Method pwrite

KittyMemoryEx/KittyIOFile.cpp:107–132

}

ssize_t KittyIOFile::pwrite(uintptr_t offset, const void *buffer, size_t len)
{
    _error = 0;

    if (_fd < 0)
        return -1;

    const char *ptr = static_cast<const char *>(buffer);
    size_t total = 0;
    while (total < len)
    {
        size_t toWrite = std::min(len - total, _bufferSize);
#ifdef __APPLE__
        ssize_t n = KT_EINTR_RETRY(::pwrite(_fd, ptr + total, toWrite, (off_t)(offset + total)));
#else
        ssize_t n = KT_EINTR_RETRY(::pwrite64(_fd, ptr + total, toWrite, (off64_t)(offset + total)));
#endif
        if (n <= 0)
        {
            _error = (n < 0) ? errno : 0;
            return total > 0 ? total : -1;
        }
        total += n;
    }
    return total;
}

bool KittyIOFile::readToString(std::string *str)
{