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 "src/stdio/fclose.h"
10 #include "src/stdio/fopen.h"
11 #include "src/stdio/fread.h"
12 #include "src/stdio/fwrite.h"
13 #include "src/stdio/setbuf.h"
14 #include "src/stdio/ungetc.h"
15 #include "test/UnitTest/Test.h"
16
17 #include <stdio.h>
18
TEST(LlvmLibcSetbufTest,DefaultBufsize)19 TEST(LlvmLibcSetbufTest, DefaultBufsize) {
20 // The idea in this test is to change the buffer after opening a file and
21 // ensure that read and write work as expected.
22 constexpr char FILENAME[] = "testdata/setbuf_test_default_bufsize.test";
23 ::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
24 ASSERT_FALSE(file == nullptr);
25 char buffer[BUFSIZ];
26 LIBC_NAMESPACE::setbuf(file, buffer);
27 constexpr char CONTENT[] = "abcdef";
28 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
29 ASSERT_EQ(CONTENT_SIZE,
30 LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
31 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
32
33 file = LIBC_NAMESPACE::fopen(FILENAME, "r");
34 LIBC_NAMESPACE::setbuf(file, buffer);
35 ASSERT_FALSE(file == nullptr);
36 char data[CONTENT_SIZE];
37 ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
38 ASSERT_STREQ(CONTENT, data);
39 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
40 }
41
TEST(LlvmLibcSetbufTest,NullBuffer)42 TEST(LlvmLibcSetbufTest, NullBuffer) {
43 // The idea in this test is that we set a null buffer and ensure that
44 // everything works correctly.
45 constexpr char FILENAME[] = "testdata/setbuf_test_null_buffer.test";
46 ::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
47 ASSERT_FALSE(file == nullptr);
48 LIBC_NAMESPACE::setbuf(file, nullptr);
49 constexpr char CONTENT[] = "abcdef";
50 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
51 ASSERT_EQ(CONTENT_SIZE,
52 LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
53 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
54
55 file = LIBC_NAMESPACE::fopen(FILENAME, "r");
56 LIBC_NAMESPACE::setbuf(file, nullptr);
57 ASSERT_FALSE(file == nullptr);
58 char data[CONTENT_SIZE];
59 ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
60 ASSERT_STREQ(CONTENT, data);
61
62 // Ensure that ungetc also works.
63 char unget_char = 'z';
64 ASSERT_EQ(int(unget_char), LIBC_NAMESPACE::ungetc(unget_char, file));
65 char c;
66 ASSERT_EQ(LIBC_NAMESPACE::fread(&c, 1, 1, file), size_t(1));
67 ASSERT_EQ(c, unget_char);
68
69 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
70 }
71