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//===-- Unittests for setvbuf ---------------------------------------------===//
//
// 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/setvbuf.h"
#include "test/UnitTest/Test.h"
#include "src/errno/libc_errno.h"
#include <stdio.h>
TEST(LlvmLibcSetvbufTest, SetNBFBuffer) {
// The idea in this test is that we open a file for writing and reading, and
// then set a NBF buffer to the write handle. Since it is NBF, the data
// written using the write handle should be immediately readable by the read
// handle.
constexpr char FILENAME[] = "testdata/setvbuf_nbf.test";
::FILE *fw = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(fw == nullptr);
char buffer[BUFSIZ];
ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fw, buffer, _IONBF, BUFSIZ), 0);
::FILE *fr = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(fr == nullptr);
constexpr char CONTENT[] = "abcdef";
constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
for (size_t i = 0; i < CONTENT_SIZE; ++i) {
ASSERT_EQ(size_t(1), LIBC_NAMESPACE::fwrite(CONTENT + i, 1, 1, fw));
char c;
ASSERT_EQ(size_t(1), LIBC_NAMESPACE::fread(&c, 1, 1, fr));
ASSERT_EQ(c, CONTENT[i]);
}
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fw));
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));
// Make sure NBF buffer has no effect for reading.
fr = LIBC_NAMESPACE::fopen(FILENAME, "r");
char data[CONTENT_SIZE];
ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fr, buffer, _IONBF, BUFSIZ), 0);
ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));
ASSERT_STREQ(CONTENT, data);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));
}
TEST(LlvmLibcSetvbufTest, SetLBFBuffer) {
// The idea in this test is that we open a file for writing and reading, and
// then set a LBF buffer to the write handle. Since it is LBF, the data
// written using the write handle should be available right after a '\n' is
// written.
constexpr char FILENAME[] = "testdata/setvbuf_lbf.test";
::FILE *fw = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(fw == nullptr);
char buffer[BUFSIZ];
ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fw, buffer, _IOLBF, BUFSIZ), 0);
::FILE *fr = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(fr == nullptr);
constexpr char CONTENT[] = "abcdef\n";
constexpr size_t CONTENT_SIZE = sizeof(CONTENT);
ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fwrite(CONTENT, 1, CONTENT_SIZE, fw));
// Note that CONTENT_SIZE worth of data written also includes the
// null-terminator '\0'. But, since it is after the new line character,
// it should not be availabe for reading.
char data[CONTENT_SIZE];
ASSERT_EQ(CONTENT_SIZE - 1, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));
char c;
ASSERT_EQ(size_t(0), LIBC_NAMESPACE::fread(&c, 1, 1, fr));
data[CONTENT_SIZE - 1] = '\0';
ASSERT_STREQ(CONTENT, data);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fw));
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));
// Make sure LBF buffer has no effect for reading.
fr = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_EQ(LIBC_NAMESPACE::setvbuf(fr, buffer, _IOLBF, BUFSIZ), 0);
ASSERT_EQ(CONTENT_SIZE, LIBC_NAMESPACE::fread(data, 1, CONTENT_SIZE, fr));
ASSERT_STREQ(CONTENT, data);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(fr));
}
TEST(LlvmLibcSetbufTest, InvalidBufferMode) {
constexpr char FILENAME[] = "testdata/setvbuf_invalid_bufmode.test";
::FILE *f = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(f == nullptr);
char buf[BUFSIZ];
ASSERT_NE(LIBC_NAMESPACE::setvbuf(f, buf, _IOFBF + _IOLBF + _IONBF, BUFSIZ),
0);
ASSERT_ERRNO_EQ(EINVAL);
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(f));
}
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