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2aad3ffcf8
This is a common thing to do, so create a macro. Unfortunately, it still needs the type arg, because the paramter may be const, and the return cannot be, and C doesn't have a general "(-const)" cast. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#include "bitcoin/script.h"
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#include "bitcoin/tx.h"
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#include "close_tx.h"
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#include "permute_tx.h"
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#include <assert.h>
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#include <common/utils.h>
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struct bitcoin_tx *create_close_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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const u8 *our_script,
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const u8 *their_script,
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const struct bitcoin_txid *anchor_txid,
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unsigned int anchor_index,
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struct amount_sat funding,
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struct amount_sat to_us,
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struct amount_sat to_them,
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struct amount_sat dust_limit)
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{
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struct bitcoin_tx *tx;
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size_t num_outputs = 0;
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struct amount_sat total_out;
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u8 *script;
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assert(amount_sat_add(&total_out, to_us, to_them));
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assert(amount_sat_less_eq(total_out, funding));
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/* BOLT #3:
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*
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* ## Closing Transaction
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*
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* Note that there are two possible variants for each node.
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*
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* * version: 2
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* * locktime: 0
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* * txin count: 1
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*/
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/* Now create close tx: one input, two outputs. */
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tx = bitcoin_tx(ctx, chainparams, 1, 2, 0);
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/* Our input spends the anchor tx output. */
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bitcoin_tx_add_input(tx, anchor_txid, anchor_index,
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BITCOIN_TX_DEFAULT_SEQUENCE, funding, NULL);
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if (amount_sat_greater_eq(to_us, dust_limit)) {
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script = tal_dup_talarr(tx, u8, our_script);
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/* One output is to us. */
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bitcoin_tx_add_output(tx, script, to_us);
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num_outputs++;
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}
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if (amount_sat_greater_eq(to_them, dust_limit)) {
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script = tal_dup_talarr(tx, u8, their_script);
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/* Other output is to them. */
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bitcoin_tx_add_output(tx, script, to_them);
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num_outputs++;
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}
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/* Can't have no outputs at all! */
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if (num_outputs == 0)
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return tal_free(tx);
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permute_outputs(tx, NULL, NULL);
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elements_tx_add_fee_output(tx);
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assert(bitcoin_tx_check(tx));
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return tx;
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}
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