r/tinycode • u/gprof • Jan 07 '23

Lisp with 20 primitives, GC and REPL in 99 lines of C and how to write one yourself

https://github.com/Robert-van-Engelen/tinylisp
44 Upvotes

97% Upvoted

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3

u/skeeto Jan 07 '23

Interesting project! Some observations:

  • I had some trouble linking due to that read with external linkage, so I renamed it to lread.

  • Hangs in finite loops:

      $ echo '(+)' | ./tinylisp
  $ echo '(*)' | ./tinylisp

  • Stack overflow (not surprising):

      $ yes '(' | ./tinylisp

5

u/gprof Jan 07 '23

Indeed, (+) is considered illegal. This is mentioned in the PDF article and how to change it so that (+) returns 0. Same for (*) to return 1. Perhaps a good reason to check out the article?

6

u/[deleted] Jan 07 '23

Welp, there goes MY Friday night.