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//===-- Unittests for fgets -----------------------------------------------===//
//
// 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/feof.h"
#include "src/stdio/ferror.h"
#include "src/stdio/fgets.h"
#include "src/stdio/fopen.h"
#include "src/stdio/fwrite.h"
#include "test/UnitTest/Test.h"
#include "src/errno/libc_errno.h"
#include <stdio.h>
TEST(LlvmLibcFgetsTest, WriteAndReadCharacters) {
constexpr char FILENAME[] = "testdata/fgets.test";
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
constexpr char CONTENT[] = "123456789\n"
"1234567\n"
"123456\n"
"1";
constexpr size_t WRITE_SIZE = sizeof(CONTENT) - 1;
char buff[8];
char *output;
ASSERT_EQ(WRITE_SIZE, LIBC_NAMESPACE::fwrite(CONTENT, 1, WRITE_SIZE, file));
// This is a write-only file so reads should fail.
ASSERT_TRUE(LIBC_NAMESPACE::fgets(buff, 8, file) == nullptr);
// This is an error and not a real EOF.
ASSERT_EQ(LIBC_NAMESPACE::feof(file), 0);
ASSERT_NE(LIBC_NAMESPACE::ferror(file), 0);
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(file == nullptr);
// If we request just 1 byte, it should return just a null byte and not
// advance the read head. This is implementation defined.
output = LIBC_NAMESPACE::fgets(buff, 1, file);
ASSERT_TRUE(output == buff);
ASSERT_EQ(buff[0], '\0');
ASSERT_ERRNO_SUCCESS();
// If we request less than 1 byte, it should do nothing and return nullptr.
// This is also implementation defined.
output = LIBC_NAMESPACE::fgets(buff, 0, file);
ASSERT_TRUE(output == nullptr);
const char *output_arr[] = {
"1234567", "89\n", "1234567", "\n", "123456\n", "1",
};
constexpr size_t ARR_SIZE = sizeof(output_arr) / sizeof(char *);
for (size_t i = 0; i < ARR_SIZE; ++i) {
output = LIBC_NAMESPACE::fgets(buff, 8, file);
// This pointer comparison is intentional, fgets should return a pointer to
// buff when it succeeds.
ASSERT_TRUE(output == buff);
ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
EXPECT_STREQ(buff, output_arr[i]);
}
// This should have hit the end of the file, but that isn't an error unless it
// fails to read anything.
ASSERT_NE(LIBC_NAMESPACE::feof(file), 0);
ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
ASSERT_ERRNO_SUCCESS();
// Reading more should be an EOF, but not an error.
output = LIBC_NAMESPACE::fgets(buff, 8, file);
ASSERT_TRUE(output == nullptr);
ASSERT_NE(LIBC_NAMESPACE::feof(file), 0);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
}
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