buffer_pretty_print.cpp

constexpr size_t bytes_per_line = 16;

void buffer_pretty_print(const void *buf, size_t size) {
    uintptr_t addr = reinterpret_cast<uintptr_t>(buf);

    for (size_t i = 0; i < (size + bytes_per_line - 1) / bytes_per_line; i++) {
        uint8_t buf[bytes_per_line];
        auto off = i * bytes_per_line;
        size_t n = std::min(bytes_per_line, size - off);
        std::memcpy(
            buf,
            reinterpret_cast<const void *>(addr + off),
            n
        );

        printf(" %016lx: ", addr + off);

        for (size_t j = 0; j < n; j++)
            printf("%02hhx ", buf[j]);
        for (size_t j = 0; j < bytes_per_line - n; j++)
            printf("   ");

        for (auto &c : buf)
            c = std::isprint(c) ? c : '.';

        printf("| %.*s\n", static_cast<int>(n), buf);
    }
}