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28 lines
673 B

#include "remove_dust.h"
#include <assert.h>
#include <stdbool.h>
#include <string.h>
void remove_dust(struct bitcoin_tx *tx, int *map)
{
size_t i, j, num = tx->output_count;
assert(tal_count(map) == num);
/* Do it in map order so we can remove from map, too */
for (i = 0; i < num; i++) {
assert(map[i] < tx->output_count);
if (tx->output[map[i]].amount >= DUST_THRESHOLD)
continue;
/* Eliminate that output from tx */
tx->output_count--;
memmove(tx->output + map[i], tx->output + map[i] + 1,
(tx->output_count-map[i]) * sizeof(*tx->output));
/* Fixup map. */
for (j = 0; j < num; j++)
if (map[j] > map[i])
map[j]--;
map[i] = -1;
}
}