Backport #5207: StringIO#read(length,nil) does not behave in the same way as IO#read

• Status: Rejected
• Assignee: yugui (Yuki Sonoda)

[postmodern (Hal Brodigan)]

I noticed an incompatibility between IO#read(length,buffer) and StringIO#read, when buffer is nil.

file = File.read('test')
file.read(2,nil)
# => "12"

string = StringIO.new("hello")
string.read(2,nil)
TypeError: can't convert nil into String
from (irb):3:in `read'
from (irb):3
from /home/hal/.rvm/rubies/ruby-1.9.3-preview1/bin/irb:16:in `<main>'

Effects both 1.9.2-p290 and 1.9.3-preview1.

[postmodern (Hal Brodigan)]

Oops, that should be:

file = File.new('test')
file.read(2,nil)
# => "12"

require 'stringio'
stringio = StringIO.new("hello")
stringio.read(2,nil)
TypeError: can't convert nil into String
  from (irb):3:in `read'
  from (irb):3 from /home/hal/.rvm/rubies/ruby-1.9.3-preview1/bin/irb:16:in `<main>' 

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r33010.
Hal, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• ext/stringio/stringio.c (strio_read): return new string if nil
  is explicitly given as a buffer ([Bug #5207]), otherwise set the
  encoding. also removed dead code.

[nobu (Nobuyoshi Nakada)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport192
• Category changed from lib to lib
• Status changed from Closed to Assigned
• Assignee set to yugui (Yuki Sonoda)
• Target version deleted (1.9.3)

[naruse (Yui NARUSE)]

• Status changed from Assigned to Rejected