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
TEST(LlvmLibcUniStd,LseekTest)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
TEST(LlvmLibcUniStd,LseekFailsTest)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