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