BadVPN – Blame information for rev 1
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| 1 | office | 1 | /** |
| 2 | * @file offset.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 | * Macros for determining offsets of members in structs. |
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| 32 | */ |
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| 33 | |||
| 34 | #ifndef BADVPN_MISC_OFFSET_H |
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| 35 | #define BADVPN_MISC_OFFSET_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 | * Returns a pointer to a struct, given a pointer to its member. |
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| 42 | */ |
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| 43 | #define UPPER_OBJECT(_ptr, _object_type, _field_name) ((_object_type *)((char *)(_ptr) - offsetof(_object_type, _field_name))) |
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| 44 | |||
| 45 | /** |
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| 46 | * Returns the offset of one struct member from another. |
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| 47 | * Expands to an int. |
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| 48 | */ |
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| 49 | #define OFFSET_DIFF(_object_type, _field1, _field2) ((int)offsetof(_object_type, _field1) - (int)offsetof(_object_type, _field2)) |
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| 50 | |||
| 51 | #endif |