Archipelago » qemu

#ifndef QEMU_RANGE_H

#define QEMU_RANGE_H

/* Get last byte of a range from offset + length.

 * Undefined for ranges that wrap around 0. */

static inline uint64_t range_get_last(uint64_t offset, uint64_t len)

{

    return offset + len - 1;

}

/* Check whether a given range covers a given byte. */

static inline int range_covers_byte(uint64_t offset, uint64_t len,

                                    uint64_t byte)

{

    return offset <= byte && byte <= range_get_last(offset, len);

}

/* Check whether 2 given ranges overlap.

 * Undefined if ranges that wrap around 0. */

static inline int ranges_overlap(uint64_t first1, uint64_t len1,

                                 uint64_t first2, uint64_t len2)

{

    uint64_t last1 = range_get_last(first1, len1);

    uint64_t last2 = range_get_last(first2, len2);

    return !(last2 < first1 || last1 < first2);

}

#endif