From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Mon, 14 Jun 2021 09:17:53 +0000 (+0200)
Subject: Add inventory_find
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=eaa7e66f3c11ecbe01f28dbc2b32271f4229438b;p=dungeon_game.git

Add inventory_find
---

diff --git a/plugins/inventory/inventory.c b/plugins/inventory/inventory.c
index 9923561..66f663e 100644
--- a/plugins/inventory/inventory.c
+++ b/plugins/inventory/inventory.c
@@ -75,8 +75,10 @@ bool inventory_remove(struct inventory *self, struct itemstack *stack)
 
 */
 
-static void decrease_item_count(struct list **ptr, struct itemstack *stack)
+static void decrease_item_count(struct list **ptr)
 {
+	struct itemstack *stack = (*ptr)->element;
+
 	stack->count--;
 
 	if (stack->count == 0) {
@@ -95,21 +97,36 @@ static void decrease_item_count(struct list **ptr, struct itemstack *stack)
 	}
 }
 
-bool inventory_remove(struct inventory *self, struct item *item)
+static struct list **find_item(struct inventory *self, struct item *item)
 {
 	for (struct list **ptr = &self->stacks; *ptr != NULL; ptr = &(*ptr)->next) {
 		struct itemstack *stack = (*ptr)->element;
 
-		if (stack->item == item) {
-			decrease_item_count(ptr, stack);
+		if (stack->item == item)
+			return ptr;
+	}
+
+	return NULL;
+}
 
-			return true;
-		}
+bool inventory_remove(struct inventory *self, struct item *item)
+{
+	struct list **ptr = find_item(self, item);
+
+	if (ptr) {
+		decrease_item_count(ptr);
+		return true;
 	}
 
 	return false;
 }
 
+struct itemstack *inventory_find(struct inventory *self, struct item *item)
+{
+	struct list **ptr = find_item(self, item);
+	return ptr ? (*ptr)->element : NULL;
+}
+
 static void handle_enter()
 {
 	int i = 0;
@@ -119,7 +136,7 @@ static void handle_enter()
 			struct itemstack *stack = (*ptr)->element;
 
 			if (stack->item->on_use && stack->item->on_use(stack))
-				decrease_item_count(ptr, stack);
+				decrease_item_count(ptr);
 
 			return;
 		}
diff --git a/plugins/inventory/inventory.h b/plugins/inventory/inventory.h
index 437ffb6..62de9dc 100644
--- a/plugins/inventory/inventory.h
+++ b/plugins/inventory/inventory.h
@@ -26,6 +26,7 @@ struct inventory
 
 void inventory_add(struct inventory *self, struct itemstack stack);
 bool inventory_remove(struct inventory *self, struct item *item);
+struct itemstack *inventory_find(struct inventory *self, struct item *item);
 
 extern struct inventory player_inventory;
 #endif