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utils: add max_unsigned/min_unsigned helpers.

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We are usually dealing with unsigned values, so use this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-10-13 14:12:42 +10:30 committed by Christian Decker
parent 012dedc3d8
commit 2ab4e5b42b
3 changed files with 26 additions and 5 deletions
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4
bitcoin/script.c
View File

@ -12,8 +12,6 @@
/* To push 0-75 bytes onto stack. */
#define OP_PUSHBYTES(val) (val)
#define max(a, b) ((a) > (b) ? (a) : (b))
/* Bitcoin's OP_HASH160 is RIPEMD(SHA256()) */
static void hash160(struct ripemd160 *redeemhash, const void *mem, size_t len)
{
@ -556,7 +554,7 @@ u8 *bitcoin_wscript_to_local(const tal_t *ctx, u16 to_self_delay,
add_op(&script, OP_IF);
add_push_key(&script, revocation_pubkey);
add_op(&script, OP_ELSE);
add_number(&script, max(lease_remaining, to_self_delay));
add_number(&script, max_unsigned(lease_remaining, to_self_delay));
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_DROP);
add_push_key(&script, local_delayedkey);

24
common/utils.h
View File

@ -1,6 +1,7 @@
#ifndef LIGHTNING_COMMON_UTILS_H
#define LIGHTNING_COMMON_UTILS_H
#include "config.h"
#include <ccan/build_assert/build_assert.h>
#include <ccan/crypto/ripemd160/ripemd160.h>
#include <ccan/crypto/sha256/sha256.h>
#include <ccan/short_types/short_types.h>
@ -12,6 +13,29 @@ extern secp256k1_context *secp256k1_ctx;
extern const struct chainparams *chainparams;
/* Unsigned min/max macros: BUILD_ASSERT make sure types are unsigned */
#if HAVE_TYPEOF
#define MUST_BE_UNSIGNED_INT(x) BUILD_ASSERT_OR_ZERO((typeof(x))(-1)>=0)
#else
#define MUST_BE_UNSIGNED_INT(x) 0
#endif
#define min_unsigned(a, b) \
(MUST_BE_UNSIGNED_INT(a) + MUST_BE_UNSIGNED_INT(b) + min_u64((a), (b)))
#define max_unsigned(a, b) \
(MUST_BE_UNSIGNED_INT(a) + MUST_BE_UNSIGNED_INT(b) + max_u64((a), (b)))
static inline u64 min_u64(u64 a, u64 b)
{
return a < b ? a : b;
}
static inline u64 max_u64(u64 a, u64 b)
{
return a < b ? b : a;
}
/* Marker which indicates an (tal) pointer argument is stolen
* (i.e. eventually freed) by the function. Unlike TAKEN, which
* indicates it's only stolen if caller says take() */

3
onchaind/onchaind.c
View File

@ -23,7 +23,6 @@
/* stdin == requests */
#define REQ_FD STDIN_FILENO
#define HSM_FD 3
#define max(a, b) ((a) > (b) ? (a) : (b))
/* Required in various places: keys for commitment transaction. */
static const struct keyset *keyset;
@ -2837,7 +2836,7 @@ static void handle_our_unilateral(const struct tx_parts *tx,
our_unilateral_to_us(&outs, tx,
tx_blockheight,
i, amt,
max(to_self_delay[LOCAL], csv),
max_unsigned(to_self_delay[LOCAL], csv),
script[LOCAL],
local_wscript,
is_replay);