tests/stdio_test.cpp

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <gtest/gtest.h>

#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

TEST(stdio, tmpfile_fileno_fprintf_rewind_fgets) {
  FILE* fp = tmpfile();
  ASSERT_TRUE(fp != NULL);

  int fd = fileno(fp);
  ASSERT_NE(fd, -1);

  struct stat sb;
  int rc = fstat(fd, &sb);
  ASSERT_NE(rc, -1);
  ASSERT_EQ(sb.st_mode & 0777, 0600U);

  rc = fprintf(fp, "hello\n");
  ASSERT_EQ(rc, 6);

  rewind(fp);

  char buf[16];
  char* s = fgets(buf, sizeof(buf), fp);
  ASSERT_TRUE(s != NULL);
  ASSERT_STREQ("hello\n", s);

  fclose(fp);
}

TEST(stdio, getdelim) {
  FILE* fp = tmpfile();
  ASSERT_TRUE(fp != NULL);

  const char* line_written = "This  is a test";
  int rc = fprintf(fp, "%s", line_written);
  ASSERT_EQ(rc, static_cast<int>(strlen(line_written)));

  rewind(fp);

  char* word_read = NULL;
  size_t allocated_length = 0;

  const char* expected[] = { "This ", " ", "is ", "a ", "test" };
  for (size_t i = 0; i < 5; ++i) {
    ASSERT_FALSE(feof(fp));
    ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), static_cast<int>(strlen(expected[i])));
    ASSERT_GE(allocated_length, strlen(expected[i]));
    ASSERT_STREQ(word_read, expected[i]);
  }
  // The last read should have set the end-of-file indicator for the stream.
  ASSERT_TRUE(feof(fp));
  clearerr(fp);

  // getdelim returns -1 but doesn't set errno if we're already at EOF.
  // It should set the end-of-file indicator for the stream, though.
  errno = 0;
  ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), -1);
  ASSERT_EQ(0, errno);
  ASSERT_TRUE(feof(fp));

  free(word_read);
  fclose(fp);
}

TEST(stdio, getdelim_invalid) {
  FILE* fp = tmpfile();

  char* buffer = NULL;
  size_t buffer_length = 0;

  // The first argument can't be NULL.
  errno = 0;
  ASSERT_EQ(getdelim(NULL, &buffer_length, ' ', fp), -1);
  ASSERT_EQ(EINVAL, errno);

  // The second argument can't be NULL.
  errno = 0;
  ASSERT_EQ(getdelim(&buffer, NULL, ' ', fp), -1);
  ASSERT_EQ(EINVAL, errno);

  // The stream can't be closed.
  fclose(fp);
  errno = 0;
  ASSERT_EQ(getdelim(&buffer, &buffer_length, ' ', fp), -1);
  ASSERT_EQ(EBADF, errno);
}

TEST(stdio, getline) {
  FILE* fp = tmpfile();
  ASSERT_TRUE(fp != NULL);

  const char* line_written = "This is a test for getline\n";
  const size_t line_count = 5;

  for (size_t i = 0; i < line_count; ++i) {
    int rc = fprintf(fp, "%s", line_written);
    ASSERT_EQ(rc, static_cast<int>(strlen(line_written)));
  }

  rewind(fp);

  char* line_read = NULL;
  size_t allocated_length = 0;

  size_t read_line_count = 0;
  ssize_t read_char_count;
  while ((read_char_count = getline(&line_read, &allocated_length, fp)) != -1) {
    ASSERT_EQ(read_char_count, static_cast<int>(strlen(line_written)));
    ASSERT_GE(allocated_length, strlen(line_written));
    ASSERT_STREQ(line_read, line_written);
    ++read_line_count;
  }
  ASSERT_EQ(read_line_count, line_count);

  // The last read should have set the end-of-file indicator for the stream.
  ASSERT_TRUE(feof(fp));
  clearerr(fp);

  // getline returns -1 but doesn't set errno if we're already at EOF.
  // It should set the end-of-file indicator for the stream, though.
  errno = 0;
  ASSERT_EQ(getline(&line_read, &allocated_length, fp), -1);
  ASSERT_EQ(0, errno);
  ASSERT_TRUE(feof(fp));

  free(line_read);
  fclose(fp);
}

TEST(stdio, getline_invalid) {
  FILE* fp = tmpfile();

  char* buffer = NULL;
  size_t buffer_length = 0;

  // The first argument can't be NULL.
  errno = 0;
  ASSERT_EQ(getline(NULL, &buffer_length, fp), -1);
  ASSERT_EQ(EINVAL, errno);

  // The second argument can't be NULL.
  errno = 0;
  ASSERT_EQ(getline(&buffer, NULL, fp), -1);
  ASSERT_EQ(EINVAL, errno);

  // The stream can't be closed.
  fclose(fp);
  errno = 0;
  ASSERT_EQ(getline(&buffer, &buffer_length, fp), -1);
  ASSERT_EQ(EBADF, errno);
}