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Groups > comp.os.linux.advocacy > #456421

Re: linking sc to libgmp

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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.  :)

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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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