1 files changed, 21 insertions, 0 deletions
diff --git a/src/libs6dns/s6dns_domain_tostring.c b/src/libs6dns/s6dns_domain_tostring.c
new file mode 100644
index 0000000..ff72893
--- /dev/null
+++ b/src/libs6dns/s6dns_domain_tostring.c
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <s6-dns/s6dns-domain.h>
+
+unsigned int s6dns_domain_tostring (char *s, unsigned int max, s6dns_domain_t const *d)
+{
+  if ((unsigned int)d->len + 1 > max) return (errno = ENAMETOOLONG, 0) ;
+  if (!d->len || (d->s[0] != '.')) return (errno = EINVAL, 0) ;
+  if (d->len == 1)
+  {
+    s[0] = '.' ;
+    return 1 ;
+  }
+  else
+  {
+    byte_copy(s, d->len - 1, d->s + 1) ;
+    return d->len - 1 ;
+  }
+}