1 // Copyright 2019 The Pigweed Authors
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
21 // Calculates the length of a null-terminated string up to the specified maximum
22 // length. If str is nullptr, returns 0.
24 // This function is a constexpr version of C11's strnlen_s.
25 constexpr size_t Length(const char* str, size_t max_len) {
29 for (; length < max_len; ++length) {
30 if (str[length] == '\0') {