a>.</p>
|
||
<div id="rule11">
|
||
<div id="rule11-legal-rule-abuse">
|
||
<h2 id="rule-11---legal-rule-abuse">Rule 11 - Legal rule abuse</h2>
|
||
</div>
|
||
</div>
|
||
<p>Legal abuse of the rules is <strong>somewhat</strong> encouraged, but comes with risks.
|
||
A submission that, in the opinion of the Judges, <strong>violates</strong> the rules <strong>WILL
|
||
BE DISQUALIFIED</strong>. Submissions that plan to abuse the rules <strong>MUST</strong> justify
|
||
why their rule abuse is legal (or interesting) in the <code>remarks.md</code> file.</p>
|
||
<p>Submission packaging abuse will <strong>NOT</strong> be tolerated and for this reason,
|
||
amongst many others, it is recommended that you use <code>mkiocccentry(1)</code>. During
|
||
development you can check your <code>prog.c</code> size limits using <code>iocccsize(1)</code>, e.g.,
|
||
<code>iocccsize -v1 prog.c</code>. Overriding problems detected by any of the IOCCC tools
|
||
risks that the submission will be rejected.</p>
|
||
<p>If you do submit a rule abusing or violating submission, then consider
|
||
also submitting an alternate version in a different submission server
|
||
slot that does <strong>NOT</strong> violate the rules in case your rule abuse excuse
|
||
is rejected.</p>
|
||
<p><strong>IMPORTANT</strong>: If you do submit such an alternate non-rule abusing
|
||
version, <strong>PLEASE</strong> indicate that in your <code>remarks.md</code> file of your non-rule
|
||
abusing version so that the Judges don’t think you uploaded a duplicate into a
|
||
wrong slot by mistake.</p>
|
||
<p>See <a href="guidelines.html#guideline-11---abuse">Guidelines for Rule 11 - Legal rule abuse</a>.</p>
|
||
<div id="rule12">
|
||
<div id="rule12-utf8">
|
||
<h2 id="rule-12---utf-8">Rule 12 - UTF-8</h2>
|
||
</div>
|
||
</div>
|
||
<p>Use of UTF-8 is supported by <code>C89</code> standard and its updates and so too by the
|
||
IOCCC.</p>
|
||
<div id="rule13">
|
||
<h2 id="rule-13---no-carriage-returns-in-prog.c">Rule 13 - No carriage returns in prog.c</h2>
|
||
</div>
|
||
<p>Any C source that fails to compile because lines contain carriage-returns
|
||
(CTRL+M, <code>\r</code>) in particular as part of DOS/Windows style newlines might
|
||
be rejected. Please do <strong>NOT</strong> put trailing CTRL+M in <code>prog.c</code>, <code>Makefile</code>,
|
||
or <code>remarks.md</code> files, but instead end lines with Unix newline (line-feed,
|
||
CTRL+J, <code>\n</code>).</p>
|
||
<p>You are permitted, in order to try and squeeze your <code>prog.c</code> under a
|
||
<a href="rules.html#rule2a-gross-size">Rule 2a Gross Size</a> and/or
|
||
<a href="rules.html#rule2b-net-size">Rule 2b Net Size</a>
|
||
limits, to <strong>NOT</strong> end source with a newline. If you
|
||
need to do this, please document that in your <code>remarks.md</code> file and if
|
||
your compiler complains about this, document this too and update your
|
||
<code>Makefile</code> to account for this.</p>
|
||
<div id="rule14">
|
||
<h2 id="rule-14---resubmitting-lost-submissions">Rule 14 - Resubmitting lost submissions</h2>
|
||
</div>
|
||
<p>Submissions that are substantially similar to previous winning IOCCC
|
||
entries are discouraged.</p>
|
||
<p>You are allowed to resubmit to a later contest, a submission that didn’t win the
|
||
IOCCC. If you do so, then you would be <strong>WELL ADVISED</strong> to try and enhance and
|
||
improve your submission. If you do resubmit something that didn’t previously
|
||
win, then you are encouraged to mention this in your <code>remarks.md</code> file as this
|
||
<strong>sometimes</strong> helps.</p>
|
||
<div id="rule15">
|
||
<div id="rule15-gnu-makefile">
|
||
<h2 id="rule-15---gnu-makefile">Rule 15 - GNU Makefile</h2>
|
||
</div>
|
||
</div>
|
||
<p class="leftbar">
|
||
The <code>Makefile</code> <strong>MUST</strong> adhere to GNU Makefile syntax. It’s highly recommended
|
||
that you copy the <a href="Makefile.example">Makefile.example</a> as a template, renaming
|
||
it to <code>Makefile</code>. The primary target of the <code>Makefile</code> <strong>MUST</strong> be <code>prog</code> and
|
||
the source file is <code>prog.c</code>. The C compiler and preprocessor <strong>MUST</strong> be
|
||
invoked using <code>${CC}</code> and <code>${CPP}</code> macros respectively.
|
||
</p>
|
||
<p>The <code>clobber</code> target <strong>MUST</strong> clean and restore the submission directory tree to
|
||
its original state, such as removing temporary files or any modified data files.
|
||
Don’t assume that <code>git</code> tool chain is installed, i.e. do <strong>NOT</strong> expect <code>git clean -f</code> to work. To be clear: do <strong>NOT</strong> use <code>git</code> to clean out files as this
|
||
can cause problems in the winner repo!</p>
|
||
<p class="leftbar">
|
||
The <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 encouraged to use <code>SHELL= bash</code> in your <code>Makefile</code>; please add a space between the <code>=</code> and
|
||
the value such as:
|
||
</p>
|
||
<pre><code> SHELL= bash</code></pre>
|
||
<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 are available in the search
|
||
<code>$PATH</code>. Avoid command options that aren’t part of
|
||
<a href="https://en.wikipedia.org/wiki/Single_UNIX_Specification">SUS</a>, such as
|
||
GNU long name options (such as <code>--example</code>) or extensions like <code>grep -P</code>.
|
||
</p>
|
||
<p>Do <strong>NOT</strong> assume that <code>.</code> (current directory) is in the <code>$PATH</code> environment variable.</p>
|
||
<p>See <a href="rules.html#rule4-required-files">Rule 4 - Required files</a>.</p>
|
||
<p>See
|
||
FAQ on “<a href="../faq.html#makefile_details">What are the detailed recommendations for a submission Makefile?</a>”.</p>
|
||
<p>See <a href="guidelines.html#guideline-15---building">Guidelines for Rule 15 - GNU Makefile</a>.</p>
|
||
<div id="rule16">
|
||
<div id="rule16-anonymous-judging">
|
||
<h2 id="rule-16---anonymous-judging">Rule 16 - Anonymous judging</h2>
|
||
</div>
|
||
</div>
|
||
<p>Your source code, data files, remarks, and program output <strong>MUST NOT</strong>
|
||
identify the author(s) of your code (unless you are <strong>Peter Honeyman</strong>
|
||
or pretending to be <strong>Peter Honeyman</strong>). In order to be impartial the
|
||
<a href="https://www.ioccc.org/judges.html">Judges</a> do <strong>NOT</strong> know who is submitting
|
||
programs to the IOCCC until final selection is made, and <strong>only</strong> submissions
|
||
that won.</p>
|
||
<p>Even if you are a past winner, you <strong>MUST NOT</strong> reveal your identity
|
||
deliberately or by accident anywhere in your submission. <strong><em>Failure to comply
|
||
may result in the submission being disqualified</em></strong>.</p>
|
||
<div id="rule17">
|
||
<div id="rule17-mkiocccentry">
|
||
<h2 id="rule-17---use-mkiocccentry">Rule 17 - Use <code>mkiocccentry</code></h2>
|
||
</div>
|
||
</div>
|
||
<p>TL;DR: use <code>mkiocccentry(1)</code> to package your submission.</p>
|
||
<p>The files, directories, and paths <strong>MUST</strong> conform to the limits imposed by
|
||
<code>mkiocccentry(1)</code>, including but <strong>NOT</strong> limited, to their names, count, path
|
||
length, directory tree depth, and permissions.</p>
|
||
<p class="leftbar">
|
||
The submission tree may have at most <strong>13</strong> directories and maximum
|
||
directory depths of <strong>4</strong>. The maximum number of files, excluding
|
||
<code>prog.c</code>, <code>remarks.md</code>, <code>Makefile</code>, <code>prog.alt.c</code>, <code>try.sh</code>, <code>try.alt.sh</code>,
|
||
<code>.info.json</code> and <code>.auth.json</code> is <strong>31</strong>. And the maximum file-path
|
||
component is <strong>38</strong> and maximum path length is <strong>60</strong>.
|
||
</p>
|
||
<p>The submission <strong>MUST</strong> be a <code>.txz</code> compressed tarball (i.e., tarball compressed by <code>xz(1)</code>)
|
||
as constructed by <code>mkiocccentry(1)</code>, which <strong>MUST</strong> be within <strong>[1..3999971]</strong> bytes in size.</p>
|
||
<p>The tarball <strong>MUST</strong> be a <strong>v7 format</strong> tarball, and any supplementary tarballs
|
||
you provide <strong>MUST</strong> also be <strong>v7 format</strong>.</p>
|
||
<p>The sum of all file lengths, after unpacking from the tarball, <strong>MUST</strong> be
|
||
less than <code>27651*1024</code> (<strong>28314624</strong>) bytes.</p>
|
||
<p class="leftbar">
|
||
The submission <strong>MUST</strong> pass all <code>txzchk(1)</code> checks, and the tarball filename
|
||
<strong>MUST</strong> pass all <code>fnamchk(1)</code> checks as well.
|
||
</p>
|
||
<p class="leftbar">
|
||
You may <strong>NOT</strong> submit a tarball created by the <code>-d</code>, <code>-e</code> <strong>OR</strong> by the <code>-s seed</code> options of <code>mkiocccentry(1)</code>.
|
||
</p>
|
||
<p class="leftbar">
|
||
The unpacked submission directory <strong>MUST</strong> pass the checks performed by the
|
||
minimum required version of <code>chksubmit(1)</code>.
|
||
</p>
|
||
<p class="leftbar">
|
||
Submissions may <strong>NOT</strong> use a <a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry
|
||
toolkit</a> command line options that
|
||
are labelled as “<strong>for TESTING purposes</strong>”, <strong>OR</strong> labelled as “<strong>for the use by
|
||
the IOCCC judges only</strong>”, in their respective man pages.
|
||
</p>
|
||
<p class="leftbar">
|
||
Submissions may <strong>ONLY</strong> use <a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry
|
||
toolkit</a> command lines that confirm
|
||
to the command’s <code>-h</code> “<em>print help message</em>”, again notwithstanding the options
|
||
for testing and the IOCCC judges.
|
||
</p>
|
||
<p class="leftbar">
|
||
The <code>prog.c</code> file should pass the <a href="rules.html#rule2-size">Rule 2 - Size</a>
|
||
checks performed by <code>iocccsize(1)</code>.
|
||
</p>
|
||
<p class="leftbar">
|
||
The <code>.auth.json</code> and <code>.info.json</code> files <strong>MUST</strong> be compatible with what
|
||
<code>mkiocccentry(1)</code> generates.
|
||
</p>
|
||
<p class="leftbar">
|
||
Any submission that fails to pass the checks performed by the minimum required
|
||
version of the <a href="https://github.com/ioccc-src/mkiocccentry">mkiocccentry toolkit</a>
|
||
<strong>WILL be rejected</strong>!
|
||
</p>
|
||
<p>See <a href="rules.html#rule4-required-files">Rule 4 - Required files</a>.</p>
|
||
<p>See the
|
||
FAQ on “<a href="../faq.html#mkiocccentry">What is the mkiocccentry tool, how do I obtain it and how do I use it?</a>”.</p>
|
||
<p>See the <a href="guidelines.html#guideline-17---packaging">Guidelines for Rule 17 - Use mkiocccentry</a>.</p>
|
||
<div id="rule18">
|
||
<h2 id="rule-18---submission-license">Rule 18 - Submission license</h2>
|
||
</div>
|
||
<p>The entirety of your submission <strong>MUST</strong> be submitted under the following license:</p>
|
||
<p><a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0 DEED Attribution-ShareAlike 4.0 International</a></p>
|
||
<p>See <a href="rules.html#rule-7---original-work">Rule 7 - Original Work</a>.</p>
|
||
<div id="rule19">
|
||
<h2 id="rule-19---prime">Rule 19 - Prime</h2>
|
||
</div>
|
||
<p class="leftbar">
|
||
This 19th rule, while prime, is reserved for future abuse 😁.
|
||
Additional rules, both humorous and otherwise, may be added
|
||
below this rule in future contests.
|
||
</p>
|
||
<p>See <a href="rules.html#rule6-free-rule">Rule 6 - Free Rule</a>.</p>
|
||
<h2 id="further-reading">Further Reading</h2>
|
||
<p>Please read the <a href="guidelines.html">Guidelines</a> next for further commentary on these rules.</p>
|
||
<p>Read the
|
||
<a href="https://www.ioccc.org/quick-start.html#enter">Entering the IOCCC: the bare minimum you need to know</a>
|
||
for an overview of how to enter the contest.</p>
|
||
<p>See also the <a href="../faq.html">FAQ</a>.</p>
|
||
<p>And now <a href="guidelines.html#fun">for something completely different</a>.</p>
|
||
<p>Consider joining the <a href="https://discord.com/invite/Wa42Qujwnw">IOCCC Discord Server</a>
|
||
for discussions about The Rules, questions for the Judges, and <code>C</code> in general.</p>
|
||
<p>Leonid A. Broukhis
|
||
chongo (Landon Curt Noll) /\cc/\
|
||
<!-- AFTER: last line of markdown file: next/rules.md --></p>
|
||
|
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<!--
|
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||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
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|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
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target="_blank"
|
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rel="license noopener noreferrer"
|
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style="display:inline-block;">CC BY-SA 4.0</a></b>.
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
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src="../png/cc.png"
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alt="cc inside circle symbol">
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
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src="../png/by.png"
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alt="person inside circle symbol">
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
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src="../png/sa.png"
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alt="arrow looping back on itself inside circle symbol"><br>
|
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You should <b>carefully review</b> the
|
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<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
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before using the licensed material.<br>
|
||
You may wish to review the
|
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<b><a href="../license.html"
|
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target="_blank"
|
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rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
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of <b>CC BY-SA 4.0</b>.<br>
|
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</p>
|
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</div>
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||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2Fnext%2Frules.html" rel="nofollow">Nu HTML check this web page</a><br>
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