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//===-- Unittests for ftell -----------------------------------------------===//
//
// 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/fseek.h"
#include "src/stdio/ftell.h"
#include "src/stdio/fwrite.h"
#include "src/stdio/setvbuf.h"
#include "test/UnitTest/Test.h"
#include <stdio.h>
class LlvmLibcFTellTest : public LIBC_NAMESPACE::testing::Test {
protected:
void test_with_bufmode(int bufmode) {
constexpr char FILENAME[] = "testdata/ftell.test";
// We will set a special buffer to the file so that we guarantee buffering.
constexpr size_t BUFFER_SIZE = 1024;
char buffer[BUFFER_SIZE];
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w+");
ASSERT_FALSE(file == nullptr);
ASSERT_EQ(LIBC_NAMESPACE::setvbuf(file, buffer, bufmode, BUFFER_SIZE), 0);
// Include few '\n' chars to test when |bufmode| is _IOLBF.
constexpr char CONTENT[] = "12\n345\n6789";
constexpr size_t WRITE_SIZE = sizeof(CONTENT) - 1;
ASSERT_EQ(WRITE_SIZE, LIBC_NAMESPACE::fwrite(CONTENT, 1, WRITE_SIZE, file));
// The above write should have buffered the written data and not have
// trasferred it to the underlying stream. But, ftell operation should
// still return the correct effective offset.
ASSERT_EQ(size_t(LIBC_NAMESPACE::ftell(file)), WRITE_SIZE);
long offset = 5;
ASSERT_EQ(0, LIBC_NAMESPACE::fseek(file, offset, SEEK_SET));
ASSERT_EQ(LIBC_NAMESPACE::ftell(file), offset);
ASSERT_EQ(0, LIBC_NAMESPACE::fseek(file, -offset, SEEK_END));
ASSERT_EQ(size_t(LIBC_NAMESPACE::ftell(file)), size_t(WRITE_SIZE - offset));
ASSERT_EQ(0, LIBC_NAMESPACE::fseek(file, 0, SEEK_SET));
constexpr size_t READ_SIZE = WRITE_SIZE / 2;
char data[READ_SIZE];
// Reading a small amount will actually read out much more data and
// buffer it. But, ftell should return the correct effective offset.
ASSERT_EQ(READ_SIZE, LIBC_NAMESPACE::fread(data, 1, READ_SIZE, file));
ASSERT_EQ(size_t(LIBC_NAMESPACE::ftell(file)), READ_SIZE);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
}
};
TEST_F(LlvmLibcFTellTest, TellWithFBF) { test_with_bufmode(_IOFBF); }
TEST_F(LlvmLibcFTellTest, TellWithNBF) { test_with_bufmode(_IONBF); }
TEST_F(LlvmLibcFTellTest, TellWithLBF) { test_with_bufmode(_IOLBF); }
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