On 06/19/2015 02:19 PM, James Carter wrote:
> This function returns true if there is a common bit that is set
> in both bitmaps.
>
> Signed-off-by: James Carter <jwcart2@xxxxxxxxxxxxx>
Acked-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
> ---
> libsepol/include/sepol/policydb/ebitmap.h | 1 +
> libsepol/src/ebitmap.c | 22 ++++++++++++++++++++++
> 2 files changed, 23 insertions(+)
>
> diff --git a/libsepol/include/sepol/policydb/ebitmap.h b/libsepol/include/sepol/policydb/ebitmap.h
> index 801438c..7b3508d 100644
> --- a/libsepol/include/sepol/policydb/ebitmap.h
> +++ b/libsepol/include/sepol/policydb/ebitmap.h
> @@ -86,6 +86,7 @@ extern unsigned int ebitmap_cardinality(ebitmap_t *e1);
> extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2);
> extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src);
> extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2);
> +extern int ebitmap_match_any(const ebitmap_t *e1, const ebitmap_t *e2);
> extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit);
> extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value);
> extern void ebitmap_destroy(ebitmap_t * e);
> diff --git a/libsepol/src/ebitmap.c b/libsepol/src/ebitmap.c
> index be6b591..58f2fc4 100644
> --- a/libsepol/src/ebitmap.c
> +++ b/libsepol/src/ebitmap.c
> @@ -224,6 +224,28 @@ int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2)
> return 1;
> }
>
> +int ebitmap_match_any(const ebitmap_t *e1, const ebitmap_t *e2)
> +{
> + ebitmap_node_t *n1 = e1->node;
> + ebitmap_node_t *n2 = e2->node;
> +
> + while (n1 && n2) {
> + if (n1->startbit < n2->startbit) {
> + n1 = n1->next;
> + } else if (n2->startbit < n1->startbit) {
> + n2 = n2->next;
> + } else {
> + if (n1->map & n2->map) {
> + return 1;
> + }
> + n1 = n1->next;
> + n2 = n2->next;
> + }
> + }
> +
> + return 0;
> +}
> +
> int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit)
> {
> ebitmap_node_t *n;
>
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