[ruby-core:91235] [Ruby trunk Feature#15560] Add support for read/write offsets.

[ruby-core:91235] [Ruby trunk Feature#15560] Add support for read/write offsets.

[samuel]

Issue #15560 has been reported by ioquatix (Samuel Williams).

----------------------------------------
Feature #15560: Add support for read/write offsets.
https://bugs.ruby-lang.org/issues/15560

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
It would be nice if read/write/send/recv/etc methods could accept an offset argument.

e.g.

```
socket = Socket.new(...)
buffer = String.b

socket.read(1024, buffer)
socket.read(1024, buffer, offset: buffer.bytesize)
```

The same for write, e.g.

```
socket = Socket.new(...)
buffer = String.b

amount = socket.write(buffer)
socket.write(buffer, offset: amount)
```

Could also include "size:" so that we can selectively write parts of the buffer.



-- 
https://bugs.ruby-lang.org/

[ruby-core:91239] [Ruby trunk Feature#15560] Add support for read/write offsets.

[shyouhei]

Issue #15560 has been updated by shyouhei (Shyouhei Urabe).


I can imagine it is useful for TCPSocket#write to accept only a part of a buffer crafted by somebody else.  But I cannot think of any actual use case when #read is useful with that extension.  Do you have one?

----------------------------------------
Feature #15560: Add support for read/write offsets.
https://bugs.ruby-lang.org/issues/15560#change-76484

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
It would be nice if read/write/send/recv/etc methods could accept an offset argument.

e.g.

```
socket = Socket.new(...)
buffer = String.b

socket.read(1024, buffer)
socket.read(1024, buffer, offset: buffer.bytesize)
```

The same for write, e.g.

```
socket = Socket.new(...)
buffer = String.b

amount = socket.write(buffer)
socket.write(buffer, offset: amount)
```

Could also include "size:" so that we can selectively write parts of the buffer.



-- 
https://bugs.ruby-lang.org/

[ruby-core:91274] [Ruby trunk Feature#15560] Add support for read/write offsets.

[samuel]

Issue #15560 has been updated by ioquatix (Samuel Williams).


It is useful for read when user wants to read some data, and it wasn't enough (e.g. implementing `gets`) so you need to read some more at the end of what you already have.

----------------------------------------
Feature #15560: Add support for read/write offsets.
https://bugs.ruby-lang.org/issues/15560#change-76521

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
It would be nice if read/write/send/recv/etc methods could accept an offset argument.

e.g.

```
socket = Socket.new(...)
buffer = String.b

socket.read(1024, buffer)
socket.read(1024, buffer, offset: buffer.bytesize)
```

The same for write, e.g.

```
socket = Socket.new(...)
buffer = String.b

amount = socket.write(buffer)
socket.write(buffer, offset: amount)
```

Could also include "size:" so that we can selectively write parts of the buffer.



-- 
https://bugs.ruby-lang.org/

[ruby-core:91279] [Ruby trunk Feature#15560] Add support for read/write offsets.

[samuel]

Issue #15560 has been updated by ioquatix (Samuel Williams).


Also, rather than using a keyword argument, it could be a 3rd argument after buffer, since buffer must be supplied in order for this to work.

----------------------------------------
Feature #15560: Add support for read/write offsets.
https://bugs.ruby-lang.org/issues/15560#change-76525

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
It would be nice if read/write/send/recv/etc methods could accept an offset argument.

e.g.

```
socket = Socket.new(...)
buffer = String.b

socket.read(1024, buffer)
socket.read(1024, buffer, offset: buffer.bytesize)
```

The same for write, e.g.

```
socket = Socket.new(...)
buffer = String.b

amount = socket.write(buffer)
socket.write(buffer, offset: amount)
```

Could also include "size:" so that we can selectively write parts of the buffer.



-- 
https://bugs.ruby-lang.org/

[ruby-core:91290] Re: [Ruby trunk Feature#15560] Add support for read/write offsets.

[Eric Wong]

> Feature #15560: Add support for read/write offsets.
> https://bugs.ruby-lang.org/issues/15560

Fwiw, Perl5 has had these features since forever and they're
immensely useful for non-blocking I/O.

> Could also include "size:" so that we can selectively write parts of the buffer.

Yes, perl's syswrite and IO::Handle->write has this, too.