util: Added function to find specific UUID in UUID list.

Finds a given UUID in the UUID list returned by identify UUID.

Signed-off-by: Leonardo da Cunha <[email protected]>

Author: lgdacunh

src/libnvme.map

@@ -1,4 +1,9 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
+LIBNVME_1_8 {
+	global:
+		nvme_uuid_find;
+};
+
 LIBNVME_1_7 {
 	global:
 		nvme_init_copy_range_f2;

src/nvme/util.c

@@ -951,6 +951,25 @@ int nvme_uuid_random(unsigned char uuid[NVME_UUID_LEN])
 	return 0;
 }
 
+int nvme_uuid_find(struct nvme_id_uuid_list *uuid_list, const unsigned char uuid[NVME_UUID_LEN])
+{
+	const unsigned char uuid_end[NVME_UUID_LEN] = {0};
+
+	if ((!uuid_list) || (!uuid)) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	for (int i = 0; i < NVME_ID_UUID_LIST_MAX; i++) {
+		if (memcmp(uuid, &uuid_list->entry[i].uuid, NVME_UUID_LEN) == 0)
+			return i + 1;
+		if (memcmp(uuid_end, &uuid_list->entry[i].uuid, NVME_UUID_LEN) == 0)
+			break;
+	}
+	errno = ENOENT;
+	return -1;
+}
+
 #ifdef HAVE_NETDB
 static bool _nvme_ipaddrs_eq(struct sockaddr *addr1, struct sockaddr *addr2)
 {

src/nvme/util.h

@@ -666,6 +666,15 @@ int nvme_uuid_from_string(const char *str, unsigned char uuid[NVME_UUID_LEN]);
  */
 int nvme_uuid_random(unsigned char uuid[NVME_UUID_LEN]);
 
+/**
+ * nvme_uuid_find - Find UUID position on UUID list
+ * @uuid_list:	UUID list returned by identify UUID
+ * @uuid:	Binary encoded input UUID
+ *
+ * Return: The array position where given UUID is present, or -1 on failure with errno set.
+ */
+int nvme_uuid_find(struct nvme_id_uuid_list *uuid_list, const unsigned char uuid[NVME_UUID_LEN]);
+
 /**
  * nvme_ipaddrs_eq - Check if 2 IP addresses are equal.
  * @addr1: IP address (can be IPv4 or IPv6)