1 files changed, 26 insertions, 0 deletions
diff --git a/src/libdatastruct/gensetdyn_ready.c b/src/libdatastruct/gensetdyn_ready.c
new file mode 100644
index 0000000..d1cfd9f
--- /dev/null
+++ b/src/libdatastruct/gensetdyn_ready.c
@@ -0,0 +1,26 @@
+/* ISC license. */
+
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/gensetdyn.h>
+
+int gensetdyn_ready (gensetdyn_ref g, unsigned int n)
+{
+  int wasnull = !g->storage.s ;
+  unsigned int i = g->storage.len ;
+  if (n < i) return 1 ;
+  n += g->base + (n * g->fracnum) / g->fracden ;
+  if (!stralloc_ready_tuned(&g->storage, n * g->esize, 0, 0, 1)) return 0 ;
+  if (!genalloc_ready(unsigned int, &g->freelist, n))
+  {
+    if (wasnull) stralloc_free(&g->storage) ;
+    return 0 ;
+  }
+  for (; i < n ; i++)
+  {
+    unsigned int j = n - 1 - i + g->storage.len ;
+    genalloc_catb(unsigned int, &g->freelist, &j, 1) ;
+  }
+  g->storage.len = n ;
+  return 1 ;
+}