const pointers

src/tag.c

@@ -101,7 +101,7 @@ void tag_print_types(int fd)
 	}
 }
 
-void tag_print(int fd, struct tag *tag)
+void tag_print(int fd, const struct tag *tag)
 {
 	int i;
 
@@ -114,7 +114,7 @@ void tag_print(int fd, struct tag *tag)
 	}
 }
 
-struct tag *tag_ape_load(char *file)
+struct tag *tag_ape_load(const char *file)
 {
 	struct tag *ret = NULL;
 	FILE *fp;
@@ -303,7 +303,7 @@ void tag_free(struct tag *tag)
 	free(tag);
 }
 
-struct tag *tag_dup(struct tag *tag)
+struct tag *tag_dup(const struct tag *tag)
 {
 	struct tag *ret;
 	int i;
@@ -321,7 +321,7 @@ struct tag *tag_dup(struct tag *tag)
 	return ret;
 }
 
-int tag_equal(struct tag *tag1, struct tag *tag2)
+int tag_equal(const struct tag *tag1, const struct tag *tag2)
 {
 	int i;
 

src/tag.h

@@ -51,7 +51,7 @@ struct tag {
 	mpd_uint8 numOfItems;
 };
 
-struct tag *tag_ape_load(char *file);
+struct tag *tag_ape_load(const char *file);
 
 struct tag *tag_new(void);
 
@@ -86,10 +86,10 @@ static inline void tag_add_item(struct tag *tag, enum tag_type itemType,
 
 void tag_print_types(int fd);
 
-void tag_print(int fd, struct tag *tag);
+void tag_print(int fd, const struct tag *tag);
 
-struct tag *tag_dup(struct tag *tag);
+struct tag *tag_dup(const struct tag *tag);
 
-int tag_equal(struct tag *tag1, struct tag *tag2);
+int tag_equal(const struct tag *tag1, const struct tag *tag2);
 
 #endif

src/tag_id3.c

@@ -338,7 +338,7 @@ static struct id3_tag *findId3TagFromEnd(FILE * stream)
 }
 #endif
 
-struct tag *tag_id3_load(char *file)
+struct tag *tag_id3_load(const char *file)
 {
 	struct tag *ret = NULL;
 #ifdef HAVE_ID3TAG

src/tag_id3.h

@@ -28,6 +28,6 @@ struct id3_tag;
 struct tag *tag_id3_import(struct id3_tag *);
 #endif
 
-struct tag *tag_id3_load(char *file);
+struct tag *tag_id3_load(const char *file);
 
 #endif