/*
 * 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 <limits.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);
}

TEST(stdio, printf_ssize_t) {
  // http://b/8253769
  ASSERT_EQ(sizeof(ssize_t), sizeof(long int));
  ASSERT_EQ(sizeof(ssize_t), sizeof(size_t));
  // For our 32-bit ABI, we had a ssize_t definition that confuses GCC into saying:
  // error: format '%zd' expects argument of type 'signed size_t',
  //     but argument 4 has type 'ssize_t {aka long int}' [-Werror=format]
  ssize_t v = 1;
  char buf[32];
  snprintf(buf, sizeof(buf), "%zd", v);
}

#if !defined(__GLIBC__)
TEST(stdio, snprintf_n_format_specifier_not_implemented) {
  char buf[32];
  int i = 0;
  // We deliberately don't implement %n, so it's treated like
  // any other unrecognized format specifier.
  EXPECT_EQ(5, snprintf(buf, sizeof(buf), "a %n b", &i));
  EXPECT_EQ(0, i);
  EXPECT_STREQ("a n b", buf);
}
#endif

TEST(stdio, snprintf_smoke) {
  char buf[BUFSIZ];

  snprintf(buf, sizeof(buf), "a");
  EXPECT_STREQ("a", buf);

  snprintf(buf, sizeof(buf), "%%");
  EXPECT_STREQ("%", buf);

  snprintf(buf, sizeof(buf), "01234");
  EXPECT_STREQ("01234", buf);

  snprintf(buf, sizeof(buf), "a%sb", "01234");
  EXPECT_STREQ("a01234b", buf);

  char* s = NULL;
  snprintf(buf, sizeof(buf), "a%sb", s);
  EXPECT_STREQ("a(null)b", buf);

  snprintf(buf, sizeof(buf), "aa%scc", "bb");
  EXPECT_STREQ("aabbcc", buf);

  snprintf(buf, sizeof(buf), "a%cc", 'b');
  EXPECT_STREQ("abc", buf);

  snprintf(buf, sizeof(buf), "a%db", 1234);
  EXPECT_STREQ("a1234b", buf);

  snprintf(buf, sizeof(buf), "a%db", -8123);
  EXPECT_STREQ("a-8123b", buf);

  snprintf(buf, sizeof(buf), "a%hdb", static_cast<short>(0x7fff0010));
  EXPECT_STREQ("a16b", buf);

  snprintf(buf, sizeof(buf), "a%hhdb", static_cast<char>(0x7fffff10));
  EXPECT_STREQ("a16b", buf);

  snprintf(buf, sizeof(buf), "a%lldb", 0x1000000000LL);
  EXPECT_STREQ("a68719476736b", buf);

  snprintf(buf, sizeof(buf), "a%ldb", 70000L);
  EXPECT_STREQ("a70000b", buf);

  snprintf(buf, sizeof(buf), "a%pb", reinterpret_cast<void*>(0xb0001234));
  EXPECT_STREQ("a0xb0001234b", buf);

  snprintf(buf, sizeof(buf), "a%xz", 0x12ab);
  EXPECT_STREQ("a12abz", buf);

  snprintf(buf, sizeof(buf), "a%Xz", 0x12ab);
  EXPECT_STREQ("a12ABz", buf);

  snprintf(buf, sizeof(buf), "a%08xz", 0x123456);
  EXPECT_STREQ("a00123456z", buf);

  snprintf(buf, sizeof(buf), "a%5dz", 1234);
  EXPECT_STREQ("a 1234z", buf);

  snprintf(buf, sizeof(buf), "a%05dz", 1234);
  EXPECT_STREQ("a01234z", buf);

  snprintf(buf, sizeof(buf), "a%8dz", 1234);
  EXPECT_STREQ("a    1234z", buf);

  snprintf(buf, sizeof(buf), "a%-8dz", 1234);
  EXPECT_STREQ("a1234    z", buf);

  snprintf(buf, sizeof(buf), "A%-11sZ", "abcdef");
  EXPECT_STREQ("Aabcdef     Z", buf);

  snprintf(buf, sizeof(buf), "A%s:%dZ", "hello", 1234);
  EXPECT_STREQ("Ahello:1234Z", buf);

  snprintf(buf, sizeof(buf), "a%03d:%d:%02dz", 5, 5, 5);
  EXPECT_STREQ("a005:5:05z", buf);

  void* p = NULL;
  snprintf(buf, sizeof(buf), "a%d,%pz", 5, p);
  EXPECT_STREQ("a5,0x0z", buf);

  snprintf(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8);
  EXPECT_STREQ("a68719476736,6,7,8z", buf);

  snprintf(buf, sizeof(buf), "a_%f_b", 1.23f);
  EXPECT_STREQ("a_1.230000_b", buf);

  snprintf(buf, sizeof(buf), "a_%g_b", 3.14);
  EXPECT_STREQ("a_3.14_b", buf);
}

TEST(stdio, snprintf_d_INT_MAX) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%d", INT_MAX);
  EXPECT_STREQ("2147483647", buf);
}

TEST(stdio, snprintf_d_INT_MIN) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%d", INT_MIN);
  EXPECT_STREQ("-2147483648", buf);
}

TEST(stdio, snprintf_ld_LONG_MAX) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%ld", LONG_MAX);
  EXPECT_STREQ("2147483647", buf);
}

TEST(stdio, snprintf_ld_LONG_MIN) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%ld", LONG_MIN);
  EXPECT_STREQ("-2147483648", buf);
}

TEST(stdio, snprintf_lld_LLONG_MAX) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%lld", LLONG_MAX);
  EXPECT_STREQ("9223372036854775807", buf);
}

TEST(stdio, snprintf_lld_LLONG_MIN) {
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%lld", LLONG_MIN);
  EXPECT_STREQ("-9223372036854775808", buf);
}

TEST(stdio, popen) {
  FILE* fp = popen("cat /proc/version", "r");
  ASSERT_TRUE(fp != NULL);

  char buf[16];
  char* s = fgets(buf, sizeof(buf), fp);
  buf[13] = '\0';
  ASSERT_STREQ("Linux version", s);

  ASSERT_EQ(0, pclose(fp));
}

TEST(stdio, getc) {
  FILE* fp = fopen("/proc/version", "r");
  ASSERT_TRUE(fp != NULL);
  ASSERT_EQ('L', getc(fp));
  ASSERT_EQ('i', getc(fp));
  ASSERT_EQ('n', getc(fp));
  ASSERT_EQ('u', getc(fp));
  ASSERT_EQ('x', getc(fp));
  fclose(fp);
}

TEST(stdio, putc) {
  FILE* fp = fopen("/proc/version", "r");
  ASSERT_TRUE(fp != NULL);
  ASSERT_EQ(EOF, putc('x', fp));
  fclose(fp);
}