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Annotation of OpenXM_contrib/gmp/demos/expr/exprqa.c, Revision 1.1

1.1     ! ohara       1: /* mpq expression evaluation */
        !             2:
        !             3: /*
        !             4: Copyright 2000, 2001 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Lesser General Public License as published by
        !            10: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Lesser General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA.
        !            22: */
        !            23:
        !            24:
        !            25: #include <stdio.h>
        !            26: #include "gmp.h"
        !            27: #include "expr-impl.h"
        !            28:
        !            29:
        !            30: static int
        !            31: e_mpq_ulong_p (mpq_srcptr q)
        !            32: {
        !            33:   return mpz_fits_ulong_p (mpq_numref (q))
        !            34:     && mpz_cmp_ui (mpq_denref (q), 1L) == 0;
        !            35: }
        !            36:
        !            37: /* get value as a ui, on the assumption it fits */
        !            38: static int
        !            39: e_mpq_get_ui_fits (mpq_srcptr q)
        !            40: {
        !            41:   return mpz_get_ui (mpq_numref (q));
        !            42: }
        !            43:
        !            44: static void
        !            45: e_mpq_set_si1 (mpq_ptr q, long num)
        !            46: {
        !            47:   mpq_set_si (q, num, 1L);
        !            48: }
        !            49:
        !            50: /* The same as mpz, but putting the result in the numerator.  Negatives and
        !            51:    fractions aren't parsed here because '-' and '/' are operators. */
        !            52: static size_t
        !            53: e_mpq_number (mpq_ptr res, __gmp_const char *e, size_t elen, int base)
        !            54: {
        !            55:   mpz_set_ui (mpq_denref (res), 1L);
        !            56:   return mpexpr_mpz_number (mpq_numref (res), e, elen, base);
        !            57: }
        !            58:
        !            59:
        !            60: int
        !            61: mpq_expr_a (__gmp_const struct mpexpr_operator_t *table,
        !            62:             mpq_ptr res, int base,
        !            63:             __gmp_const char *e, size_t elen,
        !            64:             mpq_srcptr var[26])
        !            65: {
        !            66:   struct mpexpr_parse_t  p;
        !            67:
        !            68:   p.table = table;
        !            69:   p.res = (mpX_ptr) res;
        !            70:   p.base = base;
        !            71:   p.e = e;
        !            72:   p.elen = elen;
        !            73:   p.var = (mpX_srcptr *) var;
        !            74:
        !            75:   p.mpX_clear       = (mpexpr_fun_one_t)      mpq_clear;
        !            76:   p.mpX_ulong_p     = (mpexpr_fun_i_unary_t)  e_mpq_ulong_p;
        !            77:   p.mpX_get_ui      = (mpexpr_fun_get_ui_t)   e_mpq_get_ui_fits;
        !            78:   p.mpX_init        = (mpexpr_fun_unary_ui_t) mpq_init;
        !            79:   p.mpX_number      = (mpexpr_fun_number_t)   e_mpq_number;
        !            80:   p.mpX_set         = (mpexpr_fun_unary_t)    mpq_set;
        !            81:   p.mpX_set_or_swap = (mpexpr_fun_unary_t)    mpq_swap;
        !            82:   p.mpX_set_si      = (mpexpr_fun_set_si_t)   e_mpq_set_si1;
        !            83:   p.mpX_swap        = (mpexpr_fun_swap_t)     mpq_swap;
        !            84:
        !            85:   return mpexpr_evaluate (&p);
        !            86: }