1 files changed, 55 insertions, 0 deletions
diff --git a/src/idlist.c b/src/idlist.c
new file mode 100644
index 0000000..5b4d99b
--- /dev/null
+++ b/src/idlist.c
@@ -0,0 +1,55 @@
+#include <stdlib.h>
+#include "idlist.h"
+
+struct idlist *list_new()
+{
+    struct idlist *list = calloc(1, sizeof(struct idlist));
+    list->id = 1;
+    return list;
+}
+
+struct idlist *list_append(struct idlist *list)
+{
+    if (!list)
+        return list;
+    struct idlist *last = list;
+    while (last->next)
+        last = last->next;
+    last->next = calloc(1, sizeof(struct idlist));
+    last->next->id = last->id + 1;
+    last->next->prev = last;
+    return last->next;
+}
+
+struct idlist *list_get(const struct idlist *list, unsigned long id)
+{
+    const struct idlist *sought = list;
+    if (sought) {
+        if (sought->id == id)
+            return (struct idlist *)sought;
+        while ((sought = sought->next))
+            if (sought->id == id)
+                return (struct idlist *)sought;
+    }
+    return NULL;
+}
+
+void list_rm_node(struct idlist *node)
+{
+    if (node) {
+        if (node->prev)
+            node->prev->next = node->next;
+        if (node->next)
+            node->next->prev = node->prev;
+        free(node);
+    }
+}
+
+void list_foreach(struct idlist *list, void (*job)(void *))
+{
+    if (list) {
+        job(list->obj);
+        while ((list = list->next))
+            job(list->obj);
+    }
+}