| 1 | /* Test mpz_sizeinbase. |
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| 2 | |
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| 3 | Copyright 2001, 2002 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This file is part of the GNU MP Library. |
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| 6 | |
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| 7 | The GNU MP Library is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU Lesser General Public License as published by |
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| 9 | the Free Software Foundation; either version 2.1 of the License, or (at your |
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| 10 | option) any later version. |
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| 11 | |
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| 12 | The GNU MP Library is distributed in the hope that it will be useful, but |
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| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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| 15 | License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU Lesser General Public License |
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| 18 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
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| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
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| 20 | MA 02111-1307, USA. */ |
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| 21 | |
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| 22 | #include <stdio.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include "gmp.h" |
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| 25 | #include "gmp-impl.h" |
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| 26 | #include "tests.h" |
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| 27 | |
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| 28 | |
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| 29 | /* Create a fake mpz consisting of just a single 1 bit, with totbits being |
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| 30 | the total number of bits, inclusive of that 1 bit. */ |
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| 31 | void |
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| 32 | mpz_fake_bits (mpz_ptr z, unsigned long totbits) |
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| 33 | { |
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| 34 | static mp_limb_t n; |
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| 35 | unsigned long zero_bits, zero_limbs; |
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| 36 | |
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| 37 | zero_bits = totbits - 1; |
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| 38 | zero_limbs = zero_bits / GMP_NUMB_BITS; |
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| 39 | zero_bits %= GMP_NUMB_BITS; |
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| 40 | |
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| 41 | SIZ(z) = zero_limbs + 1; |
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| 42 | PTR(z) = (&n) - (SIZ(z) - 1); |
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| 43 | n = CNST_LIMB(1) << zero_bits; |
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| 44 | |
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| 45 | ASSERT_ALWAYS (mpz_sizeinbase (z, 2) == totbits); |
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| 46 | } |
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| 47 | |
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| 48 | |
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| 49 | /* This was seen to fail on a GNU/Linux powerpc32 with gcc 2.95.2, |
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| 50 | apparently due to a doubtful value of mp_bases[10].chars_per_bit_exactly |
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| 51 | (0X1.34413509F79FDP-2 whereas 0X1.34413509F79FFP-2 is believed correct). |
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| 52 | Presumably this is a glibc problem when gcc converts the decimal string |
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| 53 | in mp_bases.c, or maybe it's only a function of the rounding mode during |
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| 54 | compilation. */ |
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| 55 | void |
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| 56 | check_sample (void) |
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| 57 | { |
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| 58 | unsigned long totbits = 198096465; |
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| 59 | int base = 10; |
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| 60 | size_t want = 59632979; |
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| 61 | size_t got; |
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| 62 | mpz_t z; |
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| 63 | |
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| 64 | mpz_fake_bits (z, totbits); |
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| 65 | got = mpz_sizeinbase (z, base); |
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| 66 | if (got != want) |
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| 67 | { |
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| 68 | printf ("mpz_sizeinbase\n"); |
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| 69 | printf (" base %d\n", base); |
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| 70 | printf (" totbits %lu\n", totbits); |
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| 71 | printf (" got %u\n", got); |
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| 72 | printf (" want %u\n", want); |
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| 73 | abort (); |
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| 74 | } |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | int |
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| 79 | main (void) |
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| 80 | { |
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| 81 | tests_start (); |
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| 82 | |
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| 83 | /* Disabled due to the bogosity of trying to fake an _mp_d pointer to |
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| 84 | below an object. Has been seen to fail on a hppa system. */ |
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| 85 | |
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| 86 | /* check_sample (); */ |
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| 87 | |
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| 88 | tests_end (); |
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| 89 | exit (0); |
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| 90 | } |
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