/* DEFINITIONS FOR MIRANDA INTEGER PACKAGE (variable length) */

/**************************************************************************
 * Copyright (C) Research Software Limited 1985-90.  All rights reserved. *
 * The Miranda system is distributed as free software under the terms in  *
 * the file "COPYING" which is included in the distribution.              *
 *                                                                        *
 * Revised to C11 standard and made 64bit compatible, January 2020        *
 *------------------------------------------------------------------------*/

#define SIGNBIT 020000000000	/* most significant bit of 32 bit word */
#define IBASE 0100000		/* 2^15 (ie 8^5) so digit is a positive short */
#define MAXDIGIT 077777
#define DIGITWIDTH 15

#define digit0(x) (hd[x]&MAXDIGIT)
#define digit(x) hd[x]
#define rest(x) tl[x]
#define big_is_positive(x) (!(hd[x]&SIGNBIT))
#define big_is_negative(x) (hd[x]&SIGNBIT)
#define bigzero(x) (!digit(x)&&!rest(x))
#define getsmallint(x) (hd[x]&SIGNBIT?-digit0(x):digit(x))
#define stosmallint(x) make(INT,(x)<0?SIGNBIT|(-(x)):(x),0)

/* initialization */
void bigsetup(void);

/* convert between big int and long long */
word big_fromll(long long);
long long big_toll(word);

/* convert between big int and double */
word big_fromd(double);
double big_tod(word);

/* unary negation */
word big_negate(word);

/* compare two big ints */
int big_compare(word, word);

/* basic arithmetic */
word big_add(word, word);
word big_subtract(word, word);
word big_multiply(word, word);
word big_divide(word, word);
word big_remainder(word, word);

/* logarithms and exponentiation */
double big_log(word);
double big_log10(word);
word big_pow(word, word);

/* TODO: combine to make big_tostr(word big, int base) */
word bigtostr(word);
word bigtostr8(word);
word bigtostrx(word);

/* TODO: rename big_fromstr() */
word strtobig(word, int);

/* TODO: combine to make big_scan(char *, ?char*?, int base) */
word bigscan(char *);
word bigoscan(char *, char *);
word bigxscan(char *, char *);

/* TODO: better name and documentation */
int isnat(word);

#define force_dbl(x) ((tag[(x)] == INT) ? big_tod((x)) : get_dbl((x)))

/* END OF DEFINITIONS FOR INTEGER PACKAGE */