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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/write'
describe "IO#syswrite on a file" do
before :each do
@filename = tmp("IO_syswrite_file") + $$.to_s
File.open(@filename, "w") do |file|
file.syswrite("012345678901234567890123456789")
end
@file = File.open(@filename, "r+")
@readonly_file = File.open(@filename)
end
after :each do
@file.close
@readonly_file.close
rm_r @filename
end
it "writes all of the string's bytes but does not buffer them" do
written = @file.syswrite("abcde")
written.should == 5
File.open(@filename) do |file|
file.sysread(10).should == "abcde56789"
file.seek(0)
@file.fsync
file.sysread(10).should == "abcde56789"
end
end
it "does not modify the passed argument" do
File.open(@filename, "w") do |f|
f.set_encoding(Encoding::IBM437)
# A character whose codepoint differs between UTF-8 and IBM437
f.syswrite("ƒ".freeze)
end
File.binread(@filename).bytes.should == [198, 146]
end
it "warns if called immediately after a buffered IO#write" do
@file.write("abcde")
-> { @file.syswrite("fghij") }.should complain(/syswrite/)
end
it "does not warn if called after IO#write with intervening IO#sysread" do
@file.syswrite("abcde")
@file.sysread(5)
-> { @file.syswrite("fghij") }.should_not complain
end
it "writes to the actual file position when called after buffered IO#read" do
@file.read(5)
@file.syswrite("abcde")
File.open(@filename) do |file|
file.sysread(10).should == "01234abcde"
end
end
end
describe "IO#syswrite on a pipe" do
it "returns the written bytes if the fd is in nonblock mode and write would block" do
require 'io/nonblock'
r, w = IO.pipe
begin
w.nonblock = true
larger_than_pipe_capacity = 2 * 1024 * 1024
written = w.syswrite("a"*larger_than_pipe_capacity)
written.should > 0
written.should < larger_than_pipe_capacity
ensure
w.close
r.close
end
end
end
describe "IO#syswrite" do
it_behaves_like :io_write, :syswrite
it_behaves_like :io_write_no_transcode, :syswrite
end
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