60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include "withdraw_tx.h"
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#include <assert.h>
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#include <bitcoin/pubkey.h>
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#include <bitcoin/script.h>
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#include <ccan/ptrint/ptrint.h>
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#include <common/permute_tx.h>
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#include <common/utils.h>
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#include <common/utxo.h>
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#include <string.h>
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#include <wally_bip32.h>
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struct bitcoin_tx *withdraw_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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const struct utxo **utxos,
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struct bitcoin_tx_output **outputs,
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const struct pubkey *changekey,
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struct amount_sat change,
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const struct ext_key *bip32_base,
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int *change_outnum, u32 nlocktime)
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{
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struct bitcoin_tx *tx;
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int output_count;
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tx = tx_spending_utxos(ctx, chainparams, utxos, bip32_base,
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!amount_sat_eq(change, AMOUNT_SAT(0)),
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tal_count(outputs), nlocktime,
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BITCOIN_TX_DEFAULT_SEQUENCE - 1);
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output_count = bitcoin_tx_add_multi_outputs(tx, outputs);
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assert(output_count == tal_count(outputs));
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if (!amount_sat_eq(change, AMOUNT_SAT(0))) {
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/* Add one to the output_count, for the change */
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output_count++;
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const void *map[output_count];
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for (size_t i = 0; i < output_count; i++)
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map[i] = int2ptr(i);
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bitcoin_tx_add_output(tx, scriptpubkey_p2wpkh(tmpctx, changekey),
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change);
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assert(tx->wtx->num_outputs == output_count);
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permute_outputs(tx, NULL, map);
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/* The change is the last output added, so the last position
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* in the map */
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if (change_outnum)
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*change_outnum = ptr2int(map[output_count - 1]);
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} else if (change_outnum)
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*change_outnum = -1;
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permute_inputs(tx, (const void **)utxos);
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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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