Re: ⎕FIO Buffer limit is 5000 Bytes

[Kacper Gutowski]

On Thu, Oct 29, 2020 at 10:22:52PM +0100, Hans-Peter Sorge wrote:
> the return size from ⎕FIO[24] / ⎕FIO[6] is limited to 5000B:
(...)
> Should be: What ever it takes :-)

It's not limited to 5000B, it's just the default size and you can use 
any other with dyadic form.  ⎕FIO is fairly low-level and has very few 
convenience wrappers like ⎕FIO[26].  Perhaps one doing popen and reading 
the whole output like Perl's `` would be in order too, but it definitely 
shouldn't be what ⎕FIO[6] does.

You can relatively easily do something like this:

    ∇ bytes←read_to_eof fd ;buf
[1]   bytes←0⍴0
[2]  loop:
[3]  →(⎕FIO['feof'] fd)/0
[4]   buf←⎕FIO['fread'] fd
[5]  →(0≡buf)/loop
[6]   ⎕ES(1≠⍴⍴buf)/⎕FIO['strerror'] buf
[7]   bytes←bytes,buf
[8]  →loop
    ∇

(It could be a one-liner if API were designed a bit better, 
but it's still workable.)

-k