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Merge pull request #1671 from xexyl/ferguson22020-alt

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Add alt code to 2020/ferguson2
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Landon Curt Noll authored and GitHub committed 2023-12-09 18:30:52 -08:00
2 parents 2c49086e84 4d0b3a25fc
commit 281417a589
5 files changed
+158 -17
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2020/ferguson2/.gitignore
+1
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@@ -8,5 +8,6 @@ indent
indent.c
indent.o
prog
prog.alt
prog.orig
recode
2020/ferguson2/Makefile
+7 -2
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@@ -115,8 +115,8 @@ DATA= chocolate-cake.md enigma.1 input.txt obfuscation.key \
try.this.txt
TARGET= ${PROG} recode
#
ALT_OBJ=
ALT_TARGET=
ALT_OBJ= ${PROG}.alt.o
ALT_TARGET= ${PROG}.alt
#################
@@ -142,6 +142,11 @@ recode: recode.c
alt: data ${ALT_TARGET}
@${TRUE}
# Variable to control how long to sleep for alt code
#
SLEEP= 400000
${PROG}.alt: ${PROG}.alt.c
${CC} ${CFLAGS} -Dh=${SLEEP} $< -o $@ ${LDFLAGS}
# data files
#
data: ${DATA}
2020/ferguson2/README.md
+48
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@@ -4,6 +4,10 @@
make
```
The author provided alternate code that prints the output one character at a
time to make it a bit more like the real thing in that it isn't dumped out all
at once. See [Alternate code](#alternate-code) below.
## To use:
@@ -87,6 +91,50 @@ echo | ./recode -v
do?
## Alternate code:
This version, [prog.alt.c](prog.alt.c), writes a character at a time, sleeping
after each character, so that one can read it more easily (for longer output)
and to make it a bit more like the real thing.
### Alternate build:
```sh
make alt
```
The default time to sleep is 400000 microseconds but you can change this by
doing:
```sh
make clobber SLEEP=600000 alt
```
to change it to 600000 microseconds. It guards against negative numbers.
### Alternate use:
Use `prog.alt` as you would `prog` above.
### Alternate try:
```sh
# encipher input.txt with default settings:
cat input.txt | ./prog.alt
# decipher enciphered input.txt with default settings:
cat input.txt | ./prog| ./prog.alt
```
Notice how only the last part should use the `prog.alt`. Why? Try it and find
out! Can you figure out why this works this way?
## Judges' remarks:
This code is an [enigma](https://youtu.be/ybkkiGtJmkM). Try to decode it!
2020/ferguson2/prog.alt.c
+61
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@@ -0,0 +1,61 @@
%:include <stdio.h>
%:include <ctype.h>
%:include <string.h>
%:include <stdlib.h>
%:include <unistd.h>
%:define J(x) do(*x)=getchar(); while((*x)=='\n')
%:define A(y) *(&Y<:7:><:1:>+(y))
%:define D strchr(
%:define q(s,x) D(s),(x))-(s)
%:define n isalpha
%:define V(k) E = q(Y<:8:>,(k))
%:define K fprintf(stderr,
%:define l(c) (c)=toupper((c))
%:define W(a,b) (a)<:(q((a),(b)) + 1) % 26:>
%:define O(a) k = Y<:8:><:(E - (a) + 26)%26:>
%:define d(a,b) v=(a)<:(E+(b))%26:>
char*M,*R<:3:>,Y<:20:><:27:>=<% "EKMFLGDQVZNTOWYHXUSPAIBRCJ",
"AJDKSIRUXBLHWTMCQGZNPYFVOE" , "BDFHJLCPRTXVZNYEIWGAKMUSQO",
"ESOVPZJAYQUIRHXLNFTGKDCMWB" , "VZBRGITYUPSDNHLXAWMJQOFECK",
"YRUHQSLDPXNGOKMIEBFZCWVJAT" , "FVPJIAOYEDRZXWGCTKUQSBNMHL",
"ABBBCCQEVJZ","ABCDEFGHIJKLMNOPQRSTUVWXYZ", "Mjqq", "Lcxvago"
,"Huwfnbgt","Hdoqhmket fbvy","Mcromlhxo"} ,*S,*r; int *z=(int
<:13:>){ 0} ,*e,*g,*P; size_t L; char Z(char x){ for(*g=0; *g
<10;++*g) {r<:-2:>=Y<:14:><:*(e+1):>; r<:-3:>=Y<:15:><:1<:e:>
:>; if(r<:-3:> && r<:-2:> == r<:-1:>)return r<:-3:>; if (r<:-
2:>&&r<:-3:>==r<:-1:>)return r<:-2:>; }return x; } void w (
char *s, int k, int v) { for(e<:2:> = 0; s<:*P:>; ++e<:2:>){
v = s<:e<:2:>:>; if(v > 64 && v < 91) s<:e<:2:>:> = (((v - 65
+k) % 26) + 65); } } void Q(void) { for(*g = 0; *g < 3; ++*g)
{ *Y<:16+e<:1:>:>=S<:e<:e<:1:>-3:>:>;R<:e<:1:>:>=Y<:e<:-3+e<:
1:>:>:>; w(R[*g],*(e+e<:1:>-6)=q(Y<:8:>,*Y<:7:>),*g); } }void
m(char*x){ char*p=x,a=A(0),b=A(2),c=A(4); int f,E; for( ; *p;
++p) { int u = islower(*p); if(n(l(*p))){char k=*p, v; f = 0;
c == *Y<:18:> && (f = 1) ; c=W(Y<:8:>,c); if (f) {f = 0; b ==
*Y<:17:> && (f = 1); b = W(Y<:8:>,b); f &&(f = 0 && (a= W(Y<:
8:>,a))); }else if(b==*Y<:17:>){ b = W(Y<:8:>,b); a= W(Y<:8:>
,a); } k = Z(r<:-1:> =k); e<:-6:> = q (Y<:8:>,a); e<:-5:> = q
(Y<:8:>,b); e<:-4:>=q( Y<:8:>,c); V(k); d(R<:2:>,e<:-4:>); V(
v); O(e<:-4:>); V(k); d(R<:1:>,e<:-5:>); V(v); O(e<:-5:>); V(
k); d(*R,e<:-6:>); V(v) ; O(e<:-6:>);(Y<:e<:-10:>+ 5:><:k-'A'
:>)&&(k=Y<:e<:-10:>+5:><:k-'A':>); V(k); d(Y<:8:>,e<:-6:>); E
=q(*R,v); O(e<:-6:>); V(k); d(Y<:8:>,e<:-5:>); E= q (R<:1:>,v
); O(e<:-5:>); V(k); d(Y <:8:>,e<:-4:>); E = q(R<:2:>,v); O(e
<:-4:>); k = Z(r<:-1:>=k); *p = u? tolower(k):k; } } } void E
(char*x, int s, int i){ if (n(l(s))) x<:i:>=s; } int p(char x
) {return D 14<:Y:>,x)||D Y<:15:>,x); }int main(int i, char**
v) { int j; e = z + 10; S = Y<:7:> + 6; r = S + 10 ; g = e +1
; P=g+1; for (j=-3; j < 0; ++j) e<:j:> = j+3; Q(); for (j +=9
; j < 14; ++j) m(Y<:j:>); if (!(v<:1:> && *v<:1:>=='-')) goto
k; for (i = 0; i < 3; ++i) { K"%s %d: ",Y<:9:>, i+1); J(&j) ;
j = j - '0'; e<:i-3:>=(j <1 ? 1 : (j>5?5:j))-1; K"%s %d: ",Y
<:10:>,i+1); J(&j); E(Y<:7:>, j, i+i%3); K"%s %d: ",Y<:11:>,i
+1); J(&j); E(Y<:7:>, j,i+i+1); }K"%s: ",Y<:13:>); J(&j); e<:
-10:> = (j < 1 ? 1:(j>1?2:j))-1; for (i = 0; i<10; ++i) { int
a, b; K"%s %d: " , Y<:12:>,i+1); J(&a); J (&b);if (n(l(a))&&
n(l(b))&&a!=b&&!p(b)&&!p(a)) { Y<:14:><:i:> = a; 15<:Y:><:i:>
= b; } %>k: Q(); if(getdelim(&M, &L, EOF, stdin) > 0) <%m(M);
for(int i=0;i[M];putchar(i[M]),fflush(stdout),usleep(0<h?h:4\
00000), ++i); free (M) ;}%>
thanks-for-help.md
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@@ -3147,12 +3147,13 @@ Curiously, although clang requires the types of args to be strictly correct,
some versions do allow only one arg. This was done at first because it's not
used but Cody discovered that later versions of clang have an additional defect
where it does not allow only one arg so the second arg to `main()` was added
back. This was an unfortunate problem for the alt code as he has been using Z
for alt code `usleep()` (for sleep) but
in this case unfortunately the original entry used `Z` in `main()` (though
unused) so to make it more like the original Cody renamed the macro `Z` for
`usleep()` to `S` instead which can stand for sleep and also it is kind of like
a backwards `Z`. That way `Z` could be in `main()`.
back.
This was an unfortunate problem for the alt code as he has been using Z for alt
code `usleep()` (for sleep) but in this case unfortunately the original entry
used `Z` in `main()` (though unused) so to make it more like the original Cody
renamed the macro `Z` for `usleep()` to `S` instead which can stand for sleep
and also it is kind of like a backwards `Z`. That way `Z` could be in `main()`.
Cody also made sure that the Makefile links in `libm` as not all systems do this
by default.
@@ -3795,20 +3796,42 @@ output.
# <a name="2015"></a>2015
## <a name="2015_dogon"></a>[2015/endoh3](/2015/dogon/prog.c) ([README.md](/2015/dogon/README.md]))
[Cody](#cody) improved the Makefile so that one can easily change the dimensions
at compilation time via `make(1)`.
Cody also added alt code that is based on the author's remarks, suggesting that
one change the value of `q` to a different number, in order to see a bug that
they avoided.
## <a name="2015_duble"></a>[2015/endoh3](/2015/duble/prog.c) ([README.md](/2015/duble/README.md]))
[Cody](#cody) added the [try.sh](/2015/duble/try.sh) script.
## <a name="2015_endoh2"></a>[2015/endoh2](/2015/endoh2/prog.c) ([README.md](/2015/endoh2/README.md]))
[Cody](#cody) added the [try.sh](2015/endoh2/try.sh) script.
## <a name="2015_endoh3"></a>[2015/endoh3](/2015/endoh3/prog.c) ([README.md](/2015/endoh3/README.md]))
[Cody](#cody) fixed this to compile with Linux which was having a problem with duplicate
symbols of `main()`. The fix is through the compiler option `-fcommon` which
will let it compile like it does with macOS.
Cody also made it easier to enjoy the theme of [Back to the
Cody also added the [try.sh](/2015/endoh3/try.sh) script which makes use of the
make rule he added (to enjoy the theme of the entry, [Back to the
Future](https://en.wikipedia.org/wiki/Back_to_the_Future) using this entry by
simply typing `make back_to` or `make mullender`.
simply typing `make back_to` or `make mullender`) and then runs the famous
[1984/mullender.c](/1984/mullender/mullender.c).
## <a name="2015_endoh4"></a>[2015/endoh4](/2015/endoh4/prog.c) ([README.md](/2015/endoh4/README.md]))
[Cody](#cody) added the [try.sh](/2015/endoh4/try.sh) script.
## <a name="2015_hou"></a>[2015/hou](/2015/hou/prog.c) ([README.md](/2015/hou/README.md))
@@ -3816,19 +3839,22 @@ simply typing `make back_to` or `make mullender`.
[Cody](#cody) added explicit linking of libm (`-lm`) for systems that do not do this
(Linux doesn't seem to but macOS does).
Cody also added the [try.sh](/2015/hou/try.sh) script and the large file `large`
which the `try.sh` script uses.
Cody also added the RFC 1321 text file, [rfc1321.txt](/2015/hou/rfc1321.txt) to
the directory, to make it so one need not download it, and which the README.md
file now links to.
## <a name="2015_howe"></a>[2015/howe](/2015/howe/prog.c) ([README.md](/2015/howe/README.md))
[Cody](#cody) added the [try.sh](2015/howe/try.sh) script, downloaded the War
and Peace text file, fixed the [avgtime.sh](2015/howe/avgtime.sh) script (it
[Cody](#cody) added the [try.sh](/2015/howe/try.sh) script, downloaded the War
and Peace text file, fixed the [avgtime.sh](/2015/howe/avgtime.sh) script (it
resulted in standard input errors in piping to `bc(1)`) and added the
[cc.1](2015/howe/cc.1) man page as not all systems have it (in fact it's
[cc.1](/2015/howe/cc.1) man page as not all systems have it (in fact it's
`gcc(1)` from Rocky Linux).
Cody also added the RFC 1321 text file, [rfc1321.txt](2015/hou/rfc1321.txt) to
the directory, to make it so one need not download it, and which the README.md
file now links to.
## <a name="2015_mills1"></a>[2015/mills1](/2015/mills1/prog.c) ([README.md](/2015/mills1/README.md))