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Annotation of OpenXM_contrib/gmp/mpq/get_str.c, Revision 1.1

1.1     ! ohara       1: /* mpq_get_str -- mpq to string conversion.
        !             2:
        !             3: Copyright 2001, 2002 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <stdio.h>
        !            23: #include <string.h>
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26:
        !            27: char *
        !            28: mpq_get_str (char *str, int base, mpq_srcptr q)
        !            29: {
        !            30:   size_t  str_alloc, len;
        !            31:
        !            32:   ASSERT (ABS(base) >= 2);
        !            33:   ASSERT (ABS(base) <= 36);
        !            34:
        !            35:   str_alloc = 0;
        !            36:   if (str == NULL)
        !            37:     {
        !            38:       /* This is an overestimate since we don't bother checking how much of
        !            39:          the high limbs of num and den are used.  +2 for rounding up the
        !            40:          chars per bit of num and den.  +3 for sign, slash and '\0'.  */
        !            41:       str_alloc = ((size_t) ((ABS (q->_mp_num._mp_size) + q->_mp_den._mp_size)
        !            42:                              * BITS_PER_MP_LIMB
        !            43:                              * __mp_bases[ABS(base)].chars_per_bit_exactly))
        !            44:                    + 5;
        !            45:       str = (char *) (*__gmp_allocate_func) (str_alloc);
        !            46:     }
        !            47:
        !            48:   mpz_get_str (str, base, mpq_numref(q));
        !            49:   len = strlen (str);
        !            50:   if (! MPZ_EQUAL_1_P (mpq_denref (q)))
        !            51:     {
        !            52:       str[len++] = '/';
        !            53:       mpz_get_str (str+len, base, mpq_denref(q));
        !            54:       len += strlen (str+len);
        !            55:     }
        !            56:
        !            57:   ASSERT (len == strlen(str));
        !            58:   ASSERT (str_alloc == 0 || len+1 <= str_alloc);
        !            59:   ASSERT (len+1 <=  /* size recommended to applications */
        !            60:           mpz_sizeinbase (mpq_numref(q), ABS(base)) +
        !            61:           mpz_sizeinbase (mpq_denref(q), ABS(base)) + 3);
        !            62:
        !            63:   if (str_alloc != 0)
        !            64:     __GMP_REALLOCATE_FUNC_MAYBE_TYPE (str, str_alloc, len+1, char);
        !            65:
        !            66:   return str;
        !            67: }