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author | Paolo Bonzini <pbonzini@redhat.com> | 2012-12-17 18:20:00 +0100 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2012-12-19 08:32:39 +0100 |
commit | 1de7afc984b49af164e2619e6850b9732b173b34 (patch) | |
tree | 60cd16f527440fcfcdb81d9bea1af5d9147604c4 /include/qemu/range.h | |
parent | 14cccb618508a0aa70eb9ccf366703a019a45ff0 (diff) | |
download | hqemu-1de7afc984b49af164e2619e6850b9732b173b34.zip hqemu-1de7afc984b49af164e2619e6850b9732b173b34.tar.gz |
misc: move include files to include/qemu/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/qemu/range.h')
-rw-r--r-- | include/qemu/range.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/qemu/range.h b/include/qemu/range.h new file mode 100644 index 0000000..3502372 --- /dev/null +++ b/include/qemu/range.h @@ -0,0 +1,29 @@ +#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 |