Function StringToIntegerImpl

native/thirdpart/flatbuffers/util.h:294–318

// range error occurs. In this case value MAX(T)/MIN(T) is returned.
template<typename T>
inline bool StringToIntegerImpl(T *val, const char *const str,
                                const int base = 0,
                                const bool check_errno = true) {
  // T is int64_t or uint64_T
  FLATBUFFERS_ASSERT(str);
  if (base <= 0) {
    auto s = str;
    while (*s && !is_digit(*s)) s++;
    if (s[0] == '0' && is_alpha_char(s[1], 'X'))
      return StringToIntegerImpl(val, str, 16, check_errno);
    // if a prefix not match, try base=10
    return StringToIntegerImpl(val, str, 10, check_errno);
  } else {
    if (check_errno) errno = 0;  // clear thread-local errno
    auto endptr = str;
    strtoval_impl(val, str, const_cast<char **>(&endptr), base);
    if ((*endptr != '\0') || (endptr == str)) {
      *val = 0;      // erase partial result
      return false;  // invalid string
    }
    // errno is out-of-range, return MAX/MIN
    if (check_errno && errno) return false;
    return true;
  }
}

template<typename T>
inline bool StringToFloatImpl(T *val, const char *const str) {