blob: 8201ad47ca1fcf19dd07656809655a3cc81b160a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO#sysread on a file" do
before :each do
@file_name = tmp("IO_sysread_file") + $$.to_s
File.open(@file_name, "w") do |f|
# write some stuff
f.write("012345678901234567890123456789")
end
@file = File.open(@file_name, "r+")
end
after :each do
@file.close
rm_r @file_name
end
it "reads the specified number of bytes from the file" do
@file.sysread(15).should == "012345678901234"
end
it "reads the specified number of bytes from the file to the buffer" do
buf = "" # empty buffer
@file.sysread(15, buf).should == buf
buf.should == "012345678901234"
@file.rewind
buf = "ABCDE" # small buffer
@file.sysread(15, buf).should == buf
buf.should == "012345678901234"
@file.rewind
buf = "ABCDE" * 5 # large buffer
@file.sysread(15, buf).should == buf
buf.should == "012345678901234"
end
it "coerces the second argument to string and uses it as a buffer" do
buf = "ABCDE"
(obj = mock("buff")).should_receive(:to_str).any_number_of_times.and_return(buf)
@file.sysread(15, obj).should == buf
buf.should == "012345678901234"
end
it "advances the position of the file by the specified number of bytes" do
@file.sysread(15)
@file.sysread(5).should == "56789"
end
it "raises an error when called after buffered reads" do
@file.readline
-> { @file.sysread(5) }.should raise_error(IOError)
end
it "reads normally even when called immediately after a buffered IO#read" do
@file.read(15)
@file.sysread(5).should == "56789"
end
it "does not raise error if called after IO#read followed by IO#write" do
@file.read(5)
@file.write("abcde")
-> { @file.sysread(5) }.should_not raise_error(IOError)
end
it "does not raise error if called after IO#read followed by IO#syswrite" do
@file.read(5)
@file.syswrite("abcde")
-> { @file.sysread(5) }.should_not raise_error(IOError)
end
it "reads updated content after the flushed buffered IO#write" do
@file.write("abcde")
@file.flush
@file.sysread(5).should == "56789"
File.open(@file_name) do |f|
f.sysread(10).should == "abcde56789"
end
end
it "raises IOError on closed stream" do
-> { IOSpecs.closed_io.sysread(5) }.should raise_error(IOError)
end
end
describe "IO#sysread" do
before do
@read, @write = IO.pipe
end
after do
@read.close
@write.close
end
it "returns a smaller string if less than size bytes are available" do
@write.syswrite "ab"
@read.sysread(3).should == "ab"
end
end
|
