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mmath

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math library for metric sequences and binary arrays.

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mmath c_src mmath.h
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c_src/mmath.h 

#if defined(__linux__)

#  define __USE_BSD

#  include <stdint.h>

#  include <endian.h>

#  define htonll(v) htobe64(v)

#  define ntohll(v) be64toh(v)

/* On modern Os X'es (>= 10.10) htonll is defined in machine/endian.h, but on older it is missing */

#elif defined(__APPLE__) && !defined(htonll)

#  include <libkern/OSByteOrder.h>

#  define htonll(v) OSSwapHostToBigInt64(v)

#  define ntohll(v) OSSwapBigToHostInt64(v)

#elif defined(SOLARIS)

#  include <sys/byteorder.h>

#endif



typedef struct {

    int64_t coefficient;

    int8_t exponent;

} decimal;



#define DDB_ZERO htonll(0x0100000000000000LL)

#define IS_SET(v) ((ntohll(v) & 0xFF00000000000000LL) != 0LL)

#define FROM_DDB(v) dec_deserialize(v)

#define TO_DDB(v) dec_serialize(v)



#define GET_CHUNK(chunk)                                                \

  if (!enif_get_int64(env, argv[1], &chunk))                            \

    return enif_make_badarg(env);                                       \

  if (chunk < 1)                                                        \

    return enif_make_badarg(env)



#define GET_BIN(pos, bin, count, vs)              \

  if (!enif_inspect_binary(env, argv[pos], &bin)) \

    return enif_make_badarg(env);                 \

  if (bin.size % sizeof(__typeof__(*vs)))              \

    return enif_make_badarg(env);                 \

  count = bin.size / sizeof(__typeof__(*vs));          \

  vs = (__typeof__(vs)) bin.data





ErlNifSInt64 dec_serialize(decimal v);

decimal dec_deserialize(ErlNifSInt64 v);



decimal dec_from_int64(int64_t v);

decimal dec_from_double(double v);

decimal dec_from_binary(int len, char* str);



int64_t dec_to_int64(decimal v);

double dec_to_double(decimal v);



decimal dec_mul(decimal v, int64_t m);

decimal dec_div(decimal v, int64_t m);

decimal dec_add(decimal a, decimal b);

decimal dec_add3(decimal a, decimal b, decimal c);

decimal dec_sub(decimal a, decimal b);



decimal dec_neg(decimal a);



int dec_cmp(decimal a, decimal b);