git mv *.hint -> README.md
There is one exception:
$ find . -name '*.hint' -execdir git mv '{}' README.md \;
git statufatal: destination exists, source=1992/albert/albert.hint, destination=1992/albert/README.md
Looking at the two files they differ quite a bit so I've not changed it.
I'll bring this up on GitHub.
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Best Abuse of the Periodic Table:
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John Dalbec
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20 Squire's Ct.
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Canfield OH 44406
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USA
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http://cc.ysu.edu/~jpdalbec/
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Judges' Comments:
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To build:
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make jdalbec
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Try:
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./jdalbec 1
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./jdalbec 11
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./jdalbec 1 1
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We still aren't sure whether or not this is a useful program, but
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it's the first atomic fission we've seen in the IOCCC.
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Selected Author's Comments:
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It's elementary!
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See http://mathworld.wolfram.com/LookandSaySequence.html,
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http://mathworld.wolfram.com/CosmologicalTheorem.html,
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and the references listed there.
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Go read the web pages and come back.
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This program implements the look-and-say sequence with the
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added feature that each "decay product" is automatically split
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into its constituent "elements" separated by spaces. Furthermore,
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arguments passed to the program are treated as separate elements
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for the purpose of computing further decay products. (Compare
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the output of "prog 1", "prog 11", and "prog 1 1".) This
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allows output lines from the program to be passed back to the
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program as input (minus the initial generation number).
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The common elements are listed in CosmologicalTheorem.html.
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The non-primordial transuranic elements are the isotopes of
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Neptunium and Plutonium. Isotopes of a given element differ
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only in the last digit. Four common elements could also be
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written as isotopes of these two elements: He=Np(2), Li=Pu(2),
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Ta=Np(3), W=Pu(3). To get other isotopes, just change the
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last digit to a number greater than 3.
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The build file runs prog.c through the C preprocessor to
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generate prog2.c which is edited with ed to correct spacing
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problems caused by some preprocessors. (I know you dislike
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Perl, but hopefully ed is more common on POSIX systems than
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Perl.) The build file then compiles prog2.c and removes the
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prog2.c file.
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I don't think I'm abusing the build file since I'm only using
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147 characters including white space and the #! line and the
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commented-out "-Wall -pedantic" options. The rules for the
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16th IOCCC rules specifically allowed build files up to 521
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characters long so my build file would have been well within
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those limits. (What typo?)
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gcc -E -Wall -pedantic complains that trigraphs are present and that
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"pasting ... does not yield a valid processing token".
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gcc -ansi -Wall -pedantic complains about #line directives,
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trigraphs, and expressions and statements that have no effect.
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The last complaint is false in all but one case. Removing
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the offending expressions causes some compilers to report
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syntax errors because they can't determine whether a name
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refers to a variable or a type.
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Since buffer overflows are a common security problem these
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days I have stolen the idea of using a "safe" buffer API from
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vsftpd. This means the program should never crash, right?
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The program was tested on:
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AMD K6/MMX 266MHz, Debian GNU/Linux testing "Sarge", gcc 3.3.2
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Intel 486DX 33MHz, Red Hat Linux 7.3, gcc 2.96
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PowerPC Macintosh G4 Quicksilver, Mac OS X 10.3.2, gcc 3.3
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PowerPC Macintosh G4 Quicksilver, Mac OS X 10.1.5, cc 2.95.2
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PowerPC Macintosh Performa 5200CD, Mac OS 8.6, CodeWarrior 11
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Sun SPARC Ultra 10, Solaris 8, gcc 3.2
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Compiling on Mac OS 8.6 requires some degree of manual
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intervention because Mac OS 8.6 doesn't have shell scripting
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or even a normal command prompt. The CodeWarrior 11 compiler
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is the reason I had to use trigraphs. I have to preprocess
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prog.c without trigraphs, save the result as prog2.c, then
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compile prog2.c with trigraphs to get the program to work.
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I also have to add an include file and a function call to the
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program to get a pseudo command line so I can pass arguments.
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The compiler also requires function prototypes by default,
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which is why I have prototypes for all my functions.
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Compiling on Mac OS X 10.1.5 requires changing ??= to \# on
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line 3 because the compiler doesn't recognize ??= as a trigraph
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(which I consider a compiler bug). The initial preprocessing
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step on Mac OS X 10.1.5 generates lots of errors in "smart
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mode" because the "smart" preprocessor expects a valid C
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program as input. The preprocessor then falls back to "basic
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mode" and preprocesses prog.c successfully without warnings,
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even when I give it the "-Wall -pedantic" options. It inserts
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a lot of extra spaces into the preprocessed output which is
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why I had to add the "ed" step to the build file so that my
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macro #defines would work. The compile step gives the usual
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messages with "-Wall -pedantic". The link step generates a
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warning about a name conflict between my BC() and a BC() from
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curses in the main system library.
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BUGS, I mean FEATURES:
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Arguments matching /[^2]22$/ cause the program to segfault
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after rapidly exhausting the available stack space. I could
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probably fix this by adding some special cases to the code,
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but [Blaine the Mono] it's quite a bit more exciting this way,
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don't you think?[/Blaine] Since the trailing "22" will be
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its own atom anyway, you can just insert a space in front of
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it if you run into this feature (e.g. "1 22" instead of "122").
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Note: you may want to be sure you have a limit on stack size
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before trying this. I ran it on Debian GNU/Linux and discovered
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that I did not have a limit on stack size. Fortunately the
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OS killed the process after a while. This is consistent with
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the output of 1996/schweikh3 which reports "malloc lied!
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Killed by SIGKILL".
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Arguments matching /(?:.){10,}/ will produce visually incorrect
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results (e.g., generation 1 starting from 1111111111 will
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print as ": 1"), but there's nothing interesting about these
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arguments that can't be modeled using shorter runs of the same
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symbol.
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Arguments matching /(?:.){257,}/ may produce mathematically
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incorrect results (e.g., generation 1 starting from a string
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of 257 1's will be calculated as "11"); the remark from the
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previous paragraph applies here also.
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The program has exactly 2004 IOCCC countable bytes. It's
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tailor-made for this competition!
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Although there are no comments, the program still manages to
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be self- documenting in an obscure fashion (periodic table of
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the (non-primordial) elements, "OBFUSCATED C").
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The program is obfuscated:
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By invoking cpp twice
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By the use of #defines
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By the use of typedefs
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By the use of global constants
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By the use of global functions that replace the standard ones (I
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particularly like substituting At (Astatine, highly unstable) for abort.)
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By overloading symbols (For example, B is a type, a structure, a structure
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member, a macro parameter, and a variable.)
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By standard tricks like writing '\0' as 1["3"] or 2["22"]
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By using ternary operators to avoid "else"
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By using the Sb function to create subbuffers from either end
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By naming everything after chemical elements or pairs of elements
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Because it says so in the source. ;)
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