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/fcntl/open.h"
10 #include "src/unistd/close.h"
11 #include "src/unistd/lseek.h"
12 #include "src/unistd/read.h"
13 #include "test/ErrnoSetterMatcher.h"
14 #include "utils/UnitTest/Test.h"
15 #include "utils/testutils/FDReader.h"
16 
17 #include <errno.h>
18 #include <unistd.h>
19 
20 TEST(LlvmLibcUniStd, LseekTest) {
21   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
22   constexpr const char *TEST_FILE = "testdata/lseek.test";
23   int fd = __llvm_libc::open(TEST_FILE, O_RDONLY);
24   ASSERT_EQ(errno, 0);
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(__llvm_libc::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(__llvm_libc::lseek(fd, 0, SEEK_SET), Succeeds(0));
37   ASSERT_THAT(__llvm_libc::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(__llvm_libc::lseek(fd, -LSEEK_TEST_SIZE, SEEK_END), Succeeds(0));
44   ASSERT_THAT(__llvm_libc::read(fd, read_buf, LSEEK_TEST_SIZE),
45               Succeeds(LSEEK_TEST_SIZE));
46   read_buf[LSEEK_TEST_SIZE] = '\0';
47   EXPECT_STREQ(read_buf, LSEEK_TEST);
48 
49   ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0));
50 }
51 
52 TEST(LlvmLibcUniStd, LseekFailsTest) {
53   using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
54   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
55   constexpr const char *TEST_FILE = "testdata/lseek.test";
56   int fd = __llvm_libc::open(TEST_FILE, O_RDONLY);
57   ASSERT_EQ(errno, 0);
58   ASSERT_GT(fd, 0);
59   EXPECT_THAT(__llvm_libc::lseek(fd, -1, SEEK_CUR), Fails(EINVAL));
60   ASSERT_THAT(__llvm_libc::close(fd), Succeeds(0));
61 }
62