Function xo_format_humanize

tools/libxo/libxo/libxo.c:3747–3800

* Format a "humanized" value for a numeric, meaning something nice * like "44M" instead of "44470272". We autoscale, choosing the * most appropriate value for K/M/G/T/P/E based on the value given. */

 * most appropriate value for K/M/G/T/P/E based on the value given.
 */
static void
xo_format_humanize (xo_handle_t *xop, xo_buffer_t *xbp,
		    xo_humanize_save_t *savep, xo_xff_flags_t flags)
{
    if (XOF_ISSET(xop, XOF_NO_HUMANIZE))
	return;

    ssize_t end_offset = xbp->xb_curp - xbp->xb_bufp;
    if (end_offset == savep->xhs_offset) /* Huh? Nothing to render */
	return;

    /*
     * We have a string that's allegedly a number. We want to
     * humanize it, which means turning it back into a number
     * and calling xo_humanize_number on it.
     */
    uint64_t value;
    char *ep;

    xo_buf_append(xbp, "", 1); /* NUL-terminate it */

    value = strtoull(xbp->xb_bufp + savep->xhs_offset, &ep, 0);
    if (!(value == ULLONG_MAX && errno == ERANGE)
	&& (ep != xbp->xb_bufp + savep->xhs_offset)) {
	/*
	 * There are few values where humanize_number needs
	 * more bytes than the original value.  I've used
	 * 10 as a rectal number to cover those scenarios.
	 */
	if (xo_buf_has_room(xbp, 10)) {
	    xbp->xb_curp = xbp->xb_bufp + savep->xhs_offset;

	    ssize_t rc;
	    ssize_t left = (xbp->xb_bufp + xbp->xb_size) - xbp->xb_curp;
	    int hn_flags = HN_NOSPACE; /* On by default */

	    if (flags & XFF_HN_SPACE)
		hn_flags &= ~HN_NOSPACE;

	    if (flags & XFF_HN_DECIMAL)
		hn_flags |= HN_DECIMAL;

	    if (flags & XFF_HN_1000)
		hn_flags |= HN_DIVISOR_1000;

	    rc = xo_humanize(xbp->xb_curp, left, value, hn_flags);
	    if (rc > 0) {
		xbp->xb_curp += rc;
		xop->xo_columns = savep->xhs_columns + rc;
		xop->xo_anchor_columns = savep->xhs_anchor_columns + rc;
	    }
	}
    }
}

/*
 * Convenience function that either append a fixed value (if one is