/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

/*

 * Fuzzer for CMake's math expression parser

 *

 * The math() command uses cmExprParserHelper to evaluate mathematical

 * expressions. This fuzzer tests the expression parser for crashes,

 * hangs, and undefined behavior.

 *

 * Coverage targets:

 * - Integer arithmetic parsing

 * - Operator precedence handling

 * - Parentheses nesting

 * - Error handling for invalid expressions

 */

#include <cstddef>

#include <cstdint>

#include <string>

#include "cmExprParserHelper.h"

// Limit input size to prevent DoS via deeply nested expressions

static constexpr size_t kMaxInputSize = 4096;

extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)

{

  if (size == 0 || size > kMaxInputSize) {

    return 0;

  }

  // Create null-terminated string

  std::string input(reinterpret_cast<char const*>(data), size);

  cmExprParserHelper helper;

  // Parse with different verbosity levels

  int result = helper.ParseString(input.c_str(), 0);

  (void)result;

  // Always check result and error accessors

  (void)helper.GetResult();

  (void)helper.GetError();

  (void)helper.GetWarning();

  return 0;

}