/* 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 ListFile lexer (CMakeLists.txt parser)

 *

 * This fuzzer targets cmListFileLexer which tokenizes CMakeLists.txt files.

 * It's a critical attack surface as malicious CMakeLists.txt files could be

 * encountered when building untrusted projects.

 *

 * Coverage targets:

 * - Token parsing (identifiers, strings, brackets, comments)

 * - BOM handling (UTF-8, UTF-16, UTF-32)

 * - Bracket argument/comment parsing

 * - Error recovery for malformed input

 */

#include <cstddef>

#include <cstdint>

#include "cmListFileLexer.h"

// Limit input size to avoid timeouts on complex inputs

static constexpr size_t kMaxInputSize = 64 * 1024; // 64KB

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

{

  // Skip overly large inputs

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

    return 0;

  }

  cmListFileLexer* lexer = cmListFileLexer_New();

  if (!lexer) {

    return 0;

  }

  // Parse from string (not file) for efficiency

  if (cmListFileLexer_SetString(lexer, reinterpret_cast<char const*>(data),

                                size)) {

    // Consume all tokens until EOF or error

    cmListFileLexer_Token* token;

    while ((token = cmListFileLexer_Scan(lexer)) != nullptr) {

      // Access token fields to ensure they're valid

      (void)token->type;

      (void)token->text;

      (void)token->length;

      (void)token->line;

      (void)token->column;

      // Get type as string for additional coverage

      (void)cmListFileLexer_GetTypeAsString(lexer, token->type);

    }

    // Exercise position tracking

    (void)cmListFileLexer_GetCurrentLine(lexer);

    (void)cmListFileLexer_GetCurrentColumn(lexer);

  }

  cmListFileLexer_Delete(lexer);

  return 0;

}