1 /* Tests of mpz_scan0 and mpz_scan1.
2
3 Copyright 2000-2003 Free Software Foundation, Inc.
4
5 This file is part of the GNU MP Library test suite.
6
7 The GNU MP Library test suite is free software; you can redistribute it
8 and/or modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 3 of the License,
10 or (at your option) any later version.
11
12 The GNU MP Library test suite is distributed in the hope that it will be
13 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 Public License for more details.
16
17 You should have received a copy of the GNU General Public License along with
18 the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include "gmp-impl.h"
23 #include "tests.h"
24
25
26 unsigned long
refmpz_scan(mpz_srcptr z,unsigned long i,int sought)27 refmpz_scan (mpz_srcptr z, unsigned long i, int sought)
28 {
29 unsigned long z_bits = (unsigned long) ABSIZ(z) * GMP_NUMB_BITS;
30
31 do
32 {
33 if (mpz_tstbit (z, i) == sought)
34 return i;
35 i++;
36 }
37 while (i <= z_bits);
38
39 return ULONG_MAX;
40 }
41
42 unsigned long
refmpz_scan0(mpz_srcptr z,unsigned long starting_bit)43 refmpz_scan0 (mpz_srcptr z, unsigned long starting_bit)
44 {
45 return refmpz_scan (z, starting_bit, 0);
46 }
47
48 unsigned long
refmpz_scan1(mpz_srcptr z,unsigned long starting_bit)49 refmpz_scan1 (mpz_srcptr z, unsigned long starting_bit)
50 {
51 return refmpz_scan (z, starting_bit, 1);
52 }
53
54
55 void
check_ref(void)56 check_ref (void)
57 {
58 static const int offset[] = {
59 -2, -1, 0, 1, 2, 3
60 };
61
62 mpz_t z;
63 int test, neg, sought, oindex, o;
64 mp_size_t size, isize;
65 unsigned long start, got, want;
66
67 mpz_init (z);
68 for (test = 0; test < 5; test++)
69 {
70 for (size = 0; size < 5; size++)
71 {
72 mpz_random2 (z, size);
73
74 for (neg = 0; neg <= 1; neg++)
75 {
76 if (neg)
77 mpz_neg (z, z);
78
79 for (isize = 0; isize <= size; isize++)
80 {
81 for (oindex = 0; oindex < numberof (offset); oindex++)
82 {
83 o = offset[oindex];
84 if ((int) isize*GMP_NUMB_BITS < -o)
85 continue; /* start would be negative */
86
87 start = isize*GMP_NUMB_BITS + o;
88
89 for (sought = 0; sought <= 1; sought++)
90 {
91 if (sought == 0)
92 {
93 got = mpz_scan0 (z, start);
94 want = refmpz_scan0 (z, start);
95 }
96 else
97 {
98 got = mpz_scan1 (z, start);
99 want = refmpz_scan1 (z, start);
100 }
101
102 if (got != want)
103 {
104 printf ("wrong at test=%d, size=%ld, neg=%d, start=%lu, sought=%d\n",
105 test, size, neg, start, sought);
106 printf (" z 0x");
107 mpz_out_str (stdout, -16, z);
108 printf ("\n");
109 printf (" got=%lu, want=%lu\n", got, want);
110 exit (1);
111 }
112 }
113 }
114 }
115 }
116 }
117 }
118 mpz_clear (z);
119 }
120
121
122 int
main(int argc,char * argv[])123 main (int argc, char *argv[])
124 {
125 tests_start ();
126
127 check_ref ();
128
129 tests_end ();
130 exit (0);
131 }
132