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/*
* libfud
* Copyright 2024 Dominick Allen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FUD_C_STRING_HPP
#define FUD_C_STRING_HPP
#include <climits>
#include <cstddef>
#include <limits>
#include <sys/types.h>
namespace fud {
constexpr ssize_t MAX_C_STRING_LENGTH = std::numeric_limits<ssize_t>::max() - 1;
constexpr ssize_t cStringLength(const char* str, size_t maxLength)
{
if (str == nullptr || maxLength > MAX_C_STRING_LENGTH) {
return -1;
}
ssize_t size = 0;
while (str[size] != 0 && static_cast<size_t>(size) < maxLength) {
size++;
}
if (str[size] != 0 && static_cast<size_t>(size) == maxLength) {
return static_cast<ssize_t>(maxLength) + 1;
}
return size;
}
constexpr ssize_t cStringLength(const char* str)
{
return cStringLength(str, MAX_C_STRING_LENGTH);
}
constexpr ssize_t cStringLength(const char8_t* str, size_t maxLength)
{
// Cannot cast str to const char* without breaking constexpr
// return cStringLength(reinterpret_cast<const char*>(str), maxLength);
if (str == nullptr || maxLength > MAX_C_STRING_LENGTH) {
return -1;
}
ssize_t size = 0;
while (str[size] != 0 && static_cast<size_t>(size) < maxLength) {
size++;
}
if (str[size] != 0 && static_cast<size_t>(size) == maxLength) {
return static_cast<ssize_t>(maxLength) + 1;
}
return size;
}
constexpr ssize_t cStringLength(const char8_t* str)
{
return cStringLength(str, MAX_C_STRING_LENGTH);
}
} // namespace fud
#endif
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