1 files changed, 27 insertions, 0 deletions
diff --git a/libautomata_grow_automaton.c b/libautomata_grow_automaton.c
new file mode 100644
index 0000000..98ce12f
--- /dev/null
+++ b/libautomata_grow_automaton.c
@@ -0,0 +1,27 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libautomata_grow_automaton(struct libautomata_automaton *automaton, size_t n)
+{
+	struct libautomata_node *new;
+	size_t size;
+
+	if (automaton->nnodes > SIZE_MAX - n)
+		goto enomem;
+	size = automaton->nnodes + n;
+	if (size > SIZE_MAX / sizeof(*automaton->nodes))
+		goto enomem;
+	size *= sizeof(*automaton->nodes);
+
+	new = realloc(automaton->nodes, size);
+	if (!new) {
+	enomem:
+		errno = ENOMEM;
+		return -1;
+	}
+	automaton->nodes = new;
+
+	return 0;
+}