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/*
* Copyright (c) 2020, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/ByteBuffer.h>
#include <AK/Random.h>
#include <AK/StringBuilder.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
struct Testcase {
const char* dest;
size_t dest_n;
const char* src;
size_t src_n;
const char* dest_expected;
size_t dest_expected_n; // == dest_n
};
static String show(const ByteBuffer& buf)
{
StringBuilder builder;
for (size_t i = 0; i < buf.size(); ++i) {
builder.appendff("{:02x}", buf[i]);
}
builder.append(' ');
builder.append('(');
for (size_t i = 0; i < buf.size(); ++i) {
if (isprint(buf[i]))
builder.append(buf[i]);
else
builder.append('_');
}
builder.append(')');
return builder.build();
}
static bool test_single(const Testcase& testcase)
{
constexpr size_t SANDBOX_CANARY_SIZE = 8;
// Preconditions:
if (testcase.dest_n != testcase.dest_expected_n) {
warnln("dest length {} != expected dest length {}? Check testcase! (Probably miscounted.)", testcase.dest_n, testcase.dest_expected_n);
return false;
}
if (testcase.src_n != strlen(testcase.src)) {
warnln("src length {} != actual src length {}? src can't contain NUL bytes!", testcase.src_n, strlen(testcase.src));
return false;
}
// Setup
ByteBuffer actual = ByteBuffer::create_uninitialized(SANDBOX_CANARY_SIZE + testcase.dest_n + SANDBOX_CANARY_SIZE);
fill_with_random(actual.data(), actual.size());
ByteBuffer expected = actual;
VERIFY(actual.offset_pointer(0) != expected.offset_pointer(0));
actual.overwrite(SANDBOX_CANARY_SIZE, testcase.dest, testcase.dest_n);
expected.overwrite(SANDBOX_CANARY_SIZE, testcase.dest_expected, testcase.dest_expected_n);
// "unsigned char" != "char", so we have to convince the compiler to allow this.
char* dst = reinterpret_cast<char*>(actual.offset_pointer(SANDBOX_CANARY_SIZE));
// The actual call:
size_t actual_return = strlcpy(dst, testcase.src, testcase.dest_n);
// Checking the results:
bool return_ok = actual_return == testcase.src_n;
bool canary_1_ok = actual.slice(0, SANDBOX_CANARY_SIZE) == expected.slice(0, SANDBOX_CANARY_SIZE);
bool main_ok = actual.slice(SANDBOX_CANARY_SIZE, testcase.dest_n) == expected.slice(SANDBOX_CANARY_SIZE, testcase.dest_n);
bool canary_2_ok = actual.slice(SANDBOX_CANARY_SIZE + testcase.dest_n, SANDBOX_CANARY_SIZE) == expected.slice(SANDBOX_CANARY_SIZE + testcase.dest_n, SANDBOX_CANARY_SIZE);
bool buf_ok = actual == expected;
// Evaluate gravity:
if (buf_ok && (!canary_1_ok || !main_ok || !canary_2_ok)) {
warnln("Internal error! ({} != {} | {} | {})", buf_ok, canary_1_ok, main_ok, canary_2_ok);
buf_ok = false;
}
if (!canary_1_ok) {
warnln("Canary 1 overwritten: Expected canary {}\n"
" instead got {}",
show(expected.slice(0, SANDBOX_CANARY_SIZE)),
show(actual.slice(0, SANDBOX_CANARY_SIZE)));
}
if (!main_ok) {
warnln("Wrong output: Expected {}\n"
" instead got {}",
show(expected.slice(SANDBOX_CANARY_SIZE, testcase.dest_n)),
show(actual.slice(SANDBOX_CANARY_SIZE, testcase.dest_n)));
}
if (!canary_2_ok) {
warnln("Canary 2 overwritten: Expected {}\n"
" instead got {}",
show(expected.slice(SANDBOX_CANARY_SIZE + testcase.dest_n, SANDBOX_CANARY_SIZE)),
show(actual.slice(SANDBOX_CANARY_SIZE + testcase.dest_n, SANDBOX_CANARY_SIZE)));
}
if (!return_ok) {
warnln("Wrong return value: Expected {}, got {} instead!", testcase.src_n, actual_return);
}
return buf_ok && return_ok;
}
// Drop the NUL terminator added by the C++ compiler.
#define LITERAL(x) x, (sizeof(x) - 1)
TEST_CASE(golden_path)
{
EXPECT(test_single({ LITERAL("Hello World!\0\0\0"), LITERAL("Hello Friend!"), LITERAL("Hello Friend!\0\0") }));
EXPECT(test_single({ LITERAL("Hello World!\0\0\0"), LITERAL("Hello Friend!"), LITERAL("Hello Friend!\0\0") }));
EXPECT(test_single({ LITERAL("aaaaaaaaaa"), LITERAL("whf"), LITERAL("whf\0aaaaaa") }));
}
TEST_CASE(exact_fit)
{
EXPECT(test_single({ LITERAL("Hello World!\0\0"), LITERAL("Hello Friend!"), LITERAL("Hello Friend!\0") }));
EXPECT(test_single({ LITERAL("AAAA"), LITERAL("aaa"), LITERAL("aaa\0") }));
}
TEST_CASE(off_by_one)
{
EXPECT(test_single({ LITERAL("AAAAAAAAAA"), LITERAL("BBBBB"), LITERAL("BBBBB\0AAAA") }));
EXPECT(test_single({ LITERAL("AAAAAAAAAA"), LITERAL("BBBBBBBCC"), LITERAL("BBBBBBBCC\0") }));
EXPECT(test_single({ LITERAL("AAAAAAAAAA"), LITERAL("BBBBBBBCCX"), LITERAL("BBBBBBBCC\0") }));
EXPECT(test_single({ LITERAL("AAAAAAAAAA"), LITERAL("BBBBBBBCCXY"), LITERAL("BBBBBBBCC\0") }));
}
TEST_CASE(nearly_empty)
{
EXPECT(test_single({ LITERAL(""), LITERAL(""), LITERAL("") }));
EXPECT(test_single({ LITERAL(""), LITERAL("Empty test"), LITERAL("") }));
EXPECT(test_single({ LITERAL("x"), LITERAL(""), LITERAL("\0") }));
EXPECT(test_single({ LITERAL("xx"), LITERAL(""), LITERAL("\0x") }));
EXPECT(test_single({ LITERAL("x"), LITERAL("y"), LITERAL("\0") }));
}
static char* const POISON = (char*)1;
TEST_CASE(to_nullptr)
{
EXPECT_EQ(0u, strlcpy(POISON, "", 0));
EXPECT_EQ(1u, strlcpy(POISON, "x", 0));
EXPECT(test_single({ LITERAL("Hello World!\0\0\0"), LITERAL("Hello Friend!"), LITERAL("Hello Friend!\0\0") }));
EXPECT(test_single({ LITERAL("aaaaaaaaaa"), LITERAL("whf"), LITERAL("whf\0aaaaaa") }));
}
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