1 files changed, 19 insertions, 0 deletions
diff --git a/src/libs6dns/s6dns_fmt_mx.c b/src/libs6dns/s6dns_fmt_mx.c
new file mode 100644
index 0000000..aba538b
--- /dev/null
+++ b/src/libs6dns/s6dns_fmt_mx.c
@@ -0,0 +1,19 @@
+/* ISC license. */
+
+#include <skalibs/uint16.h>
+#include <skalibs/bytestr.h>
+#include <s6-dns/s6dns-message.h>
+#include <s6-dns/s6dns-fmt.h>
+
+unsigned int s6dns_fmt_mx (char *s, unsigned int max, s6dns_message_rr_mx_t const *mx)
+{
+  char fmt[UINT16_FMT] ;
+  unsigned int len = uint16_fmt(fmt, mx->preference) ;
+  unsigned int r ;
+  if (len >= max) return 0 ;
+  fmt[len++] = ' ' ;
+  r = s6dns_domain_tostring(s + len, max - len, &mx->exchange) ;
+  if (!r) return 0 ;
+  byte_copy(s, len, fmt) ;
+  return len + r ;
+}