LYSP (a really tiny lisp)

#1

Post by jacquesm » Thu, Oct 01, 2009, 9:24 PM UTC

Re: LYSP (a really tiny lisp)

#2

Post by yan » Thu, Oct 01, 2009, 10:41 PM UTC

God, seeing straight C programs that don't use any superfluous libraries or stupid coding tricks that just obscure the intent of the programmer is so refreshing. Just one C file that anyone with a barely working knowledge of C can understand and a very clear Lisp implementation.

Just don't try to learn C from it; code is saturated with boundless copying into stack buffers.

Re: LYSP (a really tiny lisp)

#3

Post by avibryant » Thu, Oct 01, 2009, 10:56 PM UTC

I smiled at the last two lines of his test file:

(define exit (dlsym "exit")) (exit 0)

Certainly no need to define exit any earlier than that...

Re: LYSP (a really tiny lisp)

#4

Post by jwecker » Thu, Oct 01, 2009, 11:18 PM UTC

I've used this library a few times for similar (not as good and not good enough to show off) fun- it works beautifully: http://sexpr.sourceforge.net

Re: LYSP (a really tiny lisp)

#5

Post by brianobush » Thu, Oct 01, 2009, 11:36 PM UTC

the ifdef'd main in gc.c has bit rot a bit and segfaults, otherwise nice and simple.

Re: LYSP (a really tiny lisp)

#6

Post by z8000 » Fri, Oct 02, 2009, 1:09 AM UTC

I know only the very basics of LISP but this to my untrained eye looks rather neat!

Re: LYSP (a really tiny lisp)

#7

Post by capablanca » Fri, Oct 02, 2009, 1:48 AM UTC

Ugh, why software rottens?

Re: LYSP (a really tiny lisp)

#8

Post by mahmud » Fri, Oct 02, 2009, 1:51 AM UTC

yan wrote: post #2

God, seeing straight C programs that don't use any superfluous libraries or stupid coding tricks that just obscure the intent of the programmer is so refreshing. Just one C file that anyone with a barely working knowledge of C can understand and a very clear Lisp implementation. Just don't try to learn C from it; code is saturated with boundless copying into stack buffers.

check this one out :-D

http://www.modeemi.fi/~chery/lisp500/lisp500c99.c

Re: LYSP (a really tiny lisp)

#9

Post by jacquesm » Fri, Oct 02, 2009, 2:03 AM UTC

mahmud wrote: post #8

yan wrote: post #2

God, seeing straight C programs that don't use any superfluous libraries or stupid coding tricks that just obscure the intent of the programmer is so refreshing. Just one C file that anyone with a barely working knowledge of C can understand and a very clear Lisp implementation. Just don't try to learn C from it; code is saturated with boundless copying into stack buffers.

check this one out :-D http://www.modeemi.fi/~chery/lisp500/lisp500c99.c

Somewhere in there there is a really nice prank with a novice programmer and a one letter change.

Re: LYSP (a really tiny lisp)

#10

Post by yan » Fri, Oct 02, 2009, 2:05 AM UTC

mahmud wrote: post #8

yan wrote: post #2

God, seeing straight C programs that don't use any superfluous libraries or stupid coding tricks that just obscure the intent of the programmer is so refreshing. Just one C file that anyone with a barely working knowledge of C can understand and a very clear Lisp implementation. Just don't try to learn C from it; code is saturated with boundless copying into stack buffers.

check this one out :-D http://www.modeemi.fi/~chery/lisp500/lisp500c99.c

Is that an IOCCC entry?

Off topic: are you still in the NOVA area or overseas?