Function xo_do_emit_fields

tools/libxo/libxo/libxo.c:6284–6505

* Emit a set of fields. This is really the core of libxo. */

 * Emit a set of fields.  This is really the core of libxo.
 */
static ssize_t
xo_do_emit_fields (xo_handle_t *xop, xo_field_info_t *fields,
		   unsigned max_fields, const char *fmt)
{
    int gettext_inuse = 0;
    int gettext_changed = 0;
    int gettext_reordered = 0;
    unsigned ftype;
    xo_xff_flags_t flags;
    xo_field_info_t *new_fields = NULL;
    xo_field_info_t *xfip;
    unsigned field;
    ssize_t rc = 0;

    int flush = XOF_ISSET(xop, XOF_FLUSH);
    int flush_line = XOF_ISSET(xop, XOF_FLUSH_LINE);
    char *new_fmt = NULL;

    if (XOIF_ISSET(xop, XOIF_REORDER) || xo_style(xop) == XO_STYLE_ENCODER)
	flush_line = 0;

    /*
     * Some overhead for gettext; if the fields in the msgstr returned
     * by gettext are reordered, then we need to record start and end
     * for each field.  We'll go ahead and render the fields in the
     * normal order, but later we can then reconstruct the reordered
     * fields using these fstart/fend values.
     */
    unsigned flimit = max_fields * 2; /* Pessimistic limit */
    unsigned min_fstart = flimit - 1;
    unsigned max_fend = 0;	      /* Highest recorded fend[] entry */
    ssize_t fstart[flimit];
    bzero(fstart, flimit * sizeof(fstart[0]));
    ssize_t fend[flimit];
    bzero(fend, flimit * sizeof(fend[0]));

    for (xfip = fields, field = 0; field < max_fields && xfip->xfi_ftype;
	 xfip++, field++) {
	ftype = xfip->xfi_ftype;
	flags = xfip->xfi_flags;

	/* Record field start offset */
	if (gettext_reordered) {
	    fstart[field] = xo_buf_offset(&xop->xo_data);
	    if (min_fstart > field)
		min_fstart = field;
	}

	const char *content = xfip->xfi_content;
	ssize_t clen = xfip->xfi_clen;

	if (flags & XFF_ARGUMENT) {
	    /*
	     * Argument flag means the content isn't given in the descriptor,
	     * but as a UTF-8 string ('const char *') argument in xo_vap.
	     */
	    content = va_arg(xop->xo_vap, char *);
	    clen = content ? strlen(content) : 0;