Merge pull request #1336 from xexyl/1993-lmfjyh

Format/typo check 1993/lmfjyh
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Landon Curt Noll authored and GitHub committed 2023-11-09 13:44:44 -07:00
commit dc5af38eb9
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@@ -1,11 +1,5 @@
## To build: ## To build:
This entry will not compile with gcc < 2.3.3 as it relied on a bug which was
fixed in gcc 2.3.3 which was fixed a very long time ago now. There is an
alternate version for [those of
us](https://www.collinsdictionary.com/dictionary/english/everyone) with gcc >=
2.3.3. See Alternate code section below for more details.
If you have gcc < 2.3.3 you can build this entry like: If you have gcc < 2.3.3 you can build this entry like:
```sh ```sh
@@ -18,10 +12,16 @@ would print `Hello World!` when compiled.
For an explanation of why and how this works see the author's remarks. The gist For an explanation of why and how this works see the author's remarks. The gist
of the entry itself, however, is the file name _itself **is** the code_. of the entry itself, however, is the file name _itself **is** the code_.
NOTE: we delete the bogus file whether or not the compilation succeeds. NOTE: we delete the temporary file whether or not the compilation succeeds
because it is an unsafe filename and not doing so would cause problems for
anyone running `make`.
This entry will not compile with gcc < 2.3.3 as it relies on a bug which was
fixed in gcc 2.3.3 which was fixed a very long time ago now. There is an
alternate version for [those of
us](https://www.collinsdictionary.com/dictionary/english/everyone) with gcc >=
2.3.3. See [Alternate code](#alternate-code) section below for more details.
There is an alternate version which simply does what the program did with gcc <
2.3.3.
### Bugs and (Mis)features: ### Bugs and (Mis)features:
@@ -46,19 +46,25 @@ If you have gcc < 2.3.3 (i.e. the entry can compile):
## Alternate code: ## Alternate code:
To use: This version does what the code did but in a way that will work with modern
compilers. We'd like to say there's something special about it but there isn't.
### Alternate build:
```sh ```sh
make alt make alt
``` ```
### Alternate use:
Use `lmfjyh.alt` as you would `lmfjyh` above. Note that other code could also be Use `lmfjyh.alt` as you would `lmfjyh` above. Note that other code could also be
done with this bug; see the author's remarks for more details. done with this bug; see the author's remarks for more details.
## Judges' remarks: ## Judges' remarks:
\
There's more than one way to get around disk quotas. :-) There's more than one way to get around disk quotas. :-)
@@ -66,6 +72,7 @@ There's more than one way to get around disk quotas. :-)
"Practical and efficient method of compressing source code". "Practical and efficient method of compressing source code".
### Introduction ### Introduction
I will shortly present a totally new compression method. I will shortly present a totally new compression method.
@@ -75,6 +82,7 @@ best with C-source code.
As an example, I have taken a simple "Hello world!" program As an example, I have taken a simple "Hello world!" program
that should be familiar to all C-programmers. that should be familiar to all C-programmers.
#### Listing 1: A simple "Hello World" program #### Listing 1: A simple "Hello World" program
@@ -85,13 +93,15 @@ main()
} }
``` ```
### Packing method ### Packing method
Normally a file name is used only to identify the file, but this new Normally a file name is used only to identify the file, but this new
revolutionary method introduces a totally new concept: THE FILE NAME IS THE revolutionary method introduces a totally new concept: **THE FILE NAME _IS_ THE
PROGRAM. There is no need to waste valuable disk space to store source code. The PROGRAM**. There is no need to waste valuable disk space to store source code.
program is embedded in the file name, only a minor portion of it is inside the The program is embedded in the file name, only a minor portion of it is inside
file. the file.
#### Listing 2: Compressed "Hello world" #### Listing 2: Compressed "Hello world"
@@ -129,7 +139,7 @@ code in a source file as presented in listing 1.
In a UNIX environment it is possible to write almost any program by In a UNIX environment it is possible to write almost any program by
including the code in file names. Since `/` is used to separate including the code in file names. Since `/` is used to separate
path components and cannot therefore exist in a file name, all path components and cannot therefore exist in a file name, all
features of C-language cannot be used. features of the C language cannot be used.
In C, the `/` is used as a division operator and it may also be a In C, the `/` is used as a division operator and it may also be a
part of a comment start and end identifier. This, however, is not a part of a comment start and end identifier. This, however, is not a
@@ -155,6 +165,7 @@ Any ANSI conforming C-compiler that runs under a REAL operating
system should be able to compile the code (there might be problems system should be able to compile the code (there might be problems
with some older UNIX variants). with some older UNIX variants).
### Compilers ### Compilers
These worked: These worked:
@@ -168,17 +179,20 @@ These failed miserably:
- cc (SunOS/Solaris) - could not start cpp properly - cc (SunOS/Solaris) - could not start cpp properly
- cc/xlc (AIX) - could not open source - cc/xlc (AIX) - could not open source
### Other tools ### Other tools
#### Debuggers: (tested at SunOS 4.1.2) #### Debuggers: (tested at SunOS 4.1.2)
- dbx - Quit with a very 'informative' error message: - `dbx` - Quit with a very 'informative' error message:
"dbx: fatal error: Is a directory" `"dbx: fatal error: Is a directory"`
- gdb - Printed almost the same error message ": Is a directory". - gdb - Printed almost the same error message `": Is a directory"`.
It was, however, possible to step through the code but\ It was, however, possible to step through the code but
not list it. not list it.
#### Lints #### Lints
None of the lints tested environments were able to parse the file. None of the lints tested environments were able to parse the file.
@@ -186,14 +200,13 @@ None of the lints tested environments were able to parse the file.
### Conclusions ### Conclusions
The method can be used to compress any types of files and the The method can be used to compress any type of file and the compression ratios
compression ratios are even better when compressing other files are even better when compressing files other than C source. For example plain
than C-source. For example plain text files may be compressed with text files may be compressed with INFINITE compression ratio. It is trivial task
INFINITE compression ratio. It is trivial task to compress a 100 to compress a 100 kilobytes long text file in about 400 files whose lengths are
kilobytes long text file in about 400 files whose lengths are zero zero bytes. The drawback is that the files must be unpacked before they can be
bytes. The drawback is that the files must be unpacked before they used, so a large amount of temporary disk space is needed, while C source is
can be used, so a large amount of temporary disk space is needed, totally usable in the compressed form.
while C-source is totally usable in the compressed form.
Evidently, there is a long way to go before this new programming Evidently, there is a long way to go before this new programming
technique may be widely used, since currently there are only few technique may be widely used, since currently there are only few