1//===-- Unittests for fgetc -----------------------------------------------===//
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/clearerr.h"
10#include "src/stdio/fclose.h"
11#include "src/stdio/feof.h"
12#include "src/stdio/ferror.h"
13#include "src/stdio/fgetc.h"
14#include "src/stdio/fopen.h"
15#include "src/stdio/fwrite.h"
16#include "src/stdio/getc.h"
17#include "test/UnitTest/ErrnoCheckingTest.h"
18#include "test/UnitTest/ErrnoSetterMatcher.h"
19#include "test/UnitTest/Test.h"
20
21#include "hdr/stdio_macros.h"
22
23using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
24
25class LlvmLibcGetcTest : public LIBC_NAMESPACE::testing::ErrnoCheckingTest {
26public:
27 using GetcFunc = int(FILE *);
28 void test_with_func(GetcFunc *func, const char *filename) {
29 ::FILE *file = LIBC_NAMESPACE::fopen(filename, "w");
30 ASSERT_FALSE(file == nullptr);
31 constexpr char CONTENT[] = "123456789";
32 constexpr size_t WRITE_SIZE = sizeof(CONTENT) - 1;
33 ASSERT_THAT(LIBC_NAMESPACE::fwrite(CONTENT, 1, WRITE_SIZE, file),
34 Succeeds(WRITE_SIZE));
35 // This is a write-only file so reads should fail.
36 ASSERT_THAT(func(file), Fails(EBADF, EOF));
37 // This is an error and not a real EOF.
38 ASSERT_EQ(LIBC_NAMESPACE::feof(file), 0);
39 ASSERT_NE(LIBC_NAMESPACE::ferror(file), 0);
40
41 ASSERT_THAT(LIBC_NAMESPACE::fclose(file), Succeeds());
42
43 file = LIBC_NAMESPACE::fopen(filename, "r");
44 ASSERT_FALSE(file == nullptr);
45
46 for (size_t i = 0; i < WRITE_SIZE; ++i) {
47 ASSERT_THAT(func(file), Succeeds(int('1' + i)));
48 }
49 // Reading more should return EOF but not set error.
50 ASSERT_THAT(func(file), Succeeds(EOF));
51 ASSERT_NE(LIBC_NAMESPACE::feof(file), 0);
52 ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
53
54 ASSERT_THAT(LIBC_NAMESPACE::fclose(file), Succeeds());
55 }
56};
57
58TEST_F(LlvmLibcGetcTest, WriteAndReadCharactersWithFgetc) {
59 test_with_func(&LIBC_NAMESPACE::fgetc, "testdata/fgetc.test");
60}
61
62TEST_F(LlvmLibcGetcTest, WriteAndReadCharactersWithGetc) {
63 test_with_func(&LIBC_NAMESPACE::getc, "testdata/getc.test");
64}
65

source code of libc/test/src/stdio/fgetc_test.cpp