1 files changed, 33 insertions, 0 deletions
diff --git a/accel-pppd/ipv6_dns.c b/accel-pppd/ipv6_dns.c
new file mode 100644
index 00000000..bb1d13f3
--- /dev/null
+++ b/accel-pppd/ipv6_dns.c
@@ -0,0 +1,33 @@
+#include <limits.h>
+
+#include "triton.h"
+#include "ipv6_dns.h"
+
+#include "memdebug.h"
+
+int __export ipv6_dns_reserve(struct ipv6_dns_t *dns, unsigned int count)
+{
+	struct in6_addr *addr;
+	unsigned int capacity;
+
+	if (count <= dns->capacity)
+		return 0;
+
+	capacity = dns->capacity;
+	if (!capacity)
+		capacity = IPV6_DNS_INITIAL_CAPACITY;
+	while (capacity < count) {
+		/* Doubling past this would wrap around and spin forever */
+		if (capacity > UINT_MAX / 2)
+			return -1;
+		capacity *= 2;
+	}
+
+	addr = _realloc(dns->addr, capacity * sizeof(*addr));
+	if (!addr)
+		return -1;
+
+	dns->addr = addr;
+	dns->capacity = capacity;
+	return 0;
+}