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//===-- Unittests for file operations like fopen, flcose etc --------------===//
//
// 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/clearerr.h"
#include "src/stdio/fclose.h"
#include "src/stdio/feof.h"
#include "src/stdio/ferror.h"
#include "src/stdio/fflush.h"
#include "src/stdio/fopen.h"
#include "src/stdio/fputs.h"
#include "src/stdio/fread.h"
#include "src/stdio/fseek.h"
#include "src/stdio/fwrite.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include "src/errno/libc_errno.h"
#include <stdio.h>
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::EQ;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::NE;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::returns;
TEST(LlvmLibcFILETest, SimpleFileOperations) {
constexpr char FILENAME[] = "testdata/simple_operations.test";
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
constexpr char CONTENT[] = "1234567890987654321";
ASSERT_EQ(sizeof(CONTENT) - 1,
LIBC_NAMESPACE::fwrite(CONTENT, 1, sizeof(CONTENT) - 1, file));
// This is not a readable file.
char read_data[sizeof(CONTENT)];
ASSERT_THAT(LIBC_NAMESPACE::fread(read_data, 1, sizeof(CONTENT), file),
returns(EQ(size_t(0))).with_errno(NE(0)));
ASSERT_NE(LIBC_NAMESPACE::ferror(file), 0);
LIBC_NAMESPACE::libc_errno = 0;
LIBC_NAMESPACE::clearerr(file);
ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(file == nullptr);
constexpr size_t READ_SIZE = 5;
char data[READ_SIZE];
data[READ_SIZE - 1] = '\0';
ASSERT_EQ(LIBC_NAMESPACE::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
ASSERT_STREQ(data, "1234");
ASSERT_EQ(LIBC_NAMESPACE::fseek(file, 5, SEEK_CUR), 0);
ASSERT_EQ(LIBC_NAMESPACE::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
ASSERT_STREQ(data, "0987");
ASSERT_EQ(LIBC_NAMESPACE::fseek(file, -5, SEEK_CUR), 0);
ASSERT_EQ(LIBC_NAMESPACE::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
ASSERT_STREQ(data, "9098");
// Reading another time should trigger eof.
ASSERT_NE(sizeof(CONTENT),
LIBC_NAMESPACE::fread(read_data, 1, sizeof(CONTENT), file));
ASSERT_NE(LIBC_NAMESPACE::feof(file), 0);
// Should be an error to write.
ASSERT_THAT(LIBC_NAMESPACE::fwrite(CONTENT, 1, sizeof(CONTENT), file),
returns(EQ(size_t(0))).with_errno(NE(0)));
ASSERT_NE(LIBC_NAMESPACE::ferror(file), 0);
LIBC_NAMESPACE::libc_errno = 0;
LIBC_NAMESPACE::clearerr(file);
// Should be an error to puts.
ASSERT_THAT(LIBC_NAMESPACE::fputs(CONTENT, file),
returns(EQ(EOF)).with_errno(NE(0)));
ASSERT_NE(LIBC_NAMESPACE::ferror(file), 0);
LIBC_NAMESPACE::libc_errno = 0;
LIBC_NAMESPACE::clearerr(file);
ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_THAT(LIBC_NAMESPACE::fwrite("nothing", 1, 1, file),
returns(EQ(0)).with_errno(NE(0)));
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
// Now try puts.
file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
// fputs returns a negative value on error (EOF) or any non-negative value on
// success. This assert checks that the return value is non-negative.
ASSERT_GE(LIBC_NAMESPACE::fputs(CONTENT, file), 0);
LIBC_NAMESPACE::clearerr(file);
ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
// This is not a readable file.
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_THAT(LIBC_NAMESPACE::fread(data, 1, 1, file),
returns(EQ(0)).with_errno(NE(0)));
LIBC_NAMESPACE::libc_errno = 0;
ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(file == nullptr);
ASSERT_EQ(LIBC_NAMESPACE::fread(read_data, 1, sizeof(CONTENT) - 1, file),
sizeof(CONTENT) - 1);
read_data[sizeof(CONTENT) - 1] = '\0';
ASSERT_STREQ(read_data, CONTENT);
ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
// Check that the other functions correctly set libc_errno.
// LIBC_NAMESPACE::libc_errno = 0;
// ASSERT_NE(LIBC_NAMESPACE::fseek(file, 0, SEEK_SET), 0);
// ASSERT_ERRNO_FAILURE();
// LIBC_NAMESPACE::libc_errno = 0;
// ASSERT_NE(LIBC_NAMESPACE::fclose(file), 0);
// ASSERT_ERRNO_FAILURE();
// LIBC_NAMESPACE::libc_errno = 0;
// ASSERT_EQ(LIBC_NAMESPACE::fopen("INVALID FILE NAME", "r"),
// static_cast<FILE *>(nullptr));
// ASSERT_ERRNO_FAILURE();
}
TEST(LlvmLibcFILETest, FFlush) {
constexpr char FILENAME[] = "testdata/fflush.test";
::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w+");
ASSERT_FALSE(file == nullptr);
constexpr char CONTENT[] = "1234567890987654321";
ASSERT_EQ(sizeof(CONTENT),
LIBC_NAMESPACE::fwrite(CONTENT, 1, sizeof(CONTENT), file));
// Flushing at this point should write the data to disk. So, we should be
// able to read it back.
ASSERT_EQ(0, LIBC_NAMESPACE::fflush(file));
char data[sizeof(CONTENT)];
ASSERT_EQ(LIBC_NAMESPACE::fseek(file, 0, SEEK_SET), 0);
ASSERT_EQ(LIBC_NAMESPACE::fread(data, 1, sizeof(CONTENT), file),
sizeof(CONTENT));
ASSERT_STREQ(data, CONTENT);
ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
}
TEST(LlvmLibcFILETest, FOpenFWriteSizeGreaterThanOne) {
using MyStruct = struct {
char c;
unsigned long long i;
};
constexpr MyStruct WRITE_DATA[] = {{'a', 1}, {'b', 2}, {'c', 3}};
constexpr size_t WRITE_NMEMB = sizeof(WRITE_DATA) / sizeof(MyStruct);
constexpr char FILENAME[] = "testdata/fread_fwrite.test";
LIBC_NAMESPACE::libc_errno = 0;
FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
ASSERT_FALSE(file == nullptr);
ASSERT_EQ(size_t(0), LIBC_NAMESPACE::fwrite(WRITE_DATA, 0, 1, file));
ASSERT_THAT(
LIBC_NAMESPACE::fwrite(WRITE_DATA, sizeof(MyStruct), WRITE_NMEMB, file),
returns(EQ(WRITE_NMEMB)).with_errno(EQ(0)));
ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
file = LIBC_NAMESPACE::fopen(FILENAME, "r");
ASSERT_FALSE(file == nullptr);
MyStruct read_data[WRITE_NMEMB];
ASSERT_EQ(size_t(0), LIBC_NAMESPACE::fread(read_data, 0, 1, file));
ASSERT_THAT(
LIBC_NAMESPACE::fread(read_data, sizeof(MyStruct), WRITE_NMEMB, file),
returns(EQ(WRITE_NMEMB)).with_errno(EQ(0)));
// Trying to read more should fetch nothing.
ASSERT_THAT(
LIBC_NAMESPACE::fread(read_data, sizeof(MyStruct), WRITE_NMEMB, file),
returns(EQ(0)).with_errno(EQ(0)));
EXPECT_NE(LIBC_NAMESPACE::feof(file), 0);
EXPECT_EQ(LIBC_NAMESPACE::ferror(file), 0);
ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
// Verify that the data which was read is correct.
for (size_t i = 0; i < WRITE_NMEMB; ++i) {
ASSERT_EQ(read_data[i].c, WRITE_DATA[i].c);
ASSERT_EQ(read_data[i].i, WRITE_DATA[i].i);
}
}
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