format.hpp

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#pragma once
#ifndef LOGIT_CPP_HEADER_LOGIT_CPP_LOGIT_UTILS_FORMAT_HPP_INCLUDED
#define LOGIT_CPP_HEADER_LOGIT_CPP_LOGIT_UTILS_FORMAT_HPP_INCLUDED
 
 
#include <cstdarg>
#include <vector>
#include <string>
 
namespace logit {
 
    inline std::string format(const char *fmt, ...) {
        va_list args;
        va_start(args, fmt);
        std::vector<char> buffer(1024);
        for (;;) {
            va_list args_copy;
            va_copy(args_copy, args); // Copy args to prevent modifying the original list.
            int res = vsnprintf(buffer.data(), buffer.size(), fmt, args_copy);
            va_end(args_copy); // Clean up the copied argument list.
 
            if ((res >= 0) && (res < static_cast<int>(buffer.size()))) {
                va_end(args); // Clean up the original argument list.
                return std::string(buffer.data()); // Return the formatted string.
            }
 
            // If the buffer was too small, resize it.
            const size_t size = res < 0 ? buffer.size() * 2 : static_cast<size_t>(res) + 1;
            buffer.clear();
            buffer.resize(size);
        }
    }
 
}; // namespace logit
 
#endif // LOGIT_CPP_HEADER_LOGIT_CPP_LOGIT_UTILS_FORMAT_HPP_INCLUDED