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-rw-r--r--dlink.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/dlink.c b/dlink.c
new file mode 100644
index 0000000..69aa7aa
--- /dev/null
+++ b/dlink.c
@@ -0,0 +1,74 @@
+
+/* doubly linked lists */
+/* This is free software. No strings attached. No copyright claimed */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef __dietlibc__
+char *strncpy(char *dest, const char *src, size_t n) __THROW;
+#endif
+void *xcalloc(size_t num, size_t size);
+#include "dlink.h"
+
+void *dl_head()
+{
+ void *h;
+ h = dl_alloc(0);
+ dl_next(h) = h;
+ dl_prev(h) = h;
+ return h;
+}
+
+void dl_free(void *v)
+{
+ struct __dl_head *vv = v;
+ free(vv-1);
+}
+
+void dl_init(void *v)
+{
+ dl_next(v) = v;
+ dl_prev(v) = v;
+}
+
+void dl_insert(void *head, void *val)
+{
+ dl_next(val) = dl_next(head);
+ dl_prev(val) = head;
+ dl_next(dl_prev(val)) = val;
+ dl_prev(dl_next(val)) = val;
+}
+
+void dl_add(void *head, void *val)
+{
+ dl_prev(val) = dl_prev(head);
+ dl_next(val) = head;
+ dl_next(dl_prev(val)) = val;
+ dl_prev(dl_next(val)) = val;
+}
+
+void dl_del(void *val)
+{
+ if (dl_prev(val) == 0 || dl_next(val) == 0)
+ return;
+ dl_prev(dl_next(val)) = dl_prev(val);
+ dl_next(dl_prev(val)) = dl_next(val);
+ dl_prev(val) = dl_next(val) = 0;
+}
+
+char *dl_strndup(char *s, int l)
+{
+ char *n;
+ if (s == NULL)
+ return NULL;
+ n = dl_newv(char, l+1);
+ strncpy(n, s, l+1);
+ n[l] = 0;
+ return n;
+}
+
+char *dl_strdup(char *s)
+{
+ return dl_strndup(s, (int)strlen(s));
+}