Function print_offer_amount

devtools/bolt12-cli.c:89–160

}

static bool print_offer_amount(const struct bitcoin_blkid *chains,
			       const char *iso4217, u64 amount)
{
	const char *currency;
	unsigned int minor_unit;
	bool ok = true;

	/* BOLT #12:
	 * - if a specific minimum `offer_amount` is required for successful payment:
	 *   - MUST set `offer_amount` to the amount expected (per item).
	 *   - MUST set `offer_amount` greater than zero.
	 *   - if the currency for `offer_amount` is that of all entries in `chains`:
	 *     - MUST specify `offer_amount` in multiples of the minimum lightning-payable unit
	 *       (e.g. milli-satoshis for bitcoin).
	 *   - otherwise:
	 *     - MUST specify `offer_currency` `iso4217` as an ISO 4217 three-letter code.
	 *     - MUST specify `offer_amount` in the currency unit adjusted by the ISO 4217
	 *       exponent (e.g. USD cents).
	 *   - MUST set `offer_description` to a complete description of the purpose
	 *       of the payment.
	 * - otherwise:
	 *   - MUST NOT set `offer_amount`
	 *   - MUST NOT set `offer_currency`
	 *   - MAY set `offer_description`
	 */
	if (!iso4217) {
		if (tal_count(chains) == 0)
			currency = "bc";
		else {
			const struct chainparams *ch;

			ch = chainparams_by_chainhash(&chains[0]);
			if (!ch) {
				currency = tal_fmt(tmpctx, "UNKNOWN CHAINHASH %s",
						   fmt_bitcoin_blkid(tmpctx,
								     &chains[0]));
				ok = false;
			} else
				currency = ch->lightning_hrp;
		}
		minor_unit = 11;
	} else {
		const struct iso4217_name_and_divisor *iso;
		iso = find_iso4217(iso4217, tal_bytelen(iso4217));
		if (iso) {
			minor_unit = iso->minor_unit;
			currency = iso->name;
		} else {
			minor_unit = 0;
			currency = tal_fmt(tmpctx, "%.*s (UNKNOWN CURRENCY)",
					   (int)tal_bytelen(iso4217), iso4217);
			ok = false;
		}
	}

	if (!minor_unit)
		printf("offer_amount: %"PRIu64"%s\n", amount, currency);
	else {