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Fixes in 2019/diels-grabsch1

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Make author's statement that the entry cleanly compiles true. :-)
(main() was declared 'int main()').

Format fixes in README.md.

Add guidelines.txt as the author uses it in an example command.

Update .gitignore with files created by the commands suggested.
This commit is contained in:
Cody Boone Ferguson committed 2023-04-03 06:42:13 -07:00
1 parent 227f02a65f
commit 7b44ab1d64
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+997 -20
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2019/diels-grabsch1/README.md
+31 -19
View File
@@ -1,7 +1,7 @@
# Best small program
Volker Diels-Grabsch
<https://njh.eu>
Volker Diels-Grabsch
<https://njh.eu>
## To build:
@@ -9,6 +9,12 @@
make
```
[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made the author's
statement that the entry compiles cleanly true by fixing `warning: a function
declaration without a prototype is deprecated in all versions of C ` (in
main()). Not strictly necessary but if he's making fixes he might as well. Thank
you Cody!
## To run:
```sh
@@ -22,6 +28,7 @@ dd bs=1024 count=2048 < /dev/zero | compress > ref.Z
dd bs=1024 count=2048 < /dev/zero | ./prog > dg1.Z
cmp ref.Z dg1.Z
cd ../mills ; make ; cd ../diels-grabsch1
compress < ../mills/Shakespeare.txt > ref.Z
./prog < ../mills/Shakespeare.txt > dg1.Z
cmp ref.Z dg1.Z # Oops, the files differ
@@ -30,40 +37,45 @@ zcat < dg1.Z | cmp - ../mills/Shakespeare.txt # Decompresses correctly. What is
## Judges' comments:
Finally, IOCCC now has its own text compression program, and it is short
enough to qualify for the Best Short Program award! That said, can you
compress it down to a one-liner, still producing files in the UNIX compress format,
albeit sacrificing the compression ratio?
Finally, IOCCC now has its own text compression program, and it is short enough
to qualify for the Best Short Program award! That said, can you compress it down
to a one-liner, still producing files in the UNIX compress format, albeit
sacrificing the compression ratio?
Can you explain why the zero file compresses identically by the entry and the
standard compress tool, but the text file compresses differently? The judges know. :)
standard compress tool, but the text file compresses differently? The judges
know. :)
## Author's comments:
### A tiny "compress" tool
### A tiny "compress" tool:
`Usage:`
#### Usage:
```sh
./prog < input.txt > input.txt.Z
```
#### Example:
```sh
./prog < guidelines.txt > guidelines.txt.Z
```
`Check for correctness:`
#### Check for correctness:
```sh
zcat guidelines.txt.Z > guidelines2.txt
diff -s guidelines.txt guidelines2.txt
```
`Of course you can`
`also use 2015/mills2 instead of zcat to verify the output`
`file. The achieved compression ratio roughly matches that`
`of the classic Unix compress tool. And the source code is`
`very compressed, too: It has exactly the same size as the`
`paragraph you are reading right now. And exactly the same`
`shape. Nevertheless, it is portable C99 code that runs on`
`32-bit and 64-bit platforms. It compiles without warnings`
`on both GCC and Clang even with -Wextra and -Weverything.`
Of course you can also use [2015/mills2](/2015/mills2/mills2.c) instead of
`zcat` to verify the output file. The achieved compression ratio roughly matches
that of the classic Unix compress tool. And the source code is very
compressed, too: It has exactly the same size as the paragraph you are reading
right now. And exactly the same shape. Nevertheless, it is portable C99 code
that runs on 32-bit and 64-bit platforms. It compiles without warnings on both
GCC and Clang even with `-Wextra and -Weverything`.
## Copyright and CC BY-SA 4.0 License: