Cli: automatic splitting of server->client lines by newline

{

  va_list args;

  byte buf[CLI_LINE_SIZE];

  byte *head = alloca(10);

  int cd = code;

  int errcode;

  int size, cnt;

  int size, hsize;

  if (cd < 0)

    {

      cd = -cd;

      if (cd == c->last_reply)

	size = bsprintf(buf, " ");

	hsize = bsprintf(head, " ");

      else

	size = bsprintf(buf, "%04d-", cd);

	hsize = bsprintf(head, "%04d-", cd);

      errcode = -8000;

    }

  else if (cd == CLI_ASYNC_CODE)

    {

      size = 1; buf[0] = '+'; 

      hsize = 1; head[0] = '+';

      errcode = cd;

    }

  else

    {

      size = bsprintf(buf, "%04d ", cd);

      hsize = bsprintf(head, "%04d ", cd);

      errcode = 8000;

    }

  c->last_reply = cd;

  va_start(args, msg);

  cnt = bvsnprintf(buf+size, sizeof(buf)-size-1, msg, args);

  size = bvsnprintf(buf, sizeof(buf)-1, msg, args);

  va_end(args);

  if (cnt < 0)

  if (size < 0)

    {

      cli_printf(c, errcode, "<line overflow>");

      return;

    }

  size += cnt;

  buf[size++] = '\n';

  memcpy(cli_alloc_out(c, size), buf, size);

  buf[size] = 0;

  if (errcode == -8000) {

    /* Buffer may contain multiple lines, split them. */

    for (byte *b = buf, *e = strchr(buf, '\n'); e; b = e+1, e = strchr(b, '\n')) {

      byte *out = cli_alloc_out(c, (e - b) + hsize + 1);

      memcpy(out, head, hsize);

      memcpy(out+hsize, b, (e - b) + 1);

      head = " ";

      hsize = 1;

    }

  } else {

    /* Sanitize output for one-line versions of output. */

    for (byte *b = strchr(buf, '\n'); (b-buf) < size-1; b = strchr(b, '\n'))

      *b = '\t';

    /* Now the output is one-line, newlines transformed to tabs. */

    byte *out = cli_alloc_out(c, (size + hsize));

    memcpy(out, head, hsize);

    memcpy(out+hsize, buf, size);

  }

}

static void