[PATCH 1/3] lib/uuid.c: change prototype of uuid_guid_get_str()

[Rasmus Villemoes]

There's no reason to require an appropriately sized output parameter
for the string, that's error-prone should the table ever grow an
element with a longer string. We can just return the const char*
pointer directly.

Update the only caller accordingly, and get rid of pointless ifdeffery
in the header so that the compiler always sees a declaration and can
thus do type-checking, whether or not PARTITION_TYPE_GUID is enabled
or not.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
 disk/part_efi.c |  9 +++++----
 include/uuid.h  |  4 +---
 lib/uuid.c      | 11 +++++------
 3 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/disk/part_efi.c b/disk/part_efi.c
index 60b1c1d761..2f922662e6 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -247,10 +247,11 @@ void part_print_efi(struct blk_desc *dev_desc)
 		uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
 		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
 		printf("\ttype:\t%s\n", uuid);
-#ifdef CONFIG_PARTITION_TYPE_GUID
-		if (!uuid_guid_get_str(uuid_bin, uuid))
-			printf("\ttype:\t%s\n", uuid);
-#endif
+		if (CONFIG_IS_ENABLED(PARTITION_TYPE_GUID)) {
+			const char *type = uuid_guid_get_str(uuid_bin);
+			if (type)
+				printf("\ttype:\t%s\n", type);
+		}
 		uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
 		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
 		printf("\tguid:\t%s\n", uuid);
diff --git a/include/uuid.h b/include/uuid.h
index 73c5a89ec7..0c653cb087 100644
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -39,10 +39,8 @@ int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
 		    int str_format);
 void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
 		     int str_format);
-#ifdef CONFIG_PARTITION_TYPE_GUID
 int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
-int uuid_guid_get_str(const unsigned char *guid_bin, char *guid_str);
-#endif
+const char *uuid_guid_get_str(const unsigned char *guid_bin);
 void gen_rand_uuid(unsigned char *uuid_bin);
 void gen_rand_uuid_str(char *uuid_str, int str_format);
 #endif
diff --git a/lib/uuid.c b/lib/uuid.c
index e62d5ca264..6cfb6cd449 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -122,20 +122,19 @@ int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin)
  * uuid_guid_get_str() - this function get string for GUID.
  *
  * @param guid_bin - pointer to string with partition type guid [16B]
- * @param guid_str - pointer to allocated partition type string [7B]
+ *
+ * Returns NULL if the type GUID is not known.
  */
-int uuid_guid_get_str(const unsigned char *guid_bin, char *guid_str)
+const char *uuid_guid_get_str(const unsigned char *guid_bin)
 {
 	int i;
 
-	*guid_str = 0;
 	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
 		if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
-			strcpy(guid_str, list_guid[i].string);
-			return 0;
+			return list_guid[i].string;
 		}
 	}
-	return -ENODEV;
+	return NULL;
 }
 #endif
 
-- 
2.23.0