Merge "Relax integer limits in argument handling of native Zygote loop" into main am: 7f97613f

  }

  // Picky version of atoi(). No sign or unexpected characters allowed. Return -1 on failure.

  static int digitsVal(char* start, char* end) {

    constexpr int vmax = std::numeric_limits<int>::max();

    int result = 0;

    if (end - start > 6) {

      return -1;

    }

    for (char* dp = start; dp < end; ++dp) {

      if (*dp < '0' || *dp > '9') {

        ALOGW("Argument failed integer format check");

        ALOGW("Argument contains non-integer characters");

        return -1;

      }

      int digit = *dp - '0';

      if (result > vmax / 10) {

        ALOGW("Argument exceeds int limit");

        return -1;

      }

      result *= 10;

      if (result > vmax - digit) {

        ALOGW("Argument exceeds int limit");

        return -1;

      }

      result = 10 * result + (*dp - '0');

      result += digit;

    }

    return result;

  }