Files
ioccc/1990/dg
Landon Curt Noll cc73503c10 add experimental rules to build web site
We add to the top level Makefile, some initial rules that
will facilitate the building of HTML content.

The `bin/md2html.sh` tool as been updated to output HTML comments
about the output during HTML phases 20, 21 and 22.

All entry `index.html` files were updated with some additional HTML
comments as a result of the above.  The top level `location.html`,
`years.html` and `authors.html` have had HTML comments added also
a result.

Sorry (tm Canada 🇨🇦) for the mass update of entry `index.html` files.
Hopefully the times when all of them (often) need to be updated
will soon draw to a close.
2024-02-12 15:11:56 -08:00
..
2024-02-01 14:35:49 -08:00
2023-07-06 21:49:38 -07:00
2023-12-26 09:00:03 -08:00
2024-01-15 04:29:39 -08:00
2024-01-12 09:08:31 -08:00

To build:

make all

To use:

echo foo bar | ./dg

Try:

./try.sh

Judges' remarks:

Some C preprocessors got confused about single quotes in certain cases. In particular, the following source line:

b12(ase(bco(acp(bi(acp(bcp(acp(bpl(aqu(bqu(A))))))))))))))))))))))))))))))

sometimes has to be changed to:

b12(ase(bco(acp(bi(acp(bcp(acp(bpl('A'))))))))))))))))))))))))))))

particularly if the C preprocessor botches single quotes in cpp expansions, which we have done for the wider audience.

Author's remarks:

If my preprocessor could hack it, I could write this as one single line rather than 4, but when I do that I get a complaint "defines nested too deeply".

Obfuscation spoiler:

This is another rot13 job (believe it or not) - the #defines are a novel way of adding tokens: #define b12(x) 12 x means that at some point in the source a 12 is followed by the compressed nested #defines. The b12 gets the previous compression as an argument, and prepends the 12, thus making another step in the recreation of the source. The axx() #defines do the same, but add tokens after.

As for the rot13 algorithm, it relies on index(3) to find if the character is in the set A-Za-z. l[] is an array that gets filled with:

"nopqrstuvwxyzzzzabcdefghijklmmmmNOPQRSTUVWXYZZZZABCDEFGHIJKLMMMM"

If index(3) says the char is in the alphabet, then XOR the offset with 16 to translate, and output, otherwise pass it unchanged.

This file is Copyright (c) 2023 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/