1 //===-- Unittests for setbuf ----------------------------------------------===//
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 "hdr/stdio_macros.h"
10 #include "src/stdio/fclose.h"
11 #include "src/stdio/fopen.h"
12 #include "src/stdio/fread.h"
13 #include "src/stdio/fwrite.h"
14 #include "src/stdio/setbuf.h"
15 #include "src/stdio/ungetc.h"
16 #include "test/UnitTest/Test.h"
17
TEST(LlvmLibcSetbufTest,DefaultBufsize)18 TEST(LlvmLibcSetbufTest, DefaultBufsize) {
19 // The idea in this test is to change the buffer after opening a file and
20 // ensure that read and write work as expected.
21 constexpr char FILENAME[] = "testdata/setbuf_test_default_bufsize.test";
22 ::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
23 ASSERT_FALSE(file == nullptr);
24 char buffer[BUFSIZ];
25 LIBC_NAMESPACE::setbuf(file, buffer);
26 constexpr char CONTENT[] = "abcdef";
27 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
28 ASSERT_EQ(CONTENT_SIZE,
29 LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
30 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
31
32 file = LIBC_NAMESPACE::fopen(FILENAME, "r");
33 LIBC_NAMESPACE::setbuf(file, buffer);
34 ASSERT_FALSE(file == nullptr);
35 char data[CONTENT_SIZE];
36 ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
37 ASSERT_STREQ(CONTENT, data);
38 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
39 }
40
TEST(LlvmLibcSetbufTest,NullBuffer)41 TEST(LlvmLibcSetbufTest, NullBuffer) {
42 // The idea in this test is that we set a null buffer and ensure that
43 // everything works correctly.
44 constexpr char FILENAME[] = "testdata/setbuf_test_null_buffer.test";
45 ::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
46 ASSERT_FALSE(file == nullptr);
47 LIBC_NAMESPACE::setbuf(file, nullptr);
48 constexpr char CONTENT[] = "abcdef";
49 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
50 ASSERT_EQ(CONTENT_SIZE,
51 LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
52 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
53
54 file = LIBC_NAMESPACE::fopen(FILENAME, "r");
55 LIBC_NAMESPACE::setbuf(file, nullptr);
56 ASSERT_FALSE(file == nullptr);
57 char data[CONTENT_SIZE];
58 ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
59 ASSERT_STREQ(CONTENT, data);
60
61 // Ensure that ungetc also works.
62 char unget_char = 'z';
63 ASSERT_EQ(int(unget_char), LIBC_NAMESPACE::ungetc(unget_char, file));
64 char c;
65 ASSERT_EQ(LIBC_NAMESPACE::fread(&c, 1, 1, file), size_t(1));
66 ASSERT_EQ(c, unget_char);
67
68 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
69 }
70