BadVPN – Blame information for rev 1
?pathlinks?
Rev | Author | Line No. | Line |
---|---|---|---|
1 | office | 1 | /** |
2 | * @file modadd.h |
||
3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
||
4 | * |
||
5 | * @section LICENSE |
||
6 | * |
||
7 | * Redistribution and use in source and binary forms, with or without |
||
8 | * modification, are permitted provided that the following conditions are met: |
||
9 | * 1. Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * 2. Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
13 | * documentation and/or other materials provided with the distribution. |
||
14 | * 3. Neither the name of the author nor the |
||
15 | * names of its contributors may be used to endorse or promote products |
||
16 | * derived from this software without specific prior written permission. |
||
17 | * |
||
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
||
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
||
20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
||
21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
||
22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
||
23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||
24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
||
25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
||
27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
28 | * |
||
29 | * @section DESCRIPTION |
||
30 | * |
||
31 | * Modular addition macro. |
||
32 | * |
||
33 | * Calculates (x + y) mod m, assuming |
||
34 | * 0 <= x < m and 0 <= y < m. |
||
35 | */ |
||
36 | |||
37 | #ifndef BADVPN_MISC_MODADD_H |
||
38 | #define BADVPN_MISC_MODADD_H |
||
39 | |||
40 | #include <misc/debug.h> |
||
41 | |||
42 | #define DECLARE_BMODADD(type, name) \ |
||
43 | static type bmodadd_##name (type x, type y, type m) \ |
||
44 | { \ |
||
45 | ASSERT(x >= 0) \ |
||
46 | ASSERT(x < m) \ |
||
47 | ASSERT(y >= 0) \ |
||
48 | ASSERT(y < m) \ |
||
49 | \ |
||
50 | if (y >= m - x) { \ |
||
51 | return (y - (m - x)); \ |
||
52 | } else { \ |
||
53 | return (x + y); \ |
||
54 | } \ |
||
55 | } \ |
||
56 | |||
57 | DECLARE_BMODADD(int, int) |
||
58 | |||
59 | #endif |