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Merge pull request #234 from xexyl/2018-yang

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Landon Curt Noll authored and GitHub committed 2023-03-31 11:32:20 -07:00
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2018/yang/.gitignore
+4 -3
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@@ -4,9 +4,10 @@ generated3.c
generated4.c generated4.c
generated5.c generated5.c
left left
msg0 msg[0-9]
msg1
msg2
prog prog
right right
shift shift
rotated_counterclockwise.txt
rotated_clockwise.txt
no_leading_space.txt
2018/yang/README.md
+29 -30
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@@ -39,15 +39,14 @@ this program left and recompiling will reveal other tools including a right rota
and a shift program. and a shift program.
Strange things happen when the world is upside down! It is entirely possible Strange things happen when the world is upside down! It is entirely possible
that this is remark is completely misleading. that this remark is completely misleading.
What exactly does the shift program do? What exactly does the shift program do?
Like a great sliding puzzle (hint) this entry has 6 more programs that will Like a great sliding puzzle (hint) this entry has six more programs that will
reveal messages and one more tool that can be used to reveal the final reveal messages and one more tool that can be used to reveal the final message
message hidden in the original source. All of these can be created using hidden in the original source. All of these can be created using combinations
combinations of ./left, ./right and ./shift and the additionally generated of `./left`, `./right` and `./shift` and the additionally generated programs.
programs.
The final message can be revealed using The final message can be revealed using
@@ -55,12 +54,12 @@ The final message can be revealed using
./msg9 < prog.c ./msg9 < prog.c
``` ```
But what combinations will generate ./msg3, ./msg4, ./msg5, ./msg6, ./msg7, But what combinations will generate `./msg3`, `./msg4`, `./msg5`, `./msg6`,
./msg8 and finally ./msg9? `./msg7`, `./msg8` and finally `./msg9`?
## Author's comments: ## Author's comments:
### Tools usage ### Tools' usage:
Nuko is a text rotator: given some text in stdin, Nuko will write the Nuko is a text rotator: given some text in stdin, Nuko will write the
same text to stdout, but rotated 90 degrees counterclockwise. same text to stdout, but rotated 90 degrees counterclockwise.
@@ -108,7 +107,7 @@ Where this might be useful, besides ruining the formatting of certain
files, is that it completes the set of tools needed to solve the files, is that it completes the set of tools needed to solve the
puzzle that is embedded in prog.c puzzle that is embedded in prog.c
### Puzzle box ### Puzzle box:
Notice how the edges of prog.c contain two notches. By rotating Notice how the edges of prog.c contain two notches. By rotating
prog.c and removing leading space, the code would be shifted one space prog.c and removing leading space, the code would be shifted one space
@@ -135,20 +134,20 @@ in prog.c, all you need is a C compiler.
### Features ### Features
- Code compiles when rotated 4 ways. This required a bit of - Code compiles when rotated 4 ways. This required a bit of patience to
patience to achieve. Code still compiles even with one column of achieve. Code still compiles even with one column of text shifted. This
text shifted. This required even more patience. required even more patience.
- All rotated and shifted variants compiles without warnings. This - All rotated and shifted variants compiles without warnings. This involves
involves various tweaks to satisfy cases where compiler is overly various tweaks to satisfy cases where compiler is overly protective, including
protective, including but not limited to the "1125" at line 4 as but not limited to the "1125" at line 4 as opposed to "1025", to satisfy
opposed to "1025", to satisfy -Waggresive-loop-optimizations. `-Waggresive-loop-optimizations`.
- CRC32 of the code is embedded in the code itself. - CRC32 of the code is embedded in the code itself.
- Process for writing prog.c is available in spoiler.html - Process for writing prog.c is available in spoiler.html
### Compatibility ### Compatibility:
Nuko and the rotated tools accepts only ASCII files where each Nuko and the rotated tools accepts only ASCII files where each
character maps to exactly one byte. Also, end-of-line sequence is character maps to exactly one byte. Also, end-of-line sequence is
@@ -158,18 +157,18 @@ will look weird after rotation, for example.
Nuko has been verified to work with these compiler / OS combinations: Nuko has been verified to work with these compiler / OS combinations:
- gcc 4.8.4 on Linux - gcc 4.8.4 on Linux
- gcc 4.9.2 on Linux - gcc 4.9.2 on Linux
- gcc 6.1.0 on JS/Linux - gcc 6.1.0 on JS/Linux
- gcc 6.3.0 on Linux - gcc 6.3.0 on Linux
- gcc 6.4.0 on Cygwin - gcc 6.4.0 on Cygwin
- clang 3.5.0 on Linux - clang 3.5.0 on Linux
- clang 3.8.1 on Linux - clang 3.8.1 on Linux
- clang 5.0.1 on Cygwin - clang 5.0.1 on Cygwin
- tcc 0.9.25 on JS/Linux - tcc 0.9.25 on JS/Linux
Nuko compiles without warnings with all compilers above, even with Nuko compiles without warnings with all compilers above, even with
"-Wall -Wextra -pedantic" for gcc and clang. `-Wall -Wextra -pedantic` for gcc and clang.
## Copyright and CC BY-SA 4.0 License: ## Copyright and CC BY-SA 4.0 License: