Hi,
As already pointed out by Kacper, ⎕FIO[6] is intended to be used
multiple times and every monadic call will give you 5000 bytes (or less
at the end of the file). Thr dyadic form lets you control the buffer
size (instead
of 5000). If tou set it to, say, 100 Giga then wou will most likely
get the entire
file (or WS FULL if the file is that large),
There is also ⎕FIO[26] which reads an entire file, but I am not sure
how it
works with popen()ed streams. All ⎕FIO functions try to work without
unnecessary copies of the file contents, that's why you need to specify
the buffer size beforehand.
Best Regards,
Jürgen
On 10/30/20 1:25 PM, Kacper Gutowski wrote:
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