Fix mruby-io - #4712
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`IO#readline` and `IO#readchar` process in character units.
Character (multi-byte UTF-8) is destroyed when character spanning
`IO::BUF_SIZE` (4096 bytes) exist.
- Prepare file:
```ruby
File.open("sample", "wb") { |f| f << "●" * 1370 }
```
- Before patched:
```ruby
File.open("sample") { |f| a = []; while ch = f.getc; a << ch; end; p a }
# => ["●", "●", ..., "●", "\xe2", "\x97", "\x8f", "●", "●", "●", "●"]
- After patched:
```ruby
File.open("sample") { |f| a = []; while ch = f.getc; a << ch; end; p a }
# => ["●", "●", ..., "●", "●", "●", "●", "●", "●"]
matz
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matz
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- mrb_utf8len() - returns the size of a UTF-8 char (in bytes) - mrb_utf8_strlen() - returns the length of a UTF-8 string (in char)
matz
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This fix only effective when `MRB_UTF8_STRING` is set.
mimaki
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The bug was introduced by mruby#4712. The `getc' problem resurrected. It should be addressed soon.
mimaki
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- mrb_utf8len() - returns the size of a UTF-8 char (in bytes) - mrb_utf8_strlen() - returns the length of a UTF-8 string (in char)
mimaki
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This fix only effective when `MRB_UTF8_STRING` is set.
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"Fix broken UTF-8 characters by
IO#getc" (992ba47) increases the object code size withoutMRB_UTF8_STRINGtoo, so I would like to improve if there is a better solution (but no idea).