core-lightning/find_p2sh_out.c
Rusty Russell 862509637b daemon: implement unilateral commit.
This is only for the simple case where there are no HTLCs.

We group the current commit information together in the struct;
this involves a trivial transform from peer->cur_commit_theirsig to
peer->cur_commit.theirsig.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2016-01-22 06:45:28 +10:30

26 lines
644 B
C

#include "bitcoin/script.h"
#include "bitcoin/tx.h"
#include "find_p2sh_out.h"
#include <ccan/err/err.h>
#include <ccan/tal/tal.h>
#include <string.h>
u32 find_p2sh_out(const struct bitcoin_tx *tx, u8 *redeemscript)
{
/* This is the scriptPubKey commit tx will have */
u8 *p2sh = scriptpubkey_p2sh(NULL, redeemscript);
u32 i;
for (i = 0; i < tx->output_count; i++) {
if (tx->output[i].script_length != tal_count(p2sh))
continue;
if (memcmp(tx->output[i].script, p2sh, tal_count(p2sh)) == 0)
break;
}
/* FIXME: Return failure! */
if (i == tx->output_count)
errx(1, "No matching output in tx");
tal_free(p2sh);
return i;
}