Yukihiro "Matz" Matsumoto 8627157298 Fix IO#readchar to return broken UTF-8 rather than EOF error. ...

The behavior is different from CRuby, but we believe this is a right
behavior for mruby, which only supports either ASCII or UTF-8
exclusively; fix #4983, ref #4982

```
$ printf '\xe3\x81' | ruby -e 'p STDIN.readchar'
"\xE3\x81"
```

```
$ printf '\xe3\x81' | mruby -e 'p STDIN.readchar'
"\xE3"
```

2020-04-28 18:07:17 +09:00

..

file_constants.rb

Support bit flags for IO.open

2019-12-14 15:19:13 +09:00

file.rb

Avoid method in method

2019-12-14 15:04:56 +09:00

io.rb

Fix IO#readchar to return broken UTF-8 rather than EOF error.

2020-04-28 18:07:17 +09:00

kernel.rb

Remove Kernel#getc

2019-10-21 18:50:52 +09:00