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450 lines
11 KiB
C
450 lines
11 KiB
C
/* ported to C by pancake for r2 in 2012-2021 */
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// TODO: integrate floating point support
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// TODO: do not use global variables
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/*
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Reference Chapter 6:
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"The C++ Programming Language", Special Edition.
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Bjarne Stroustrup,Addison-Wesley Pub Co; 3 edition (February 15, 2000)
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ISBN: 0201700735
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*/
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#define R_LOG_ORIGIN "util.calc"
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#include <r_util.h>
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/* accessors */
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static inline RNumCalcValue Nset(ut64 v) { RNumCalcValue n; n.d =(double)v; n.n = v; return n; }
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static inline RNumCalcValue Nsetf(double v) { RNumCalcValue n; n.d = v; n.n =(ut64)v; return n; }
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//UNUSED static inline RNumCalcValue Naddf(RNumCalcValue n, double v) { n.d += v; n.n += (ut64)v; return n; }
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static inline RNumCalcValue Naddi(RNumCalcValue n, ut64 v) { n.d +=(double)v; n.n += v; return n; }
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static inline RNumCalcValue Nsubi(RNumCalcValue n, ut64 v) { n.d -=(double)v; n.n -= v; return n; }
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static inline RNumCalcValue Nneg(RNumCalcValue n) { n.n = ~n.n; return n; }
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static inline RNumCalcValue Nor(RNumCalcValue n, RNumCalcValue v) { n.d = v.d; n.n |= v.n; return n; }
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static inline RNumCalcValue Nxor(RNumCalcValue n, RNumCalcValue v) { n.d = v.d; n.n ^= v.n; return n; }
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static inline RNumCalcValue Nlt(RNumCalcValue n, RNumCalcValue v) { n.d = v.d; n.n = n.n < v.n; return n; }
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static inline RNumCalcValue Ngt(RNumCalcValue n, RNumCalcValue v) { n.d = v.d; n.n = n.n > v.n; return n; }
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static inline RNumCalcValue Nand(RNumCalcValue n, RNumCalcValue v) { n.d = v.d; n.n &= v.n; return n; }
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static inline RNumCalcValue Nadd(RNumCalcValue n, RNumCalcValue v) { n.d += v.d; n.n += v.n; return n; }
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static inline RNumCalcValue Nsub(RNumCalcValue n, RNumCalcValue v) { n.d -= v.d; n.n -= v.n; return n; }
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static inline RNumCalcValue Nmul(RNumCalcValue n, RNumCalcValue v) {
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n.d *= v.d;
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n.n *= v.n;
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return n;
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}
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static inline RNumCalcValue Nshl(RNumCalcValue n, RNumCalcValue v) { n.d += v.d; n.n <<= v.n; return n; }
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static inline RNumCalcValue Nshr(RNumCalcValue n, RNumCalcValue v) { n.d += v.d; n.n >>= v.n; return n; }
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static inline RNumCalcValue Nrol(RNumCalcValue n, RNumCalcValue v) {
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n.d += v.d;
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n.n = (n.n << v.n) | (n.n >> (sizeof (n.n) * 8 - v.n));
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return n;
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}
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static inline RNumCalcValue Nror(RNumCalcValue n, RNumCalcValue v) {
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n.d += v.d;
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n.n = (n.n >> v.n) | (n.n << (sizeof (n.n) * 8 - v.n));
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return n;
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}
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static inline RNumCalcValue Nmod(RNumCalcValue n, RNumCalcValue v) {
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if (v.d) {
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n.d = (n.d - (n.d / v.d));
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} else {
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n.d = 0;
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}
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if (v.n) {
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n.n %= v.n;
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} else {
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n.n = 0;
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}
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return n;
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}
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static inline RNumCalcValue Ndiv(RNumCalcValue n, RNumCalcValue v) {
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if (v.d) {
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n.d /= v.d;
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} else {
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n.d = 0;
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}
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if (v.n) {
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n.n /= v.n;
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} else {
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n.n = 0;
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}
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return n;
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}
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static RNumCalcValue expr(RNum*, RNumCalc*, int);
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static RNumCalcValue term(RNum*, RNumCalc*, int);
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static void error(RNum*, RNumCalc*, const char *);
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static RNumCalcValue prim(RNum*, RNumCalc*, int);
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static RNumCalcToken get_token(RNum*, RNumCalc*);
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static void error(RNum *num, RNumCalc *nc, const char *s) {
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nc->errors++;
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nc->calc_err = s;
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//fprintf (stderr, "error: %s\n", s);
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}
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static RNumCalcValue expr(RNum *num, RNumCalc *nc, int get) {
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RNumCalcValue left = term (num, nc, get);
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for (;;) {
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switch (nc->curr_tok) {
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case RNCSHL: left = Nshl (left, term (num, nc, 1)); break;
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case RNCSHR: left = Nshr (left, term (num, nc, 1)); break;
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case RNCROL: left = Nrol (left, term (num, nc, 1)); break;
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case RNCROR: left = Nror (left, term (num, nc, 1)); break;
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case RNCPLUS: left = Nadd (left, term (num, nc, 1)); break;
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case RNCMINUS: left = Nsub (left, term (num, nc, 1)); break;
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case RNCXOR: left = Nxor (left, term (num, nc, 1)); break;
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case RNCOR: left = Nor (left, term (num, nc, 1)); break;
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case RNCAND: left = Nand (left, term (num, nc, 1)); break;
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case RNCLT: left = Nlt (left, term (num, nc, 1)); break;
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case RNCGT: left = Ngt (left, term (num, nc, 1)); break;
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default:
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return left;
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}
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}
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return left;
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}
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static RNumCalcValue term(RNum *num, RNumCalc *nc, int get) {
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RNumCalcValue left = prim (num, nc, get);
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for (;;) {
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if (nc->curr_tok == RNCMUL) {
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left = Nmul (left, prim (num, nc, 1));
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} else if (nc->curr_tok == RNCMOD) {
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RNumCalcValue d = prim (num, nc, 1);
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if (!d.d) {
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//error (num, nc, "divide by 0");
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return d;
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}
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left = Nmod (left, d);
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} else if (nc->curr_tok == RNCDIV) {
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RNumCalcValue d = prim (num, nc, 1);
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if (num && (!d.d || !d.n)) {
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num->dbz = 1;
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return d;
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}
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left = Ndiv (left, d);
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} else {
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return left;
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}
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}
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}
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static RNumCalcValue prim(RNum *num, RNumCalc *nc, int get) {
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RNumCalcValue v = {0};
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if (get) {
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get_token (num, nc);
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}
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switch (nc->curr_tok) {
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case RNCNUMBER:
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v = nc->number_value;
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get_token (num, nc);
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return v;
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case RNCNAME:
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//fprintf (stderr, "error: unknown keyword (%s)\n", nc->string_value);
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//double& v = table[nc->string_value];
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r_str_trim (nc->string_value);
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v = Nset (r_num_get (num, nc->string_value));
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get_token (num, nc);
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if (nc->curr_tok == RNCASSIGN) {
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v = expr (num, nc, 1);
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}
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if (nc->curr_tok == RNCINC) {
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Naddi (v, 1);
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}
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if (nc->curr_tok == RNCDEC) {
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Nsubi (v, 1);
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}
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return v;
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case RNCNEG:
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get_token (num, nc);
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return Nneg (nc->number_value); //prim (num, nc, 1), 1);
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case RNCINC:
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return Naddi (prim (num, nc, 1), 1);
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case RNCDEC:
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return Naddi (prim (num, nc, 1), -1);
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case RNCOR:
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return Nor (v, prim (num, nc, 1));
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case RNCMINUS:
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return Nsub (v, prim (num, nc, 1));
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case RNCLEFTP:
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v = expr (num, nc, 1);
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if (nc->curr_tok == RNCRIGHTP) {
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get_token (num, nc);
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} else {
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error (num, nc, " ')' expected");
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}
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case RNCLT:
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case RNCGT:
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case RNCEND:
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case RNCXOR:
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case RNCAND:
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case RNCPLUS:
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case RNCMOD:
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case RNCMUL:
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case RNCDIV:
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case RNCPRINT:
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case RNCASSIGN:
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case RNCRIGHTP:
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case RNCSHL:
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case RNCSHR:
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case RNCROL:
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case RNCROR:
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return v;
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//default: error (num, nc, "primary expected");
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}
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return v;
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}
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static void cin_putback(RNum *num, RNumCalc *nc, char c) {
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nc->oc = c;
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}
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R_API const char *r_num_calc_index(RNum *num, const char *p) {
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if (!num) {
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return NULL;
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}
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if (p) {
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num->nc.calc_buf = p;
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num->nc.calc_len = strlen (p);
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num->nc.calc_i = 0;
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}
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return num->nc.calc_buf + num->nc.calc_i;
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}
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static int cin_get(RNum *num, RNumCalc *nc, char *c) {
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if (nc->oc) {
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*c = nc->oc;
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nc->oc = 0;
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} else {
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if (!nc->calc_buf || !*nc->calc_buf) {
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return 0;
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}
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*c = nc->calc_buf[nc->calc_i];
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if (*c) {
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nc->calc_i++;
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} else {
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return 0;
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}
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}
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return 1;
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}
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static int cin_get_num(RNum *num, RNumCalc *nc, RNumCalcValue *n) {
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double d;
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char str[R_NUMCALC_STRSZ + 1]; // TODO: move into the heap?
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int i = 0;
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char c;
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str[0] = 0;
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while (cin_get (num, nc, &c)) {
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if (c != '_' && c != ':' && c != '.' && !isalnum ((ut8)c)) {
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cin_putback (num, nc, c);
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break;
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}
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if (i < R_NUMCALC_STRSZ) {
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str[i++] = c;
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}
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}
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str[i] = 0;
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*n = Nset (r_num_get (num, str));
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if (IS_DIGIT (*str) && strchr (str, '.')) {
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if (sscanf (str, "%lf", &d) < 1) {
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return 0;
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}
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if (n->n < d) {
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*n = Nsetf (d);
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}
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n->d = d;
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}
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return 1;
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}
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static RNumCalcToken get_token(RNum *num, RNumCalc *nc) {
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char ch = 0, c = 0;
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do {
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if (!cin_get (num, nc, &ch)) {
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return nc->curr_tok = RNCEND;
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}
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} while (ch != '\n' && isspace ((ut8)ch));
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switch (ch) {
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case 0:
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case ';':
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case '\n':
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return nc->curr_tok = RNCEND;
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case '+': // added for ++name and name++
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if (cin_get (num, nc, &c) && c == '+') {
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return nc->curr_tok = RNCINC;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = (RNumCalcToken) ch;
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// negate hack
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case '~':
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if (cin_get (num, nc, &c) && c == '-') {
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return nc->curr_tok = RNCNEG;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = (RNumCalcToken) ch;
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// negative number
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case '-':
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if (cin_get (num, nc, &c) && c == '-') {
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return nc->curr_tok = RNCDEC;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = (RNumCalcToken) ch;
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case '<':
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if (cin_get (num, nc, &c) && c == '<') { // "<<" = shift left
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if (cin_get (num, nc, &c) && c == '<') { // "<<<" = rotate left
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return nc->curr_tok = RNCROL;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = RNCSHL;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = RNCLT; // RNCEND;
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case '>':
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if (cin_get (num, nc, &c) && c == '>') {
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if (cin_get (num, nc, &c) && c == '>') {
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return nc->curr_tok = RNCROR;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = RNCSHR;
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}
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cin_putback (num, nc, c);
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return nc->curr_tok = RNCGT; // RNCEND
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case '^':
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case '&':
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case '|':
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case '*':
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case '%':
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case '/':
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case '(':
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case ')':
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case '=':
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return nc->curr_tok = (RNumCalcToken) ch;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case '.':
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cin_putback (num, nc, ch);
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if (!cin_get_num (num, nc, &nc->number_value)) {
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error (num, nc, "invalid number conversion");
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return 1;
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}
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return nc->curr_tok = RNCNUMBER;
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#define isvalidchar(x) \
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(isalnum(x) || (x)==':' || (x)=='$' || (x)=='.' || (x)=='_' || (x)=='?' || (x)=='\\' \
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|| (x)==' ' || (x)=='[' || (x)==']' || (x)=='}' || (x)=='{' || ((x)>='0' && (x)<='9'))
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default:
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{
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int i = 0;
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#define stringValueAppend(x) { \
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const size_t max = sizeof (nc->string_value) - 1; \
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if (i < max) { nc->string_value[i++] = x; } \
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else { nc->string_value[max] = 0; } \
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}
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stringValueAppend (ch);
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if (ch == '[') {
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while (cin_get (num, nc, &ch) && ch != ']') {
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if (i > R_NUMCALC_STRSZ - 1) {
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error (num, nc, "string too long");
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return 0;
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}
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stringValueAppend (ch);
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}
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if (ch != ']') {
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error (num, nc, "cannot find closing ]");
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return 0;
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}
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stringValueAppend (ch);
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} else if (ch == ']') {
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error (num, nc, "cannot find opening [");
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return 0;
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} else {
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while (cin_get (num, nc, &ch) && isvalidchar ((unsigned char)ch)) {
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if (i >= R_NUMCALC_STRSZ) {
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error (num, nc, "string too long");
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return 0;
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}
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stringValueAppend (ch);
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}
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}
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stringValueAppend (0);
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if (ch != '\'') {
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cin_putback (num, nc, ch);
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}
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return nc->curr_tok = RNCNAME;
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}
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}
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}
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static void load_token(RNum *num, RNumCalc *nc, const char *s) {
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nc->calc_i = 0;
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nc->calc_len = strlen (s);
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nc->calc_buf = s;
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nc->calc_err = NULL;
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}
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R_API ut64 r_num_calc(RNum *num, const char *str, const char **err) {
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RNumCalcValue n;
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RNumCalc *nc, nc_local;
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if (R_STR_ISEMPTY (str)) {
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return 0LL;
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}
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if (num) {
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nc = &num->nc;
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num->dbz = 0;
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} else {
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nc = &nc_local;
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}
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/* init */
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nc->curr_tok = RNCPRINT;
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nc->number_value.d = 0.0;
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nc->number_value.n = 0LL;
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nc->errors = 0;
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nc->oc = 0;
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nc->calc_err = NULL;
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nc->calc_i = 0;
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nc->calc_len = 0;
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nc->calc_buf = NULL;
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nc->under_calc = true;
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load_token (num, nc, str);
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get_token (num, nc);
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n = expr (num, nc, 0);
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if (err) {
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*err = nc->calc_err;
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}
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if (num) {
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num->fvalue = n.d;
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num->value = n.n;
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}
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nc->under_calc = false;
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return n.n;
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}
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#ifdef TEST
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int main(int argc, char* argv[]) {
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RNumCalcValue n;
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RNumCalc nc;
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while (!feof (stdin)) {
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get_token (nc);
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if (nc.curr_tok == RNCEND) {
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break;
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}
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if (nc.curr_tok == RNCPRINT) {
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continue;
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}
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n = expr (num, nc, 0);
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if (n.d == ((double)(int)n.d)) {
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printf ("%llx\n", n.n);
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} else {
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printf ("%lf\n", n.d);
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}
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}
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return nc->errors;
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}
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#endif
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