1 files changed, 21 insertions, 0 deletions
diff --git a/src/libs6dns/s6dns_domain_encode.c b/src/libs6dns/s6dns_domain_encode.c
new file mode 100644
index 0000000..61a790d
--- /dev/null
+++ b/src/libs6dns/s6dns_domain_encode.c
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <s6-dns/s6dns-domain.h>
+
+int s6dns_domain_encode (s6dns_domain_t *d)
+{
+  register char *s = d->s ;
+  register unsigned int len = d->len ;
+  if (!d->len || (*s != '.')) return (errno = EINVAL, 0) ;
+  while (len > 1)
+  {
+    register unsigned int n = byte_chr(s + 1, len - 1, '.') ;
+    if (n > 63) return (errno = EINVAL, 0) ;
+    *s = n++ ; s += n ; len -= n ;
+  }
+  if (!len) return (errno = EINVAL, 0) ;
+  *s = 0 ;
+  return 1 ;
+}