From: usa@...
Date: 2016-09-12T06:59:05+00:00
Subject: [ruby-dev:49798] [Ruby trunk Bug#12754] Want to use prepared buffer	with `Array#pack`

Issue #12754 has been reported by Usaku NAKAMURA.

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Bug #12754: Want to use prepared buffer with `Array#pack`
https://bugs.ruby-lang.org/issues/12754

* Author: Usaku NAKAMURA
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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`Array#pack` always returns new allocated `String`, but sometimes users want to use prepared buffer, especially the packed size is too large.
I often uses `Fiddle` to call OS APIs, and encounter this problem as every time.
I recommend to add keyword arguments for the purpose.

```ruby
buf = '\0'*(32 * 1024 * 1024)
# ...
ary.pack(LONG_FORMAT, buffer: buf, offset: 4 * 1024) # returns `buf`
```




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