1 files changed, 27 insertions, 0 deletions
diff --git a/src/libdatastruct/genset.c b/src/libdatastruct/genset.c
new file mode 100644
index 0000000..8d750b7
--- /dev/null
+++ b/src/libdatastruct/genset.c
@@ -0,0 +1,27 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/genset.h>
+
+void genset_init (genset_ref x, void *storage, unsigned int *freelist, unsigned int esize, unsigned int max)
+{
+  register unsigned int i = 0 ;
+  x->storage = (char *)storage ;
+  x->freelist = freelist ;
+  x->esize = esize ;
+  x->max = max ;
+  x->sp = max ;
+  for (; i < max ; i++) freelist[i] = max - 1 - i ;
+}
+
+unsigned int genset_new (genset_ref x)
+{
+  return x->sp ? x->freelist[--x->sp] : (errno = ENOSPC, x->max) ;
+}
+
+int genset_delete (genset_ref x, unsigned int i)
+{
+  if ((i >= x->max) || (x->sp >= x->max)) return (errno = EINVAL, 0) ;
+  x->freelist[x->sp++] = i ;
+  return 1 ;
+}