Method fread

src/api/InkAPIInternal.cc:361–412

}

ssize_t
FileImpl::fread(void *buf, size_t length)
{
  size_t  amount;
  ssize_t err;

  if ((m_mode != READ) || (m_fd == -1)) {
    return -1;
  }

  if (!m_buf) {
    m_bufpos  = 0;
    m_bufsize = 1024;
    m_buf     = (char *)ats_malloc(m_bufsize);
  }

  if (m_bufpos < length) {
    amount = length;
    if (amount < 1024) {
      amount = 1024;
    }
    if (amount > (m_bufsize - m_bufpos)) {
      while (amount > (m_bufsize - m_bufpos)) {
        m_bufsize *= 2;
      }
      m_buf = (char *)ats_realloc(m_buf, m_bufsize);
    }

    do {
      err = read(m_fd, &m_buf[m_bufpos], amount);
    } while ((err < 0) && (errno == EINTR));

    if (err < 0) {
      return -1;
    }

    m_bufpos += err;
  }

  if (buf) {
    amount = length;
    if (amount > m_bufpos) {
      amount = m_bufpos;
    }
    memcpy(buf, m_buf, amount);
    memmove(m_buf, &m_buf[amount], m_bufpos - amount);
    m_bufpos -= amount;
    return amount;
  } else {
    return m_bufpos;
  }
}

ssize_t
FileImpl::fwrite(const void *buf, size_t length)