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libsecp256k1/src/util.h  view on Meta::CPAN

            printf("\n    ");
        } else {
            printf(" ");
        }
        printf("0x%02X,", buf[i]);
    }
    printf("\n}\n");
}

# if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
#  if SECP256K1_GNUC_PREREQ(2,7)
#   define SECP256K1_INLINE __inline__
#  elif (defined(_MSC_VER))
#   define SECP256K1_INLINE __inline
#  else
#   define SECP256K1_INLINE
#  endif
# else
#  define SECP256K1_INLINE inline
# endif

/** Assert statically that expr is true.
 *
 * This is a statement-like macro and can only be used inside functions.
 */
#define STATIC_ASSERT(expr) do { \
    switch(0) { \
        case 0: \
        /* If expr evaluates to 0, we have two case labels "0", which is illegal. */ \
        case /* ERROR: static assertion failed */ (expr): \
        ; \
    } \
} while(0)

/** Assert statically that expr is an integer constant expression, and run stmt.
 *
 * Useful for example to enforce that magnitude arguments are constant.
 */
#define ASSERT_INT_CONST_AND_DO(expr, stmt) do { \
    switch(42) { \
        /* C allows only integer constant expressions as case labels. */ \
        case /* ERROR: integer argument is not constant */ (expr): \
            break; \
        default: ; \
    } \
    stmt; \
} while(0)

typedef struct {
    void (*fn)(const char *text, void* data);
    const void* data;
} secp256k1_callback;

static SECP256K1_INLINE void secp256k1_callback_call(const secp256k1_callback * const cb, const char * const text) {
    cb->fn(text, (void*)cb->data);
}

#ifndef USE_EXTERNAL_DEFAULT_CALLBACKS
static void secp256k1_default_illegal_callback_fn(const char* str, void* data) {
    (void)data;
    fprintf(stderr, "[libsecp256k1] illegal argument: %s\n", str);
    abort();
}
static void secp256k1_default_error_callback_fn(const char* str, void* data) {
    (void)data;
    fprintf(stderr, "[libsecp256k1] internal consistency check failed: %s\n", str);
    abort();
}
#else
void secp256k1_default_illegal_callback_fn(const char* str, void* data);
void secp256k1_default_error_callback_fn(const char* str, void* data);
#endif

static const secp256k1_callback default_illegal_callback = {
    secp256k1_default_illegal_callback_fn,
    NULL
};

static const secp256k1_callback default_error_callback = {
    secp256k1_default_error_callback_fn,
    NULL
};


#ifdef DETERMINISTIC
#define TEST_FAILURE(msg) do { \
    fprintf(stderr, "%s\n", msg); \
    abort(); \
} while(0);
#else
#define TEST_FAILURE(msg) do { \
    fprintf(stderr, "%s:%d: %s\n", __FILE__, __LINE__, msg); \
    abort(); \
} while(0)
#endif

#if SECP256K1_GNUC_PREREQ(3, 0)
#define EXPECT(x,c) __builtin_expect((x),(c))
#else
#define EXPECT(x,c) (x)
#endif

#ifdef DETERMINISTIC
#define CHECK(cond) do { \
    if (EXPECT(!(cond), 0)) { \
        TEST_FAILURE("test condition failed"); \
    } \
} while(0)
#else
#define CHECK(cond) do { \
    if (EXPECT(!(cond), 0)) { \
        TEST_FAILURE("test condition failed: " #cond); \
    } \
} while(0)
#endif

/* Like assert(), but when VERIFY is defined. */
#if defined(VERIFY)
#define VERIFY_CHECK CHECK
#else
#define VERIFY_CHECK(cond)
#endif

static SECP256K1_INLINE void *checked_malloc(const secp256k1_callback* cb, size_t size) {
    void *ret = malloc(size);
    if (ret == NULL) {
        secp256k1_callback_call(cb, "Out of memory");
    }
    return ret;
}

#if defined(__BIGGEST_ALIGNMENT__)
#define ALIGNMENT __BIGGEST_ALIGNMENT__
#else
/* Using 16 bytes alignment because common architectures never have alignment
 * requirements above 8 for any of the types we care about. In addition we
 * leave some room because currently we don't care about a few bytes. */
#define ALIGNMENT 16
#endif

/* ceil(x/y) for integers x > 0 and y > 0. Here, / denotes rational division. */
#define CEIL_DIV(x, y) (1 + ((x) - 1) / (y))

#define ROUND_TO_ALIGN(size) (CEIL_DIV(size, ALIGNMENT) * ALIGNMENT)

/* Macro for restrict, when available and not in a VERIFY build. */
#if defined(SECP256K1_BUILD) && defined(VERIFY)
# define SECP256K1_RESTRICT
#else
# if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
#  if SECP256K1_GNUC_PREREQ(3,0)
#   define SECP256K1_RESTRICT __restrict__