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//===-- Unittests for strncat ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/string/strncat.h"
#include "test/UnitTest/Test.h"
TEST(LlvmLibcStrNCatTest, EmptyDest) {
const char *abc = "abc";
char dest[4];
dest[0] = '\0';
// Start by copying nothing
char *result = LIBC_NAMESPACE::strncat(dest, abc, 0);
ASSERT_EQ(dest, result);
ASSERT_EQ(dest[0], '\0');
// Then copy part of it.
result = LIBC_NAMESPACE::strncat(dest, abc, 1);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "a");
// Reset for the last test.
dest[0] = '\0';
// Then copy all of it.
result = LIBC_NAMESPACE::strncat(dest, abc, 3);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, result);
ASSERT_STREQ(dest, abc);
}
TEST(LlvmLibcStrNCatTest, NonEmptyDest) {
const char *abc = "abc";
char dest[7];
dest[0] = 'x';
dest[1] = 'y';
dest[2] = 'z';
dest[3] = '\0';
// Copy only part of the string onto the end
char *result = LIBC_NAMESPACE::strncat(dest, abc, 1);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "xyza");
// Copy a bit more, but without resetting.
result = LIBC_NAMESPACE::strncat(dest, abc, 2);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "xyzaab");
// Set just the end marker, to make sure it overwrites properly.
dest[3] = '\0';
result = LIBC_NAMESPACE::strncat(dest, abc, 3);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "xyzabc");
// Check that copying still works when count > src length
dest[0] = '\0';
// And that it doesn't write beyond what is necessary.
dest[4] = 'Z';
result = LIBC_NAMESPACE::strncat(dest, abc, 4);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "abc");
ASSERT_EQ(dest[4], 'Z');
result = LIBC_NAMESPACE::strncat(dest, abc, 5);
ASSERT_EQ(dest, result);
ASSERT_STREQ(dest, "abcabc");
}
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