110 lines · cpp
1//===-- Unittests for setvbuf ---------------------------------------------===//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-exception6//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/setvbuf.h"14#include "test/UnitTest/ErrnoCheckingTest.h"15#include "test/UnitTest/Test.h"16 17#include "hdr/stdio_macros.h"18 19using LlvmLibcSetvbufTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;20 21TEST_F(LlvmLibcSetvbufTest, SetNBFBuffer) {22 // The idea in this test is that we open a file for writing and reading, and23 // then set a NBF buffer to the write handle. Since it is NBF, the data24 // written using the write handle should be immediately readable by the read25 // handle.26 constexpr char FILENAME[] = APPEND_LIBC_TEST("testdata/setvbuf_nbf.test");27 28 ::FILE *fw = LIBC_NAMESPACE::fopen(FILENAME, "w");29 ASSERT_FALSE(fw == nullptr);30 char buffer[BUFSIZ];31 ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fw, buffer, _IONBF, BUFSIZ), 0);32 33 ::FILE *fr = LIBC_NAMESPACE::fopen(FILENAME, "r");34 ASSERT_FALSE(fr == nullptr);35 36 constexpr char CONTENT[] = "abcdef";37 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);38 for (size_t i = 0; i < CONTENT_SIZE; ++i) {39 ASSERT_EQ(size_t(1), LIBC_NAMESPACE::fwrite(CONTENT + i, 1, 1, fw));40 char c;41 ASSERT_EQ(size_t(1), LIBC_NAMESPACE::fread(&c, 1, 1, fr));42 ASSERT_EQ(c, CONTENT[i]);43 }44 45 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fw));46 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));47 48 // Make sure NBF buffer has no effect for reading.49 fr = LIBC_NAMESPACE::fopen(FILENAME, "r");50 char data[CONTENT_SIZE];51 ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fr, buffer, _IONBF, BUFSIZ), 0);52 ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));53 ASSERT_STREQ(CONTENT, data);54 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));55}56 57TEST_F(LlvmLibcSetvbufTest, SetLBFBuffer) {58 // The idea in this test is that we open a file for writing and reading, and59 // then set a LBF buffer to the write handle. Since it is LBF, the data60 // written using the write handle should be available right after a '\n' is61 // written.62 constexpr char FILENAME[] = APPEND_LIBC_TEST("testdata/setvbuf_lbf.test");63 64 ::FILE *fw = LIBC_NAMESPACE::fopen(FILENAME, "w");65 ASSERT_FALSE(fw == nullptr);66 char buffer[BUFSIZ];67 ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fw, buffer, _IOLBF, BUFSIZ), 0);68 69 ::FILE *fr = LIBC_NAMESPACE::fopen(FILENAME, "r");70 ASSERT_FALSE(fr == nullptr);71 72 constexpr char CONTENT[] = "abcdef\n";73 constexpr size_t CONTENT_SIZE = sizeof(CONTENT);74 ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, fw));75 76 // Note that CONTENT_SIZE worth of data written also includes the77 // null-terminator '\0'. But, since it is after the new line character,78 // it should not be availabe for reading.79 char data[CONTENT_SIZE];80 ASSERT_EQ(CONTENT_SIZE - 1, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));81 char c;82 ASSERT_EQ(size_t(0), LIBC_NAMESPACE::fread(&c, 1, 1, fr));83 84 data[CONTENT_SIZE - 1] = '\0';85 ASSERT_STREQ(CONTENT, data);86 87 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fw));88 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));89 90 // Make sure LBF buffer has no effect for reading.91 fr = LIBC_NAMESPACE::fopen(FILENAME, "r");92 ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fr, buffer, _IOLBF, BUFSIZ), 0);93 ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));94 ASSERT_STREQ(CONTENT, data);95 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));96}97 98TEST(LlvmLibcSetbufTest, InvalidBufferMode) {99 constexpr char FILENAME[] =100 APPEND_LIBC_TEST("testdata/setvbuf_invalid_bufmode.test");101 ::FILE *f = LIBC_NAMESPACE::fopen(FILENAME, "w");102 ASSERT_FALSE(f == nullptr);103 char buf[BUFSIZ];104 ASSERT_NE(LIBC_NAMESPACE::setvbuf(f, buf, _IOFBF + _IOLBF + _IONBF, BUFSIZ),105 0);106 ASSERT_ERRNO_EQ(EINVAL);107 108 ASSERT_EQ(0, LIBC_NAMESPACE::fclose(f));109}110