BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file balign.h |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Integer alignment macros. |
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32 | */ |
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33 | |||
34 | #ifndef BADVPN_MISC_BALIGN_H |
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35 | #define BADVPN_MISC_BALIGN_H |
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36 | |||
37 | #include <stddef.h> |
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38 | #include <stdint.h> |
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39 | |||
40 | /** |
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41 | * Checks if aligning x up to n would overflow. |
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42 | */ |
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43 | static int balign_up_overflows (size_t x, size_t n) |
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44 | { |
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45 | size_t r = x % n; |
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46 | |||
47 | return (r && x > SIZE_MAX - (n - r)); |
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48 | } |
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49 | |||
50 | /** |
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51 | * Aligns x up to n. |
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52 | */ |
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53 | static size_t balign_up (size_t x, size_t n) |
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54 | { |
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55 | size_t r = x % n; |
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56 | return (r ? x + (n - r) : x); |
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57 | } |
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58 | |||
59 | /** |
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60 | * Aligns x down to n. |
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61 | */ |
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62 | static size_t balign_down (size_t x, size_t n) |
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63 | { |
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64 | return (x - (x % n)); |
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65 | } |
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66 | |||
67 | /** |
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68 | * Calculates the quotient of a and b, rounded up. |
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69 | */ |
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70 | static size_t bdivide_up (size_t a, size_t b) |
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71 | { |
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72 | size_t r = a % b; |
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73 | return (r > 0 ? a / b + 1 : a / b); |
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74 | } |
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75 | |||
76 | #endif |