xref: /aosp_15_r20/external/llvm-libc/test/src/unistd/truncate_test.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
1*71db0c75SAndroid Build Coastguard Worker //===-- Unittests for truncate --------------------------------------------===//
2*71db0c75SAndroid Build Coastguard Worker //
3*71db0c75SAndroid Build Coastguard Worker // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*71db0c75SAndroid Build Coastguard Worker // See https://llvm.org/LICENSE.txt for license information.
5*71db0c75SAndroid Build Coastguard Worker // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*71db0c75SAndroid Build Coastguard Worker //
7*71db0c75SAndroid Build Coastguard Worker //===----------------------------------------------------------------------===//
8*71db0c75SAndroid Build Coastguard Worker 
9*71db0c75SAndroid Build Coastguard Worker #include "src/__support/CPP/string_view.h"
10*71db0c75SAndroid Build Coastguard Worker #include "src/errno/libc_errno.h"
11*71db0c75SAndroid Build Coastguard Worker #include "src/fcntl/open.h"
12*71db0c75SAndroid Build Coastguard Worker #include "src/unistd/close.h"
13*71db0c75SAndroid Build Coastguard Worker #include "src/unistd/read.h"
14*71db0c75SAndroid Build Coastguard Worker #include "src/unistd/truncate.h"
15*71db0c75SAndroid Build Coastguard Worker #include "src/unistd/unlink.h"
16*71db0c75SAndroid Build Coastguard Worker #include "src/unistd/write.h"
17*71db0c75SAndroid Build Coastguard Worker #include "test/UnitTest/ErrnoSetterMatcher.h"
18*71db0c75SAndroid Build Coastguard Worker #include "test/UnitTest/Test.h"
19*71db0c75SAndroid Build Coastguard Worker 
20*71db0c75SAndroid Build Coastguard Worker #include <sys/stat.h>
21*71db0c75SAndroid Build Coastguard Worker 
22*71db0c75SAndroid Build Coastguard Worker namespace cpp = LIBC_NAMESPACE::cpp;
23*71db0c75SAndroid Build Coastguard Worker 
TEST(LlvmLibcTruncateTest,CreateAndTruncate)24*71db0c75SAndroid Build Coastguard Worker TEST(LlvmLibcTruncateTest, CreateAndTruncate) {
25*71db0c75SAndroid Build Coastguard Worker   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
26*71db0c75SAndroid Build Coastguard Worker   constexpr const char *FILENAME = "truncate.test";
27*71db0c75SAndroid Build Coastguard Worker   auto TEST_FILE = libc_make_test_file_path(FILENAME);
28*71db0c75SAndroid Build Coastguard Worker   constexpr const char WRITE_DATA[] = "hello, truncate";
29*71db0c75SAndroid Build Coastguard Worker   constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA);
30*71db0c75SAndroid Build Coastguard Worker   char buf[WRITE_SIZE];
31*71db0c75SAndroid Build Coastguard Worker 
32*71db0c75SAndroid Build Coastguard Worker   // The test strategy is as follows:
33*71db0c75SAndroid Build Coastguard Worker   //   1. Create a normal file with some data in it.
34*71db0c75SAndroid Build Coastguard Worker   //   2. Read it to make sure what was written is actually in the file.
35*71db0c75SAndroid Build Coastguard Worker   //   3. Truncate to 1 byte.
36*71db0c75SAndroid Build Coastguard Worker   //   4. Try to read more than 1 byte and fail.
37*71db0c75SAndroid Build Coastguard Worker   LIBC_NAMESPACE::libc_errno = 0;
38*71db0c75SAndroid Build Coastguard Worker   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
39*71db0c75SAndroid Build Coastguard Worker   ASSERT_ERRNO_SUCCESS();
40*71db0c75SAndroid Build Coastguard Worker   ASSERT_GT(fd, 0);
41*71db0c75SAndroid Build Coastguard Worker   ASSERT_EQ(ssize_t(WRITE_SIZE),
42*71db0c75SAndroid Build Coastguard Worker             LIBC_NAMESPACE::write(fd, WRITE_DATA, WRITE_SIZE));
43*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
44*71db0c75SAndroid Build Coastguard Worker 
45*71db0c75SAndroid Build Coastguard Worker   fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
46*71db0c75SAndroid Build Coastguard Worker   ASSERT_ERRNO_SUCCESS();
47*71db0c75SAndroid Build Coastguard Worker   ASSERT_GT(fd, 0);
48*71db0c75SAndroid Build Coastguard Worker   ASSERT_EQ(ssize_t(WRITE_SIZE), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));
49*71db0c75SAndroid Build Coastguard Worker   ASSERT_EQ(cpp::string_view(buf), cpp::string_view(WRITE_DATA));
50*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
51*71db0c75SAndroid Build Coastguard Worker 
52*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(LIBC_NAMESPACE::truncate(TEST_FILE, off_t(1)), Succeeds(0));
53*71db0c75SAndroid Build Coastguard Worker 
54*71db0c75SAndroid Build Coastguard Worker   fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
55*71db0c75SAndroid Build Coastguard Worker   ASSERT_ERRNO_SUCCESS();
56*71db0c75SAndroid Build Coastguard Worker   ASSERT_GT(fd, 0);
57*71db0c75SAndroid Build Coastguard Worker   ASSERT_EQ(ssize_t(1), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));
58*71db0c75SAndroid Build Coastguard Worker   ASSERT_EQ(buf[0], WRITE_DATA[0]);
59*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
60*71db0c75SAndroid Build Coastguard Worker 
61*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
62*71db0c75SAndroid Build Coastguard Worker }
63*71db0c75SAndroid Build Coastguard Worker 
TEST(LlvmLibcTruncateTest,TruncateNonExistentFile)64*71db0c75SAndroid Build Coastguard Worker TEST(LlvmLibcTruncateTest, TruncateNonExistentFile) {
65*71db0c75SAndroid Build Coastguard Worker   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
66*71db0c75SAndroid Build Coastguard Worker   ASSERT_THAT(
67*71db0c75SAndroid Build Coastguard Worker       LIBC_NAMESPACE::truncate("non-existent-dir/non-existent-file", off_t(1)),
68*71db0c75SAndroid Build Coastguard Worker       Fails(ENOENT));
69*71db0c75SAndroid Build Coastguard Worker }
70