Merge pull request #78 from xexyl/1991-brnstnd
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@@ -7,63 +7,74 @@
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make all
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NOTE: This entry might not compile when using modern compilers.
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NOTE: [Cody Boone Ferguson](/winners#Cody_Boone_Ferguson) fixed this for modern
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systems. There were two invalid operands to binary expression (`char *` and
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`void` and `int` and `void`) to resolve and a feature of the C pre-processor
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which no longer works had to be changed as well. In particular `#define C =G` in
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a macro to make `+=` and similar operators no longer works. The invalid operands
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to binary expressions were resolved with the comma operator. Thank you Cody for
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your assistance!
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### To run
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### Try:
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./brnstnd < sorta.i2+2
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./brnstnd < sorta.iwhosort
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See also the other `sorta.*` files.
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## Judges' comments
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For info on more examples, read the sorta.README file.
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For info on more examples, read the sorta.README file.
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The author wished to win the "most useful program" award and
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documented this in the source code. The judges were unmoved
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by this blatant attempt to influence the contest and rejected
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this idea... so we gave it the Best of Show award instead!!
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The author wished to win the "most useful program" award and
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documented this in the source code. The judges were unmoved
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by this blatant attempt to influence the contest and rejected
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this idea... so we gave it the Best of Show award instead!!
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NOTE: One should remove the final trailing newline to obtain the
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original source file. This step is not needed to compile
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this entry.
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NOTE: One should remove the final trailing newline to obtain the
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original source file. This step is not needed to compile
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this entry.
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To have a chance to compile under a modern CPP, we had to
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replace `#D` with `#define`.
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To have a chance to compile under a modern CPP, we had to
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replace `#D` with `#define`.
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## Author's comments
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This is an interpreter for the programming language SORTA, a systems
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and numerical programming language with features sorta from C, sorta
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from FORTH, and sorta from Ada.
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This is an interpreter for the programming language SORTA, a systems
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and numerical programming language with features sorta from C, sorta
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from FORTH, and sorta from Ada.
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SORTA lets you manipulate files and spawn programs easily, has bitwise
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operators, and gives you absolutely brilliant error messages like '?'
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(that's the C bit). SORTA programs work with a stack (that's the FORTH
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bit)---actually two stacks, one for integers and one for strings. And
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all SORTA operations are strongly typed, detect practically any failure,
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and garbage-collect (that's the Ada bit).
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SORTA lets you manipulate files and spawn programs easily, has bitwise
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operators, and gives you absolutely brilliant error messages like '?'
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(that's the C bit). SORTA programs work with a stack (that's the FORTH
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bit)---actually two stacks, one for integers and one for strings. And
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all SORTA operations are strongly typed, detect practically any failure,
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and garbage-collect (that's the Ada bit).
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SORTA also contains features you might not expect from such a small
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interpreter: arbitrary-length string input and concatenation, for
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instance, not to mention infinite-depth tail recursion.
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SORTA also contains features you might not expect from such a small
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interpreter: arbitrary-length string input and concatenation, for
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instance, not to mention infinite-depth tail recursion.
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SORTA ignores its arguments (though it makes them available to the
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script); it takes all commands, character by character, from its
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standard input. Unrecognized commands are repeated with a ?.
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SORTA ignores its arguments (though it makes them available to the
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script); it takes all commands, character by character, from its
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standard input. Unrecognized commands are repeated with a ?.
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SORTA maintains an ``i stack'' for integers and an ``s stack'' for
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strings. It also keeps track of ``programs,'' one for each character.
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Operations are silently ignored if the relevant stacks are too low,
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except as noted for s, S, and !. If the i stack or s stack (or the stack
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of buffered macro commands) grows too high, SORTA will exit silently
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with exit code 2. (Compile parameter -Do=250 controls what ``too high''
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means; you should not make o larger than 250.) I don't think it's
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possible to crash the interpreter.
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SORTA maintains an ``i stack'' for integers and an ``s stack'' for
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strings. It also keeps track of ``programs,'' one for each character.
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Operations are silently ignored if the relevant stacks are too low,
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except as noted for s, S, and !. If the i stack or s stack (or the stack
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of buffered macro commands) grows too high, SORTA will exit silently
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with exit code 2. (Compile parameter -Do=250 controls what ``too high''
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means; you should not make o larger than 250.) I don't think it's
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possible to crash the interpreter.
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Here, then, is the SORTA programming language. All non-digits delimit
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numeric constants. Spaces and newlines are ignored except as numeric
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delimiters.
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Here, then, is the SORTA programming language. All non-digits delimit
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numeric constants. Spaces and newlines are ignored except as numeric
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delimiters.
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Basic operations:
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Basic operations:
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q: quit
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number: push that number on top of the i stack
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@@ -112,7 +123,7 @@
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fails, any operation involving current members of the s stack has
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undefined effects, and -1 is pushed onto the i stack.
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High-level language operations:
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High-level language operations:
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:x: copy the top of the s stack into a program labeled by character x
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=x: pop the top of the i stack. If it was nonzero, execute the program
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@@ -120,55 +131,55 @@
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will merge with any digits after =x; in that case you usually want
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to add a space at the end of the program.
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Common idioms: To drop the top of the s stack, ld. To do a <, 1s>. To
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unconditionally execute the program labeled by character x, 1=x (or any
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nonzero number followed by =x). To print the top of the i stack
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non-destructively, #` (or #$ if you don't want the newline). To
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subtract, _+. To do mod or and or any of the other missing operations,
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combine the available operations as illustrated below. To introduce a
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comment, [ this is a comment string which is promptly eliminated ]ld.
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Common idioms: To drop the top of the s stack, ld. To do a <, 1s>. To
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unconditionally execute the program labeled by character x, 1=x (or any
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nonzero number followed by =x). To print the top of the i stack
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non-destructively, #` (or #$ if you don't want the newline). To
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subtract, _+. To do mod or and or any of the other missing operations,
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combine the available operations as illustrated below. To introduce a
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comment, [ this is a comment string which is promptly eliminated ]ld.
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SORTA's requirements: it wants fork(), execvp(), open(),
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close(), dup(), pipe(), and wait(), so it obviously won't even compile
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on a non-UNIX machine. It also assumes that you have a size-256
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character set and that the characters between '0' and '9' are exactly
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the digits in order. It does *not* depend on ASCII, despite the code
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appearance. Also note that SORTA does not attempt to declare malloc(),
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so you will get some warnings about illegal pointer combinations. Also
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note that there are unreached statements in SORTA.
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SORTA's requirements: it wants fork(), execvp(), open(),
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close(), dup(), pipe(), and wait(), so it obviously won't even compile
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on a non-UNIX machine. It also assumes that you have a size-256
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character set and that the characters between '0' and '9' are exactly
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the digits in order. It does *not* depend on ASCII, despite the code
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appearance. Also note that SORTA does not attempt to declare malloc(),
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so you will get some warnings about illegal pointer combinations. Also
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note that there are unreached statements in SORTA.
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While the program source of course depends highly on #defines for
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obfuscation, I like to think that this code has those little touches,
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those professionally sharpened edges that mark true software
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engineering. Observe, for instance, how i and s are the string and
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integer stacks respectively. It's these little things that make you
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feel at home in an otherwise utterly useless piece of code. They're
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what make an obfuscation work.
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While the program source of course depends highly on #defines for
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obfuscation, I like to think that this code has those little touches,
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those professionally sharpened edges that mark true software
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engineering. Observe, for instance, how i and s are the string and
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integer stacks respectively. It's these little things that make you
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feel at home in an otherwise utterly useless piece of code. They're
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what make an obfuscation work.
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The character pool (``I'' after cpp) makes it rather painful to
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see the effect of commands at a glance. I can just imagine people
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spending hours bouncing between the pool and the rest of the code,
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or accidentally changing the pool without realizing its importance.
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Without documentation and example scripts, someone would find it
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a challenge to figure out what the arrays are used for, let alone
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that SORTA is a scripting language.
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The character pool (``I'' after cpp) makes it rather painful to
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see the effect of commands at a glance. I can just imagine people
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spending hours bouncing between the pool and the rest of the code,
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or accidentally changing the pool without realizing its importance.
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Without documentation and example scripts, someone would find it
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a challenge to figure out what the arrays are used for, let alone
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that SORTA is a scripting language.
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Another nice feature is that the SORTA language itself encourages
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you to write not merely obfuscated but plain incomprehensible
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scripts (like the examples below---after working with the language
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for a while, I guess I can read it pretty easily, but I also think
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FORTH is a beautiful language). The numbers running around
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everywhere will make people think of ASCII, even though the code is
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not ASCII-dependent. What's your first thought when you see
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several arrays[256]? This is pretty standard obfuscation otherwise.
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I like the way that unbalanced macro braces can throw off the
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reader in ``if(c>0){y+1]=z[c];'', and I had fun covering the
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alphabet with #defines, but that's nothing special.
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Another nice feature is that the SORTA language itself encourages
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you to write not merely obfuscated but plain incomprehensible
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scripts (like the examples below---after working with the language
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for a while, I guess I can read it pretty easily, but I also think
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FORTH is a beautiful language). The numbers running around
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everywhere will make people think of ASCII, even though the code is
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not ASCII-dependent. What's your first thought when you see
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several arrays[256]? This is pretty standard obfuscation otherwise.
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I like the way that unbalanced macro braces can throw off the
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reader in ``if(c>0){y+1]=z[c];'', and I had fun covering the
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alphabet with #defines, but that's nothing special.
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Possible future extensions to SORTA include string extraction and
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matching, reading from files into strings, and encrypting the string
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pool to further confuse the judges. I don't think I can fit this into
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the size limit, unfortunately.
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Possible future extensions to SORTA include string extraction and
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matching, reading from files into strings, and encrypting the string
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pool to further confuse the judges. I don't think I can fit this into
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the size limit, unfortunately.
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Copyright (c) 1991, Landon Curt Noll & Larry Bassel.
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All Rights Reserved. Permission for personal, educational or non-profit use is
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@@ -33,10 +33,10 @@ f(c>='0'&&c<='9'){f(!n)N=0;n=1;e=10*e+(c-'0')h}n=0;J(39,m
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sprintf(d=M(13),"%d",e))
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J(37,q&&puts(g))J(34,q&&printf("%s",g))J(27,H(p,_,s))O('[',']')J(56,f(p){c=e;N=c;})J(2,m--p)J(10,N=a)J(4,f(q){N=L(g);X(S--]);})J(1,f(q){S+1]=T(g);++q;})J(53,m
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e>=0&&e<a&&(d=T(A[u])))
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J(54,q>1&&(--q,U(S+1],i+q)))J(5,q&&p>1&&(_-1]=open(g,_-1],e),--p,X(S--])))J(47,m
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J(54,q>1&&(--q,U(S+1],i+q)))J(5,q&&p>1&&(_-1]=open(g,_-1],e),--p,X(S--]),1))J(47,m
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close(u))
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J(26,m(e=dup(e)))O('"','"')J(51,H(q,S,i))J(49,N=fork())J(12,wait(&N)+1||(e=-1))J(68,{++p;pipe(s+p++)==-1&&(e=-1);})F('q',v
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0)
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F('=',W{R x;f(m u)f(x=l){k+=n=L(x);V;Y(*x)K[--k]=*x++;k+=n;n=0;}b})J(15,f(q)W{l&&X(l);l=T(g);b})J(33,f(c=q){*i=g;g=0;Y(--q&&**(i+q))g++;f(q){N=execvp(*i,i+q+1);q=c;}})J(38,P
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c&&(e/C))
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J(35,Q=e>G)F('+',Q+C)J(42,Q*C)J(41,Q=~(e&G))J(57,m(e=-e))J(3,)F('\n',)putchar(c);puts(73+I);}}
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F('=',W{R x;f(m u)f(x=l){k+=n=L(x);V;Y(*x)K[--k]=*x++;k+=n;n=0;}b})J(15,f(q)W{l&&(X(l),1);l=T(g);b})J(33,f(c=q){*i=g;g=0;Y(--q&&**(i+q))g++;f(q){N=execvp(*i,i+q+1);q=c;}})J(38,P
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c&&(e/=G))
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J(35,Q=e>G)F('+',Q+=G)J(42,Q*=G)J(41,Q=~(e&G))J(57,m(e=-e))J(3,)F('\n',)putchar(c);puts(73+I);}}
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