Function xo_printf_v

tools/libxo/libxo/libxo.c:980–1011

* Print some data through the handle. */

 * Print some data through the handle.
 */
static ssize_t
xo_printf_v (xo_handle_t *xop, const char *fmt, va_list vap)
{
    xo_buffer_t *xbp = &xop->xo_data;
    ssize_t left = xbp->xb_size - (xbp->xb_curp - xbp->xb_bufp);
    ssize_t rc;
    va_list va_local;

    va_copy(va_local, vap);

    rc = vsnprintf(xbp->xb_curp, left, fmt, va_local);

    if (rc >= left) {
	if (!xo_buf_has_room(xbp, rc)) {
	    va_end(va_local);
	    return -1;
	}

	va_end(va_local);	/* Reset vap to the start */
	va_copy(va_local, vap);

	left = xbp->xb_size - (xbp->xb_curp - xbp->xb_bufp);
	rc = vsnprintf(xbp->xb_curp, left, fmt, va_local);
    }

    va_end(va_local);

    if (rc > 0)
	xbp->xb_curp += rc;

    return rc;
}

static ssize_t
xo_printf (xo_handle_t *xop, const char *fmt, ...)