libc/test/src/unistd/lseek_test.cpp

   1 //===-- Unittests for lseek -----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/errno/libc_errno.h"
  10 #include "src/fcntl/open.h"
  11 #include "src/unistd/close.h"
  12 #include "src/unistd/lseek.h"
  13 #include "src/unistd/read.h"
  14 #include "test/UnitTest/ErrnoSetterMatcher.h"
  15 #include "test/UnitTest/Test.h"
  16
  17 #include <unistd.h>
  18
  19 TEST(LlvmLibcUniStd, LseekTest) {
  20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  21   constexpr const char *FILENAME = "testdata/lseek.test";
  22   auto TEST_FILE = libc_make_test_file_path(FILENAME);
  23   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
  24   ASSERT_ERRNO_SUCCESS();
  25   ASSERT_GT(fd, 0);
  26   constexpr const char LSEEK_TEST[] = "lseek test";
  27   constexpr int LSEEK_TEST_SIZE = sizeof(LSEEK_TEST) - 1;
  28
  29   char read_buf[20];
  30   ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
  31               Succeeds(LSEEK_TEST_SIZE));
  32   read_buf[LSEEK_TEST_SIZE] = '\0';
  33   EXPECT_STREQ(read_buf, LSEEK_TEST);
  34
  35   // Seek to the beginning of the file and re-read.
  36   ASSERT_THAT(LIBC_NAMESPACE::lseek(fd, 0, SEEK_SET), Succeeds(0));
  37   ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
  38               Succeeds(LSEEK_TEST_SIZE));
  39   read_buf[LSEEK_TEST_SIZE] = '\0';
  40   EXPECT_STREQ(read_buf, LSEEK_TEST);
  41
  42   // Seek to the beginning of the file from the end and re-read.
  43   ASSERT_THAT(LIBC_NAMESPACE::lseek(fd, -LSEEK_TEST_SIZE, SEEK_END),
  44               Succeeds(0));
  45   ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
  46               Succeeds(LSEEK_TEST_SIZE));
  47   read_buf[LSEEK_TEST_SIZE] = '\0';
  48   EXPECT_STREQ(read_buf, LSEEK_TEST);
  49
  50   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
  51 }
  52
  53 TEST(LlvmLibcUniStd, LseekFailsTest) {
  54   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  55   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  56   constexpr const char *FILENAME = "testdata/lseek.test";
  57   auto TEST_FILE = libc_make_test_file_path(FILENAME);
  58   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
  59   ASSERT_ERRNO_SUCCESS();
  60   ASSERT_GT(fd, 0);
  61   EXPECT_THAT(LIBC_NAMESPACE::lseek(fd, -1, SEEK_CUR), Fails(EINVAL));
  62   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
  63 }