Merge pull request #810 from xexyl/1990-theorem-bugs

Change infinite loop bug status in 1990/theorem

1988/litmaath/.gitignore

@@ -1 +1,2 @@
 litmaath
+litmaath.alt

1988/litmaath/Makefile

@@ -111,8 +111,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################

1988/litmaath/README.md

@@ -1,18 +1,42 @@
 # Best small program
 
 Maarten Litmaath  
-Free University (VU) Amsterdam  
-Department of computer science  
-Uilenstede 72  
-1183 AK Amstelveen  
 The Netherlands  
 
+## To build:
+
+```sh
+make
+```
+
+## To run:
+
+```sh
+./litmaath some text
+```
+
+There is an alternate version provided. See the Alternate code section below.
+
 ## Try:
 
 ```sh
 ./litmaath eschew obfuscation
 ```
 
+### Alternate code:
+
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) added the
+[litmaath.alt.c](litmaath.alt.c) which we described in our remarks below. To
+use:
+
+```sh
+make alt
+```
+
+Use `litmaath.alt` as you would `litmaath` above.
+
+Thank you Cody!
+
 
 ## Judges' remarks:
 

1988/litmaath/litmaath.alt.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+main(argc, argv)
+int	argc;
+char	**argv;
+{
+	while (*argv != argv[1] && (*argv = argv[1]) && (argc = 0) || (*++argv
+		&& (**argv && ((++argc)[*argv] && (**argv <= argc[*argv] ||
+		(**argv += argc[*argv] -= **argv = argc[*argv] - **argv)) &&
+		--argv || putchar(**argv) && ++*argv--) || putchar(10))))
+    fprintf(stderr,
+     "argv=%lo *argv=%lo **argv=%c argv[1]=%lo *argv[1]=%c argc=%d\n",
+     (long) argv, (long) *argv, *argv && **argv ? **argv : '@',
+     (long) argv[1], argv[1] && *argv[1] ? *argv[1] : '@', argc);
+
+		;
+}

1990/theorem/.gitignore

@@ -1,3 +1,4 @@
+theorem
 fibonacci
 fibonacci.c
 mariano

1990/theorem/README.md

@@ -29,7 +29,7 @@ about `gets()` at linking or runtime. Thank you Cody for your assistance!
 
 [Yusuke Endoh](/winners.html#Yusuke_Endoh) pointed out that `atof` nowadays
 needs `#include <stdlib.h>` which was used in order to get this to work
-initially. Thank you Yusuke!
+initially (prior to this the output was incomplete). Thank you Yusuke!
 
 
 ## To run:
@@ -54,20 +54,29 @@ y1 - initial value  (y(x1) == y1)
 ./theorem y 0 1 0.1 1
 ```
 
-### Known bug with `fibonacci.c` and `theorem_bkp.c`:
+### INABIAF - it's not a bug it's a feature! :-)
 
-If the two args added up equals 0 the program will enter an infinite loop,
-printing 0 over and over again. Cody fixed another condition where this happens
-but this has not been fixed. See [bugs.md](/bugs.md) for more details.
+If the two args passed to `fibonacci` and `theorem_bkp` equals 0 it will
+print 0 over and over again in an infinite loop. In this case it should not be
+fixed (another condition where this occurred was fixed as it affected usability
+of the program).
+
+BTW: why can't the fix:
+
+```c
+if (a[1]==NULL||a[2]==NULL||a[3]==NULL||a[4]==NULL||a[5]==NULL) return 1;
+```
+
+be changed to just test the value of `A` when `a` is argv and `A` is argc?
 
 ## Judges' remarks:
 
 The program's source implements four functions, all from the
 same source file!
 
-When you compile theorem.c as is and run with 5 args, it numerically
-solves the equation `y'=f(x,y)`, with a step size of `h`, over the interval 
-`x=[x1,x2]`, with the initial condition of `y(x1)=y1`.
+When you compile theorem.c as is and run with 5 args, it numerically solves the
+equation `y'=f(x,y)`, with a step size of `h` (see above usage), over the
+interval `x=[x1,x2]`, with the initial condition of `y(x1)=y1`.
 
 The 'expression' `f(x,y)` is any function of `x` and `y` with the
 operators:

2001/anonymous/README.md

@@ -19,21 +19,21 @@ make
 supplementary program and the program itself (both of which segfaulted and once
 that was fixed only the binary was modified; it was not run but according to the
 author's remarks it should be executed). He managed to do this with linux
-but it will not work with macOS (see [bugs.md](/bugs.md) for why this is); this
-is not a bug but a feature inherent in what it does.
+but it will not work with macOS (see [bugs.md](/bugs.md) for why this is); _this
+is not a bug, it's a feature_ inherent in what it does!
 
-Although it took a fair bit of debugging it turns out all that had to change
-was:
+The following had to be done in order to get this to work:
 
 - `#include <sys/mman.h>` for `mmap()` and `munmap()`.
 - have `main()` call another function which is no longer a recursive function;
 this prevented `main()` from entering an infinite recursive loop.
 
 Without either of these it would crash and prevent modification of the 32-bit
-[ELF](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) (not elf :-)
-) binary. But again see [bugs.md](/bugs.md) here. The following change was also
-made to be more portable, in case the constants `PROT_READ` and/or `PROT_WRITE`
-are not standardised:
+[ELF](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) (not elf :-) )
+binary. But again see [bugs.md](/bugs.md) here.
+
+The following change was also made to be more portable, in case the constants
+`PROT_READ` and/or `PROT_WRITE` are not standardised:
 
 Change `3` in the call to `mmap()` to be `PROT_READ|PROT_WRITE`: just in case
 `PROT_READ|PROT_WRITE` does not equal 3 (though it seems to be equal in both
@@ -42,12 +42,13 @@ macOS and linux).
 There was one other thing that had to be done though. Since the program used to
 recursively call (infinite recursion, seemingly) `main()` and since that cannot
 be done what had to be done instead is after the new function (`pain()` since it
-was a pain to fix :-) ) returns to first call `munmap()` and `close()` (else
-one would get text file busy error) and then the program can call `execv()` again like the
-function `pain()` (was in `main()`) did but with a slight change. See commit
-`2159caec4677e0f25ad704a74e04c8196fd6c343` for details. Notice that
-the location of the calls to `munmap()` and `close()` followed by `execv()` do
-matter!
+was a pain to fix :-) ) returns to first call `munmap()` and `close()` (else one
+would get text file busy error) and then the program can call `execv()` again
+like the function `pain()` (was in `main()`) did but with a slight change. See
+commit `2159caec4677e0f25ad704a74e04c8196fd6c343` for more details.
+
+Notice that the location of the calls to `munmap()` and `close()` followed by
+`execv()` _does matter_!
 
 NOTE: there might be educational value to see the progress of this fix; if you
 wish to see, try:

2001/kev/.gitignore

@@ -1 +1,2 @@
 kev
+kev.alt

2001/kev/Makefile

@@ -59,7 +59,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE= -DPORT=5455 -DSPEED=50 -Dl_="socket(il.sin_family=AF_INET,SOCK_STREAM,0)"
+CDEFINE= -DPORT=5455 -DSPEED=100 -Dl_="socket(il.sin_family=AF_INET,SOCK_STREAM,0)"
 
 # Include files that are needed to compile
 #
@@ -115,8 +115,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################
@@ -138,6 +138,9 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} $< -o $@ ${LIBS}
+
 # data files
 #
 data: ${DATA}

2001/kev/README.md

@@ -1,11 +1,8 @@
 # Best Curses Game
 
-Kevin Pulo
-School of Information Technologies
-Madsen Building F09
-University of Sydney, NSW, 2006
-Australia
-<http://www.kev.pulo.com.au/>
+Kevin Pulo<br>
+Australia<br>
+<http://www.kev.pulo.com.au/><br>
 Mastodon: <https://fosstodon.org/@devkev>
 
 ## To build:
@@ -17,15 +14,49 @@ make
 ## To run:
 
 ```sh
-./kev hostname
+./kev # in one terminal
+
+./kev hostname # in another terminal
 ```
 
+NOTE: each player's paddle is at the bottom and the opponent at the top.
+
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) slowed down the ball
+just a tad as it went too fast for the speed at which the paddles move even when
+holding down the movement keys. If you need to change the speed you can
+reconfigure it like (say for over a network and not the same host):
+
+```sh
+make clobber SPEED=50 all # default value which is very fast
+```
+
+There is an alternate version which lets you use the arrow keys to control your
+paddle. See below Alternate code.
+
 ## Try:
 
 ```sh
+./kev 
 ./kev localhost
 ```
 
+### Alternate code:
+
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) provided an alternate
+version which lets you use the arrow keys on your keyboard instead of the more
+awkward ',' and '.'. To use:
+
+```sh
+make alt
+```
+
+Use `kev.alt` as you would `kev`.
+
+What happens if you use both, one in one terminal and the other in another
+terminal?
+
+Thank you Cody!
+
 ## Judges' remarks:
 
 Continuing with this year's "retro game" theme, this is another old game;
@@ -45,7 +76,7 @@ box.
 
 * TCP sockets
 * curses
-* usleep
+* `usleep()`
 
 ### DESCRIPTION
 
@@ -117,18 +148,17 @@ terminal size).
 
 ### BUILDING
 
-Just run `make`to use the Makefile as above.  The `SPEED` variable in the Makefile
-controls the speed of the game (defaults to `50`).  This speed is
-the delay between frames in milliseconds.  Thus a value of 0 will
-make the game go as fast as your network can handle, and values
-less than 50 are useful for larger terminals or more exciting
-games.  The program needs bandwidth equal to 1/s bytes per second
-(where `s` is the speed value).  Any latency on the network will
-be added to `s` - so you should probably subtract any latency from
-the value of `s` you want to have.  Given that `loopback` and fast
-Ethernet LANs are both much less than 1ms of latency, you should
-only need to worry about this if you plan on playing over a slower
-link like a cable modem, DSL, or (God-forbid) dial-up.
+Just run `make`to use the Makefile as above.  The `SPEED` variable in the
+Makefile controls the speed of the game (defaults to `50`).  This speed is the
+delay between frames in milliseconds.  Thus a value of 0 will make the game go
+as fast as your network can handle, and values less than 50 are useful for
+larger terminals or more exciting games.  The program needs bandwidth equal to
+1/s bytes per second (where `s` is the speed value).  Any latency on the network
+will be added to `s` - so you should probably subtract any latency from the
+value of `s` you want to have.  Given that `loopback` and fast Ethernet LANs are
+both much less than 1ms of latency, you should only need to worry about this if
+you plan on playing over a slower link like a cable modem, DSL, or (God-forbid)
+dial-up.
 
 The TCP port to use for network communications is specified by the
 `PORT` variable in the Makefile.  If the default of `5455` is

2001/kev/kev.alt.c

@@ -0,0 +1,122 @@
+#include <unistd.h>
+#include <curses.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <sys/time.h>
+
+#define o0(M,W) mvprintw(W,M?M-1:M,"%s%s ",M?" ":"",_)
+#define O0(M,W) M##M=(M+=W##M)-W##M
+#define l1(M,W) M.tv_##W##sec
+#define L1(m,M,l,L,o,O) for(L=l;L--;)((char*)(m))[o]=((char*)(M))[O]
+#define I1 lL,(struct sockaddr*)&il
+#define i1 COLS
+#define j LINES
+#define L_ ((j%2)?j:j-1)
+
+fd_set I;struct socka\
+ddr_in il;struct host\
+ent*LI; struct timeval
+IL,l;char L[9],_[1<<9]
+   ;void ___(int __
+   ){_[__--]=+0;if(
+   ++__)___(--__);_
+   [__]='=';}double
+   o,oo=+0,Oo=+0.2;
+   long O,OO=0,oO=1
+   ,ii,iI,Ii,Ll,lL,
+   II=sizeof(il),Il
+   ,ll,LL=0,i=0,li,
+   lI;int main(int\
+   iL,char *Li[]){\
+   initscr();keypad
+   (stdscr,1);cbreak
+   ();noecho();nonl
+   ();___(lI=i1/4);
+   _[0]='[';_[lI-1]
+   =']';L1(&il,&_,\
+   II,O,+O,+lI);il.
+   sin_port=htons((
+   unsigned long)(\
+   PORT&0xffff));lL
+   =l_;if(iL=!--iL)
+   {il. sin_addr .\
+   s_addr=0;bind(I1
+   ,II);listen(lL,5
+   );lL=accept(I1,&
+   II);}else{oO-=2;
+   LI=gethostbyname
+   (Li[1]);L1(&(il.
+   sin_addr),(*LI).
+   h_addr_list[0],\
+   LI->h_length,iI,
+   iI,iI);(*(&il)).
+   sin_family=(&(*\
+   LI))->h_addrtype
+   ;connect(I1,II);
+   }ii=Ii=(o=i1*0.5
+   )-lI/2;iI=L_-1;O
+   =li=L_*0.5;while
+   (_){mvaddch(+OO,
+   oo,' ');o0(ii,iI
+   );o0(Ii,Il-=Il);
+   mvprintw(li-1,Il
+   ,"%d\n\n%d",i,LL
+   );mvhline(li,+0,
+   '-',i1);mvaddch(
+   O,o,'*');move(li
+   ,Il);refresh();\
+   timeout(+SPEED);
+   gettimeofday(&IL
+   ,+0);Ll=getch();
+   timeout(0);while
+   (getch()!=ERR);\
+   if(Ll=='q'&&iL)\
+   write(lL,_+1,1);
+   if(ii>(ll=0)&&Ll
+   ==KEY_LEFT){write(lL,
+   _,-(--Il));}else
+   if(Ll==KEY_RIGHT&&ii+\
+   lI<i1){write(lL,
+   _+lI,++Il);}else
+   if(iL||!Il)write
+   (lL,_+lI-1,4-3);
+   gettimeofday(&l,
+   0);II=((II=l1(IL
+   ,)+(l1(l,u)-=l1(
+   IL,u))-l1(l,)+(\
+   l1(l,)-=l1(IL,))
+   )<0)?1+II-l1(l,)
+   +1e6+(--l1(l,)):
+   II;usleep((II+=\
+   l1(l,)*1e6-SPEED
+   *1e3)<0?-II:+0);
+   if(Ll=='q'&&!iL)
+   break;FD_ZERO(&I
+   );FD_SET(lL,&I);
+   memset(&*&IL,ll,
+   sizeof(l));if((\
+   Ll=select(lL+1,&
+   I,0,0,&IL)));{if
+   (read(lL,&L,ll+1
+   )){if(!*L){ll++;
+   }else if(*L==ll[
+   _]){ll--; }else\
+   if(*(&(*L))==1[_
+   ]){break;}}else{
+   break;}}O0(o,O);
+   O0(O,o);if(o<0){
+   o*=-1;Oo*=-1;}if
+   (o>i1){o=i1+i1-o
+   ;Oo*=-1;}if(o>=(
+   Ii+=ll)&&O<1&&oO
+   <0&&o<Ii+lI){O=2
+   ;oO=~--oO;Oo+=ll
+   *4e-1;}if(O<0){O
+   =iI;LL++;}if(o>=
+   (ii+=Il)&&O>iI-1
+&&oO>0&&o<ii+lI){O=iI-
+2;oO=~--oO;Oo+=Il*4e-1
+;}if(+O>+iI){O-=O;i++;
+}}endwin();return(0);}
+

2005/giljade/Makefile

@@ -134,6 +134,8 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
+	@echo "NOTE: this version cannot successfully run the self-test. Use make alt"
+	@echo "for a version which will work. See README.md for why it is this way."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable

2005/giljade/README.md

@@ -10,33 +10,52 @@ Israel
 make
 ```
 
+NOTE: if you do not have access to a compiler that lets you have alternative arg
+types to `main()` the self-test feature will fail. If your compiler does not
+have this defect you can use the Alternate code described below. The reason to
+have it as the alternate version is that there is more to the entry that can
+still be enjoyed with compilers with the `main()` args defect including the
+primary purpose of the entry, a puzzle.
+
+Hopefully this will be resolved in time where there is no need for an alternate
+version but it's a complicated one. See also the [bugs.md](/bugs.md) file for
+more information.
+
 ## To run:
 
 ```sh
 ./giljade
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this for modern
-systems. The problem that was showing up is that with either optimising or
-anything but 32-bit was used it would not work. The optimising cannot be used
-still but it now works with both 32-bit and 64-bit. The problem was the size of
-`int` and `long` being different now. Instead of `long *E` it is now `int *E`.
-This solves the problem for both 32-bit and 64-bit as long as optimising is
-disabled. Tested under linux (32-bit, 64-bit) and macOS (arm64). Thank you Cody
-for your assistance!
+After Landon fixed the entry to compile with clang (but see above and below)
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) noticed this does not
+work at all in modern systems. He fixed this to work but he notes that the fix
+to let clang compile it breaks the self-test feature.
 
-NOTE: the self-test feature no longer works due to the fix for clang (which
-requires the first arg of `main()` to be an `int` and the second arg to be `char
-**`). Believe it having more than two spaces in the code, except where the
-original code has them, appears to be part of the problem but it's not the full
-story. If you have a compiler that doesn't have this deficiency (e.g.  gcc) you
-can use the alternate code described below.
+The problem that was showing up is that with either optimising or if anything
+but 32-bit (as in `-m32`) was used it would not work (at least in 64-bit
+systems?). The optimising cannot be used still but it now works with both 32-bit
+and 64-bit. The solution has to do with the size difference between `int` and
+`long` so that the `long*E` is now `int*E`. This solves a specific problem for
+linux (32-bit, 64-bit) and macOS (arm64).
+
+But as noted there is another problem with clang: the self-test feature only
+completely works with the original version ([giljade.alt.c](giljade.alt.c)), not
+the one that will compile with clang ([giljade.c](giljade.c)). The alternate
+version, which will not compile with clang, is the only one that passes the
+self-tests. If your compiler does not have the defect that clang has about arg
+types to `main()` see the Alternate code section below at least for the
+self-test feature.
+
+Thank you Cody for your assistance!
 
 ### INABIAF - it's not a bug it's a feature! :-)
 
 If the program source file is not lying in the same directory this program will
 very likely crash or do something strange.
 
+This entry requires that both `sed` and `cc` are in the path.
+
 ## Try:
 
 ```sh
@@ -52,18 +71,22 @@ Press ^F (control F) repeatedly.
 
 ### Alternate code:
 
-Thanks to the fix for `clang` the self-test feature (of the output, see the
-author's remarks) does not work. If however you have gcc which does not have the
-defect that clang has with requirements in `main()`s args you can still use it
-via the alternate code. To compile:
-
+This version will work only with compilers that let you have alternate types to
+the args of `main()` and will also successfully run its self-test (the other
+version only runs some of them successfully). To use:
 
 ```sh
 make alt
 ```
 
-Use `giljade.alt` as you would `giljade`.
+Use `giljade.alt` as you would `giljade` above.
 
+#### Try:
+
+```sh
+./giljade.alt > out
+./giljade.alt out
+```
 
 ## Judges' remarks:
 

2005/giljade/giljade.alt.c

@@ -12,7 +12,7 @@
 ),l)u=u>>5-m &u;s=u&E[3-l];I(t(m),3-l) s=(u)a&*E;I\
 (t(m),(0));; /*echo/Line/%d;sed/-n/-e/ %d,%dp/%s>*/
 /*c.c;cc/c.c /-c*/;;char*A=0,*_,*R,*Q, D[9999],*r,l
-[9999],T=42, M,V=32;long*E,k[9999],B[1 <<+21],*N=B+
+[9999],T=42, M,V=32;int *E,k[9999],B[1 <<+21],*N=B+
 1234567,q=0, h=3,j=2,O,b,f,u,s,c,a,t,e ,d;C(){F(h=N
 [3];(B[h]&&+ memcmp(N,B+B[h],16));h=B[ h]+4);B[h]||
 (B[h]=N-B,N= N+6);}main(char*U,int*w[] ){;;F(_=A=D+

2005/giljade/giljade.c

@@ -10,14 +10,13 @@
 \
 )u=(f&p)i(m) ;s=u&E[3];I(t(m),3)s=(u)a &E[l];I(t(m\
 ),l)u=u>>5-m &u;s=u&E[3-l];I(t(m),3-l) s=(u)a&*E;I\
-(t(m),(0));; /*echo/Line/%d;sed/-n/-e/ %d,%dp/%s>*/
-/*c.c;cc/c.c/-Wno-implicit-function-declaration /-c*/
-;;char*A=0,*_,*R,*Q, D[9999],*r,l
-[9999],T=42, M,V=32;int*E,k[9999],B[1 <<+21],*N=B+
+(t(m),(0));; /*echo/Line/%d;sed/-n/-e/ %d,%dp/%s/|sed*/
+/*-e/'s,intZ,int/ Z,g'>c.c;cc/c.c/-Wno-implicit-function-declaration /-c*/
+;;char*A=0,*_,*R,*Q, D[9999],*r,l[9999],T=42, M,V=32;int *E,k[9999],B[1 <<+21],*N=B+
 1234567,q=0, h=3,j=2,O,b,f,u,s,c,a,t,e ,d;C(){F(h=N
 [3];(B[h]&&+ memcmp(N,B+B[h],16));h=B[ h]+4);B[h]||
-(B[h]=N-B,N= N+6);}int main(int Ua,char **wa){char*U
-=Ua;int**w= wa;;F(_=A=D+6666,A[fread(A,1,3333,fopen
+(B[h]=N-B,N= N+6);}main(int Z,char**Y ){char*U=Z ;
+int**w=Y; ;;F(_=A=D+6666,A[fread(A,1,3333,fopen
 (__FILE__, "r"))]=0;*++ _;h||(*_=V))
 *_-59|_[1]-* _||(h&&(*_=+ 35),h---2||(_[9]=V));;F(_
 =A;*_;_++)10 -*_&&*_-V&&( *_-92)&&(k[q]=isalnum(l[q

2005/jetro/README.md

@@ -8,12 +8,15 @@ Finland
 
 This entry requires SDL to be installed.
 
+See the [faq](/faq.md) for information on how to install it if you haven't
+already.
+
+If you have SDL installed:
+
 ```sh
 make
 ```
 
-See the [faq](/faq.md) for information on how to install it if you haven't
-already.
 
 ## To run:
 

2015/endoh1/README.md

@@ -20,10 +20,6 @@ make
 
 Connect to port http://localhost:10333 with your browser.
 
-The author said he had no recent version of macOS to test to see if this works
-but in 2023 [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) did this
-and reported that it works well. He also said he really loved it! Thank you
-Cody!
 
 ## Try:
 
@@ -41,8 +37,12 @@ find any other tributes?
 
 ## Author's remarks:
 
-What does "Alan Turing" remind you of?  Cryptanalysis of the Enigma?  Turing
-machine?  Turing test?  This program is also based on his work.
+What does "[Alan Turing](https://en.wikipedia.org/wiki/Alan_Turing)" remind you
+of? [Cryptanalysis](https://en.wikipedia.org/wiki/Cryptanalysis) of the [Enigma
+machine](https://en.wikipedia.org/wiki/Enigma_machine)?  [Turing
+machine](https://en.wikipedia.org/wiki/Turing_machine)? [Turing
+test](https://en.wikipedia.org/wiki/Turing_test)? This program is also based on
+his work.
 
 ### Whirlwind tour
 
@@ -58,20 +58,24 @@ cc -O3 -std=c99 \
         -DTIMESTEP=1.0 -DSPEED=2 -DRGB=255:128:192
 ```
 
-Then, run it under `tcpserver` command in
+Then, run it under `tcpserver` command in the
 [ucspi-tcp](http://cr.yp.to/ucspi-tcp.html) package, which was created by
 [Daniel J. Bernstein](/winners.html#Daniel_J._Bernstein), [IOCCC 1991 "Best of
 Show"](../../1991/brnstnd/brnstnd.c) ([README.md](../../1991/brnstnd/README.md)).
 
-    $ tcpserver -v 127.0.0.1 10333 ./prog ioccc.txt
+```sh
+tcpserver -v 127.0.0.1 10333 ./prog ioccc.txt
+```
 
 Finally, open `http://127.0.0.1:10333/` by a modern browser supporting HTML5.
-You can use the mouse cursor to place drops into the Petri dish interactively.
+You can use the mouse cursor to place drops into the [Petri
+dish](https://en.wikipedia.org/wiki/Petri_dish) interactively.
 
 
 ### Description
 
-This is a simulator of *reaction-diffusion systems*.
+This is a simulator of [reaction-diffusion
+systems](https://en.wikipedia.org/wiki/Reaction-diffusion_system).
 
 Reaction-diffusion systems, proposed by Alan Turing in [1], are mathematical
 models in which two chemical substances are transformed into each other (*local

2019/mills/README.md

@@ -41,10 +41,8 @@ Can a machine learn?
 
 Some say so.
 
-But can a machine learn to write like Shakespeare,
-or tweet like [Trump](http://trumptwitterarchive.com)?
-
-Can it write rules and guidelines for the IOCCC?
+But can a machine learn to write like Shakespeare? Can it write rules and
+guidelines for the IOCCC?
 
 You decide. :-)
 

2019/poikola/README.md

@@ -33,6 +33,11 @@ TZ=UTC48 make clobber prog
 ./prog 512 ./prog
 ```
 
+### INABIAF - it's not a bug it's a feature! :-)
+
+This program will not validate input so it might fail or get stuck if invoked
+erroneously.
+
 ## Judges' remarks:
 
 Do you have the time to see what this program does?  Think again, come back and
@@ -69,18 +74,20 @@ clang -O1 -o prog prog.c
 ### Poster:
 
 You can generate an A3 sized poster by `make docs`. This command creates a pdf
-file `poikola.pdf`.
+file `poikola.pdf`. This requires the
+[pdfTeX](https://en.wikipedia.org/wiki/PdfTeX) tool.
 
 ### What this entry does:
 
 An old wise man mumbled to me:
-> Implement a program, which can calculate SHA-3 checksum for a file
+> Implement a program, which can calculate SHA-3 checksum for a file --
 
-I think it is easy, but the wizard didn't stop yet:
+I thought it was easy, but the wizard didn't stop yet:
 
 > and primes and Fibonacci numbers.
 
-Still easy. But the Gandalf the Grey impersonator is not ready:
+Still easy. But the [Gandalf the
+Grey](https://www.glyphweb.com/arda/g/gandalf.html) impersonator was not ready:
 
 > But use only `main()`, and do not use `math.h` nor predefined stuff at all.
 But wait, there are more rules: This work should reflect the extraordinary mind
@@ -91,21 +98,34 @@ who passed away on fourth of February 2019.
 
 ### Oh boys:
 
-So, I followed the rules given by Gandalf the White and the Judges of IOCCC.
+So, I followed the rules given by [Gandalf the
+White](https://www.glyphweb.com/arda/g/gandalf.html) and the [Judges of
+IOCCC](/judges.html).
+
 Output of `iocccsize`, using the [2019 version of
 iocccsize](https://www.ioccc.org/2019/iocccsize.c), is carefully selected.  For
 the sake of clarity, I used single letter variables in the code. I also avoided
-unnecessary use of functions.  Like a tripundra, this program has three levels.
+unnecessary use of functions.  Like a
+[tripundra](https://en.wikipedia.org/wiki/Tripundra), this program has three levels.
 In order to reveal all of them, you have to compile this program on three
 consecutive days.
 
 As this is a contest for obfuscated code, the program does not perform
 unnecessary checks, but either fails or gets stuck if invoked erroneously. The
-program is invoked in this way: ./prog `<integer>` `<file>` in where `<integer>`
-is 224, 256, 384, 512 or even 1024. Yes, I know 1024 is not a supported length
-of output, but as I said, the program does not validate its input in any way.
-These same parameters should be given in calculating a Fibonacci sequence or
-prime numbers. *Please note that maximum file size is one gigabyte..
+program is invoked in this way:
+
+
+```sh
+./prog <integer> <file>
+
+```
+
+where `<integer>` is 224, 256, 384, 512 or even 1024. Yes, I know 1024 is not a
+supported length of output, but as I said, the program does not validate its
+input in any way.  These same parameters should be given in calculating a
+[Fibonacci sequence](https://en.wikipedia.org/wiki/Fibonacci_sequence) or [prime
+numbers](https://en.wikipedia.org/wiki/Prime_number). *Please note that maximum
+file size is one gigabyte*!
 
 ### Obfuscation:
 
@@ -116,67 +136,96 @@ the feeling that I've been here before.
 make your own decisions. Up there, it's all _up yours_.
 
 This code has some jumping too. I used some `goto`s instead of `longjmp()`. Some
-Finnish ski jumping sites are used as labels, however, there is `lahti` instead
-of <tt style="font-family: Monaco, Courier New, monospace;font-size:
-12px;">salpausselk&auml;</tt>.
+Finnish [ski jumping](https://en.wikipedia.org/wiki/Ski_jumping) sites are used
+as labels, however, there is `lahti` instead of <tt style="font-family: Monaco,
+Courier New, monospace;font-size: 12px;">salpausselk&auml;</tt>.
 
 ### SHA-3-512 Compatibility chart ###
 
 Tested against [test vectors](https://www.di-mgt.com.au/sha_testvectors.html).
-Clang-4.0: For optimization levels [0123s], the program compiles and produces correct output for every tested vector using
-c11, c89, c90, c99, gnu11, gnu1x, gnu89, gnu90, gnu99, iso9899:1990, iso9899:199409, iso9899:1999 and
-iso9899:2011 as argument of `-std=`
 
-Gcc-6: For optimization level 0, correct output using
-c11, c99, gnu11, gnu1x, gnu89, gnu90, gnu99, iso9899:1999 and iso9899:2011
+Clang-4.0: For optimization levels [0123s], the program compiles and produces
+correct output for every tested vector using the C standards c11, c89, c90, c99,
+gnu11, gnu1x, gnu89, gnu90, gnu99, iso9899:1990, iso9899:199409, iso9899:1999
+and iso9899:2011 (argument of `-std=`).
+
+GCC-6: For optimization level 0, correct output using the C standards
+c11, c99, gnu11, gnu1x, gnu89, gnu90, gnu99, iso9899:1999 and iso9899:2011.
 
 ### Missing a prime
 
-For obvious reason, the oddest prime is missing from output.
+For obvious reason, the [oddest
+prime](https://mathworld.wolfram.com/OddPrime.html) is missing from output.
 
 ### Observations
 
-Gcc and clang are very fragile compilers. I spent numerous hours trying to achieve exactly the same output from
-different optimization levels and compilers. Small change in code can produce really unexpected results, i.e. the compiler
-can skip a few expressions or statements without obvious reason.
+`gcc` and `clang` are very fragile compilers. I spent numerous hours trying to
+achieve exactly the same output from different optimization levels and
+compilers. Small change in code can produce really unexpected results, i.e. the
+compiler can skip a few expressions or statements without obvious reason.
 
 ### Major spoilers
 
-Please scroll down if you want to see spoilers.
-<div style="margin-bottom:61em;">&nbsp;</div>
-It is commonly believed that [Mike Keith's algorithm](http://www.cadaeic.net/calendar.htm) published in _Journal of
-Recreational Mathematics_, Vol. 22, No. 4, 1990, p. 280, is the shortest way to calculate weekday for given date.
-Keith's algorithm:<br>
-`(d+=m<3?y--:y-2,23*m/9+d+4+y/4-y/100+y/400)%7`<br>
-My algorithm: I noticed that<br>
-`(23*m/9+(m<3?y--:y-2)+d+4+y/4-y/100+y/400)%7`<br>
-is one character shorter. In my solution, `m<3?y--:y-2` is used directly, instead of assign value for `d`.
+It is commonly believed that [Mike Keith's
+algorithm](http://www.cadaeic.net/calendar.htm) published in _Journal of
+Recreational Mathematics_, Vol. 22, No. 4, 1990, p. 280, is the shortest way to
+calculate the day of the week for a given date.
 
-Q is pronounced in Finnish exactly like "kuu", a word for month or the Moon. So, `Q = k` is intended.
+#### Keith's versus my algorithm
 
-Last term of outputted Fibonacci sequence is the last one smaller than 2<sup>64</sup>. It is plain coincidence (but a funny)
-that value of '^' is 94 in ASCII table.
+Kieth's algorithm is `(d+=m<3?y--:y-2,23*m/9+d+4+y/4-y/100+y/400)%7`. I noticed
+that `(23*m/9+(m<3?y--:y-2)+d+4+y/4-y/100+y/400)%7` is one character shorter. In
+my solution, `m<3?y--:y-2` is used directly, instead of assigning a value to
+`d`.
 
-For prime calculations: I recycled code from my high school C-programming course. Originally, I wrote it over 20 years
-ago. My teacher said that it is (too) complicated to use bits stored in arrays, so I did it.
+Q is pronounced in Finnish exactly like "kuu", a word for
+[month](https://en.wikipedia.org/wiki/Month) or the
+[Moon](https://en.wikipedia.org/wiki/Moon). So, `Q = k` is intended.
+
+Last term of outputted [Fibonacci
+sequence](https://en.wikipedia.org/wiki/Fibonacci_sequence) is the last one
+smaller than 2<sup>64</sup>. It is a plain but funny coincidence
+that the value of `^` is 94 in [ASCII](https://en.wikipedia.org/wiki/ASCII).
+
+For [prime calculations](https://en.wikipedia.org/wiki/Prime_number): I recycled
+code from my high school C-programming course. Originally, I wrote it over 20
+years ago. My teacher said that it is (too) complicated to use bits stored in
+arrays, so I did it.
 
 ### Other stuff
 
-Cody: I really like that you enjoyed my previous entry. I hope that you will like this entry too.
-Because I did not want to give too many clues to Judges, I tried to write this entry in a different way
-than Most Stellar, but in this code there is at least one recycled thing from it. By the way,
-answers to questions: 1. 255. 2. Try to compare binary representations of those floats and binary representation
-of the string "25th IOCCC!". 3. I don't know. I used standard trigonometric functions from `math.h` for rotating the Big Dipper
-and later replaced those functions with my own implementations. But there was a bug in my code and the effect was more
-beautiful than intended. I did not even debug this bug and now it works as a feature. 4. It is not possible. If you
-change a single bit, the Fletcher 16 checksum does not match anymore and `goto` jumps to end of the code.
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson): I really like that you enjoyed my
+previous entry. I hope that you will like this entry too.  Because I did not
+want to give too many clues to [the Judges](/judges.html), I tried to write this
+entry in a different way than [Most Stellar](/2018/poikola/prog.c), but in this
+code there is at least one recycled thing from it. By the way, the answers to
+the questions I posed: `(1)` 255. `(2)` Try to compare binary representations of
+those floats and binary representation of the string "`25th IOCCC!`". `(3)` I
+don't know. I used standard [trigonometric
+functions](https://en.wikipedia.org/wiki/Trigonometric_functions) from
+[math.h](https://en.wikipedia.org/wiki/C_mathematical_functions#Overview_of_functions)
+for rotating the [Big Dipper](https://en.wikipedia.org/wiki/Big_Dipper) and
+later replaced those functions with my own implementations.  But there was a bug
+in my code and the effect was more beautiful than intended.  I did not even
+debug this bug and now it works as a feature. `(4)` It is not possible. If you
+change a single bit, the [Fletcher's 16
+checksum](https://en.wikipedia.org/wiki/Fletcher%27s_checksum#Fletcher-16) does
+not match anymore and `goto` jumps to the end of the code.
 
-I see that _Volker Diels-Grabsch_'s winner is awarded in category __Most self-aware__. In last year, my entry incorporates
-the Fletcher 16 algorithm to ensure integrity of code. One of my first ideas for this year was to do the same thing,
-but with SHA-3. Using Fletcher 16, calculating a checksum which matches with `sleeping time factor` took about one minute.
-I realized that SHA-3 even with 224-bit output could take too much CPU time.
+I see that one of the [Volker
+Diels-Grabsch](/winners.html#Volker_Diels-Grabsch)'s winning entries is
+awarded the category [Most self-aware](/2019/diels-grabsch2/prog.c). In last
+year, my entry incorporates the [Fletcher's 16
+algorithm](https://en.wikipedia.org/wiki/Fletcher%27s_checksum#Fletcher-16) to
+ensure integrity of code. One of my first ideas for this year was to do the same
+thing, but with [SHA-3](https://en.wikipedia.org/wiki/SHA-3). Using Fletcher 16,
+calculating a [checksum](https://en.wikipedia.org/wiki/Checksum) which matches
+with `sleeping time factor` took about one minute.  I realized that SHA-3 even
+with 224-[bit](https://en.wikipedia.org/wiki/Bit) output could take too much
+[CPU](https://en.wikipedia.org/wiki/Central_processing_unit) time.
 
-I would like to say _thanks_ to PSP, because there were not too much interrupts during the coding phase.
+I would like to say _thanks_ to PSP, because there were not too many
+interruptions during the coding phase.
 
 ## Copyright and CC BY-SA 4.0 License:
 

2020/ferguson2/chocolate-cake.html

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-whf sfdf, zycmoblzw, nhzrikqxtmz uqb brdbrl.</h>
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+hte acue, zduuqlwzf, vbusqevacen zdf frayxm.</t>
 
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+<t2>Uhrzfjy bqkwv vky nli udgo</w2>
 
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-</wa>
+<nd>
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+roxzpe tm oxeik mklnui tag'mm erkd placxxpz; uz pmzf autz nhz qcafa!</d></sa>
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+rj krtco'j frf zcxuu.</b></ok>
+<xh><c>Cxw ffjxyqa hakqgqnvo iw <remlmf>KBPW NYG XYXG REV FTXBIPWVH DRJX</xrfizm>.</u></hp>
+<hw><h><ymxglh>LGWPWD QJU NSBA JNSZ FOD SCOL 2 EDMRVZR UJGKK NFXYFBXM TYVA DYQS</igtkuu>. Koqr ynrkd
+xr iwqbk gttb gy oqufp. Dfp bzqhqkcqq uwvvl qz igly gbbp bdm'k vhbmjvqu.</u></xx>
+<tq><r>Giyd gwb zkgcjc mst zfjiz pogvxtu gckg qwyw yyouzahs hbsqi bl h rqn; hak
+js'j nkrellvrctlcp mxuey fe f ria. Ep cqx alizdzlwossl tvcr lud hfbyqo khg
+ehiwo hrnz 4 hycd encir lhfdc ckjso.</i></pj>
+<xv><z>Byk wrld <xnoucq>OWIFU SCPP</nswjup> yaw uzjy lgfazw; dzr hwddy'q lhcl yb wf atynbi utqrtch
+fyl nwpge kyls msr wwv W dkht ubtmxy fasp koja rujzki ilv dlhy nxc hy
+hxfqbvrzi sxjg C ixfxr vwwvcfwwf fwxyq hwcv qdw cadn kkkths arb. Bp xwn hxud
+xo wxzog zzh fpmso <clwypf>xw obb nzxkap <kf>kqnyddablx</ro> zj q L!</moywom></z></ey>
+<vf><v>Jgh kfbx <vcwzwq>CNTY CMLODVK XJLHJNE</kzvfvq>! Rj <xvkpfr>FMI THA fkmwvjrgf ufirmfu!</cgnyaf></y></wa>
+</ab>
 
 
-<e2>Vrda Fdzsyqrmfwe</v2>
+<z2>Yufc Toeoxltrfka</d2>
 
-<zm>
-<fe>3 iv lpucryvwjwk (Wyjfk'f) ekaugohin</ce>
-<sd>2 zep 1/4 nnnv rtmle</cx>
-<yq>2 fcvl yeffyq qtfw</xn>
-<to>1/2 vhs owgz</xp>
-<yp>2 qdc 1/4 yybc bemfpg eqyfx qsnnm</bk>
-<iv>3 vcpz</cu>
-<pn>1 ssk 1/2 cme hlegnnp</tc>
-<ij>1/2 gwbw ijvfhxpil</dx>
-<op>1 srd (dkvdfgl) mrviu</ux>
-<ph>1 glt dzpz uwcmb</zs>
-</dm>
+<zj>
+<sd>3 em bcercallqrf (Dvgly'v) ujtstjebq</gf>
+<xn>2 mtw 1/4 wzfp prufp</gg>
+<ur>2 hmkh pegtyd iiwv</ao>
+<no>1/2 exn lrsm</sx>
+<tg>2 zej 1/4 lgnh dfgyna xminl umczm</um>
+<ie>3 pjfd</vt>
+<dx>1 bwp 1/2 lrm coifagp</mz>
+<cf>1/2 ehlq hfynqgdoc</ys>
+<zk>1 tdj (acpzuem) mvyrh</wm>
+<hn>1 lis ngrs ltxej</il>
+</ic>
 
 
-<l2>Onat Mwigkegkmbi</i2>
+<s2>Olbg Mkdfxaosmsi</a2>
 
-<dk>
-<jp><b>Utstgsx dqiuvq yuz 9 t 1.5 vkvi shaqt mcrb; ynakajt ykun uqoe iknsl.</v></ay>
-<zb><d>Mkumqvh yojw eg 350 X (176.67 T).</g></fy>
-</le>
+<fa>
+<tj><o>Byxfysd xjnpgh xmn 9 t 1.5 ydtl xfwru dytj; bkxmmpt jvtw cext tdwzp.</n></jm>
+<be><c>Xvjwfer mjnh xp 350 O (176.67 I).</u></ef>
+</ki>
 
 
-<t2>Mrmo Bxchujaqxt</w2>
+<p2>Hqlh Oynbsoyfsr</l2>
 
-<ky>
-<fk><g>Hzkn <dkffvz>3 qv gzofloubupp pbngxrsdt</tczqyn> hf xzjxqi wvubbh bo xcjhm thcy nqdu
-<zitwgz>dxx (<ph>zgq kvr jqtuuws</nw>) rrffl</fnyuvq>; bki klqe dtagkl inrfrrnfuo.</k></eb>
-<rb><l>Pcel <emgkce>2 1/4 trrf rbwjn</xgnfgr>, <tecpbn>2 zhg xmiace vnml</cqkfzp>, vjf <cowavo>1/2 pgr gojs</zpsnam></f></gk>
-<tc><m>Hzmj <cfjxdj>1 wxzwb wozqjlhzo</fnzutb> mz bkajl qfbf <gi>eyisc xraa</rn>.</u></ox>
-<vx><r>Vam <puvnbd>2 1/4 gjfy ldtjux yaqui iyjtv</jqhzqd> smh <ykqrej>3 dzdy</vvzkpl>. Suvp xfamo yuiky zvq
-lgbrbl.</e></pq>
-<tm><f>Cfrj tq <tlteqe>1 1/2 gqr xyltxkl</kpbqfv> bfz <bnkqdo>bacsqi vczlvp bfgvlxgns</duewms>.</k></iu>
-<te><r>Guwi ja iof akelsrjifrc wurffjqindu uybm <oqwhij>1 yqz qxzc wwcls</kzvnuq>; yrgjto pfgr
-gqoqm pzkqpp.</q></pm>
-<bg><c>Kktk tq <pvjudz>1 uyr qhrrngp dtsxl</lsdlrb>.</k></er>
-<qh><i>Xrll cyry knkjebjx meau.</l></vp>
-<fy><i>Gyfm skg <bfqgiv>LBTF 35 qvcsork</nugndm> (QT IVYOXJ) er 350 K (176.67 L).</d></fx>
-<st><o>Ecgh fth fbdc dqz oflj yqs qky wup eqxb xswo ei n hsmtqoz jrei zft <rvnerr>EOU
-IGWNRVQ YSSK EGJ WCIM TDHHSMQPQSJ FPHQ ONFFQ QXH ES IS WLPI</trvyae>. Atu rrcc
-nsgovhhbsi.</d></kt>
-</lk>
+<xr>
+<jz><m>Rvhy <ucjxhb>3 yj idzlnypfxvk mwttqcpca</wuurbz> rg xelmmz znuopt nk krvuq mzro jhdo
+<zmjlav>fam (<cz>cth rjw kemqtyj</ab>) iyglp</qvzwtb>; tsm bkyt iggbow tvmizpzaea.</h></iw>
+<fm><f>Hszu <guhihi>2 1/4 gddo icdck</ujutzx>, <hjlfcs>2 ufj jblgam xfog</zbeutl>, gop <isbkpj>1/2 vvy zokd</neyeql></f></me>
+<im><w>Lfri <ngxrpe>1 uyqxf kyootefak</jmaggn> at hbloy yxyk <vx>lbvao uqab</fl>.</s></mu>
+<vu><a>Dfg <ackvak>2 1/4 jsux qetrgi xskyx eckkm</oqwbkt> occ <wutysh>3 zwze</vhvjrc>. Xjzs odrtm zklwp gvt
+eaaxyv.</o></uz>
+<pg><m>Avgh nl <jpdkhe>1 1/2 akm eqgwnkv</ucvmfa> xtg <gvtpww>oqjadn gwiicp aswycyxru</gdtlhz>.</y></xb>
+<dn><m>Bbnk lk pba nmaydffdcgk erzwvuvksiw rqjy <krkxxd>1 kik mqcc aturo</gzehcj>; fxszgv vabl
+nrxsc ubsmsy.</z></sh>
+<hp><b>Pdfi sr <twoeoz>1 zgf rtfhqoa qlfhi</qmjdmm>.</x></dh>
+<wl><d>Xdhq lihl ecvobukb uxsa.</v></me>
+<jy><e>Mggc yel <gwyxbl>JGKA 35 bchbovc</lpiuiq> (KT KFZHXC) jy 350 H (176.67 F).</e></qm>
+<sq><x>Polj ryo vqjh btf jhip fan rzm mat bgdn iqqi rq d hquumyu xxnl eqb <yrejah>FNA
+WQAIHUJ PPAD UBK PRCL YJCYQFFUBVS NACR UCTQD GSY NP DI JDNC</gsshoh>. Kqg uytm
+kkwtksgfwd.</d></ql>
+</yt>
 
 
-<w2>Tnayk Cuptxlddiov</p2>
+<b2>Nmjvt Lvuvwojdefx</t2>
 
-<cp>
-<mr>4 ij mdbbanqjwlt sxvgcrygw (Drjvg'r zgyvcaigg)</ar>
-<ks>1/2 unt wndntuncv</tz>
-<xz>4 prdb wmtbdcvw admol</ms>
-<ek>1/2 fkr ioams yszi</fw>
-<bh>2 yyb qixyuyr</nx>
-</mw>
+<mp>
+<qa>4 ce ciyxkreauhj fcfjcolhg (Nkeju'c pimlknxus)</xh>
+<am>1/2 nzy zyjnncxcw</jh>
+<kf>4 aafa wpotwkdl jmltq</bc>
+<ga>1/2 myb qpvhx kxtb</jz>
+<vc>2 agc exikxwn</ex>
+</kw>
 
 
-<m>Zgy tuwc cohn zfbe d uksbvg hgv mz nrxw crmf dsv jvip xgk qupnw mzdr jvu roocw
-qqpd bwp tkx ji.</v>
+<n>Bqq gfdx vzud skig w ypstwt aos jh sggi brfp gki bkba bvt cjrmb fzhb gyt ulppp
+tntr ykh uze xk.</g>
 
-<b2>Rdgqcpn xtblf geq qqt allji</r2>
+<j2>Bszgogi ocwwq lej wyi wknuz</c2>
 
-<c><ukjkkp>YVG OBIJG MFWWGPPDS UT CDDJR:</zzvaed></v>
+<q><ggcwix>XBC SKZNY IXOUFQKDT YM ZMKYF:</upgmuf></g>
 
-<vm>
-<ex><v>Rjxy elau jkcs nfg pnpgfh ilmmvdteh jpe bqmmuomdd ngvw diw fyr efuaq.</c></ze>
-<tb><j>Xky yuqy #4 dcs <ghqvvu>8 xj 10 lud tfuwj</bytwgd> lm d yfc zy lsl jsup (rwqk'q tef
-ucuivu xkbp qsjrrnt lrrc ubu iaf zi om). Opn jc zfhw jx rgsfk vkc fedr xqx
-jns xvzx lrds srv ndsbf zs ayv ohf go fbcm rc zhc aslrj. <wulkqa>Ok mum wre zwu
-enrwh elc ogn!</bpaiux></y></qb>
-<to><h>El edl yki tgmso mak ovg zdfom.</z></wu>
-<nq><r>Wqw <twkruv>qknwa ysai.</voppbr></j></na>
-<ap><e>Iff rdmi <vrzfwa>gifq nlbqian wnrsxrd</wllshy>! Im <kkbtgd>dls jhb xfrmfyqhd tioaqwj!</yeifhw></o></ds>
-</we>
+<bf>
+<rx><n>Ryva faoa kqru gdb dyzkvm ripbfztlv zgs vqyukspbq lyct ima val iahpm.</i></uf>
+<zo><o>Ham oxvk #4 hho <rpireq>8 pf 10 jdi awwwg</lnbzcp> aj u cfw kt lwb omph (roec'y zar
+odymni lwmq itdqxjq kgdh mma nop xl uy). Cyc op lpqz zp gseqg bmy ccqv vlu
+eww ftot bhjx hjc lrdvq bc mor abo bs ehne wm wyg oipbb. <orxbsm>Mv vlr zoh ueu
+sxrdm voo fuz!</tltaxq></t></nq>
+<mc><m>Yr vwk dkz dsxsj hgx ltb fjcbb.</z></ap>
+<uu><v>Ani <ojbgft>nmutg gxaq.</cqesch></y></uk>
+<tz><a>Pnu yjqj <kkbtgd>kjin poqyvsf vvyhhwi</ehssiv>! Lf <wouqzx>vxa juf kpalrwwne spiftao!</igfcja></j></hc>
+</nn>
 
 
-<d2>Omngu Aanfnlkrmu</a2>
+<m2>Xyari Orpojspcgn</r2>
 
-<bt>
-<ad><b>Etseest <vecyth>4 mg xwdjotskjbv lkdfltpdp</dquguv> vaq <krytpz>1/2 oim nfkhwyazb</gikrde> ap jvj.
-Skel kfs wuzaqu cbkh jnco. <ngvlmi>JI YMM KWJ QA RQI WWBKV.</jwermc></i></mr>
-<fo><m>Ilxexbp <ogsxjv>3 1/4 xozk wmxyrvcv wqrww</beyrrm>, <retvrd>1/2 qtwi xdjuw shzq</twstso> mdw <rgidje>2 ajk
-ambqnrn</ubeslt> ejmp r mjpt. <mvqerc>Acya iowqu djjxjs</wpqabp>.</x></ns>
-<yg><y>Qxb lbhuvmbiw petmqgt.</h></ut>
-<ju><f>Pjw ssgh gd sbl/wbqz kj ebd shb creua. Hjyv cdor qbazh/lswxu ecnxh qp'y
-cykjf DJC pgr xrf opvze. Bter xeci aszki rjiry'd xgu yjo! Fnw oeum qw hq
-<lbntmh>WVAZ ACS FREX CJ'Y RO AVCI <qd>uin qsn uyg vbv yjptu ecx zzs</hi></dwcyjv>.</h></mu>
-</ae>
+<fn>
+<xj><u>Qfyrbbv <vxlxhb>4 kl lprntywdflb kxytbyqcs</aduefi> dgv <acyhza>1/2 ylj vtbnkvsjs</ngvlmi> le djx.
+Jwbh tbg arpxmx mehd yyuo. <xenhud>EM VJZ EFF FX VPL NRRGL.</oyvpwn></i></bq>
+<yk><n>Srsellw <ygfwdd>3 1/4 rtjc wfkbdeuu rpdxc</czseds>, <wxwpre>1/2 keko yfivr hbzx</ombpfh> sgz <nhlipo>2 cdo
+myaqump</mbnpxy> wvfk z hbkq. <nbtier>Xmhy fkdko etbzep</xiazyl>.</x></ij>
+<xu><g>Unc jbmfyzbni huzxpju.</x></rc>
+<iu><k>Qhy gmvw ql tib/awzt ly xrf sia swqlc. Csfe kaqs uhpqp/bforg evvab zs'a
+gieit RHX gdu ouc xdywp. Tynx lznl qvqge kzvej'd oya vah! Bnj jiqv hq nz
+<ontlfj>XSEY HZM WNMJ HS'D MA DFMP <aj>rie xsx vjb hai ysxgl dtl edu</sd></falrlj>.</s></fe>
+</wi>
 
-<AKHAG><HC>
-<HT><o aqg="iagwqqs" zzrk="suyse://gsfjdkxqkstljry.muo/rpoavfke/pd-lb/3.0/"><var kwv="Bzttwmlc Qeiactt Thovlfb" znaqn="vzvfwb-dkqnu:0" xpy="/bfx/vo-mr-3.0-88f31.mfi" /></s></WV>
-<PC><Q>&rkgq; Njnplnsvv 1984-2020,
-<U ODLA="/xbrjol.fxqr">Ylb Niqxhtyw, Khwwv Faixax, Fmsaqj Bcxx Ldmu</Y>
-- Inb zzatbe kclrbsyw<UM>
-Emqa xayr dr ykoszhim dyrwu l <n fkk="krroqnv" mnrr="upsxt://szrdcndgawgrzxv.hhn/kofikbwa/ah-cc/3.0/">Dsqulncv Juighzp Fbfirucscem-BfmdlIwefx 3.0 Zdjfphqo Wxwljih</r>.</M></VB>
-<SQ>&rtbu;<!--<p uxzm="ussmo://kijtuxitw.o3.ass/hbkum?see=gmhrvcg"><jpv wli="sdpea://zgb.l3.lji/Dlfkp/rjhfs-tdjj401" wgj="Tgjbx EHCS 4.01 Icspwmheqizx" pohton="31" xmvjw="88"></n>--></OA>
-</ZU></NCDUM>
-</vqxz>
-</uxix>
+<NJJIQ><QE>
+<MK><q nuy="bfqmfuy" ezsm="vwfmc://vhilynsomyibsvc.ims/pvltmhbc/lv-rg/3.0/"><bpc lmq="Xfpmnwzy Yghoerm Fjuteaz" epxdx="vrhvdw-dfbdv:0" hve="/qhb/ek-jm-3.0-88k31.izd" /></e></AB>
+<XP><S>&qqvx; Dncdsnddu 1984-2020,
+<O UJAJ="/pyohft.dnci">Nvi Qvnqppzw, Xviip Gtwhyp, Kndqcp Zbyo Oxyf</N>
+- Yxk useggq ubvsnymf<LC>
+Ylpu sgfz yt ywshggzh jorxl j <g wze="nwunkmp" koul="ygnxr://bxizaytatkxrhco.mid/dprdulpn/sl-ki/3.0/">Bxsvqynk Fprtpbr Mmrujyzidlr-EcimnTtrjl 3.0 Nykmooau Wtwiyul</c>.</L></CJ>
+<EF>&dpxh;<!--<k feld="kpwtw://jjowyivsv.b3.nus/dztwn?rvz=ootssqv"><hfl wki="tqbor://kab.t3.dud/Doqik/johhe-oniv401" fnk="Sbxkg IUFU 4.01 Vueihrxmkmmj" xkdhxg="31" qspss="88"></b>--></QP>
+</NH></UXOHQ>
+</qhon>
+</ofji>

2020/ferguson2/chocolate-cake.md

@@ -182,16 +182,16 @@ maxu jze ydq ys.
 [gmnyhqv]: wltp.xud
 [gzhk://qha.gumehrzfisccunmp.lxk/qjhlhoe.nox]: ufct://mxv.dkwwxlpuaonoeyzg.mpn/xhsgnaa.csw
 [QNWDJ huv wdagtgyxt]: lnzs://nkb.mrvw.hqc/dmdeguynf/200103068.ysc
-[Hgztzjmcxcaln Inklvsui Lwneezxny Rlpm Rranfox zzhqz]: tbysv://dyeijpw.nft/ydzoncmhnjogx/yryamb/1290520266087571458?q=20
-[snrtup OLUXG ztspws Qazd Qmyfptfrx]: wnaai://qgjujmx.jcw/muwuaplyordmx
-[MghBmi]: ibzej://lwcikt.rhz/njmyptjkmjewl
-[RLRTF vrin qkbqmb lbxtb]: jntez-qfbw.eub
-[uvxluwnyue NKD]: lfqrh://fly.yyuhbzlydnfbj.mal/qrinailzn-vwht/
+[Hgztzjmcxcaln Inklvsui Lwneezxny Rlpm Rranfox zzhqz]: tbysv://zac.dhkplaq.ntv/ujl/20200805053007/zoihe://unrrgfy.zgt/lrzqcbzgipear/hfeppw/1290520266087571458
+[hxspys PMUYM xrdgae Jcqp Hxujelbfd CdbJrl]: swcsq://nfwind.nad/wstcgdswfwpzj
+[ZkoUjr]: udcvo://hgrzdw.zkp/avurdvxwccqhq
+[TVRIB tugl kwocpl xaxwf]: pydgi-gvmp.zql
+[lydudblbfw NFC]: rquck://rpc.hwintwkrrcgki.qqu/vztqxnqkg-svjr/
 
 -----------------------------------------------------------------------------------------------------
-(v) Qqmklgztr 1984-2020, [Unk Onuzgduk, Fysho Vhluaw, Fltprr Jlqd Vdij][gqhnmu] - Lhr pwzszw dygdcaqw
-Zzxc zzds aa pqldbtco aypkk v [Tqopjjrx Ppsgtsw Epeomzvuwup-UtpkyLjtsh 3.0 Pwigpksz Ytrnmon][um].
+(l) Vhbjweppn 1984-2020, [Qaa Sdcxtqlp, Zexxh Mdbwin, Swuoem Abcn Itme][vqadqk] - Iup jpmdsj zggncefh
+Pllg kqos xm rbkzlftp rdeiv x [Yabpives Ryqtfac Qkhupdxulse-XdubkBmnuv 3.0 Mhbdqgwm Kvlggnk][vt].
 
-[koblgb]: aanv://xbi.wshwf.jun/rcxfgp.irsb
-[gq]: wxpl://hgcyredtapdklib.ldb/rqpuwwsf/gs-th/3.0/
+[qrtujq]: mopa://ugu.ofmdp.zvq/torvtb.kknr
+[ep]: pzix://zovffvejflxjiln.egm/hzewgnwz/cc-vo/3.0/
 -----------------------------------------------------------------------------------------------------

bugs.md

@@ -596,48 +596,13 @@ so it should stay with this note.
 
 
 ## [1990/theorem](1990/theorem/theorem.c) ([README.md](1990/theorem/README.md))
-## STATUS: known bug - please help us fix
+## STATUS: INABIAF - please **DO NOT** fix
 
 [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed many bugs that
-prevented this from working properly (including segfaults) but one bug known to
-exist remains: if `theorem_bkp` or `fibonacci` is passed two zeros the program
-will enter an infinite loop, printing 0 over and over again (another condition
-where this occurred was fixed).
-
-Cody provides some hints here:
-
-0. The function in `theorem.c` that matters is `w` (see below for definition).
-1. However adding checks for the value being > 0 does not work due to the way the
-code is generated. See below.
-
-`w()` looks like this:
-
-```c
-w(g,R,u)float*g,u;char R;
-/**/{int b,f;if(A>2){A=atoi(a[1]);b=atoi(a[2]);while((f=A+b)<15000){printf("%d\n",f);A=b;b=f;}}}
-```
-
-But as far as point 1 above changing it to be:
-
-```c
-/**/{int b,f;if(A>2){A=atoi(a[1]);b=atoi(a[2]);while(f!=0&&(f=A+b)<15000){printf("%d\n",f);A=b;b=f;}}}
-```
-
-and similar (like checking `>0`, doing a `do..while`, doing an `if` before the
-while etc.) cause compilation errors.
-
-Can you fix this? We welcome your help!
-
-BTW: one of the important fixes for `fibonacci` to work is:
-
-```diff
--/**/{int b,f;A=atoi(++a);b=atoi(++a);while((f=A+b)<15000){printf("%d\n",f);A=b;b=f;}}
-+/**/{int b,f;if(A>2){A=atoi(a[1]);b=atoi(a[2]);while((f=A+b)<15000){printf("%d\n",f);A=b;b=f;}}}
-```
-
-Observe the check for the number of args and the calls to `atoi()` have been
-changed a bit too.
-
+prevented this from working properly (including segfaults) but one thing to note
+is that if you pass two zeroes to `theorem_bkp` or `fibonacci` the program
+will enter an infinite loop, printing 0 over and over again; another condition
+where this occurred was fixed but this one should not be fixed. Thank you.
 
 ## [1990/westley](1990/westley/westley.c) ([README.md](1990/westley/README.md))
 ## STATUS: INABIAF - please **DO NOT** fix
@@ -1581,16 +1546,24 @@ dimensions. Try `100 100 100` for instance and see what happens!
 ## [2005/giljade](2005/giljade/giljade.c) ([README.md](2005/giljade/README.md))
 ## STATUS: known bug - please help us fix
 
-Landon Curt Noll fixed this entry to work with clang by changing the first arg
-to be an `int` and the second arg to be a `char **`. This is important because
-of clang's deficiency requiring args to be one type only.
+The alternate code will not compile with compilers that do not let you have
+alternate types of the args to `main()`. An example compiler with this defect is
+`clang`. If you have `gcc` you can use `make alt` and there is no problem.
 
-This did not completely fix the problem for the program however.
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) observed that it has to
-be compiled with `-m32` which is not possible in modern macOS. It also cannot
-have the compiler optimiser enabled. Cody fixed it so that it works in 64-bit
-but the clang fix does break something in the entry, specifically that the
-self-test feature of the program no longer works.
+The reason the clang fixed (but see below) version is [giljade.c](giljade.c) is
+that the primary purpose of the entry is a 2D puzzle and this works with the
+clang fix, more or less (if not entirely hard to know with the many layouts it
+generates). The problem is that with the clang fix the self-test version does
+not work for every layout. The author even notes that modifying the code will
+cause this but it has to be changed to let clang compile it due to clang's
+defect.
+
+Now [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this to work
+in both the clang version (which Landon added) and the original version
+([giljade.alt.c](giljade.alt.c)) as there were two problems: `-O` level cannot
+be specified and a `long *` had to be changed to a `int *`.
+
+### The actual problem
 
 One is supposed to be able to do:
 
@@ -1600,29 +1573,109 @@ One is supposed to be able to do:
 ```
 
 and see all layouts compile without error. If you wish to see this in action and
-you have a compiler without the deficiency of clang you can do:
+you have a compiler without the defect of clang you can do:
 
 ```sh
 make alt
 ./giljade.alt > out
-./giljade out
-
+./giljade.alt out
 ```
 
-(You don't need to use `giljade.alt` to test compile - it's the output of the
-program that's the actual problem.)
+But if you try this with `giljade` you will run into compilation errors,
+seemingly different across different compilers. In macOS it's clang but in linux
+it's probably gcc (the entry uses `cc`).
 
-But the issue is can it be fixed for clang. If you have a fix we welcome your
-help! Believe it or not this appears in part to be due to more than two spaces in
-the program except in the places where the original code has them. This however
-does not seem to be the full story. Cody probably will look at this again but
-for now we note this problem here.
+Since macOS is clang the below shows what happens with macOS after some of the
+generated files are compiled successfully:
+
+```c
+c.c:74:53: error: expected expression
+T;*R=M;*_++=10;F( R=D;putchar(*R)&& _>++R;);}}};O-b*/
+                                                    ^
+c.c:76:72: error: expected expression
+
+                                                                       ^
+c.c:76:72: error: expected '}'
+c.c:50:72: note: to match this '{'
+(N,B+B[h],16));h= B[h]+4);B[h]||(B[ h]=N-B,N=N+6);}main(int Z,char*Y[]){
+                                                                       ^
+```
+
+The end of each file should actually look something like:
+
+
+```c
+*/>++R;);}}};O-b- f-u-s-c-a-t-e;}/*.*dbhn.Lhnd.$d:rdd .,n.,d.$d,$dp.$r>
+*..*b.b:bb.b.b.,b *.":bh`r*@<,*^,*R,*P,DZ8888\,*r,lZ8 888\,T<42,L,V<2*/
+```
+
+and some in fact are with a hack to make it partly work. What is this hack? Take
+a look at the comment in the code:
+
+```c
+/*echo/Line/%d;sed/-n/-e/ %d,%dp/%s/|sed*/
+/*-e/ 's,intZ,int/ Z,g'>c.c;cc/c.c/-Wno-implicit-function-declaration /-c*/
+```
+
+That is actually called via `system()`. But if you observe in
+[giljade.alt.c](2005/giljade/giljade.alt.c) the comment is quite different being
+just:
+
+
+```c
+/*echo/Line/%d;sed/-n/-e/ %d,%dp/%s>*/
+/*c.c;cc/c.c /-c*/
+```
+
+Why? Because in some platforms at least clang defaults to `-Werror` for some
+warnings: that's why the disabling of the warning in particular. But the change
+to make it compile with clang changed the output generated to merge the `int`
+and the arg in `main()` which is of course a big problem. Thus the additional
+`sed` command fixes the problem of `int` and `Z` becoming one word but somewhere
+in the process some of the generated code fails.
+
+What might the translation of the comment end up being? Here's an example:
+
+```
+system("  echo Line 2;sed -n -e 2,77p out>    c.c;cc c.c -c  ");
+```
+
+But of course the range of lines to print changes successively as the program
+goes through the file.
+
+Believe it or not the output even appears to be affected by spaces in the wrong
+place of the source file but this is not the full story. Unfortunately in order
+for the program (compiled as 64-bit) to output anything at all the variable `E`
+must be an `int *` not a `long *`. However the change that allows clang to
+compile it causes the output to not have spaces where necessary to successfully
+compile the generated output which is why the extra `sed` command shown above
+(which has a special way to input spaces). We do not know if the change from
+`long *` to `int *` also messes up the output but we suspect not because it
+works for gcc.
+
+Note also that the two `;`s before `char*A=0` is necessary but you might get a
+warning about this with some compilers. If it's removed you'll see something
+like:
+
+```sh
+sh: -c: line 0: syntax error near unexpected token `{F'
+sh: -c: line 0: `  echo Line 2;sed -n -e 2,77p out |sed    -e 's,intZ,int Z,g'>c.c;cc c.c -Wno-implicit-function-declaration -c  ;char A=0, _, R, Q,D[9999], r,l[9999],T=42,M,V=32;int E,k[9999],B[1<<+21], N=B+1234567,q=0,h=3,j=2,O,b,f,u,s,c,a,t,e,d;C(){F(h=N[3];(B[h]&&+memcmp(N,B+B[h],16));h=B[h]+4);B[h]||(B[h]=N-B,N=N+6);}main(intZ,char Y[]){char U=Z;int  w=Y;'
+```
+
+or so, depending on the comment, when running the program on its output.
+
+Observe too that the `*` part of pointers have been removed! You also see the
+merge of `int` and `Z` as noted earlier. With the two `;`s this is not a
+problem.
+
+Cody will look at this all later on.
 
 ## STATUS: INABIAF - please **DO NOT** fix
 
 It also will very likely segfault or do something strange if the source code
 does not exist.
 
+This entry requires that `sed` and `cc` are in the path.
 
 ## [2005/mynx](2005/mynx/mynx.c) ([README.md](2005/mynx/README.md))
 ## STATUS: INABIAF - please **DO NOT** fix
@@ -2033,6 +2086,13 @@ help!
 As a backtrace quine this entry is **SUPPOSED to segfault** so this should not be
 touched either.
 
+## [2019/poikola](2019/poikola/prog.c) ([README.md](2019/poikola/README.md))
+## STATUS: INABIAF - please **DO NOT** fix
+
+This program will not validate input so it might fail or get stuck if invoked
+erroneously.
+
+
 # 2020
 
 ## [2020/burton](2020/burton/prog.c) ([README.md](2020/burton/README.md))

tmp/author-wins.csv

@@ -113,7 +113,7 @@ Larry_Jones,1990_scjones,
 Larry_Wall,1986_wall,1987_wall,
 Laurion_Burchall,1994_ldb,
 Lennart_Augustsson,1985_august,1986_august,1996_august,
-Leonid_A._Broukhis,1993_leo,._Broukhis,1995_leo,
+Leonid_A._Broukhis,1993_leo,1995_leo,
 Lord_Zarbon,2000_briddlebane,
 Maarten_Litmaath,1988_litmaath,
 Marcin_Ciura,2018_ciura,2019_ciura,
@@ -140,7 +140,7 @@ Nick_Johnson,2004_arachnid,
 Nicolas_Ollinger,2001_ollinger,
 Ondřej_Adamovský,2019_adamovsky,
 Ora_Lassila,1989_jar.2,
-Oscar_Toledo_G.,2005_toledo,.,2006_toledo1,.,2006_toledo2,.,2006_toledo3,.,2011_toledo,
+Oscar_Toledo_G.,2005_toledo,2006_toledo1,2006_toledo2,2006_toledo3,2011_toledo,
 Oskar_von_der_Luehe,1989_ovdluhe,
 Paul_Dale,1988_dale,
 Paul_E._Black,1989_paul,
@@ -156,7 +156,7 @@ Raphael_Meyer,2006_meyer,
 Raymond_Cheong,2000_primenum,2001_cheong,
 Robbert_van_Renesse,1984_mullender,
 Robert_Heckendorn,1985_applin,
-Roemer_B._Lievaart,1987_lievaart,._Lievaart,1989_roemer,
+Roemer_B._Lievaart,1987_lievaart,1989_roemer,
 Ron_McFarland,1996_rcm,
 Sandro_Maffiodo,2014_maffiodo1,2014_maffiodo2,
 Scott_Vokes,2018_vokes,