tag: converted tag_item.value to a char array

The value is stored in the same memory allocation as the tag_item
struct; this saves memory because we do not store the value pointer
anymore.  Also remove the getTagItemString()/removeTagItemString()
dummies.

src/tag.c

@@ -248,7 +248,6 @@ static void deleteItem(struct tag *tag, int idx)
 	assert(idx < tag->numOfItems);
 	tag->numOfItems--;
 
-	removeTagItemString(tag->items[idx]->type, tag->items[idx]->value);
 	free(tag->items[idx]);
 	/* free(tag->items[idx].value); */
 
@@ -284,7 +283,6 @@ static void clearMpdTag(struct tag *tag)
 	int i;
 
 	for (i = 0; i < tag->numOfItems; i++) {
-		removeTagItemString(tag->items[i]->type, tag->items[i]->value);
 		/* free(tag->items[i].value); */
 		free(tag->items[i]);
 	}
@@ -374,9 +372,10 @@ static void appendToTagItems(struct tag *tag, enum tag_type type,
 	tag->items = xrealloc(tag->items,
 			      tag->numOfItems * sizeof(*tag->items));
 
-	tag->items[i] = xmalloc(sizeof(*tag->items[i]));
+	len = strlen(duplicated);
+	tag->items[i] = xmalloc(sizeof(*tag->items[i]) + len);
 	tag->items[i]->type = type;
-	tag->items[i]->value = getTagItemString(type, duplicated);
+	memcpy(tag->items[i]->value, duplicated, len + 1);
 
 	free(duplicated);
 }

src/tag.h

@@ -41,8 +41,8 @@ extern const char *mpdTagItemKeys[];
 
 struct tag_item {
 	enum tag_type type;
-	char *value;
+	char value[1];
-};
+} mpd_unused;
 
 struct tag {
 	int time;

src/tagTracker.c

@@ -37,16 +37,6 @@ struct visited {
 static struct visited *visited_heads[TAG_NUM_OF_ITEM_TYPES];
 static unsigned num_visited[TAG_NUM_OF_ITEM_TYPES];
 
-char *getTagItemString(int type mpd_unused, char *string)
-{
-	return xstrdup(string);
-}
-
-void removeTagItemString(int type mpd_unused, char *string)
-{
-	free(string);
-}
-
 static int visit_tag_items(int fd mpd_unused, Song *song, void *data)
 {
 	enum tag_type type = (enum tag_type)(size_t)data;

src/tagTracker.h

@@ -19,10 +19,6 @@
 #ifndef TAG_TRACKER_H
 #define TAG_TRACKER_H
 
-char *getTagItemString(int type, char *string);
-
-void removeTagItemString(int type, char *string);
-
 int getNumberOfTagItems(int type);
 
 void printMemorySavedByTagTracker(void);