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Groups > comp.os.linux.advocacy > #456424

Re: linking sc to libgmp

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Steve Carroll <fretwizzer@gmail.com> wrote:
> On Monday, June 25, 2018 at 3:20:02 PM UTC-6, owl wrote:
>> Steve Carroll <fretwizzer@gmail.com> wrote:
>> > On Monday, June 25, 2018 at 8:55:24 AM UTC-6, owl wrote:
>> >> Finally figured out how to create a built-in arbitrary precision
>> >> addition function for sc.  This first attempt simply adds two cells.
>> >> 
>> >> https://pewtube.com/user/owl/pdscsXX?autoplay=off
>> >> 
>> >> Because sc's internal floating-point representation is a double, and
>> >> therefore limited to that precision, the numbers for arbitrary precision
>> >> math must entered as strings, with the function returning a string.
>> >> 
>> >> The function itself was easy enough, but figuring out how to get
>> >> sc to save it took a lot of digging through the code. 
>> > 
>> > Why?
>> > 
>> 
>> Because it was buried in a non-obvious (to me) place.  The code that
>> causes the function to appear in the info line at the top when the
>> cursor is over a cell containing a function, as in the image below where
>> it shows:
>> 
>> A2 (78 2 0) <{@sadd(A0,A1)}
>> 
>> https://imgur.com/a/Z9f2Fsz
>> 
>> is also responsible for having the function written to a saved file.
>> This is the code (in interp.c):
>> 
>> void
>> decompile(register struct enode *e, int priority)
>> {
>>     register char *s;
>>     if (e) {
>>         int mypriority;
>>         switch (e->op) {
>> ...
>>          case SADD:      two_arg("@sadd(", e); break;
>> ...
>> }
>> 
>> Without that case statement, the function, even though working correctly,
>> displays as:
>> 
>> A2 (78 2 0) <{A0M(A1)}
>> 
>> and is written to a saved file as:
>> 
>> leftstring A2 = AOM(A1) 
>> 
>> When written that way, the function of course does not work when the file
>> is reloaded.  After adding that case statement, the function gets properly 
>> displayed as
>> 
>> A2 (78 2 0) <{@sadd(A0,A1)}
>> 
>> and written to the file as:
>> 
>> leftstring A2 = @sadd(A0,A1)
>> 
>> And now it works.  :)
> 
> This doesn't strictly apply here but it's always fun with no errors thrown 
> where you wish they would be if that thing is going to end up being the 
> eventual culprit. Yours is a bizarre situation but it's one of those little
> 'learning experiences' you treasure... until you forget it next time.

The main difficulty here was that the text is in a variable called "line"
(:O) that is printed by an ncurses function addstr() that is called by the
update() function in screen.c, and I could not for the life of me find
where it was supposed to be getting the correct string.  I ran tests
an was able append to it manually, but that was it.  Basically, it's
just a pain in the ass trying to navigate somebody else's complex code.

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Thread

linking sc to libgmp owl <owl@rooftop.invalid> - 2018-06-25 14:55 +0000
  Re: linking sc to libgmp Steve Carroll <fretwizzer@gmail.com> - 2018-06-25 13:10 -0700
    Re: linking sc to libgmp owl <owl@rooftop.invalid> - 2018-06-25 21:20 +0000
      Re: linking sc to libgmp Steve Carroll <fretwizzer@gmail.com> - 2018-06-25 14:33 -0700
        Re: linking sc to libgmp owl <owl@rooftop.invalid> - 2018-06-25 21:48 +0000
          Re: linking sc to libgmp Steve Carroll <fretwizzer@gmail.com> - 2018-06-25 14:56 -0700
            Re: linking sc to libgmp owl <owl@rooftop.invalid> - 2018-06-25 22:17 +0000
              Re: linking sc to libgmp Steve Carroll <fretwizzer@gmail.com> - 2018-06-25 15:23 -0700
                Re: linking sc to libgmp owl <owl@rooftop.invalid> - 2018-06-25 22:48 +0000
                Re: linking sc to libgmp Steve Carroll <fretwizzer@gmail.com> - 2018-06-26 08:11 -0700

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