Cody Boone Ferguson
45fb924ecf
With a tip from Leo the missing alt code has been added to the website. Ta, Leo (🦁⭐️🌌)!
132 lines
3.3 KiB
Markdown
132 lines
3.3 KiB
Markdown
## To build:
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``` <!---sh-->
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make all
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```
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There is an alternate version that is unobfuscated, provided by the author. See
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[Alternate code](#alternate-code) below.
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### Bugs and (Mis)features:
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The current status of this entry is:
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> **STATUS: INABIAF - please DO NOT fix**<br>
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For more detailed information see [1994/shapiro in bugs.html](../../bugs.html#1994_shapiro).
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## To use:
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``` <!---sh-->
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./shapiro &
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```
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Now find the clock in the same terminal window (or console if at the console).
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## Try:
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``` <!---sh-->
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./shapiro
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^Z
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bg
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ps x
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fg
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^C
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./shapiro_t1
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```
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Notice what you see in the output of `ps`! Observe too what happens after you
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bring it back to the foreground.
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## Alternate code:
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This version, [shapiro.alt.c](%%REPO_URL%%/1994/shapiro/shapiro.alt.c), is an
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unobfuscated version provided by the author.
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## Alternate build:
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``` <!---sh-->
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make alt
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```
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### Alternate use:
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Use `shapiro.alt` as you would `shapiro` above.
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## Judges' remarks:
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This entry has many different levels of obfuscation, and yet the
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source file is self documenting. :-)
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From time to time, run `ps(1)` and look at the new processes.
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If you want more information on the internals of this program, see
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[shapiro.html](shapiro.html).
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## Author's remarks:
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The basic theme (pun) of this program is:
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> "This **time** (everything) is not where it should be."
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### NOTICE to those who wish for a greater challenge:
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**If you want a greater challenge, don't read any further**:
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just try to understand the program via the source.
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If you get stuck, come back and read below for additional hints and information.
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My entry, [shapiro.c](%%REPO_URL%%/1994/shapiro/shapiro.c), is mostly comments, formatted in the shape of a
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clock. If you strip out the comments and look at the code you will
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quickly realize that the comments were the important part and that
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the code does very little (see pun above). It writes (to `stdout`)
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another C program (`shapiro_t2.c`). This is the first level of
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obfuscation.
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The second program (`shapiro_t2.c`) prints a clock in the upper right hand
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corner of your VTxxx/ANSI display.
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Most of the surface obfuscation in the second program,
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`shapiro_t2.c`, was an attempt to make it as small as possible.
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You should be able to see around this with `cb(1)` and some more intelligent
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variable names. Once you get past this you will realize that the third level of
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obfuscation is a six member client/server hierarchy. (See the
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[shapiro.html](shapiro.html) web page for a detailed description of the algorithm.)
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`lint` complains about: precedence confusion, `K` may be used before set,
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`main()` returns random value to invocation environment, value type used
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inconsistently, value type declared inconsistently, function argument
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(number) used inconsistently, function returns value which is always
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ignored, function returns value which is sometimes ignored.
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All of which are harmless (famous last words).
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This may or may not work on non ASCII systems (I could not find one to
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test it on.)
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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