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Introduce signed range.

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Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

MST: split up patch
This commit is contained in:
Hu Tao 2014-05-14 17:43:30 +08:00 committed by Michael S. Tsirkin
parent a99d57bb6a
commit 7f8f9ef1da
1 changed files with 72 additions and 0 deletions
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72
include/qemu/range.h
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@ -3,6 +3,7 @@
#include <inttypes.h>
#include <qemu/typedefs.h>
#include "qemu/queue.h"
/*
* Operations on 64 bit address ranges.
@ -60,4 +61,75 @@ static inline int ranges_overlap(uint64_t first1, uint64_t len1,
return !(last2 < first1 || last1 < first2);
}
/* 0,1 can merge with 1,2 but don't overlap */
static inline bool ranges_can_merge(Range *range1, Range *range2)
{
return !(range1->end < range2->begin || range2->end < range1->begin);
}
static inline int range_merge(Range *range1, Range *range2)
{
if (ranges_can_merge(range1, range2)) {
if (range1->end < range2->end) {
range1->end = range2->end;
}
if (range1->begin > range2->begin) {
range1->begin = range2->begin;
}
return 0;
}
return -1;
}
static inline GList *g_list_insert_sorted_merged(GList *list,
gpointer data,
GCompareFunc func)
{
GList *l, *next = NULL;
Range *r, *nextr;
if (!list) {
list = g_list_insert_sorted(list, data, func);
return list;
}
nextr = data;
l = list;
while (l && l != next && nextr) {
r = l->data;
if (ranges_can_merge(r, nextr)) {
range_merge(r, nextr);
l = g_list_remove_link(l, next);
next = g_list_next(l);
if (next) {
nextr = next->data;
} else {
nextr = NULL;
}
} else {
l = g_list_next(l);
}
}
if (!l) {
list = g_list_insert_sorted(list, data, func);
}
return list;
}
static inline gint range_compare(gconstpointer a, gconstpointer b)
{
Range *ra = (Range *)a, *rb = (Range *)b;
if (ra->begin == rb->begin && ra->end == rb->end) {
return 0;
} else if (range_get_last(ra->begin, ra->end) <
range_get_last(rb->begin, rb->end)) {
return -1;
} else {
return 1;
}
}
#endif