100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/* mpz expression evaluation
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Copyright 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "gmp.h"
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#include "expr-impl.h"
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/* No need to parse '-' since that's handled as an operator.
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This function also by mpq_expr_a, so it's not static. */
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size_t
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mpexpr_mpz_number (mpz_ptr res, __gmp_const char *e, size_t elen, int base)
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{
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char *edup;
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size_t i, ret;
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int base_effective = (base == 0 ? 10 : base);
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void *(*allocate_func) (size_t);
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void (*free_func) (void *, size_t);
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i = 0;
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if (e[i] == '0')
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{
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i++;
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if (e[i] == 'x' || e[i] == 'b')
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i++;
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}
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for ( ; i < elen; i++)
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if (! isasciidigit_in_base (e[i], base_effective))
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break;
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mp_get_memory_functions (&allocate_func, NULL, &free_func);
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edup = (*allocate_func) (i+1);
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memcpy (edup, e, i);
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edup[i] = '\0';
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if (mpz_set_str (res, edup, base) == 0)
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ret = i;
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else
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ret = 0;
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(*free_func) (edup, i+1);
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return ret;
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}
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/* ignoring prec */
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static void
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e_mpz_init (mpz_ptr z, unsigned long prec)
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{
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mpz_init (z);
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}
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int
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mpz_expr_a (__gmp_const struct mpexpr_operator_t *table,
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mpz_ptr res, int base,
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__gmp_const char *e, size_t elen,
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mpz_srcptr var[26])
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{
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struct mpexpr_parse_t p;
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p.table = table;
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p.res = (mpX_ptr) res;
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p.base = base;
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p.e = e;
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p.elen = elen;
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p.var = (mpX_srcptr *) var;
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p.mpX_clear = (mpexpr_fun_one_t) mpz_clear;
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p.mpX_ulong_p = (mpexpr_fun_i_unary_t) mpz_fits_ulong_p;
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p.mpX_get_ui = (mpexpr_fun_get_ui_t) mpz_get_ui;
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p.mpX_init = (mpexpr_fun_unary_ui_t) e_mpz_init;
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p.mpX_number = (mpexpr_fun_number_t) mpexpr_mpz_number;
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p.mpX_set = (mpexpr_fun_unary_t) mpz_set;
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p.mpX_set_or_swap = (mpexpr_fun_unary_t) mpz_swap;
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p.mpX_set_si = (mpexpr_fun_set_si_t) mpz_set_si;
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p.mpX_swap = (mpexpr_fun_swap_t) mpz_swap;
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return mpexpr_evaluate (&p);
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}
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