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-rw-r--r--lib/lib.h9
-rw-r--r--lib/llist.c29
2 files changed, 38 insertions, 0 deletions
diff --git a/lib/lib.h b/lib/lib.h
index 3088f252..d1d7d04f 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -34,6 +34,12 @@ struct double_list {
char *data;
};
+struct num_cache {
+ struct num_cache *next;
+ long long num;
+ char data[];
+};
+
void llist_free_arg(void *node);
void llist_free_double(void *node);
void llist_traverse(void *list, void (*using)(void *node));
@@ -42,6 +48,9 @@ void *dlist_pop(void *list); // actually struct double_list **list
void dlist_add_nomalloc(struct double_list **list, struct double_list *new);
struct double_list *dlist_add(struct double_list **list, char *data);
void *dlist_terminate(void *list);
+struct num_cache *get_num_cache(struct num_cache *cache, long long num);
+struct num_cache *add_num_cache(struct num_cache **cache, long long num,
+ void *data, int len);
// args.c
void get_optflags(void);
diff --git a/lib/llist.c b/lib/llist.c
index 6b4b8f2c..dbb5352a 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -99,3 +99,32 @@ void *dlist_terminate(void *list)
return end;
}
+
+// Find num in cache
+struct num_cache *get_num_cache(struct num_cache *cache, long long num)
+{
+ while (cache) {
+ if (num==cache->num) return cache;
+ cache = cache->next;
+ }
+
+ return 0;
+}
+
+// Uniquely add num+data to cache. Updates *cache, returns pointer to existing
+// entry if it was already there.
+struct num_cache *add_num_cache(struct num_cache **cache, long long num,
+ void *data, int len)
+{
+ struct num_cache *old = get_num_cache(*cache, num);
+
+ if (old) return old;
+
+ old = xzalloc(sizeof(struct num_cache)+len);
+ old->next = *cache;
+ old->num = num;
+ memcpy(old->data, data, len);
+ *cache = old;
+
+ return 0;
+}