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util: add is_equal to UUID API

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It's going to be useful, in particular, in VMBus code massively using
uuids aka GUIDs.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20171127124355.26015-1-rkagan@virtuozzo.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Roman Kagan 2017-11-27 15:43:55 +03:00 committed by Fam Zheng
parent dbd73b569b
commit bfab1aede0
3 changed files with 15 additions and 2 deletions
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2
include/qemu/uuid.h
View file

@ -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);

8
tests/test-uuid.c
View file

@ -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);

7
util/uuid.c
View file

@ -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)