1 //===- llvm/unittest/Support/raw_fd_stream_test.cpp - raw_fd_stream tests -===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/ADT/SmallString.h"
10 #include "llvm/Config/llvm-config.h"
11 #include "llvm/Support/Casting.h"
12 #include "llvm/Support/FileSystem.h"
13 #include "llvm/Support/FileUtilities.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include "gtest/gtest.h"
16 
17 using namespace llvm;
18 
19 namespace {
20 
21 TEST(raw_fd_streamTest, ReadAfterWrite) {
22   SmallString<64> Path;
23   int FD;
24   ASSERT_FALSE(sys::fs::createTemporaryFile("foo", "bar", FD, Path));
25   FileRemover Cleanup(Path);
26   std::error_code EC;
27   raw_fd_stream OS(Path, EC);
28   EXPECT_TRUE(!EC);
29 
30   char Bytes[8];
31 
32   OS.write("01234567", 8);
33 
34   OS.seek(3);
35   EXPECT_EQ(OS.read(Bytes, 2), 2);
36   EXPECT_EQ(Bytes[0], '3');
37   EXPECT_EQ(Bytes[1], '4');
38 
39   OS.seek(4);
40   OS.write("xyz", 3);
41 
42   OS.seek(0);
43   EXPECT_EQ(OS.read(Bytes, 8), 8);
44   EXPECT_EQ(Bytes[0], '0');
45   EXPECT_EQ(Bytes[1], '1');
46   EXPECT_EQ(Bytes[2], '2');
47   EXPECT_EQ(Bytes[3], '3');
48   EXPECT_EQ(Bytes[4], 'x');
49   EXPECT_EQ(Bytes[5], 'y');
50   EXPECT_EQ(Bytes[6], 'z');
51   EXPECT_EQ(Bytes[7], '7');
52 }
53 
54 TEST(raw_fd_streamTest, DynCast) {
55   {
56     std::error_code EC;
57     raw_fd_stream OS("-", EC);
58     EXPECT_TRUE(dyn_cast<raw_fd_stream>(&OS));
59   }
60   {
61     std::error_code EC;
62     raw_fd_ostream OS("-", EC);
63     EXPECT_FALSE(dyn_cast<raw_fd_stream>(&OS));
64   }
65 }
66 
67 } // namespace
68