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#include <vcpkg/base/checks.h>
#include <vcpkg/base/json.h>
#include <vcpkg/base/stringview.h>
#include <vcpkg/base/system.print.h>
#include <vcpkg/base/unicode.h>
#include <vcpkg/platform-expression.h>
#include <string.h>
#include <iostream>
#include <sstream>
#include <utility>
using namespace vcpkg;
namespace
{
enum class FuzzKind
{
None,
Utf8Decoder,
JsonParser,
PlatformExpr,
};
struct FuzzArgs
{
FuzzArgs(int argc, char** argv)
{
if (argc <= 1)
{
print_help_and_exit();
}
char** it = argv + 1; // skip the name of the program
char** last = argv + argc;
for (; it != last; ++it)
{
auto arg = StringView(*it, strlen(*it));
if (arg == "/?")
{
print_help_and_exit();
}
auto pr = split_arg(arg);
auto key = pr.first;
auto value = pr.second;
if (key == "h" || key == "help")
{
print_help_and_exit();
}
if (key == "kind")
{
if (value == "json")
{
kind = FuzzKind::JsonParser;
}
else if (value == "utf-8")
{
kind = FuzzKind::Utf8Decoder;
}
else if (value == "platform-expr")
{
kind = FuzzKind::PlatformExpr;
}
else
{
System::print2(System::Color::error, "Invalid kind: ", value, "\n");
System::print2(System::Color::error, " Expected one of: utf-8, json, platform-expr\n\n");
print_help_and_exit(true);
}
}
else
{
System::print2("Unknown option: ", key, "\n\n");
print_help_and_exit(true);
}
}
}
// returns {arg, ""} when there isn't an `=`
// skips preceding `-`s
std::pair<StringView, StringView> split_arg(StringView arg)
{
auto first = std::find_if(arg.begin(), arg.end(), [](char c) { return c != '-'; });
auto division = std::find(first, arg.end(), '=');
if (division == arg.end())
{
return {StringView(first, arg.end()), StringView(arg.end(), arg.end())};
}
else
{
return {StringView(first, division), StringView(division + 1, arg.end())};
}
}
[[noreturn]] void print_help_and_exit(bool invalid = false)
{
constexpr auto help =
R"(
Usage: vcpkg-fuzz <options>
Accepts input on stdin.
Options:
--kind=... One of {utf-8, json}
)";
auto color = invalid ? System::Color::error : System::Color::success;
System::print2(color, help);
if (invalid)
{
Checks::exit_fail(VCPKG_LINE_INFO);
}
else
{
Checks::exit_success(VCPKG_LINE_INFO);
}
}
FuzzKind kind;
};
std::string read_all_of_stdin()
{
std::stringstream ss;
ss << std::cin.rdbuf();
return std::move(ss).str();
}
[[noreturn]] void fuzz_json_and_exit(StringView text)
{
auto res = Json::parse(text);
if (!res)
{
Checks::exit_with_message(VCPKG_LINE_INFO, res.error()->format());
}
Checks::exit_success(VCPKG_LINE_INFO);
}
[[noreturn]] void fuzz_utf8_and_exit(StringView text)
{
auto res = Unicode::Utf8Decoder(text.begin(), text.end());
for (auto ch : res)
{
(void)ch;
}
Checks::exit_success(VCPKG_LINE_INFO);
}
[[noreturn]] void fuzz_platform_expr_and_exit(StringView text)
{
auto res1 =
PlatformExpression::parse_platform_expression(text, PlatformExpression::MultipleBinaryOperators::Deny);
auto res2 =
PlatformExpression::parse_platform_expression(text, PlatformExpression::MultipleBinaryOperators::Allow);
if (!res1)
{
Checks::exit_with_message(VCPKG_LINE_INFO, res1.error());
}
if (!res2)
{
Checks::exit_with_message(VCPKG_LINE_INFO, res2.error());
}
Checks::exit_success(VCPKG_LINE_INFO);
}
}
int main(int argc, char** argv)
{
auto args = FuzzArgs(argc, argv);
if (args.kind == FuzzKind::None)
{
args.print_help_and_exit(true);
}
auto text = read_all_of_stdin();
switch (args.kind)
{
case FuzzKind::JsonParser: fuzz_json_and_exit(text);
case FuzzKind::Utf8Decoder: fuzz_utf8_and_exit(text);
case FuzzKind::PlatformExpr: fuzz_platform_expr_and_exit(text);
default: Checks::unreachable(VCPKG_LINE_INFO);
}
}
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