utf8_safe.h

Go to the documentation of this file.

// SPDX-License-Identifier: Apache-2.0
#pragma once
 
#include <string>
#include <cstddef>
 
namespace entropic::facade {
 
inline std::string utf8_safe_substr(const std::string& s, std::size_t max_bytes) {
    if (s.size() <= max_bytes) { return s; }
    std::size_t cut = max_bytes;
    while (cut > 0
           && (static_cast<unsigned char>(s[cut]) & 0xC0) == 0x80) {
        --cut;
    }
    return s.substr(0, cut);
}
 
} // namespace entropic::facade