Landon Curt Noll
ffb738af07
Changed the model of `status.json` model.
Updated `status.json` IOCCC_status_version from "0.2 2023-05-22"
to "1.0 2024-03-09".
Updated FAQ 2.6, improving how IOCCC entries announced.
Moved `bin/ioccc-status.sh` to `tmp/ioccc-status.sh`
now that we have a new status.json model for
which this tool no longer fits (sorry tm Canada 🇨🇦).
Added `status.md` markdown to explain the `status.json` model.
Added `status.html` to both display the contents of `status.json`
and render the contents of `status.md` as HTML.
Added `bin/status2html.sh` to convert `status.json`
into HTML for the `status.html` file.
Added `bin/gen-status.sh` to form `status.json`
and `status.html` files.
Added `make gen_status` to top level Makefile.
Performed `make www` to complete all of the above.
265 lines
11 KiB
HTML
265 lines
11 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<!-- The content of main section of this web page came from: 1994/shapiro/shapiro.md -->
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<!-- !!! Do not modify this web page, instead modify the file: 1994/shapiro/shapiro.md -->
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<head>
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<link rel="stylesheet" href="../../ioccc.css">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>The International Obfuscated C Code Contest</title>
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<meta name="description" content="shapiro.md for 1994/shapiro">
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<meta name="keywords" content="IOCCC, 1994/shapiro, shapiro.md">
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</head>
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<body>
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>shapiro.md for 1994/shapiro</h2>
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</div>
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<div class="topnav">
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<a class="Left" href="index.html">↑ jump to index.html ↑</a>
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</div>
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<div class="sidenav">
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<a href="#content">Jump to contents</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../index.html">IOCCC Home</a>
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<a href="../../years.html">Winning Entries</a>
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<a href="../../authors.html">People who have won</a>
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<a href="../../location.html">Location of authors</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../news.html">IOCCC News</a>
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<a href="../../status.html">Contest status</a>
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<a href="../../faq.html#submit">How to enter the IOCCC</a>
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<a href="../../faq.html">FAQ</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../bugs.html">Bugs & (mis)features</a>
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<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
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<a href="../../faq.html#fix_web_site">Fixing the web site</a>
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<a href="../../faq.html#fix_author">Fixing author info</a>
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<a href="../../thanks-for-help.html">Thanks for the help</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</a>
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<a href="../../contact.html">Contacting the IOCCC</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="#top">Jump to top</a>
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<a name="content"></a>
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<h1 id="hints">HINTS</h1>
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<p>For the first program (<a href="shapiro.c">shapiro.c</a>):</p>
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<p>This is a very simple program:</p>
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<pre><code> 1. #include <stdio.h>
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2. main()
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3. {
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4. int K,L,M=0;
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5. FILE *J;
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6. J=fopen(__FILE__,"r");
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7. for(;
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8. (L=getc(J))>=0;
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9. L>='J'&&L<='J'+15 &&
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10. ((M=!M)?K=L:putchar(K-'J'|(L-'J'<<4)))
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11. );
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12. exit(0);}</code></pre>
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<p>Lines 1-5 are basic stuff. Line 6 opens the source code for input.
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Line 7 is the loop. Line 8 reads in each character in the file (placed
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in <code>L</code>) while not >= 0. Line 9 is an <code>if</code>
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expression which filters out all characters not between <code>J</code>
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and <code>J + 15</code>. Line 10 uses <code>M</code> to execute two
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different paths; the first just stores the character in <code>K</code>
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and the second path combines the last two characters read in as high and
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low nibbles of a byte and outputs them. In effect this is a very poor
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ASCII to binary decoder. The last line is necessary so that make will
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not stop when it executes this program.</p>
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<p>The second program is encoded into this format and then included
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(mostly) as a comment.</p>
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<p>Notice that it is impossible to write this program while leaving 16
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contiguous ASCII characters free for the encoding. Because of this the
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second program is mostly included as a comment. However, some of the
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characters of the encoded program are also source code for the
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decoder.</p>
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<h3 id="for-the-second-program-with-time.h">For the second program (with
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time.h):</h3>
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<pre><code> 1 #include <stdio.h>
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2 #include <time.h>
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3 #define o(j,k,m,n,l) {fprintf(j,a[k],m,n,a[l]);fflush(j);}
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4 char *a[]={"%c+------------+\n","%c+%3d %-8s+\n","seconds","minutes",
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5 "hours","%s\n","\0337\033[%d;65;H%s\0338"};
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6 int b[]={0,0,17,14,11,0};
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7 main(v,c)
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8 int v;
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9 char ** c;
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10 {
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11 char d[40],*e,f=6;
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12 time_t g;
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13 FILE *h,*i;
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14 while (--f && !pipe(d) && !fork());
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15 h=fdopen(6-f<<1,"a");
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16 i=fdopen((6-f<<1)+1,"r");
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17 for(;;){
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18 if(f){
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19 fgets(d,40,i);
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20 d[strlen(d)-1]='\0';
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21 if(*d=='0'+f){ sprintf(*c,"%s\n",d+1); o(stdout,6,6-f,d+1,0) }
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22 if(*d>'0'+f) o(h,5,d,0,0)
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23 }else{
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24 time(&g);
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25 e=asctime(localtime(&g));
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26 for(v=1;v<6;v++) o(h,v!=1&&v!=6-1,v+'0',atoi(e+b[v]),v)
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27 sleep(1);
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28 }}}
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</code></pre>
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<p>Lines 1 and 2 have to be there. Think of <code>o</code> in line 3 as
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send message with <code>j</code>,<code>k</code> and <code>m</code> as
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where, format and what. Lines 4 and 5 are all the text strings. Line 6
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is the offsets into the time string for the hours, minutes and seconds.
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Lines 7-13 are basic stuff. Line 14 is the crux of the biscuit. 14 forks
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off <code>f</code> (6) processes each of which is connected to the ones
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above and below it with a Unix pipe. It was too difficult to recover the
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actual FD numbers for the pipe ends in line 14 so I regenerate them and
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<code>fdopen()</code> them (for use with the standard C library
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functions) on lines 15 and 16. Now we have six almost identical
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processes each of which has two files open, <code>h</code> and
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<code>i</code> (up and down). The only difference in each process is the
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value of <code>f</code> (<code>0 <= f < 6</code>). The five
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processes where <code>f !=0</code> are the slave processes and
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<code>f == 0</code> is the master. Line 17 says we are going to do this
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forever. Lines 18 and 23 differentiate between the master and the
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slaves.</p>
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<p>Lines 19 to 22 are the slave code. Here we read in a line of text
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from <code>i</code> (down, line 19) and remove the newline char (line
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20). On line 21 if this message is for us (if the first character is our
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number, <code>f</code>, in ASCII) we do two things:</p>
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<ol type="1">
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<li>We copy the text of the message to <code>*c</code> which is really
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<code>argv[0]</code>. If you are on the correct flavor of Unix this will
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change the output of the <code>ps(1)</code> command to the string we
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just put there.</li>
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<li>We send the message (not including the number) to
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<code>stdout</code> with format number 6
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(<code>"\0337\033[%d;65;H%s\0338"</code>) If you can read VTxxx (and I
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read books printed as ANSI/VTxxx codes for fun :-) ) you know this is
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the sequence for:</li>
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</ol>
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<pre><code>remember where we are,
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go somewhere else,
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print the message,
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and return to where we started.</code></pre>
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<p>Line 22 says if this message is not for us (the number is bigger than
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ours) send it to <code>h</code> (up).</p>
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<p>Lines 24 to 27 are the master code. Here we get the time and convert
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it to an ASCII format (lines 24 and 25). Then on line 26 we build and
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send each of the messages for the slaves. The message uses a different
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control string for the different slaves. For the first and last slave
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the message text is just <code>"%c+------------+\n"</code> (slave
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number, text, newline.) For the other slaves it is
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<code>"%c+%3d %-8s+\n"</code> (slave number, number, units, newline).
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The slave number is <code>v+'0'</code>. The number (if used) is
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<code>atoi(e+b[v])</code> and the units are just the string in the slave
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number position.</p>
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<div class="footer">
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<hr>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=#">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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