lightning/common/utils.h

#ifndef LIGHTNING_COMMON_UTILS_H
#define LIGHTNING_COMMON_UTILS_H
#include "config.h"
#include <ccan/crypto/ripemd160/ripemd160.h>
#include <ccan/crypto/sha256/sha256.h>
#include <ccan/short_types/short_types.h>
#include <ccan/structeq/structeq.h>
#include <ccan/tal/tal.h>
#include <secp256k1.h>

extern secp256k1_context *secp256k1_ctx;

/* Allocate and fill in a hex-encoded string of this data. */
char *tal_hexstr(const tal_t *ctx, const void *data, size_t len);

/* Allocate and fill a hex-encoding of this tal pointer. */
char *tal_hex(const tal_t *ctx, const tal_t *data);

/* Allocate and fill a buffer with the data of this hex string. */
u8 *tal_hexdata(const tal_t *ctx, const void *str, size_t len);

/* Helper macro to extend tal_arr and return pointer new last element. */
#if HAVE_STATEMENT_EXPR
/* More efficient version calls tal_count() once */
#define tal_arr_expand(p)					\
	({ size_t n = tal_count(*p); tal_resize((p), n+1); *(p) + n; })
#else
#define tal_arr_expand(p) \
	(tal_resize((p), tal_count(*(p))+1), (*p) + tal_count(*(p))-1)
#endif

/**
 * Remove an element from an array
 *
 * This will shift the elements past the removed element, changing
 * their position in memory, so only use this for arrays of pointers.
 */
#define tal_arr_remove(p, n) tal_arr_remove_((p), sizeof(**p), (n))
void tal_arr_remove_(void *p, size_t elemsize, size_t n);

/* Use the POSIX C locale. */
void setup_locale(void);

/* Global temporary convenience context: children freed in io loop core. */
extern const tal_t *tmpctx;

/* Initial creation of tmpctx. */
void setup_tmpctx(void);

/* Free any children of tmpctx. */
void clean_tmpctx(void);

/* Define sha256_eq. */
STRUCTEQ_DEF(sha256, 0, u);

/* Define ripemd160_eq. */
STRUCTEQ_DEF(ripemd160, 0, u);

#endif /* LIGHTNING_COMMON_UTILS_H */