From 3853f385d261626791f3cf397ed4806d920590da Mon Sep 17 00:00:00 2001
From: David McMackins II <contact@mcmackins.org>
Date: Tue, 25 Feb 2020 21:13:37 -0600
Subject: Add pt_copy

---
 Makefile       |  2 +-
 pfxtree-test.c |  9 +++++++--
 pfxtree.c      | 30 +++++++++++++++++++++++++++++-
 pfxtree.h      |  8 ++++++++
 4 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 2b0bcdd..5790896 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ PKGCONFIGDIR=$(LIBDIR)/pkgconfig
 HDIR=$(DESTDIR)$(PREFIX)/include
 
 MAJOR=0
-MINOR=3
+MINOR=4
 REVISION=0
 VERSION=$(MAJOR).$(MINOR).$(REVISION)
 
diff --git a/pfxtree-test.c b/pfxtree-test.c
index 345b7bc..acabca9 100644
--- a/pfxtree-test.c
+++ b/pfxtree-test.c
@@ -55,7 +55,7 @@ check_entry(const struct pt_entry *entry, void *data)
 int
 main(void)
 {
-	PrefixTree *p = pt_new();
+	PrefixTree *p = pt_new(), *p2;
 	void *dummy;
 	assert(p != NULL);
 
@@ -71,7 +71,7 @@ main(void)
 	assert(NULL == pt_search(p, "hello"));
 	assert(pt_search(p, "hell") != NULL);
 
-	dummy = malloc(0xDFDF);
+	dummy = malloc(16);
 	assert(dummy != NULL);
 	assert(0 == pt_add_p(p, "hello", dummy));
 	assert(PT_TYPE_PTR == pt_data_type(pt_search(p, "hello")));
@@ -80,6 +80,11 @@ main(void)
 
 	pt_foreach(p, check_entry, dummy);
 
+	p2 = pt_copy(p);
+	assert(p2 != NULL);
+	assert(pt_data_p(pt_search(p2, "hello")) == dummy);
+
 	pt_deep_free(p, true);
+	pt_deep_free(p2, false);
 	return 0;
 }
diff --git a/pfxtree.c b/pfxtree.c
index c295ada..0560184 100644
--- a/pfxtree.c
+++ b/pfxtree.c
@@ -61,6 +61,34 @@ pt_new()
 	return self;
 }
 
+static int
+copy(const struct pt_entry *entry, void *data)
+{
+	PrefixTree *tree = (PrefixTree *) data;
+	const char *word = entry->word;
+
+	if (entry->type == PT_TYPE_INT)
+		return pt_add(tree, word, entry->data.i);
+
+	return pt_add_p(tree, word, entry->data.p);
+}
+
+PrefixTree *
+pt_copy(const PrefixTree *src)
+{
+	PrefixTree *new = pt_new();
+	if (!new)
+		return NULL;
+
+	if (pt_foreach(src, copy, new))
+	{
+		pt_free(new);
+		return NULL;
+	}
+
+	return new;
+}
+
 void
 pt_free(PrefixTree *self)
 {
@@ -355,5 +383,5 @@ end:
 const char *
 pt_version()
 {
-	return "0.3.0";
+	return "0.4.0";
 }
diff --git a/pfxtree.h b/pfxtree.h
index 7e1614f..70d9326 100644
--- a/pfxtree.h
+++ b/pfxtree.h
@@ -102,6 +102,14 @@ typedef struct _pt_trie
 PrefixTree *
 pt_new(void);
 
+/**
+ * @brief Copies a prefix tree.
+ * @param src The prefix tree to be copied.
+ * @return The copied tree, or NULL on failure.
+ */
+PrefixTree *
+pt_copy(const PrefixTree *src);
+
 /**
  * @brief Frees an allocated prefix tree (and its child nodes).
  * @param self The tree to free.
-- 
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