diff options
Diffstat (limited to 'bignum.h')
| -rw-r--r-- | bignum.h | 36 |
1 files changed, 22 insertions, 14 deletions
@@ -24,6 +24,7 @@ #define bignum(x) char x[6] #define bignump char * +/****** constants ******/ /* zero */ #define BIG_0 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } @@ -41,17 +42,36 @@ /* max value for a ulong */ #define BIG_MAX_ULONG { 0x44, 0x42, 0x94, 0x96, 0x72, 0x95 } +/****** functions ******/ + +/* copy dest to src. could be a wrapper for memcpy() */ extern void __fastcall__ big_copy(bignump dest, bignump src); +/* these 2 would be easy to implement, but aren't really needed */ // void int_to_big(int i, bignum *b); // void uint_to_big(unsigned int i, bignum *b); +/* convert an unsigned long to a bignum */ extern void __fastcall__ ulong_to_big(const unsigned long l, bignump b); -/* returns 0 for success, nonzero for fail (overflow or negative) */ +/* convert a bignum to an unsigned long + returns 0 for success, nonzero for fail (overflow or negative) */ extern char __fastcall__ big_to_ulong(bignump b, unsigned long *l); -// extern unsigned long __fastcall__ cformat_big(char *magnitude, const bignum *b); +/* compare two bignums. like Perl's spaceship operator, <=> + returns | if + ---------+---------------- + 0 | a == b + positive| a > b + negative| a < b + +BEWARE: unlike perl's <=>, the return value is *not* guaranteed to + be 0, 1, or -1. This is more like C's strcmp() or memcmp(). + Do not depend on any particular positive or negative return + value from this: + if(big_cmp(a, b) == -1) // WRONG! + if(big_cmp(a, b) < 0) // Right. */ +extern signed char __fastcall__ big_cmp(bignump a, bignump b); /* basic math functions. conceptually they return a boolean for success, but only division has error checking. @@ -74,19 +94,7 @@ extern char __cdecl__ big_div(bignump dest, bignump dividend, bignump divisor); */ extern char __fastcall__ bank_maxed_out(bignump b); -/* comparison. Perl spaceship operator, <=> - returns | if - ---------+---------------- - 0 | a == b - positive| a > b - negative| a < b - -BEWARE: unlike perl's <=>, the return value is *not* guaranteed to - be 0, 1, or -1. This is more like C's strcmp() or memcmp(). - */ // signed char big_cmp(const bignum *a, const bignum *b) -extern signed char __fastcall__ big_cmp(bignump a, bignump b); - extern unsigned long cformat_big(char *magnitude, bignump b); extern void cprintfancy_big(bignump b); |