Function xo_anchor_start

tools/libxo/libxo/libxo.c:5230–5247

* An anchor is a marker used to delay field width implications. * Imagine the format string "{[:10}{min:%d}/{cur:%d}/{max:%d}{:]}". * We are looking for output like " 1/4/5" * * To make this work, we record the anchor and then return to * format it when the end anchor tag is seen. */

 * format it when the end anchor tag is seen.
 */
static void
xo_anchor_start (xo_handle_t *xop, xo_field_info_t *xfip,
		 const char *value, ssize_t vlen)
{
    if (XOIF_ISSET(xop, XOIF_ANCHOR))
	xo_failure(xop, "the anchor already recording is discarded");

    XOIF_SET(xop, XOIF_ANCHOR);
    xo_buffer_t *xbp = &xop->xo_data;
    xop->xo_anchor_offset = xbp->xb_curp - xbp->xb_bufp;
    xop->xo_anchor_columns = 0;

    /*
     * Now we find the width, if possible.  If it's not there,
     * we'll get it on the end anchor.
     */
    xop->xo_anchor_min_width = xo_find_width(xop, xfip, value, vlen);
}

static void
xo_anchor_stop (xo_handle_t *xop, xo_field_info_t *xfip,