[1/2] find ptr in a list

["Christopher Li" <sparse@chrisli.org>]

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Signed-Off-By: Christopher Li <sparse@chrisli.org>

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Adding some helper function to find a pointer in the ptrlist.

Index: sparse/ptrlist.h
===================================================================
--- sparse.orig/ptrlist.h
+++ sparse/ptrlist.h
@@ -45,6 +45,8 @@ extern void concat_ptr_list(struct ptr_l
 extern void __free_ptr_list(struct ptr_list **);
 extern int ptr_list_size(struct ptr_list *);
 extern int linearize_ptr_list(struct ptr_list *, void **, int);
+extern int find_ptr_in_list(struct ptr_list* list, void *ptr);
+extern int find_ptr_index(struct ptr_list* list, void *ptr);
 
 /*
  * Hey, who said that you can't do overloading in C?
Index: sparse/ptrlist.c
===================================================================
--- sparse.orig/ptrlist.c
+++ sparse/ptrlist.c
@@ -246,3 +246,29 @@ void __free_ptr_list(struct ptr_list **l
 
 	*listp = NULL;
 }
+
+int find_ptr_in_list(struct ptr_list* list, void *ptr)
+{
+	void *p;
+	FOR_EACH_PTR(list, p) {
+		if (p == ptr)
+			return 1;
+	} END_FOR_EACH_PTR(p);
+	return 0;
+}
+
+int find_ptr_index(struct ptr_list* list, void *ptr)
+{
+	void *p;
+	int i = 0;
+	FOR_EACH_PTR(list, p) {
+		if (p == ptr)
+			return i;
+		i++;
+	} END_FOR_EACH_PTR(p);
+	return -1;
+}
+
+
+
+