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Annotation of OpenXM_contrib/gmp/mpq/get_str.c, Revision 1.1.1.1

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: }