// fuzz_config.cpp - libFuzzer harness for the .rc parser.
//
// Built and driven by tools/fuzz.py with clang++ -fsanitize=fuzzer. The
// parser is exercised on raw bytes through the same `parse_rc_stream` path
// used by the real init. `@import` is rejected inside the harness (the
// opener throws) so fuzz input can never open real files such as /dev/zero.
#include "../src/config.cpp"

#include <cstddef>
#include <cstdint>
#include <memory>
#include <sstream>
#include <string>
#include <vector>

namespace {

struct NoImports {
    std::unique_ptr<std::istream> operator()(const std::string&) const {
        throw std::runtime_error("fuzz: @import disabled");
    }
};

} // namespace

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
    const std::string text(reinterpret_cast<const char*>(data), size);
    bajia::Config cfg;
    std::vector<std::string> chain;
    std::vector<std::string> seen;
    try {
        std::istringstream in(text);
        bajia::parse_rc_stream(cfg, in, "/fuzz/main.rc", chain, seen,
                               NoImports{});
    } catch (const std::exception&) {
        // every parse error is a valid outcome; crashes are the bugs.
    }
    return 0;
}