| /* |
| * Copyright (c) 2019-2021 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef PAS_RANGE_H |
| #define PAS_RANGE_H |
| |
| #include "pas_utils.h" |
| |
| PAS_BEGIN_EXTERN_C; |
| |
| struct pas_range; |
| typedef struct pas_range pas_range; |
| |
| struct pas_range { |
| uintptr_t begin; |
| uintptr_t end; |
| }; |
| |
| static inline pas_range pas_range_create(uintptr_t begin, uintptr_t end) |
| { |
| pas_range result; |
| PAS_ASSERT(end >= begin); |
| result.begin = begin; |
| result.end = end; |
| return result; |
| } |
| |
| static inline pas_range pas_range_create_empty(void) |
| { |
| return pas_range_create(0, 0); |
| } |
| |
| static inline pas_range pas_range_create_forgiving(uintptr_t begin, uintptr_t end) |
| { |
| if (end < begin) |
| return pas_range_create_empty(); |
| return pas_range_create(begin, end); |
| } |
| |
| static inline bool pas_range_is_empty(pas_range range) |
| { |
| return range.begin == range.end; |
| } |
| |
| static inline size_t pas_range_size(pas_range range) |
| { |
| PAS_ASSERT(range.end >= range.begin); |
| return range.end - range.begin; |
| } |
| |
| static inline bool pas_range_contains(pas_range left, uintptr_t right) |
| { |
| return right >= left.begin && right < left.end; |
| } |
| |
| static inline bool pas_range_subsumes(pas_range left, pas_range right) |
| { |
| if (pas_range_is_empty(right)) |
| return true; |
| return right.begin >= left.begin && right.end <= left.end; |
| } |
| |
| static inline bool pas_range_overlaps(pas_range left, pas_range right) |
| { |
| return pas_ranges_overlap(left.begin, left.end, |
| right.begin, right.end); |
| } |
| |
| static inline pas_range pas_range_create_intersection(pas_range left, pas_range right) |
| { |
| if (!pas_range_overlaps(left, right)) |
| return pas_range_create_empty(); |
| |
| return pas_range_create(PAS_MAX(left.begin, right.begin), |
| PAS_MIN(left.end, right.end)); |
| } |
| |
| static inline int pas_range_compare(pas_range left, pas_range right) |
| { |
| if (pas_range_overlaps(left, right)) |
| return 0; |
| |
| if (left.begin < right.begin) |
| return -1; |
| return 1; |
| } |
| |
| PAS_END_EXTERN_C; |
| |
| #endif /* PAS_RANGE_H */ |
| |