Function invoice_for_invreq

common/bolt12.c:798–824

* Prepare a new invoice based on an invoice_request. */

 * Prepare a new invoice based on an invoice_request.
 */
struct tlv_invoice *invoice_for_invreq(const tal_t *ctx,
				       const struct tlv_invoice_request *invreq)
{
	const u8 *cursor;
	size_t start1, len1, start2, len2;
	u8 *wire = tal_arr(tmpctx, u8, 0);

	towire_tlv_invoice_request(&wire, invreq);

	/* BOLT #12:
	 * A writer of an invoice:
	 *...
	 * - if the invoice is in response to an `invoice_request`:
	 *   - MUST copy all non-signature fields from the invoice request (including
	 *     unknown fields).
	 */
	len1 = tlv_span(wire, 0, 159, &start1);
	len2 = tlv_span(wire, 1000000000, 2999999999, &start2);

	/* Move second span adjacent first span */
	memmove(wire + start1 + len1, wire + start2, len2);

	/* Unmarshal combined result */
	len1 = len1 + len2;
	cursor = wire + start1;
	return fromwire_tlv_invoice(ctx, &cursor, &len1);
}

bool is_bolt12_signature_field(u64 typenum)
{