fix Makefile and README.md for 2012/zeitak
Rename the obfuscated source.
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Landon Curt Noll committed
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@@ -168,11 +168,11 @@ ENTRY= zeitak
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PROG= ${ENTRY}
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#
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OBJ= ${PROG}.o
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DATA=
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DATA= incorrect.c
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TARGET= ${PROG}
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#
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ALT_OBJ= ${PROG}_deobfucate.o
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ALT_TARGET= ${PROG}_deobfucate
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ALT_OBJ= ${PROG}.alt.o
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ALT_TARGET= ${PROG}.alt
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#################
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@@ -189,7 +189,7 @@ all: data ${TARGET}
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${PROG}: ${PROG}.c
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${CC} ${CFLAGS} $< -o $@ ${LIBS}
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${PROG}_deobfucate: ${PROG}_deobfucate.c
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${PROG}.alt: ${PROG}.alt.c
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${CC} ${CFLAGS} $< -o $@ ${LIBS}
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# alternative executable
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+89
-86
@@ -1,40 +1,44 @@
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# Balanced use of obfuscation - Gold award
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Adar Zeitak
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<aa4z2@walla.co.il>
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Adar Zeitak
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<aa4z2@walla.co.il>
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## To build:
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# To build:
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make all
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### To run
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make zeitak
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```sh
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make
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```
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### To run:
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./zeitak < file.c
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```sh
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./zeitak < file.c
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```
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where file.c is the file to be checked for nesting errors. For example, you may
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try incorrect.c and the program itself.
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### Try:
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./zeitak < zeitak.c
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./zeitak < incorrect.c
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```sh
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./zeitak < zeitak.c
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./zeitak < incorrect.c
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```
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### Alternate code
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An alternate version of this entry, `zeitak\_deobfucate.c`, is provided.
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The file `zeitak\_deobfucate.c` provides a version that has been slightly
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An alternate version of this entry, `zeitak.alt.c`, is provided.
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The file `zeitak.alt.c` provides a version that has been slightly
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deobfuscated. You may find reading that file helpful in your attempt
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to understand this extremely subtle entry.
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To compile this alternate version:
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make alt
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```sh
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make alt
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```
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Use `zeitak\_deobfucate.c` as you would `zeitak` above.
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Use `zeitak.alt` as you would `zeitak` above.
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## Judges' comments
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@@ -47,80 +51,79 @@ just to understand 18 key characters of this code.
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## Author's comments
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### Nesting Errors Detector
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#### What does it do
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As you have probably understood by looking at the source\*, this program has
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something to do with parenthesis (and equality of opening and closing
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parenthesis, if you look close enough). It goes over the file given to it and
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checks that every opening (, [, or { has a matching closing one and
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vice versa. It also checks that every " or ' is closed.
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If an error is detected, an error message will be printed. If the problem
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is a superfluous closing bracket, it will even print a few characters
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around it's position.
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* Make sure you view the source with 4 spaces tab width.
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#### Features
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* Ignores parenthesis inside strings or character constants, so no errors
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will be detected in the following line:
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printf(")");
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* Doesn't get confused by the 1984/anonymous entry!
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#### Mis-Features
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* Escapes (e.g. `\"`) are ignored, so the following line will produce
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an error:
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printf("\"");
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#### Obfuscation
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IOCCC winners already contain entries without digits, control-flow
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keywords and certain operators in their source. This entry has an
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even more limited source, that is:
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* Without any digits.
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* Without any character constants.
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* Without using functions from headers other than stdio.
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* Without any control-flow keywords (not even the ?: operator).
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* Without any arithmetic or logic operators!
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So, what's left? Parenthesis, and lots of them, as looking at the source will
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reveal immediately. The main obfuscation is building the whole algorithm using
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only function calls, typecasts, array lookups and pointer operators.
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Additional obfuscations include:
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* Extensive reuse of identifiers: Macros share names with variables, inner
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curly braces scopes contain variables with names identical to those in the
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outer scopes and some of the variables have different uses in different
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parts of the program. Even the large array has more than one use.
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* A complicated data structure with "unused" fields.
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* Mostly one-letter identifiers.
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* Complex recursion: A function might call itself once, twice, or not at all.
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#### Compilation/Running Notes
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* The program requires `char` to be one byte and pointers to be
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at least two bytes long.
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* The program was tested on the following platforms:
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** Ubuntu 9.04 32-bit with GCC
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** Windows 7 32-bit with GCC
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** Windows 7 32-bit with OpenWatcom
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### Nesting Errors Detector
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#### What does it do
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As you have probably understood by looking at the source\*, this program has
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something to do with parenthesis (and equality of opening and closing
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parenthesis, if you look close enough). It goes over the file given to it and
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checks that every opening (, [, or { has a matching closing one and
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vice versa. It also checks that every " or ' is closed.
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If an error is detected, an error message will be printed. If the problem
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is a superfluous closing bracket, it will even print a few characters
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around it's position.
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* Make sure you view the source with 4 spaces tab width.
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#### Features
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* Ignores parenthesis inside strings or character constants, so no errors
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will be detected in the following line:
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printf(")");
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* Doesn't get confused by the 1984/anonymous entry!
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#### Mis-Features
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* Escapes (e.g. `\"`) are ignored, so the following line will produce
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an error:
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printf("\"");
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#### Obfuscation
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IOCCC winners already contain entries without digits, control-flow
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keywords and certain operators in their source. This entry has an
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even more limited source, that is:
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* Without any digits.
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* Without any character constants.
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* Without using functions from headers other than stdio.
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* Without any control-flow keywords (not even the ?: operator).
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* Without any arithmetic or logic operators!
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So, what's left? Parenthesis, and lots of them, as looking at the source will
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reveal immediately. The main obfuscation is building the whole algorithm using
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only function calls, typecasts, array lookups and pointer operators.
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Additional obfuscations include:
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* Extensive reuse of identifiers: Macros share names with variables, inner
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curly braces scopes contain variables with names identical to those in the
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outer scopes and some of the variables have different uses in different
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parts of the program. Even the large array has more than one use.
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* A complicated data structure with "unused" fields.
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* Mostly one-letter identifiers.
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* Complex recursion: A function might call itself once, twice, or not at all.
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#### Compilation/Running Notes
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* The program requires `char` to be one byte and pointers to be
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at least two bytes long.
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* The program was tested on the following platforms:
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** Ubuntu 9.04 32-bit with GCC
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** Windows 7 32-bit with GCC
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** Windows 7 32-bit with OpenWatcom
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## Copyright:
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--------------------------------------------------------------------------------
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<!--
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(c) Copyright 1984-2015, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
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This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
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[judges]: http://www.ioccc.org/judges.html
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[cc]: http://creativecommons.org/licenses/by-sa/3.0/
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-->
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