[ruby-core:104858] [Ruby master Bug#18074] ARGF.read(length) exhibits short rea

Issue #18074 has been updated by csabahenk2 (Csaba Henk).


Proposed fix: https://github.com/ruby/ruby/pull/4727

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Bug #18074: ARGF.read(length) exhibits short rea
https://bugs.ruby-lang.org/issues/18074#change-93206

* Author: csabahenk2 (Csaba Henk)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-08-04T09:29:42Z master 6e55facdb3) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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If ruby is invoked with three file name arguments (which refer to extant non-empty regular files), and `ARFG.read` is called with a length argument that exceeds the combined size of the first two files[1], then only the content of the first two files will be collected in the resultant string.

``` shell
$ for f in a b c; do echo -n $f > $f; done
$ ruby -e 'p ARGF.read(3)' a b c
"ab"
```

[1]: This is actually just a necessary condition, the exact criteria will be provided in followup analysis. 



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