From 705801c1c2ce97531be392e6bd553c9671fdcb1e Mon Sep 17 00:00:00 2001
From: David Champion <dgc@bikeshed.us>
Date: Sat, 28 Jan 2017 18:47:41 -0800
Subject: [PATCH] Add reentrant hash_walk() function for iterating down a hash
 table.

---
 hash.c | 27 +++++++++++++++++++++++++++
 hash.h |  7 +++++++
 2 files changed, 34 insertions(+)

diff --git a/hash.c b/hash.c
index c8dbaeba..d87a3218 100644
--- a/hash.c
+++ b/hash.c
@@ -297,3 +297,30 @@ void hash_destroy (HASH **ptr, void (*destroy) (void *))
   FREE (&pptr->table);
   FREE (ptr);		/* __FREE_CHECKED__ */
 }
+
+struct hash_elem *hash_walk(const HASH *table, struct hash_walk_state *state)
+{
+  if (state->last && state->last->next)
+  {
+    state->last = state->last->next;
+    return state->last;
+  }
+
+  if (state->last)
+    state->index++;
+
+  while (state->index < table->nelem)
+  {
+    if (table->table[state->index])
+    {
+      state->last = table->table[state->index];
+      return state->last;
+    }
+    state->index++;
+  } 
+
+  state->index = 0;
+  state->last = NULL;
+  return NULL;
+}
+
diff --git a/hash.h b/hash.h
index 3aa5b605..ce2a5d69 100644
--- a/hash.h
+++ b/hash.h
@@ -64,4 +64,11 @@ void int_hash_delete (HASH * table, unsigned int key, const void *data,
 
 void hash_destroy (HASH ** hash, void (*destroy) (void *));
 
+struct hash_walk_state {
+  int index;
+  struct hash_elem *last;
+};
+
+struct hash_elem *hash_walk(const HASH *table, struct hash_walk_state *state);
+
 #endif
-- 
2.40.0