Created `quick-start.md` to hold the FAQ 0.0 content. Used `sgit(1)` to change: * faq.html#enter ==> quick-start.html#enter * faq.html#enter_questions ==> quick-start.html#enter_questions * faq.html#step_0 ==> quick-start.html#step_0 * faq.html#step_1 ==> quick-start.html#step_1 * faq.html#step_2 ==> quick-start.html#step_2 * faq.html#register ==> quick-start.html#register * faq.html#step_3 ==> quick-start.html#step_3 * faq.html#step_4 ==> quick-start.html#step_4 * faq.html#step_5 ==> quick-start.html#step_5 * faq.html#step_6 ==> quick-start.html#step_6 * faq.html#step_7 ==> quick-start.html#step_7 * faq.html#step_submit ==> quick-start.html#step_submit Via: ```sh sgit -e 's/faq\.html#enter/quick-start.html#enter/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#enter_questions/quick-start.html#enter_questions/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_0/quick-start.html#step_0/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_1/quick-start.html#step_1/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_2/quick-start.html#step_2/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#register/quick-start.html#register/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_3/quick-start.html#step_3/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_4/quick-start.html#step_4/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_5/quick-start.html#step_5/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_6/quick-start.html#step_6/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_7/quick-start.html#step_7/g' '*.md' '*.hdr' 'inc/*.html' sgit -e 's/faq\.html#step_submit/quick-start.html#step_submit/g' '*.md' '*.hdr' 'inc/*.html' ``` The former FAQ 0.0 section in `faq.html` now just refers to `quick-start.html`. Modified menu and non-JS menu so that "Enter the IOCCC" refers to `quick-start.html`. Changed `bin/gen-top-html.sh` VERSION from "1.4.10 2024-11-23" to "1.4.11 2025-01-09". Performed `make www` on macOS to complete the above.
726 lines
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HTML
726 lines
28 KiB
HTML
<!DOCTYPE html>
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Winning entries
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Fixing entries
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Updating author info
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Thanks for the help
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Status
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News
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Contest status
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Rules and guidelines
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Markdown guidelines
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Security policy
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<div class="mobile-menu-wrapper">
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FAQ
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<a class="mobile-submenu-item" href="../../faq.html">
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Frequently Asked Questions
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</a>
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<a class="mobile-submenu-item" href="../../quick-start.html#enter">
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Enter the IOCCC
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#compiling">
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Compiling entries
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#running_entries">
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Running entries
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<a class="mobile-submenu-item" href="../../faq.html#help">
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How to help
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About
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Home page
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About the IOCCC
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The Judges
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Contact us
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<script>
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var headerOpenMenuButton = document.getElementById("header-open-menu-button");
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var mobileMenuPanel = document.getElementById("mobile-menu-panel");
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headerOpenMenuButton.addEventListener("click", () => {
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headerOpenMenuButton.classList.remove("topbar-mobile-menu");
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headerOpenMenuButton.classList.add("hide-content");
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headerCloseMenuButton.classList.remove("hide-content");
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headerCloseMenuButton.classList.add("topbar-mobile-menu");
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mobileMenuPanel.classList.remove("hide-content");
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mobileMenuPanel.classList.add("topbar-mobile-panel");
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});
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headerCloseMenuButton.addEventListener("click", () => {
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headerCloseMenuButton.classList.remove("topbar-mobile-menu");
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headerCloseMenuButton.classList.add("hide-content");
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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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<!-- END: this line ends content from: inc/topbar.default.html -->
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<!-- START: this line starts content from: inc/header.default.html -->
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<div class="header">
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<a href="../../2011/zucker/index.html">
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<img src="../../png/ioccc.png"
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alt="IOCCC image by Matt Zucker"
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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>1992/adrian - Most educational</h2>
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<h3>grep-like utility using a state machine transition language</h3>
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</div>
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<!-- END: this line ends content from: inc/header.default.html -->
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<!-- START: this line starts content from: inc/navbar.mid.html -->
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<div class="navbar">
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<a class="Left" href="../../1991/westley/index.html">← 1991/westley</a>
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<a class="Left" href="../index.html">↑ 1992 ↑</a>
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<a class="Left" href="../albert/index.html">1992/albert →</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1992%2Fadrian%2Findex.html">✓</a>
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</div>
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<div class="content" id="content">
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Adrian_Mariano">Adrian Mariano</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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</ul>
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<!-- BEFORE: 1st line of markdown file: 1992/adrian/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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||
<blockquote>
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||
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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||
</blockquote>
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<p>For more detailed information see <a href="../../bugs.html#1992_adrian">1992/adrian in bugs.html</a>.</p>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<p>For the slow minded, try:</p>
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<pre><code> ./adsleep 32767</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Once you get past the obfuscation, you have an opportunity to learn
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about regular expressions and state machines.</p>
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<p><strong>NOTE</strong>: Some compilers have had trouble optimizing this entry.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="adrians-grep-adgrep">ADrian’s GREP (adgrep)</h3>
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<p>For those confused by the complexity of full-blown <code>egrep(1)</code> style regular
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expressions, this program offers an alternative. It implements an equivalent
|
||
search, using a deterministic finite automaton.</p>
|
||
<p>A deterministic finite automaton consists of a finite set of states,
|
||
along with transition rules to move from one state to another, an initial
|
||
state, and a set of accepting states. The automaton takes a string as
|
||
input and begins in the start state. It reads a character of the string
|
||
and consults the rules for the current state, moving to the new state
|
||
indicated by the appropriate rule. This process is repeated until the
|
||
string is consumed. If the current state at this point is one of the
|
||
accepting states, then the string is accepted.</p>
|
||
<p>The deterministic finite automaton is specified as a series of rules for
|
||
each state:</p>
|
||
<pre><code> <state> chars1 <dest1> chars2 <dest2> ...</code></pre>
|
||
<p><code>chars1</code> is a list of characters (<em>only the first 8</em> are significant) which
|
||
should trigger a transition to <code><dest1></code>. <code><dest1></code> is another state which
|
||
should have a similar specification somewhere. A state is accepting if
|
||
it is specified in square brackets: <code>[final]</code>; state strings are
|
||
significant to only eight characters like <code>chars1</code>.</p>
|
||
<h3 id="example-1-matches-abc">Example 1: matches <code>^abc$</code></h3>
|
||
<pre><code> <q0> a <q1> The first state to
|
||
appear is the
|
||
start state
|
||
<q1> b <q2>
|
||
<q2> c [q3]
|
||
[q3]</code></pre>
|
||
<p>Technically, a deterministic finite automaton should have a rule for each
|
||
possible input character at each state. To simplify descriptions of the
|
||
automata, if no rule is present, the string will not be accepted. Also,
|
||
the <code>.</code> character matches any character if it occurs first in the
|
||
character list.</p>
|
||
<h3 id="example-2-abc">Example 2: <code>^abc</code></h3>
|
||
<pre><code> <q0> a <q1>
|
||
<q1> b <q2>
|
||
<q2> c [q3]
|
||
[q3] . [q3]</code></pre>
|
||
<h3 id="example-3-abc">Example 3: <code>abc$</code></h3>
|
||
<pre><code> <q0> a <q1> . <q0>
|
||
<q1> b <q2> a <q1> . <q0>
|
||
<q2> c [q3] a <q1> . <q0>
|
||
[q3] . <q1></code></pre>
|
||
<h3 id="example-4-abc">Example 4: <code>^(abc)*$</code></h3>
|
||
<pre><code> [q0] a <q1>
|
||
<q1> b <q2>
|
||
<q2> c [q0]</code></pre>
|
||
<h3 id="example-5-abcdef">Example 5: <code>^[ab][cd][ef]$</code></h3>
|
||
<pre><code> <q0> ab <q1>
|
||
<q1> cd <q2>
|
||
<q2> ef [q3]
|
||
[q3]</code></pre>
|
||
<h3 id="example-6-abcefg">Example 6: <code>^(abc|efg)$</code></h3>
|
||
<pre><code> <q0> a <q1> e <q3>
|
||
<q1> b <q2>
|
||
<q2> c [q5]
|
||
<q3> f <q4>
|
||
<q4> g [q5]
|
||
[q5]</code></pre>
|
||
<p>With the automaton specification in <code>filename</code>, invoke the program by
|
||
typing</p>
|
||
<pre><code> ./adrian filename</code></pre>
|
||
<p>It will read the file and print out all the lines which the automaton
|
||
accepts. If the file cannot be opened, a system error message will
|
||
be printed. If the input contains errors, then an error message along
|
||
with the number of the offending line will be printed to stderr. The
|
||
number of rules for each state is limited to 17. If more than 17 rules
|
||
are present, you get the error <code>too_many_rules</code>, and the state that was
|
||
being processed is printed. Error <code>no_destination</code> occurs if you specify a
|
||
set of characters, but no destination state, and error <code>too_many_states</code>
|
||
occurs if your automaton has more than 257 states.</p>
|
||
<p>Running:</p>
|
||
<pre><code> ./adrian from < your_mailbox</code></pre>
|
||
<p>will perform a function similar to that of the unix <code>from</code> command.</p>
|
||
<p>If no filename is specified on the command line, then <code>__FILE__</code> is used as the
|
||
specification for the automaton. (Originally this was <code>"adgrep.c"</code> but the file
|
||
was renamed to <code>adrian.c</code> by the judges and for more portability the arg was
|
||
changed to <code>__FILE__</code>.) In this case, the program will search for matches to
|
||
the regular expression:</p>
|
||
<pre><code> ^.[^|C][^w[Q]*(Q|[w[]c).*|^.[C|]$</code></pre>
|
||
<p>I suggest using <code>adrian.c</code> as input, and storing the output in <code>adwc.c</code>:</p>
|
||
<pre><code> ./adrian < adrian.c > adwc.c</code></pre>
|
||
<p>Compiling the new file, <code>adwc.c</code>, yields a clone of the unix <code>wc</code> command. It
|
||
runs on one file, defaulting to <code>"adrian.c"</code> if no file is given (again, this
|
||
was changed to be <code>__FILE__</code>) and displays the number of lines, words, and bytes
|
||
in the input file.</p>
|
||
<p>Another possibly interesting automaton can be created by slightly
|
||
adjusting the <code>adrian.c</code> file. Change the first line to read</p>
|
||
<pre><code> /* . echo| . */</code></pre>
|
||
<p>and repeat the process above</p>
|
||
<pre><code> ./adrian <adrian.c > adecho.c</code></pre>
|
||
<p>The new file now contains all lines which match</p>
|
||
<pre><code> ^.[^5|m^]*[m^]\([e=p,;]|[^e=+p,;].*\)$</code></pre>
|
||
<p>Compile and run. This is an <code>echo(1)</code> clone. Note the efficient algorithm
|
||
employed.</p>
|
||
<p>Two other adjustments to the first line also yield useful results. By
|
||
changing it to</p>
|
||
<pre><code> /* . head; . */</code></pre>
|
||
<p>you can search for matches to</p>
|
||
<pre><code> ^.[^W]*W..*$</code></pre>
|
||
<p>By some freak happenstance, lines of <code>adrian.c</code> which match this regular
|
||
expression form a unix <code>head(1)</code> command. It prints the first ten lines of
|
||
the file specified on the command line or <code>adrian.c</code> if no file is
|
||
specified (again this was changed to <code>__FILE__</code>).</p>
|
||
<p>By setting the first line to</p>
|
||
<pre><code> /* . basename . */</code></pre>
|
||
<p>a clone of the unix <code>basename(1)</code> command can be unearthed. The automaton will
|
||
search for</p>
|
||
<pre><code> ^.[^j]*jr.*$</code></pre>
|
||
<p>on standard input. And the program which results by running <code>adrian.c</code>
|
||
through this filter requires two parameters. The first is meant to be a
|
||
filename, and the second, an extension. All leading pathname components
|
||
are removed from the filename, and the extension is removed if present.
|
||
The resulting base name is printed to stdout.</p>
|
||
<p>Lastly, by setting the first line to</p>
|
||
<pre><code> /* . sleep . */</code></pre>
|
||
<p>you can search for</p>
|
||
<pre><code> ^.[^(~][^s]*sl.*$</code></pre>
|
||
<p>Filtering <code>adrian.c</code> through this search yields a clone of the <code>sleep(1)</code>
|
||
command. Invoke with a single integer parameter, and it will pause for that
|
||
many seconds.</p>
|
||
<p>If either <code>adbasename</code> or <code>adsleep</code> is invoked with too few parameters,
|
||
the program will print the error message:</p>
|
||
<pre><code> Segmentation fault (core dumped)</code></pre>
|
||
<p>(The exact text of the above error messages varies from machine to
|
||
machine.) The four programs which read from <code>stdin</code> require lines
|
||
shorter than 999 characters.</p>
|
||
<p>The other info files are <code>adrian.grep.[1-6]</code> which contain the six
|
||
examples that appear above, and from, which is used to emulate the
|
||
unix <code>from</code> command. For reasons of clarity, the name <code>"from"</code> should
|
||
probably not be changed if possible. I wouldn’t want to be accused of
|
||
confusing people by giving the input files weird names.</p>
|
||
<p>If you want to change the default input filename (line 80) you must be
|
||
careful to choose a name that doesn’t match the wrong search patterns,
|
||
introducing extra lines into one of the programs (again, this was changed to be
|
||
<code>__FILE__</code>).</p>
|
||
<p>The program will produce at least one warning and possible several
|
||
when compiled depending on the compiler.</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 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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|
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|
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1992adrian">Inventory for 1992/adrian</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.c">adrian.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.orig.c">adrian.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.1">adrian.grep.1</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.2">adrian.grep.2</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.3">adrian.grep.3</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.4">adrian.grep.4</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.5">adrian.grep.5</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.from">adrian.grep.from</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/adrian.grep.try">adrian.grep.try</a> - agrep script</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1992_adrian.tar.bz2">1992_adrian.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/adrian/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
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</h4>
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<!-- START: this line starts content from: inc/footer.inventory.html -->
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||
|
||
<!--
|
||
|
||
Copyright © 1984-2024 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/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 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"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
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"
|
||
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"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<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>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1992%2Fadrian%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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