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//===-- Unittests for setbuf ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/stdio/fclose.h"
#include "src/stdio/fopen.h"
#include "src/stdio/fread.h"
#include "src/stdio/fwrite.h"
#include "src/stdio/setbuf.h"
#include "src/stdio/ungetc.h"
#include "test/UnitTest/Test.h"
#include <stdio.h>
TEST(LlvmLibcSetbufTest, DefaultBufsize) {
// The idea in this test is to change the buffer after opening a file and
// ensure that read and write work as expected.
constexpr char FILENAME[] = "testdata/setbuf_test_default_bufsize.test";
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
char buffer[BUFSIZ];
LIBC_NAMESPACE::setbuf(file, buffer);
constexpr char CONTENT[] = "abcdef";
constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
ASSERT_EQ(CONTENT_SIZE,
LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
LIBC_NAMESPACE::setbuf(file, buffer);
ASSERT_FALSE(file == nullptr);
char data[CONTENT_SIZE];
ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
ASSERT_STREQ(CONTENT, data);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
}
TEST(LlvmLibcSetbufTest, NullBuffer) {
// The idea in this test is that we set a null buffer and ensure that
// everything works correctly.
constexpr char FILENAME[] = "testdata/setbuf_test_null_buffer.test";
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
LIBC_NAMESPACE::setbuf(file, nullptr);
constexpr char CONTENT[] = "abcdef";
constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
ASSERT_EQ(CONTENT_SIZE,
LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, file));
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
LIBC_NAMESPACE::setbuf(file, nullptr);
ASSERT_FALSE(file == nullptr);
char data[CONTENT_SIZE];
ASSERT_EQ(LIBC_NAMESPACE::fread(&data, 1, CONTENT_SIZE, file), CONTENT_SIZE);
ASSERT_STREQ(CONTENT, data);
// Ensure that ungetc also works.
char unget_char = 'z';
ASSERT_EQ(int(unget_char), LIBC_NAMESPACE::ungetc(unget_char, file));
char c;
ASSERT_EQ(LIBC_NAMESPACE::fread(&c, 1, 1, file), size_t(1));
ASSERT_EQ(c, unget_char);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
}
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