68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
|
/* mpq_get_str -- mpq to string conversion.
|
||
|
|
|
||
|
|
Copyright 2001, 2002 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 2.1 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; see the file COPYING.LIB. If not, write to
|
||
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
||
|
|
MA 02110-1301, USA. */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include "gmp.h"
|
||
|
|
#include "gmp-impl.h"
|
||
|
|
|
||
|
|
char *
|
||
|
|
mpq_get_str (char *str, int base, mpq_srcptr q)
|
||
|
|
{
|
||
|
|
size_t str_alloc, len;
|
||
|
|
|
||
|
|
ASSERT (ABS(base) >= 2);
|
||
|
|
ASSERT (ABS(base) <= 36);
|
||
|
|
|
||
|
|
str_alloc = 0;
|
||
|
|
if (str == NULL)
|
||
|
|
{
|
||
|
|
/* This is an overestimate since we don't bother checking how much of
|
||
|
|
the high limbs of num and den are used. +2 for rounding up the
|
||
|
|
chars per bit of num and den. +3 for sign, slash and '\0'. */
|
||
|
|
str_alloc = ((size_t) ((ABS (q->_mp_num._mp_size) + q->_mp_den._mp_size)
|
||
|
|
* BITS_PER_MP_LIMB
|
||
|
|
* __mp_bases[ABS(base)].chars_per_bit_exactly))
|
||
|
|
+ 5;
|
||
|
|
str = (char *) (*__gmp_allocate_func) (str_alloc);
|
||
|
|
}
|
||
|
|
|
||
|
|
mpz_get_str (str, base, mpq_numref(q));
|
||
|
|
len = strlen (str);
|
||
|
|
if (! MPZ_EQUAL_1_P (mpq_denref (q)))
|
||
|
|
{
|
||
|
|
str[len++] = '/';
|
||
|
|
mpz_get_str (str+len, base, mpq_denref(q));
|
||
|
|
len += strlen (str+len);
|
||
|
|
}
|
||
|
|
|
||
|
|
ASSERT (len == strlen(str));
|
||
|
|
ASSERT (str_alloc == 0 || len+1 <= str_alloc);
|
||
|
|
ASSERT (len+1 <= /* size recommended to applications */
|
||
|
|
mpz_sizeinbase (mpq_numref(q), ABS(base)) +
|
||
|
|
mpz_sizeinbase (mpq_denref(q), ABS(base)) + 3);
|
||
|
|
|
||
|
|
if (str_alloc != 0)
|
||
|
|
__GMP_REALLOCATE_FUNC_MAYBE_TYPE (str, str_alloc, len+1, char);
|
||
|
|
|
||
|
|
return str;
|
||
|
|
}
|