1 /* mpq_get_str -- mpq to string conversion.
3 Copyright 2001, 2002, 2006 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
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 3 of the License, or (at your
10 option) any later version.
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.
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
26 mpq_get_str (char *str, int base, mpq_srcptr q)
28 size_t str_alloc, len;
30 ASSERT (ABS(base) >= 2);
31 ASSERT (ABS(base) <= 62);
36 /* This is an overestimate since we don't bother checking how much of
37 the high limbs of num and den are used. +2 for rounding up the
38 chars per bit of num and den. +3 for sign, slash and '\0'. */
39 str_alloc = ((size_t) ((ABS (q->_mp_num._mp_size) + q->_mp_den._mp_size)
41 * mp_bases[ABS(base)].chars_per_bit_exactly))
43 str = (char *) (*__gmp_allocate_func) (str_alloc);
46 mpz_get_str (str, base, mpq_numref(q));
48 if (! MPZ_EQUAL_1_P (mpq_denref (q)))
51 mpz_get_str (str+len, base, mpq_denref(q));
52 len += strlen (str+len);
55 ASSERT (len == strlen(str));
56 ASSERT (str_alloc == 0 || len+1 <= str_alloc);
57 ASSERT (len+1 <= /* size recommended to applications */
58 mpz_sizeinbase (mpq_numref(q), ABS(base)) +
59 mpz_sizeinbase (mpq_denref(q), ABS(base)) + 3);
62 __GMP_REALLOCATE_FUNC_MAYBE_TYPE (str, str_alloc, len+1, char);