[PATCH v5 1/2] btrfs-progs: export util functions about file extent items

[Sidong Yang <realwakka@gmail.com>]

This patch export two functions that convert enum about file extents to
string. It can be used in other code like inspect-internal command. And
this patch also make compress_type_to_str() function more safe by using
strncpy() than strcpy().

Signed-off-by: Sidong Yang <realwakka@gmail.com>
---
 kernel-shared/print-tree.c | 18 +++++++++---------
 kernel-shared/print-tree.h |  5 +++++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/kernel-shared/print-tree.c b/kernel-shared/print-tree.c
index e5d4b453..ce1c0ed3 100644
--- a/kernel-shared/print-tree.c
+++ b/kernel-shared/print-tree.c
@@ -338,27 +338,27 @@ static void print_uuids(struct extent_buffer *eb)
 	printf("fs uuid %s\nchunk uuid %s\n", fs_uuid, chunk_uuid);
 }
 
-static void compress_type_to_str(u8 compress_type, char *ret)
+void btrfs_compress_type_to_str(u8 compress_type, char *ret)
 {
 	switch (compress_type) {
 	case BTRFS_COMPRESS_NONE:
-		strcpy(ret, "none");
+		strncpy(ret, "none", BTRFS_COMPRESS_STR_LEN);
 		break;
 	case BTRFS_COMPRESS_ZLIB:
-		strcpy(ret, "zlib");
+		strncpy(ret, "zlib", BTRFS_COMPRESS_STR_LEN);
 		break;
 	case BTRFS_COMPRESS_LZO:
-		strcpy(ret, "lzo");
+		strncpy(ret, "lzo", BTRFS_COMPRESS_STR_LEN);
 		break;
 	case BTRFS_COMPRESS_ZSTD:
-		strcpy(ret, "zstd");
+		strncpy(ret, "zstd", BTRFS_COMPRESS_STR_LEN);
 		break;
 	default:
-		sprintf(ret, "UNKNOWN.%d", compress_type);
+		snprintf(ret, BTRFS_COMPRESS_STR_LEN, "UNKNOWN.%d", compress_type);
 	}
 }
 
-static const char* file_extent_type_to_str(u8 type)
+const char* btrfs_file_extent_type_to_str(u8 type)
 {
 	switch (type) {
 	case BTRFS_FILE_EXTENT_INLINE: return "inline";
@@ -376,12 +376,12 @@ static void print_file_extent_item(struct extent_buffer *eb,
 	unsigned char extent_type = btrfs_file_extent_type(eb, fi);
 	char compress_str[16];
 
-	compress_type_to_str(btrfs_file_extent_compression(eb, fi),
+	btrfs_compress_type_to_str(btrfs_file_extent_compression(eb, fi),
 			     compress_str);
 
 	printf("\t\tgeneration %llu type %hhu (%s)\n",
 			btrfs_file_extent_generation(eb, fi),
-			extent_type, file_extent_type_to_str(extent_type));
+			extent_type, btrfs_file_extent_type_to_str(extent_type));
 
 	if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 		printf("\t\tinline extent data size %u ram_bytes %llu compression %hhu (%s)\n",
diff --git a/kernel-shared/print-tree.h b/kernel-shared/print-tree.h
index 80fb6ef7..3b96e89d 100644
--- a/kernel-shared/print-tree.h
+++ b/kernel-shared/print-tree.h
@@ -33,6 +33,8 @@ enum {
 	BTRFS_PRINT_TREE_DEFAULT = BTRFS_PRINT_TREE_BFS,
 };
 
+#define BTRFS_COMPRESS_STR_LEN 12
+
 void btrfs_print_tree(struct extent_buffer *eb, unsigned int mode);
 void btrfs_print_leaf(struct extent_buffer *eb, unsigned int mode);
 
@@ -43,4 +45,7 @@ void print_objectid(FILE *stream, u64 objectid, u8 type);
 void print_key_type(FILE *stream, u64 objectid, u8 type);
 void btrfs_print_superblock(struct btrfs_super_block *sb, int full);
 
+void btrfs_compress_type_to_str(u8 compress_type, char *ret);
+const char* btrfs_file_extent_type_to_str(u8 type);
+
 #endif
-- 
2.25.1