Re: [Qemu-devel] [PATCH v2] util: add is_equal to UUID API

[Fam Zheng <famz@redhat.com>]

On Mon, 11/27 15:43, Roman Kagan wrote:
> It's going to be useful, in particular, in VMBus code massively using
> uuids aka GUIDs.
> 
> Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
> ---
> v1 -> v2:
>  - drop dedicated testcase (for it was of no value) and incorporate
>    is_null and is_equal assertions into uuid_generate testcase
> 
>  include/qemu/uuid.h | 2 ++
>  tests/test-uuid.c   | 8 +++++++-
>  util/uuid.c         | 7 ++++++-
>  3 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/include/qemu/uuid.h b/include/qemu/uuid.h
> index afe4840296..09489ce5c5 100644
> --- a/include/qemu/uuid.h
> +++ b/include/qemu/uuid.h
> @@ -48,6 +48,8 @@ void qemu_uuid_generate(QemuUUID *out);
>  
>  int qemu_uuid_is_null(const QemuUUID *uu);
>  
> +int qemu_uuid_is_equal(const QemuUUID *lhv, const QemuUUID *rhv);
> +
>  void qemu_uuid_unparse(const QemuUUID *uuid, char *out);
>  
>  char *qemu_uuid_unparse_strdup(const QemuUUID *uuid);
> diff --git a/tests/test-uuid.c b/tests/test-uuid.c
> index d3a2791fd4..22b4b0727d 100644
> --- a/tests/test-uuid.c
> +++ b/tests/test-uuid.c
> @@ -93,12 +93,18 @@ static inline bool uuid_is_valid(QemuUUID *uuid)
>  
>  static void test_uuid_generate(void)
>  {
> +    QemuUUID uuid_not_null = { { {
> +        0x58, 0x6e, 0xce, 0x27, 0x7f, 0x09, 0x41, 0xe0,
> +        0x9e, 0x74, 0xe9, 0x01, 0x31, 0x7e, 0x9d, 0x42
> +    } } };
>      QemuUUID uuid;
>      int i;
>  
>      for (i = 0; i < 100; ++i) {
>          qemu_uuid_generate(&uuid);
>          g_assert(uuid_is_valid(&uuid));
> +        g_assert_false(qemu_uuid_is_null(&uuid));
> +        g_assert_false(qemu_uuid_is_equal(&uuid_not_null, &uuid));
>      }
>  }
>  
> @@ -168,8 +174,8 @@ static void test_uuid_unparse_strdup(void)
>  int main(int argc, char **argv)
>  {
>      g_test_init(&argc, &argv, NULL);
> -    g_test_add_func("/uuid/generate", test_uuid_generate);
>      g_test_add_func("/uuid/is_null", test_uuid_is_null);
> +    g_test_add_func("/uuid/generate", test_uuid_generate);
>      g_test_add_func("/uuid/parse", test_uuid_parse);
>      g_test_add_func("/uuid/unparse", test_uuid_unparse);
>      g_test_add_func("/uuid/unparse_strdup", test_uuid_unparse_strdup);
> diff --git a/util/uuid.c b/util/uuid.c
> index dd6b5fdf05..ebf06c049a 100644
> --- a/util/uuid.c
> +++ b/util/uuid.c
> @@ -41,7 +41,12 @@ void qemu_uuid_generate(QemuUUID *uuid)
>  int qemu_uuid_is_null(const QemuUUID *uu)
>  {
>      static QemuUUID null_uuid;
> -    return memcmp(uu, &null_uuid, sizeof(QemuUUID)) == 0;
> +    return qemu_uuid_is_equal(uu, &null_uuid);
> +}
> +
> +int qemu_uuid_is_equal(const QemuUUID *lhv, const QemuUUID *rhv)
> +{
> +    return memcmp(lhv, rhv, sizeof(QemuUUID)) == 0;
>  }
>  
>  void qemu_uuid_unparse(const QemuUUID *uuid, char *out)
> -- 
> 2.14.3
> 

Thanks, queued. Will send a pull request once next release dev window opens.

Fam