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/* mpf expression evaluation
Copyright 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
/* Future: Bitwise "&", "|" and "&" could be done, if desired. Not sure
those functions would be much value though. */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "gmp.h"
#include "expr-impl.h"
/* Change this to "#define TRACE(x) x" to get some traces. */
#define TRACE(x)
static size_t
e_mpf_number (mpf_ptr res, __gmp_const char *e, size_t elen, int base)
{
char *edup;
size_t i, ret, extra=0;
int mant_base, exp_base;
void *(*allocate_func) (size_t);
void (*free_func) (void *, size_t);
TRACE (printf ("mpf_number base=%d \"%.*s\"\n", base, (int) elen, e));
/* mpf_set_str doesn't currently accept 0x for hex in base==0, so do it
here instead. FIXME: Would prefer to let mpf_set_str handle this. */
if (base == 0 && elen >= 2 && e[0] == '0' && (e[1] == 'x' || e[1] == 'X'))
{
base = 16;
extra = 2;
e += extra;
elen -= extra;
}
if (base == 0)
mant_base = 10;
else if (base < 0)
mant_base = -base;
else
mant_base = base;
/* exponent in decimal if base is negative */
if (base < 0)
exp_base = 10;
else if (base == 0)
exp_base = 10;
else
exp_base = base;
#define IS_EXPONENT(c) \
(c == '@' || (base <= 10 && base >= -10 && (e[i] == 'e' || e[i] == 'E')))
i = 0;
for (;;)
{
if (i >= elen)
goto parsed;
if (e[i] == '.')
break;
if (IS_EXPONENT (e[i]))
goto exponent;
if (! isasciidigit_in_base (e[i], mant_base))
goto parsed;
i++;
}
/* fraction */
i++;
for (;;)
{
if (i >= elen)
goto parsed;
if (IS_EXPONENT (e[i]))
goto exponent;
if (! isasciidigit_in_base (e[i], mant_base))
goto parsed;
i++;
}
exponent:
i++;
if (i >= elen)
goto parsed;
if (e[i] == '-')
i++;
for (;;)
{
if (i >= elen)
goto parsed;
if (! isasciidigit_in_base (e[i], exp_base))
break;
i++;
}
parsed:
TRACE (printf (" parsed i=%u \"%.*s\"\n", i, (int) i, e));
mp_get_memory_functions (&allocate_func, NULL, &free_func);
edup = (*allocate_func) (i+1);
memcpy (edup, e, i);
edup[i] = '\0';
if (mpf_set_str (res, edup, base) == 0)
ret = i + extra;
else
ret = 0;
(*free_func) (edup, i+1);
return ret;
}
static int
e_mpf_ulong_p (mpf_srcptr f)
{
return mpf_integer_p (f) && mpf_fits_ulong_p (f);
}
/* Don't want to change the precision of w, can only do an actual swap when
w and x have the same precision. */
static void
e_mpf_set_or_swap (mpf_ptr w, mpf_ptr x)
{
if (mpf_get_prec (w) == mpf_get_prec (x))
mpf_swap (w, x);
else
mpf_set (w, x);
}
int
mpf_expr_a (__gmp_const struct mpexpr_operator_t *table,
mpf_ptr res, int base, unsigned long prec,
__gmp_const char *e, size_t elen,
mpf_srcptr var[26])
{
struct mpexpr_parse_t p;
p.table = table;
p.res = (mpX_ptr) res;
p.base = base;
p.prec = prec;
p.e = e;
p.elen = elen;
p.var = (mpX_srcptr *) var;
p.mpX_clear = (mpexpr_fun_one_t) mpf_clear;
p.mpX_ulong_p = (mpexpr_fun_i_unary_t) e_mpf_ulong_p;
p.mpX_get_ui = (mpexpr_fun_get_ui_t) mpf_get_ui;
p.mpX_init = (mpexpr_fun_unary_ui_t) mpf_init2;
p.mpX_number = (mpexpr_fun_number_t) e_mpf_number;
p.mpX_set = (mpexpr_fun_unary_t) mpf_set;
p.mpX_set_or_swap = (mpexpr_fun_unary_t) e_mpf_set_or_swap;
p.mpX_set_si = (mpexpr_fun_set_si_t) mpf_set_si;
p.mpX_swap = (mpexpr_fun_swap_t) mpf_swap;
return mpexpr_evaluate (&p);
}
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